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Feature<br />

<strong>Automatic</strong> <strong>Train</strong> <strong>Control</strong> <strong>System</strong><br />

<strong>Development</strong> <strong>and</strong> <strong>Simulation</strong><br />

<strong>for</strong> High-Speed Railways<br />

Abstract<br />

Research <strong>and</strong> development on high-speed railway<br />

systems <strong>and</strong> particularly its automatic control<br />

systems, are introduced. Numerical modeling of<br />

high-speed trains in the Chinese high-speed train<br />

system <strong>and</strong> its associate automatic control systems<br />

are described in detail. Moreover, modeling<br />

<strong>and</strong> simulation of train operation systems are<br />

analyzed <strong>and</strong> demonstrated.<br />

Hairong Dong, Bin Ning, Baigen Cai,<br />

<strong>and</strong> Zhongsheng Hou<br />

1. Introduction<br />

Since the first-ever high-speed train, the Japanese<br />

Tokaido Shinkansen, started operation at the<br />

maximum speed of 210 km/h in 1964 [1, 2], railway<br />

systems have gone through a rapid evolution <strong>and</strong><br />

improvement with significant growths, mainly in Japan,<br />

France, Germany, Italy, Britain <strong>and</strong>, lately, China.<br />

Digital Object Identifier 10.1109/MCAS.2010.936782<br />

© DIGITAL VISION &<br />

WIKIMEDIA COMMONS<br />

6 IEEE CIRCUITS AND SYSTEMS MAGAZINE 1531-636X/10/$26.00©2010 IEEE SECOND QUARTER 2010


The world speed record today is 574.8 km/h achieved<br />

by the French TGV POS train Hunder test conditions on<br />

the railway network LGV Est, reported in 2007 [3]. Noticeably,<br />

the TGV record <strong>for</strong> the fastest scheduled rail<br />

journey with a start-to-stop average speed of 279.4 km/h<br />

was already surpassed by the Chinese CRH (China Railway<br />

High-speed) service, called Harmony Express, on<br />

the Wuhan–Guangzhou High-speed Railway in 2009.<br />

In recent years, the Chinese railway systems have<br />

gone through a massive phase of upgrading <strong>and</strong> expansion,<br />

especially after the establishment of the China <strong>Train</strong><br />

<strong>Control</strong> <strong>System</strong> (CTCS) in 2002. Since the second CTCS<br />

level-3 Zhengzhou-Xi’an High-Speed Railway being put on<br />

service with the maximum speed of 352 km/h on 6 February<br />

2010, China has scored the top mark in high-speed<br />

railway development worldwide. It is estimated that by<br />

the end of 2020, China will have 18,000 km Dedicated Passenger<br />

Lines (DPL, another name <strong>for</strong> high-speed railway<br />

in China), with an operating speed of 350 km/h, which<br />

will cover most areas of the whole country.<br />

The next-generation Chinese railway systems will<br />

face with many challenges in related technologies. The<br />

coordinated operation of the high-speed <strong>and</strong> the conventional<br />

railway systems, as well as the interoperability<br />

among DPL, rebuilt existing lines <strong>and</strong> old operation<br />

lines, all need to be carefully examined, integrated <strong>and</strong><br />

managed. These acquire products <strong>and</strong> services of highend<br />

technologies, which come along with accurate operational<br />

requirements <strong>and</strong> strict dem<strong>and</strong>s. What’s more,<br />

completing the construction of infrastructure <strong>and</strong> facility<br />

is not the end of the system development. To endure<br />

the overall system to operate properly, there must be a<br />

reliable high-level automatic control system embedded,<br />

so as to ensure the entire railway network to function<br />

safely, cost-effectively <strong>and</strong> highly efficiently. But this is<br />

never a local, low-cost <strong>and</strong> easy task.<br />

High-speed railway systems have brought up many<br />

new <strong>and</strong> challenging technical issues as well as commercial<br />

issues such as transport capacity, safety <strong>and</strong> com<strong>for</strong>t<br />

[4, 5]. Whether the railway systems can work with high<br />

security <strong>and</strong> high efficiency mainly depended on the core<br />

of the train control systems. Over the years, much ef<strong>for</strong>t<br />

has been made to study automatic train control systems<br />

[6–8], from the earlier Track-circuit Based <strong>Train</strong> <strong>Control</strong><br />

(TBTC) to the modern Communication Based <strong>Train</strong> <strong>Control</strong><br />

(CBTC) systems [9–11]. In the long past, conventional<br />

trains in China were manually controlled <strong>and</strong> operated by<br />

drivers based on trackside interlocking <strong>and</strong> blocking, in<br />

conjunction with various train signaling <strong>and</strong> surveillance<br />

devices, as well as human experience <strong>and</strong> skills. As the<br />

high-speed railway systems being rapidly developed in<br />

China recently, the old TBTC system has gradually been<br />

phased out, <strong>and</strong> replaced by the modern <strong>Train</strong> <strong>Control</strong><br />

<strong>System</strong> (TCS), which has been built, tested <strong>and</strong> partially<br />

put in operation. TCS is a train protection system especially<br />

designed <strong>for</strong> high-speed railways, ensuring safe<br />

<strong>and</strong> smooth operations [12, 13]. The main advantages of<br />

ATC include making possible use of automatic signaling<br />

instead of trackside signaling, <strong>and</strong> possible use of smooth<br />

deceleration patterns in lieu of the rigid <strong>and</strong> rough stops<br />

encountered by the old train stopping technology.<br />

During the operation of a train, the vehicle dynamics<br />

are quite complicated, involving such as starting, traction,<br />

coasting, speeding, braking, <strong>and</strong> stopping, not to<br />

mention the complex states under different loading <strong>and</strong><br />

weather conditions. There<strong>for</strong>e, accurately modeling the<br />

train dynamics is by no means an easy task. The earlier<br />

single-particle model of a train ignored the length of the<br />

train <strong>and</strong> the reactions between two train compartments,<br />

hence was quite far apart from the real physical train mechanics<br />

<strong>and</strong> dynamics. Starting from the 1980s, by considering<br />

a multi-particle rigid-body model, namely, by taking<br />

into account the reaction <strong>for</strong>ces between compartments,<br />

a general multi-compartment train model is considered<br />

more realistic. But this was at the price of computational<br />

complexity. For instance, in [17], a train with seven compartments<br />

was modeled by a set of totally 84 differential<br />

equations. When coming to high-speed trains, the situation<br />

is more complicated <strong>and</strong> even intractable: the train<br />

as a whole is a time-varying high-dimensional nonlinear<br />

dynamical system with rich <strong>and</strong> complex dynamical behaviors.<br />

As a result, accurate dynamical analysis of the<br />

train model becomes the first step-stone towards highspeed<br />

rail train systems control <strong>and</strong> operation.<br />

Whether or not a railway system can be operated<br />

safely <strong>and</strong> efficiently depends essentially on the per<strong>for</strong>mance<br />

of its <strong>Automatic</strong> <strong>Train</strong> <strong>Control</strong> (ATC) system.<br />

The train coasting system, in particular, utilizes real-time<br />

road in<strong>for</strong>mation <strong>and</strong> online environmental data in combination<br />

with onboard references to achieve optimal control<br />

of the train traction <strong>and</strong> braking while keeping travel<br />

schedule on-time, reducing electric-energy consumption,<br />

<strong>and</strong> maintaining the journey com<strong>for</strong>t <strong>for</strong> passengers.<br />

Generally, in urban rail systems the ATC system includes<br />

<strong>Automatic</strong> <strong>Train</strong> Protection (ATP), <strong>Automatic</strong><br />

<strong>Train</strong> Operation (ATO) <strong>and</strong> <strong>Automatic</strong> <strong>Train</strong> Supervision<br />

(ATS), as shown in Fig. 1 [14–15].<br />

In Fig. 1, ATO is responsible <strong>for</strong> all the traction <strong>and</strong><br />

braking controls, as well as parking <strong>and</strong> stopping operations,<br />

as further illustrated by Fig. 2 [16, 28]. There<strong>for</strong>e,<br />

Hairong Dong, Bin Ning, Baigen Cai, <strong>and</strong> Zhongsheng Hou are with Beijing Jiaotong University, Beijing 100044, P. R. China. E-mail: hrdong@bjtu.edu.cn.<br />

SECOND QUARTER 2010 IEEE CIRCUITS AND SYSTEMS MAGAZINE 7


ATO is a key to, <strong>and</strong> has a direct impact on, the development<br />

of the train operation systems <strong>and</strong> automatic train<br />

control systems.<br />

Facing with such real-time multi-objective dynamic<br />

operational requirements, intelligent control strategies<br />

came into play in the 1980s. PID control, genetic algorithms<br />

[18, 19], fuzzy logic [20, 21], expert systems [22], <strong>and</strong><br />

artificial neural networks [23, 24] were suggested <strong>and</strong><br />

applied to vehicle optimal control, energy-consumption<br />

planning, precise parking, <strong>and</strong> accurate locomotive trajectory<br />

tracking [25]. More recently, iterative learning<br />

control <strong>and</strong> hybrid control approaches have received<br />

increasing interest [26–28]. As Electric Multiple Units<br />

(EMU) become more <strong>and</strong> more popular, data-based<br />

simulations <strong>and</strong> ATO algorithms <strong>for</strong> high-speed trains<br />

also attract more <strong>and</strong> more attention [29, 30].<br />

Traction Service<br />

Brake<br />

Figure 1. Structure of automatic train control system.<br />

Speed<br />

Station Plat<strong>for</strong>m<br />

With the rapid expansion of the nationwide metropolitan populations,<br />

the Chinese government has a strong desire to improve the<br />

urban railway loading capacity.<br />

Emergency<br />

Brake<br />

ATS<br />

Ground <strong>Control</strong><br />

ATP Limiting Speed<br />

<strong>Train</strong> Speed<br />

Speed Adjustment<br />

Point<br />

Tractor Cab<br />

ATP<br />

ATP<br />

Stopping<br />

Point<br />

Figure 2. Operation of the ATO system.<br />

ATO<br />

ATO<br />

Speed Adjustment<br />

Distance<br />

Position Stall<br />

Loop<br />

The CBTC-based ATC system adopts a Moving Blocking<br />

(MB) principle, which appears to be a future direction<br />

of automatic train control systems <strong>for</strong> high-speed<br />

trains. In fact, it has been implemented in some urban<br />

railway systems in China. Following the rapid development<br />

of a new-generation of wireless communication<br />

systems <strong>and</strong> technologies, the traditional Fixed Blocking<br />

(FB) devices will eventually be replaced by MB devices,<br />

which will thereby dominate most train ATC systems<br />

in the near future. Thus, it is a new challenge to<br />

develop a train operation <strong>and</strong> tracking model that can<br />

well describe the moving <strong>and</strong> tracking mechanisms of<br />

train operation in fast mode [31, 32]. This will effectively<br />

improve the railway system’s safety, efficiency <strong>and</strong><br />

economic impacts.<br />

With the rapid expansion of the nationwide metropolitan<br />

populations, the Chinese government has a strong<br />

desire to improve the urban railway loading capacity.<br />

As mentioned above, the operation of a train is a very<br />

complex process which involves complicated motion<br />

dynamics such as starting, traction, coasting, speeding,<br />

braking, parking <strong>and</strong> stopping, under different loading<br />

<strong>and</strong> weather conditions. It is very desirable to establish<br />

a train operation simulation plat<strong>for</strong>m <strong>for</strong> design, testing<br />

<strong>and</strong> verification purposes, to carry out various traffic<br />

experiments under time-varying, complex <strong>and</strong> uncertain<br />

environmental conditions. This plat<strong>for</strong>m can effectively<br />

improve railway systems’ theoretical design <strong>and</strong> computer<br />

simulation be<strong>for</strong>e road testing <strong>and</strong> onside operations.<br />

Today, several rail system simulators <strong>and</strong> train-traction<br />

computational plat<strong>for</strong>ms have been built <strong>and</strong> put in use<br />

[33]. British Rail Research Division, <strong>for</strong> example, had<br />

designed GATTS in 1970, evolved to the so-called VISION<br />

<strong>and</strong> OSLO simulators afterwards, which are improved<br />

versions that take full advantage of modem computing<br />

technology. Other typical simulation systems include the<br />

RAILSIM <strong>Train</strong> Per<strong>for</strong>mance Calculator (TPC) systems<br />

<strong>and</strong> the <strong>Train</strong>STAR in USA, UTRAS in Japan, etc. These<br />

systems can carry out various train operation computations,<br />

delay <strong>and</strong> resumption analysis, signaling effect <strong>and</strong><br />

prediction, <strong>and</strong> train capacity evaluation, among others.<br />

Noticeably, various high-per<strong>for</strong>mance train control<br />

simulation systems are under rapid development in<br />

China, which are generally designed to suit the characteristics<br />

<strong>and</strong> conditions of the Chinese developing highspeed<br />

railway systems <strong>and</strong> environments [34, 35, 77], as<br />

further discussed below.<br />

8 IEEE CIRCUITS AND SYSTEMS MAGAZINE SECOND QUARTER 2010


2. Numerical Modeling of High-Speed <strong>Train</strong>s<br />

A high-speed railway system is a typical complex<br />

dynamical system with large time-delays, high nonlinearity<br />

<strong>and</strong> multi-objectives, which is typically working<br />

under time-varying <strong>and</strong> uncertain conditions on<br />

such parameters as traction power supplies, different<br />

types of signals, speed restrictions, train tractions<br />

<strong>and</strong> braking, etc. It has many complicated nonlinear<br />

dynamical phenomena observed, including stochastic<br />

mechanical vibrations, micro-pressure fluid dynamics,<br />

sound explosion (sonic booms), fluctuating dynamical<br />

characteristics, <strong>and</strong> so on.<br />

In real operations, different situations imply different<br />

control dem<strong>and</strong>s <strong>for</strong> different purposes, while the main<br />

objectives are always on-time scheduling, high-speed<br />

motion, full-load <strong>and</strong> safe operation of the trains. Several<br />

important factors have to be taken into account,<br />

especially rail conditions, vehicle specifications, operational<br />

strategies, riding com<strong>for</strong>t of passengers, <strong>and</strong><br />

energy consumption. Here, rail conditions include the<br />

distance between plat<strong>for</strong>ms, gradients, train parking<br />

<strong>and</strong> stopping points, <strong>and</strong> the dwelling time durations.<br />

Vehicle conditions include resistance driving, traction<br />

<strong>and</strong> braking effects, as well as specifications of the train<br />

set. Driving conditions, moreover, refer to the all-out<br />

driving mode, coasting driving mode, <strong>and</strong> speed restrictions.<br />

All things considered, there<strong>for</strong>e, it is generally<br />

very challenging to automatically control a train satisfactorily.<br />

Nevertheless, over the years, a great deal of<br />

ef<strong>for</strong>t has been made to underst<strong>and</strong> <strong>and</strong> analyze most<br />

characteristics of such a complex dynamical system<br />

towards automation, <strong>and</strong> many insightful <strong>and</strong> useful results<br />

have been obtained.<br />

In the following, a specific numerical model of automatic<br />

train control is briefly discussed, which can describe<br />

many of the a<strong>for</strong>e-mentioned characteristics <strong>and</strong><br />

dynamical features of a high-speed train, <strong>and</strong> is suitable<br />

<strong>for</strong> control design.<br />

As mentioned, the high-speed train operation is very<br />

complicated <strong>and</strong> complex. A common practice is to per<strong>for</strong>m<br />

numerical modeling based on the basic traction<br />

dynamics theory verified by using a large amount of real<br />

experimental data. Theoretically, the train operation<br />

function consists of three types of operation modes:<br />

traction mode, braking mode, <strong>and</strong> coasting mode. Taking<br />

into account the relations between these operation<br />

modes <strong>and</strong> the train motions, numerical modeling of a<br />

general high-speed train has been carried out, which<br />

enables the designer to compute the train speeds, traveling<br />

times, energy consumption, braking <strong>and</strong> stopping<br />

per<strong>for</strong>mances, <strong>and</strong> train operation <strong>for</strong>ces, thereby suggesting<br />

correct parameter values <strong>and</strong> effective operations.<br />

With a good numerical model, the designer can<br />

study the motion stability, train operation, <strong>and</strong> emergency<br />

braking, <strong>and</strong> can optimize the train speeds, loading<br />

capacity <strong>and</strong> energy consumption, etc.<br />

There are many important issues to be considered in<br />

high-speed train modeling. When a high-speed train with<br />

initial speed 250–300 km/h is being stopped at emergency,<br />

it requires a high deceleration <strong>and</strong> consumes a large<br />

amount of power [36, 37]. For example, to stop the TGV-A<br />

train at the initial speed of 300 km/h requires an average<br />

of 1.0 m/s 2 deceleration change rate. For the <strong>for</strong>thcoming<br />

Beijing-Shanghai high-speed line, simulations have<br />

shown that using an air brake system to stop a train at<br />

initial speed of 300 km/h, it will take 4.1 km <strong>for</strong> the train<br />

to arrive at a complete stop, which will be 6.5 km if the<br />

initial speed is 350 km/h <strong>and</strong> 8.5 km if 380 km/h. <strong>Simulation</strong>s<br />

have also shown that the total resistance, which<br />

the Beijing-Shanghai high-speed train will face with, is<br />

about 84% of the total that two CRH2-300 high-speed<br />

trains will normally encounter. This critical issue has a<br />

direct impact on the commercial capacity, design, construction<br />

<strong>and</strong> operation of high-speed trains <strong>and</strong> their<br />

associate railways, there<strong>for</strong>e must be taken into serious<br />

consideration in system modeling <strong>and</strong> analysis.<br />

In 1970, a comprehensive <strong>and</strong> manageable multi-particle<br />

train model was established by the American Railway<br />

Engineering Association [38]. In that model, in the<br />

traction mode the train is accelerated <strong>for</strong> propulsion <strong>and</strong><br />

decelerated <strong>for</strong> braking. The train’s inertia is also used<br />

as a track condition <strong>and</strong> the train speed is incorporated<br />

in the coasting mode. The actual measurement data<br />

about the train traction-braking curve <strong>and</strong> resistance<br />

characteristic curve are used to analyze the running<br />

<strong>for</strong>ces, which turns out to be quite different from the<br />

current running conditions of the conventional trains.<br />

Five kinds of CRH traction characteristic curves are<br />

illustrated by Fig. 3 [36, 37]. The intrinsic dynamics <strong>for</strong><br />

the high-speed ATO system based on multi-running conditions<br />

is described by<br />

Q 2 Cv 1v2 2Ks 1 v<br />

Fh 5 •<br />

| 2v $j2 1traction : F1v2 5Q2<br />

2Cv1v2 2Ks 12j, v | 2v ,j2 1coasting : F 1v2 502<br />

2Cv1v2 2Ks2Fz 1v2 1v | 2v #2j21braking : F1v2 52Fz2. Here, v is the desired speed; v | is the actual speed; j is<br />

acceptable error between actual <strong>and</strong> desired speeds; v is<br />

the basic resistance; Q is the traction which is a function<br />

of speed <strong>and</strong> gear <strong>for</strong>ce determined by the type of train;<br />

F1v2 is the motion <strong>for</strong>ce exerted from the train; F z 1v2 is<br />

the braking <strong>for</strong>ce; C is a train weight constant; s is the<br />

driving distance; K is the track stiffness coefficient.<br />

It can be seen from Fig. 3 that the train speed is determined<br />

mainly by the train traction <strong>and</strong> braking <strong>for</strong>ces,<br />

as well as the train motion <strong>and</strong> other resistances.<br />

SECOND QUARTER 2010 IEEE CIRCUITS AND SYSTEMS MAGAZINE 9


EMU Traction (kN), Resistance (kN)<br />

320<br />

300<br />

280<br />

260<br />

240<br />

220<br />

200<br />

180<br />

160<br />

140<br />

120<br />

100<br />

80<br />

60<br />

40<br />

20 0<br />

CRH2-300<br />

Traction<br />

CRH2 Traction<br />

CRH1 Traction<br />

CRH5 Traction<br />

0 20406080100120140160180200220240260280300320340<br />

CRH3 Traction<br />

CRH1 Resistance<br />

CRH5 Resistance<br />

CRH1 Resistance<br />

<strong>Train</strong> Speed (km · h –1 )<br />

CRH1 Traction/kN CRH1 Resistance/kN<br />

CRH2 Traction/kN CRH2 Resistance/kN<br />

CRH2-300 Traction/kN CRH2-300 Resistance/kN<br />

CRH5 Traction/kN CRH5 Resistance/kN<br />

CRH3 Traction/kN CRH3 Resistance/kN<br />

Figure 3. CRH traction characteristic curves.<br />

CRH2-300<br />

Resistance<br />

CRH3<br />

Resistance<br />

High-speed train traction characteristic curves are<br />

linearly fitting curves described according to the actual<br />

running conditions, used to represent the relationship<br />

between speed <strong>and</strong> traction of the train [42]. They are<br />

used to derive the governing equations of motion of the<br />

high-speed ATO systems. Denote by 1v 1, F 1 2 <strong>and</strong> 1v 2, F 2 2<br />

two known points on the traction characteristic curve,<br />

by 1v x, F x 2 a point between 1v 1, F 1 2 <strong>and</strong> 1v 2, F 2 2, where F<br />

represents the <strong>for</strong>ce. Using a typical linear interpolation,<br />

the <strong>for</strong>mula of traction is obtained as<br />

Fx 5 F1 1 1vx 2 v121F2 2 F12 . (2)<br />

v2 2 v1 During the train operation, this <strong>for</strong>mula of traction is affected<br />

not only by the wheel-rail coupling, pantograph <strong>and</strong><br />

catenary, but also by the fluid-solid coupling resistance<br />

existing through the coasting operation. The total resistance<br />

experienced by the train comes from all fronts: steel<br />

rails, bow net <strong>and</strong> the air. It is quite difficult to derive an<br />

accurate <strong>for</strong>mula or equation to precisely describe such<br />

compound resistance characteristic of a high-speed train.<br />

In the earlier 1900s, Schmidt <strong>and</strong> Dunn proposed a<br />

sensible train-resistance model [40, 41], based on which<br />

Davis derived a now-famous train-resistance computational<br />

<strong>for</strong>mula in 1926 [42]. Thereafter, the American<br />

Railways Engineering Association developed a comprehensive<br />

model in 1970, which can well describe the<br />

train motion characteristics [38]. Then, in 1982, a more<br />

realistic train-resistance model was proposed [43],<br />

which is still being used <strong>for</strong> computations <strong>and</strong> simulations<br />

today:<br />

v 1v2 5 a 1 bv 1 cv2<br />

e<br />

g1s2 5 lsin1u 1s2.<br />

10 IEEE CIRCUITS AND SYSTEMS MAGAZINE SECOND QUARTER 2010<br />

(3)<br />

Here, a, b <strong>and</strong> c are constants of the Locomotive<br />

type, determined empirically from real data; g1s2 is the<br />

resistance <strong>for</strong>ce in special sections of the railway such<br />

as ramps, curves <strong>and</strong> tunnels; u 1s2 is the slope at position<br />

s, referred to as gradient l is the additive slope.<br />

When the train achieving speeds of well over 200 km/h,<br />

especially achieving speeds of over 300 km/h, the running<br />

resistance mainly depends on the third parameter,<br />

c, in Davis’ <strong>for</strong>mula.<br />

The train braking system plays a key role in safe<br />

operations of high-speed trains. Resistance <strong>for</strong>ce of<br />

a high-speed train under the condition of braking includes<br />

running resistance as well as regenerative braking,<br />

friction braking, <strong>and</strong> air braking <strong>for</strong>ces. Thus, a<br />

good braking system model incorporating such <strong>for</strong>ces is<br />

needed in order to meet various crucial per<strong>for</strong>mance requirements<br />

of the high-speed trains. In train modeling,<br />

energy consumption <strong>and</strong> passengers com<strong>for</strong>t are also<br />

important factors to be accounted <strong>for</strong>.<br />

In general, energy is supplied to a train by means<br />

of electricity or via combustion of diesel. The traction<br />

system in a train may convert such energy sources to<br />

mechanical energy. On the other h<strong>and</strong>, the energy used<br />

<strong>for</strong> regenerative braking may be converted into electric<br />

energy <strong>and</strong> be fed back to the pantograph <strong>and</strong> catenary,<br />

thus energy saving benefit is apparent.<br />

For commercial high-speed trains, passengers’ ride<br />

com<strong>for</strong>t against lateral mechanical oscillations has been<br />

a main concern, which actually has been discussed <strong>for</strong><br />

a long time. Much research <strong>and</strong> development on train<br />

dynamics <strong>and</strong> improving human com<strong>for</strong>t have been conducted,<br />

by applying various control methods. A creep<br />

<strong>for</strong>ce <strong>for</strong> dynamic analysis of the wheel-rail tangential<br />

<strong>for</strong>ce of a high-speed train was derived in [44], aiming<br />

to improve running stability <strong>and</strong> ride com<strong>for</strong>t. A modelbased<br />

predictive control technique from a mixed H 2/Hinfinity<br />

control approach was suggested in [45] <strong>for</strong> active<br />

vibration control of a railway vehicle. Relationships between<br />

model parameters, physical parameters <strong>and</strong> ride<br />

quality are built within a unified “track-vehicle-human”<br />

model, which was verified experimentally by identifying<br />

both model parameters <strong>and</strong> responses. Moreover, power<br />

spectral densities were used to find ways to improve<br />

the ride com<strong>for</strong>t in [46].<br />

A three-trailer train dynamic model was set up in<br />

[47], taking into consideration the effects of coupling<br />

stiffness <strong>and</strong> the damping coefficient in the concern of<br />

the passengers ride com<strong>for</strong>t. Lateral dampers mounted<br />

in between compartments can improve the lateral ride<br />

com<strong>for</strong>t effectively <strong>and</strong> can also improve the vertical


ide com<strong>for</strong>t to some extent [48]. A three-dimensional<br />

coupled dynamic model <strong>for</strong> motor cars <strong>and</strong> trailers was<br />

also suggested, based on the system dynamics of rigid<br />

bodies, in [49]. During the modeling process, various<br />

nonlinear factors have to be considered, including nonlinear<br />

wheel-rail contact geometry, nonlinear wheel-rail<br />

creep <strong>for</strong>ce <strong>and</strong> creepage, nonlinear <strong>for</strong>ce <strong>for</strong> couplers,<br />

nonlinear secondary suspension <strong>for</strong>ce, etc. It was shown<br />

that the lateral ride quality of the head compartment<br />

<strong>and</strong> the end compartment are generally worse than the<br />

middle ones [50].<br />

Future train design is envisaged to be more cost-effective<br />

<strong>and</strong> more energy-efficient, with faster speed introduced<br />

<strong>and</strong> lighter bodies built. In recently years, different<br />

kinds of high-speed trains <strong>and</strong> their modeling have been<br />

carefully studied. One way to maximize the train speed<br />

is to use the existing infrastructure with the introduction<br />

of tilting trains. A tilting train is a train that could reduce<br />

the passenger lateral acceleration by leaning the train<br />

compartments inward on curves, which thereby enables<br />

higher train speeds. This idea attracts quite some interest<br />

<strong>for</strong> improving the regional express trains in Europe.<br />

Reduced-order robust controllers <strong>for</strong> tilting trains were<br />

proposed to improve the curving per<strong>for</strong>mance of highspeed<br />

trains. Linear quadratic Gaussian (LQG) control<br />

with loop transfer recovery was already applied to active<br />

suspension designs, where model reduction on high-order<br />

controllers were used to achieve desirable closedloop<br />

per<strong>for</strong>mances [51]. In order to study the dynamical<br />

behaviors of tilting trains with low computational costs,<br />

the basic mechanisms of the tilting train were described<br />

by some constrained equations. Simplified models were<br />

then proposed to account <strong>for</strong> the dynamical couplings<br />

between compartments subjected to the articulated<br />

configuration of the Talgo trains [52]. PID-fuzzy-logic<br />

multi-objective tuning approach was also proposed <strong>for</strong><br />

improving the per<strong>for</strong>mance of tilting trains in [53]. Since<br />

building new high-speed railways is a very expensive<br />

mission, tilting trains are being seriously considered by<br />

many inl<strong>and</strong> cities in western China.<br />

Numerical modeling of high-speed trains is useful not<br />

only <strong>for</strong> train’s ride control but also <strong>for</strong> ATC analysis, as<br />

further discussed below.<br />

3. <strong>Automatic</strong> <strong>Train</strong> <strong>Control</strong> <strong>System</strong>s<br />

The train control system requires two sets of data to<br />

execute accurate train operation. One set is static data,<br />

such as rail parameters, locomotive traction <strong>for</strong>ce <strong>and</strong><br />

braking capabilities, etc., which is closely related to the<br />

train model. Another is dynamic, such as train position,<br />

speed, <strong>and</strong> motion states. It is a key mission to obtain<br />

<strong>and</strong> provide the train control system with these two sets<br />

of data in real time.<br />

The train control system is the core of the entire<br />

framework of both numerical model <strong>and</strong> physical plat<strong>for</strong>m.<br />

The train control system is to continuously supervise,<br />

control <strong>and</strong> adjust the train operations, ensuring<br />

the train to operate safely at all times. It provides safe<br />

motion authority directly to the driver through cab-display<br />

<strong>and</strong> it continuously monitors the driver’s actions.<br />

With the increase of train speeds in railway systems,<br />

various railway technologies have seen significant<br />

changes <strong>and</strong> improvements. The China <strong>Train</strong> <strong>Control</strong><br />

<strong>System</strong> (CTCS) is a train control system implemented<br />

since 2002, which is specified <strong>for</strong> compliance with the<br />

high-speed <strong>and</strong> the conventional interoperability <strong>and</strong><br />

directives. The system has in effect remedied the current<br />

lack of st<strong>and</strong>ardization in signaling <strong>and</strong> control,<br />

which constitutes one of the few major obstacles to the<br />

development of high-speed rail traffic in China.<br />

CTCS by nature is an automatic train protection system,<br />

based on cab-signaling <strong>and</strong> signal aspects as well<br />

as continuous tracking to the data transmission on the<br />

train system. The movement authority (MA) <strong>and</strong> the corresponding<br />

line in<strong>for</strong>mation are transmitted to the control<br />

unit of the train <strong>and</strong> then being displayed in the cab<br />

<strong>for</strong> the driver as comm<strong>and</strong>s or references. A train with<br />

complete CTCS equipment <strong>and</strong> functionality can operate<br />

on any CTCS line without much technical restriction.<br />

CTCS has several levels, namely CTCS level-0, 1, 2, 3 <strong>and</strong><br />

4. The definition of the levels depends on how the line<br />

is equipped <strong>and</strong> the way the in<strong>for</strong>mation is transmitted<br />

to the train. Interoperability is necessary <strong>for</strong> the train<br />

control system to achieve joint operation among DPL<br />

<strong>and</strong> rebuilt lines, where CTCS levels-2, 3 <strong>and</strong> 4 are backcompatible<br />

with lower levels.<br />

CTCS level-3 in China was firstly used on the Wuhan-<br />

Guangzhou High-speed Railway services, where trains<br />

have speeds up to 350 km/h on DPL, which was started<br />

operation in December 2009. It has two subsystems:<br />

ground subsystem <strong>and</strong> onboard subsystem. The ground<br />

subsystem includes balises, track circuits, a wireless<br />

communication network (GSM-R), <strong>and</strong> a Radio Block<br />

Centers (RBCs). The onboard subsystem, on the other<br />

h<strong>and</strong>, includes onboard devices <strong>and</strong> an onboard wireless<br />

module, as shown in Fig. 4 [37].<br />

CTCS level-3 is functionally similar to the European<br />

<strong>Train</strong> <strong>Control</strong> <strong>System</strong> (ETCS) level-2, used by the European<br />

Commission <strong>for</strong> trains all over Europe in 1996. The<br />

CTCS level-3, however, is designed to suit the cross-line<br />

transport commercial requirements imposed in China,<br />

which contains CTCS level-2 as back-up <strong>for</strong> CTCS level-3.<br />

Different trains in operation under the control of CTCS<br />

level-3 is illustrated in Fig. 5 [37]. When RBC or the wireless<br />

communication system has faults or failures, CTCS<br />

level-3 will be switched to CTCS level-2 automatically,<br />

SECOND QUARTER 2010 IEEE CIRCUITS AND SYSTEMS MAGAZINE 11


VC (Including<br />

CTCS–2/CTCS–3<br />

<strong>Control</strong> Logic) TCR Driver–Machine<br />

Interface (DMI)<br />

Tachometer Balise<br />

Figure 4. Structure of CTCS level-3.<br />

Radio Transmission<br />

Module<br />

as shown by Fig. 6 [37]. This allows other vehicles to<br />

enter high-speed railways if needed, thereby increasing<br />

the utilization of the system. In contrast, ETCS does<br />

not have such a back-up, there<strong>for</strong>e has to stop services<br />

whenever troubles <strong>and</strong> problems arise. Moreover, CTCS<br />

level-3 has track circuits, used to check the train occupation<br />

<strong>and</strong> safety. It also has ground balises, used to adjust<br />

the position calibration <strong>and</strong> motion directions. They can<br />

be switched in between CTCS level-2 <strong>and</strong> CTCS level-3,<br />

while ETCS-2 does not have such equipments either.<br />

Automation control of high-speed trains is executed<br />

by ATP: according to the travel scheduling <strong>and</strong><br />

CTCS Level-2 Line<br />

CTCS Level-2<br />

CTCS Level-3<br />

ATP Equipment<br />

of CRH<br />

Track<br />

Circuit<br />

Transmission<br />

Module (BTM)<br />

Receiver<br />

GSM-R<br />

GSM-R<br />

Enchange Center<br />

Radar Sensor<br />

CTCS Level-3<br />

CTCS Level-2<br />

comm<strong>and</strong>s, traveling lines, <strong>and</strong> the train states, ATP<br />

computes the speed limits <strong>for</strong> the train. The CTCS level-3<br />

onboard devices will then link all such speed restriction<br />

profi les together so as to arrive at a distanceto-go<br />

speed control mode, as shown in Fig. 7 [37], which<br />

utilizes the reading data from the Balise along the line.<br />

CTCS level-3 adopts ATP with High Priority <strong>and</strong><br />

Driver-Priority mode <strong>for</strong> train operation. The socalled<br />

ATP with High Priority mode refers to an automatic<br />

control mechanism which follows a predesigned<br />

speed-control profile in accordance with the real descending<br />

or stopping motion of the train, as shown in<br />

Fig. 8. CTCS level-3 adopts ATP<br />

with High Priority mode in Full<br />

Supervision mode, while useing<br />

Driver-Priority mode in Partial<br />

Supervision mode.<br />

As mentioned above, the ATO<br />

system is one important part of<br />

the ATC system, which can replace<br />

the driver to operate the<br />

train while ensuring the train to<br />

run efficiently. The most important<br />

function of the ATO system is<br />

speed adjustment. Based on differ-<br />

Balise<br />

ent blocking modes, the train operation<br />

system has different speed<br />

control curves. It can be easily<br />

imagine that the distance-to-go<br />

12 IEEE CIRCUITS AND SYSTEMS MAGAZINE SECOND QUARTER 2010<br />

TCC<br />

CTCS Level-3 Line<br />

Block<br />

Figure 5. Different trains in operation under the control of CTCS level-3.<br />

Radio<br />

Block Center<br />

LEU<br />

Balise<br />

TSR<br />

Server<br />

CTC<br />

ZPW-2000<br />

Track<br />

Circuit<br />

Computer-Based<br />

Interlocking


300–350 km/h Line<br />

CTCS-3 Area<br />

Balise<br />

200–250 km/h Line<br />

CTCS-2 Area<br />

ZPW2000<br />

Track Circuit<br />

In<strong>for</strong>mation Code<br />

L5<br />

200–250 km/h Line<br />

CTCS-2 Area<br />

Switching<br />

Point<br />

L5 L5 L4 L3<br />

Warning<br />

Point<br />

(Forward)<br />

(a)<br />

Warning<br />

Point<br />

(Backward)<br />

ZPW2000<br />

Track Circuit<br />

In<strong>for</strong>mation Code<br />

Warning<br />

Point<br />

(Forward)<br />

(b)<br />

300–350 km/h Line<br />

CTCS-3 Area<br />

Switching<br />

Point<br />

Figure 6. Transition between CTCS level-3 <strong>and</strong> CTCS level-2.<br />

(a) Transition CTCS level-2 to CTCS level-3. (b) Transition<br />

CTCS level-3 to CTCS level-2.<br />

speed control mode has the shortest braking distance<br />

in general.<br />

The study of high-speed ATO systems is of great importance,<br />

<strong>and</strong> many good ATO algorithms have been<br />

proposed <strong>and</strong> implemented in recent years, including <strong>for</strong><br />

instance PID control, fuzzy-logic control, expert-system<br />

control <strong>and</strong> neural-network control, among others. PID<br />

control algorithms were first developed <strong>and</strong> applied into<br />

the ATO system <strong>for</strong> its precision on the London Tube<br />

in 1968. A fuzzy ATO controller was designed <strong>and</strong> recommended,<br />

which can automatically change the train<br />

operation mode to offset un<strong>for</strong>eseen deviations caused<br />

by various factors [55]; it can actually control the train’s<br />

departure, speed regulation, <strong>and</strong> station-stop time at a<br />

target point. Expert systems with artificial neural network<br />

were also suggested to train control systems [20].<br />

Moreover, predictive fuzzy controller selects the most<br />

likely control comm<strong>and</strong> based on a prediction of control<br />

result <strong>and</strong> its control accuracy, train safety <strong>and</strong><br />

passengers ride quality, which was shown to somewhat<br />

outper<strong>for</strong>m the traditional PID control methods [23]. A<br />

genetic algorithm was applied to automatic train operations,<br />

which can find the best idling point that meets the<br />

L5<br />

Warning<br />

Point<br />

(Backward)<br />

L4<br />

L3<br />

Balise<br />

Figure 7. Distance-to-go speed control mode.<br />

energy efficiency st<strong>and</strong>ards [56]. Predictive fuzzy logic<br />

was explored in [57] <strong>for</strong> the ATO system to accurately<br />

track the automatic stopping curves. However, most of<br />

the above-mentioned research works were concerned<br />

SECOND QUARTER 2010 IEEE CIRCUITS AND SYSTEMS MAGAZINE 13<br />

Speed<br />

EB<br />

B7N<br />

B4N<br />

B1N<br />

Poor<br />

Braking Curve<br />

Speed<br />

Brake<br />

Key of Ease<br />

Speed<br />

EBP<br />

NBP<br />

WSPREL<br />

EBP<br />

NBP<br />

WSPREL<br />

S1 + S2 S3 S4<br />

Actual Speed<br />

Actual Speed<br />

Good<br />

Braking Curve<br />

Target<br />

Speed<br />

S<br />

Equipment<br />

Monitoring Curve<br />

Distance<br />

Distance<br />

Distance<br />

Figure 8. ATP with high priority mode. (a) Emergency<br />

braking mode. (b) Service brake.<br />

(a)<br />

(b)


with the ATO system only <strong>for</strong> traditional trains. Recently,<br />

<strong>for</strong> high-speed trains, a highly effective integrated ATO<br />

control algorithm has become a research focus.<br />

Energy-saving is another main concern <strong>for</strong> the<br />

high-speed train systems. In this regard, a genetic algorithm<br />

was used in [18] to simulate the ATO, which<br />

could suggest the best coasting point be<strong>for</strong>e the train<br />

starts according to different running situations, <strong>and</strong><br />

differential evolution algorithm was applied to study<br />

the energy-saving issue in the train operation system.<br />

New directions of research on the ATO system were<br />

discussed in [58].<br />

Noticeably, however, there has not been a systematic<br />

study on various control algorithms <strong>for</strong> the ATO systems<br />

in China to date, which is urgently needed. The Chinese<br />

railway research <strong>and</strong> services have been making great<br />

ef<strong>for</strong>ts to develop better intelligent control algorithms<br />

aiming at satisfying high-efficient, energy-saving, timeaccurate,<br />

safe <strong>and</strong> com<strong>for</strong>t requirements, including<br />

modern control techniques such as multi-layer fuzzyneural-network<br />

control <strong>and</strong> other approaches [60].<br />

Today’s CBTC system is a new-generation integrated<br />

control system <strong>for</strong> high-speed trains, where the method<br />

of determining the location of a CBTC train is to examine<br />

the CBTC train (or vehicle) itself, to determine its<br />

location, direction, <strong>and</strong> speed, <strong>and</strong> then report such in<strong>for</strong>mation<br />

to wayside equipments <strong>for</strong> coordination. The<br />

goal of the CBTC system is to realize closed-loop control<br />

onboard, <strong>for</strong> both fixed blocking <strong>and</strong> moving blocking<br />

devices, <strong>and</strong> to enhance the comprehensive transport<br />

capacity of the railway system.<br />

<strong>Train</strong> operation simulation systems have been developed<br />

to meet the need of the CBTC system research, as<br />

further discussed below.<br />

4. <strong>Train</strong> Operation <strong>Simulation</strong> <strong>System</strong><br />

Today, there are more than ten countries <strong>and</strong> regions<br />

with commercial high-speed railways in operation,<br />

totaling more than ten thous<strong>and</strong> kilometers of railways<br />

worldwide.<br />

High-speed railways have been on the national plans<br />

of construction in many countries <strong>for</strong> their fast <strong>and</strong><br />

large volume of transportation, energy-saving economic<br />

impacts, <strong>and</strong> safe <strong>and</strong> com<strong>for</strong>t services. Still, how to<br />

further improve the efficiency <strong>and</strong> safety of high-speed<br />

railways is a commonly concerned problem.<br />

As discussed above, high-speed train motion <strong>and</strong> operation<br />

is a complicated <strong>and</strong> complex system <strong>and</strong> process,<br />

involving locomotive dynamics, communications<br />

<strong>and</strong> signaling, rail tracks, etc., <strong>for</strong> which simulation systems<br />

provide a practical plat<strong>for</strong>m <strong>for</strong> design, testing <strong>and</strong><br />

analysis. Due to the high complexity <strong>and</strong> diversity of<br />

automatic train control systems, good computer-based<br />

simulation tools, <strong>for</strong> evaluation of the effectiveness of<br />

new protocols <strong>and</strong> the feasibility of new applications,<br />

are of great importance. Initial research on rail vehicle<br />

dynamics simulation had processed towards better underst<strong>and</strong>ing<br />

of the stability, curving behavior <strong>and</strong> ride<br />

quality of high-speed trains. Much testing <strong>and</strong> validation<br />

experiences are now used as an essential part <strong>for</strong><br />

the design process <strong>for</strong> new high-speed trains <strong>and</strong> <strong>for</strong><br />

investigating services in the existing trains [33, 61].<br />

British Rail Research designed its first train operation<br />

simulator in 1970. This powerful simulator, called<br />

GATTS, ran on a mainframe computer <strong>and</strong> was there<strong>for</strong>e<br />

less user-friendly <strong>and</strong> required complex skills <strong>and</strong><br />

computer knowledge to set up <strong>and</strong> run a simulation.<br />

In 1987, VISION <strong>and</strong> OSLO simulators were developed<br />

as a new version, which took full advantage of the modem<br />

computing technology. VISION was designed as an<br />

easy-to-use simulator with the capability of modeling<br />

the systems that are currently in use or are planned to<br />

be built on British Railways in the near future. It is userfriendly,<br />

so train timetable <strong>and</strong> infrastructure planners<br />

who were not computer experts could also operate it.<br />

Other typical simulation systems include the RAILSIM<br />

<strong>Train</strong> Per<strong>for</strong>mance Calculator (TPC) systems developed<br />

in USA, which can per<strong>for</strong>m important analysis <strong>and</strong> computations<br />

to predict the train travel schedules, evaluate<br />

the traction per<strong>for</strong>mances of rolling stock, compare<br />

different possible results in different train scheduling<br />

scenarios, calculate train start-<strong>and</strong>-stop parameters on<br />

longest <strong>and</strong> steepest ramps, as well as maximum loading<br />

<strong>and</strong> speed, <strong>and</strong> so on. Also, <strong>Train</strong>STAR is an engineers’<br />

auxiliary system developed in USA, aiming at<br />

improving train operation, reducing energy consumption<br />

<strong>and</strong> increasing safety per<strong>for</strong>mance. Moreover,<br />

UTRAS was developed by a Japanese transportation<br />

laboratory, in 1990s, to be a general railway simulation<br />

system. This system can carry out various train<br />

operation computations, delays <strong>and</strong> resumption analysis,<br />

signaling effects <strong>and</strong> prediction, <strong>and</strong> train capacity<br />

evaluation, among others.<br />

As the high-speed railway facilities <strong>and</strong> services continuously<br />

exp<strong>and</strong> worldwide, particularly in China with<br />

DPL in place, automatic train operation simulation systems<br />

have become a research focus <strong>for</strong> many institutes<br />

<strong>and</strong> universities. As a result, many simulation tools have<br />

been built, tested <strong>and</strong> applied. As one example, a train<br />

tracing model <strong>for</strong> the moving blocking system with different<br />

types of trains running was developed based on<br />

the cellular automaton concept in [31]. Colored Petri net<br />

tool is a useful modeling method <strong>for</strong> describing the structure<br />

<strong>and</strong> function of a system with graphs, which is particularly<br />

suitable <strong>for</strong> modeling <strong>and</strong> simulating large-sized<br />

asynchronous <strong>and</strong> concurrent systems [62]. A <strong>for</strong>mal<br />

14 IEEE CIRCUITS AND SYSTEMS MAGAZINE SECOND QUARTER 2010


descriptive modeling <strong>for</strong> train tracking systems was suggested<br />

in [63, 65], <strong>and</strong> a centralized control system that<br />

can track two trains simultaneously was developed with<br />

a simulation plat<strong>for</strong>m in [64]. In the field of train operation<br />

control systems using Petri net, a layered model of<br />

ETCS using colored Petri net was proposed <strong>and</strong> simulated<br />

by CPN/tools [66]. <strong>Train</strong> operation behavior was<br />

1 Current status of wireless<br />

GSM-R, linked with<br />

Current location <strong>and</strong> status of<br />

onboard equipment, linked<br />

with related simulation<br />

modules.<br />

On-board<br />

Equipment<br />

Interlocking<br />

in<strong>for</strong>mation, linked<br />

with interlocking<br />

simulation module.<br />

Interlock<br />

<strong>Simulation</strong><br />

Equipment<br />

All Events<br />

Recorder<br />

GSM-R simulation<br />

module.<br />

Status of track circuit code,<br />

linked with STM simulation<br />

module.<br />

Testing <strong>and</strong> <strong>Simulation</strong> Plat<strong>for</strong>m<br />

Adjoining<br />

RBC<br />

Equipment <strong>for</strong> Testing<br />

TSR<br />

In<strong>for</strong>mation of balise,<br />

linked with balise<br />

simulation module.<br />

CTC<br />

<strong>Simulation</strong><br />

Multitrain<br />

<strong>Simulation</strong><br />

Module<br />

GSM-R<br />

<strong>Simulation</strong><br />

Real<br />

JRU Download<br />

Evaluation<br />

Module<br />

Data Record <strong>and</strong> Analysis<br />

In<strong>for</strong>mation of temporary<br />

speed restriction,<br />

linked with temporary<br />

TSR simulation.<br />

RBC Data<br />

<strong>Simulation</strong><br />

Module<br />

GSM-R<br />

<strong>Simulation</strong><br />

Real<br />

JRU Download<br />

Evaluation<br />

Module<br />

Result Generation<br />

<strong>and</strong> Evaluation<br />

Figure 9. Architecture of the CTCS level-3 simulation testing plat<strong>for</strong>m.<br />

modeled by a mixed Petri net in [67]. A colored Petri net<br />

was also developed to model the train control system<br />

of the Germany railways, which employs 168 layered<br />

networks <strong>and</strong> 2583 network elements to build a system<br />

model with three parts: onboard, RBC <strong>and</strong> environment<br />

[68]. In China, layered model of CTCS level-3 was built<br />

based on a colored Petri net, with basic function models<br />

Balise Data<br />

<strong>Simulation</strong><br />

Module<br />

Balise<br />

Signal<br />

Generator<br />

STM<br />

TCR<br />

Simulator<br />

STM Decoding<br />

<strong>and</strong><br />

Communication<br />

Module<br />

Display <strong>Control</strong><br />

DMI Event<br />

Recorder<br />

SECOND QUARTER 2010 IEEE CIRCUITS AND SYSTEMS MAGAZINE 15<br />

Speed<br />

Interface<br />

Adaption<br />

TIU<br />

Interface<br />

Adaption<br />

RTM RTM BTM TCR<br />

ODO TIU<br />

Equipment <strong>for</strong> Testing (RBC) JRU JRU Equipment <strong>for</strong> Testing (VC/DMI)<br />

1<br />

5<br />

RBC<br />

<strong>Simulation</strong> Display Data<br />

<strong>Train</strong> in<strong>for</strong>mation,<br />

linked with RBC (real or<br />

simulation).<br />

In<strong>for</strong>mation of adjoining RBC,<br />

linked with adjoining RBC<br />

simulation module.<br />

Adjoining<br />

RBC<br />

Demo Interface <strong>for</strong> <strong>Simulation</strong> Test<br />

4<br />

TMS<br />

Scene <strong>Control</strong>ler<br />

SC 3<br />

Speed<br />

Sensor<br />

Simulator<br />

SSS<br />

Static Data<br />

Management<br />

Module <strong>for</strong><br />

Scene Data<br />

Testing <strong>and</strong><br />

Management<br />

TIUS<br />

2<br />

Driver or<br />

Driving<br />

Plat<strong>for</strong>m<br />

<strong>Simulation</strong><br />

DMI


of onboard system <strong>and</strong> RBC system, <strong>and</strong> several wireless<br />

working modes [69].<br />

In the field of object-oriented UML-based modeling<br />

of train operation control systems, a objective-oriented<br />

method was proposed to model the railway signal system,<br />

<strong>and</strong> used to build a railway signal simulation plat<strong>for</strong>m<br />

in [70, 71]. A model <strong>for</strong> the train automatic control<br />

system was built based on object-oriented method in<br />

[72]. A design plan <strong>for</strong> the train automatic drive system<br />

from a model-based approach was proposed using a<br />

language-based in<strong>for</strong>mation analysis technique in [73].<br />

A <strong>for</strong>malized model of microcomputer interlock was designed<br />

<strong>and</strong> tested in [74].<br />

Multi-resolution modeling has been a hot topic in the<br />

field of computer-aided modeling <strong>and</strong> simulation since<br />

1990s, <strong>and</strong> will be one of the few key technologies <strong>for</strong><br />

distributed interactive simulations in the future. The<br />

National Research Council of USA considers multi-resolution<br />

modeling as one of the basic challenges in the<br />

modern modeling <strong>and</strong> simulation technology [75]. An<br />

application of multi-resolution modeling to urban railway<br />

systems simulation was also studied in [76].<br />

In China, research on multi-resolution modeling is<br />

being carried out intensively, <strong>for</strong> example at Beijing Jiaotong<br />

University. For different purposes of applications,<br />

the task of system resolution classification is divided<br />

into RBC internal <strong>and</strong> external operations such as signaling<br />

<strong>and</strong> display between RBC <strong>and</strong> the train, as shown<br />

by Fig. 9 [77]. Along this line, many specific research<br />

projects have been planned <strong>and</strong> funded, <strong>and</strong> are being<br />

carefully per<strong>for</strong>med.<br />

5. Conclusions<br />

Looking into the future, there are several key technologies<br />

to be addressed.<br />

First, better modeling of high-speed trains remains to<br />

be an important <strong>and</strong> yet challenging issue <strong>for</strong> research<br />

<strong>and</strong> development. The high-speed railway system is a<br />

hybrid system composing of elastic flexible body (catenary),<br />

multiple rigid-body (locomotive <strong>and</strong> compartments),<br />

continuous elastic body (railway tracks), sells<br />

(slab tracks), loosely accumulated materials (subgrade),<br />

<strong>and</strong> soil structures (the embankment), etc., which as a<br />

whole is subjected to air-fluid-solid media interactions<br />

with the train. There<strong>for</strong>e, dynamical analysis on the<br />

high-speed train system has to go beyond the traditional<br />

modeling methods <strong>and</strong> take an integrated complex hybrid<br />

systems modeling approach. On the one h<strong>and</strong>, the<br />

model should contain several key components such as<br />

the train, rail, <strong>and</strong> air-fluid-soil subsystems. On the other<br />

h<strong>and</strong>, it should account <strong>for</strong> the impacts <strong>and</strong> effects of<br />

hybrid coupling of multi-body <strong>and</strong> multi-state factors.<br />

Based on a large amount of real data collected from a<br />

train travelling history, it is possible to establish a datadriving<br />

systematic modeling approach which, when theoretical<br />

modeling fails, provides a unique feasible framework<br />

in practice.<br />

Second, automatic high-speed train control systems<br />

are still to be further improved. CBTC is a promising future<br />

direction which, based on the valuable experiences<br />

gained from its simulation <strong>and</strong> utilization in urban railway<br />

systems, will provide good references <strong>and</strong> suggestions<br />

<strong>for</strong> the high-speed train systems development.<br />

Moreover, better <strong>and</strong> more powerful simulation<br />

plat<strong>for</strong>ms <strong>for</strong> high-speed train systems are to be developed<br />

based on the so-called ACP framework: Artificial<br />

systems, Computational experiments <strong>and</strong> Parallel execution.<br />

Similarly, better <strong>and</strong> more powerful automatic<br />

control systems are to be further improved based on<br />

such as ABC (agent-based control) [78] <strong>and</strong> ADP (adaptive<br />

dynamic programming) [79] principles.<br />

In summary, the next-generation Chinese railway systems<br />

will face with new challenges in constructional <strong>and</strong><br />

control technologies. The global coordinated operation<br />

of the high-speed <strong>and</strong> conventional railway systems <strong>and</strong><br />

their automatic control systems are dem<strong>and</strong>ing profound<br />

scientific theories <strong>and</strong> high-end technologies. All<br />

these together calls <strong>for</strong> new progress in high-speed railway<br />

systems design, implementation <strong>and</strong> maintenance,<br />

among other endeavors.<br />

Acknowledgments<br />

The authors acknowledge the support of NSFC Grants<br />

60870013, 60736047 <strong>and</strong> 60834001 <strong>and</strong> would like thank<br />

the reviewers <strong>for</strong> their useful <strong>and</strong> constructive suggestions<br />

which contributed to the improvement of the quality<br />

<strong>and</strong> presentation of this article.<br />

Hairong Dong received the B.S. <strong>and</strong><br />

M.S. degrees in <strong>Automatic</strong> <strong>Control</strong><br />

<strong>and</strong> Basic Mathematics from Zhengzhou<br />

University, Zhengzhou, in 1996<br />

<strong>and</strong> 1999, respectively, <strong>and</strong> the Ph.D.<br />

degree in General <strong>and</strong> Fundamental Mechanics<br />

from Peking University in 2002.<br />

She joined the School of Electronic <strong>and</strong> In<strong>for</strong>mation<br />

Engineering of Beijing Jiaotong University in 2002 <strong>and</strong><br />

currently is an Associate Professor. She was a visiting<br />

scholar to the University of Southampton, UK (2006),<br />

University of Hong Kong (2008), <strong>and</strong> City University of<br />

Hong Kong (2009). In 2007, she served as Project Level-3<br />

Expert in the Department of Transportation of Beijing<br />

Organizing Committee <strong>for</strong> the Olympic Games. Her research<br />

interests include: stability <strong>and</strong> robustness of<br />

complex systems control theory <strong>and</strong> intelligent transportation<br />

systems.<br />

16 IEEE CIRCUITS AND SYSTEMS MAGAZINE SECOND QUARTER 2010


Bin Ning is a Professor in the School of<br />

Electronic <strong>and</strong> In<strong>for</strong>mation Engineering<br />

of Beijing Jiaotong University <strong>and</strong><br />

also the President of the University.<br />

He was a visiting scholar to the Brunel<br />

University, UK, from 1991 to 1992, <strong>and</strong><br />

University of Cali<strong>for</strong>nia, Berkeley, from<br />

2002 to 2003. He directed many key national scientific<br />

projects in China. His scientific interests include: intelligent<br />

transportation systems, communication based<br />

train control, rail transport systems, system fault-tolerant<br />

design, fault diagnosis, system reliability <strong>and</strong> safety<br />

studies. He is a member of the IEEE <strong>and</strong> currently the<br />

Chair of the Technical Committee on Railroad <strong>System</strong>s<br />

<strong>and</strong> Applications of the IEEE Intelligent Transportation<br />

<strong>System</strong>s Society.<br />

Baigen Cai received the B.S. <strong>and</strong> M.S.<br />

degree in Traffic In<strong>for</strong>mation Engineering<br />

<strong>and</strong> <strong>Control</strong> from Beijing Jiaotong<br />

University in 1987 <strong>and</strong> 1990, respectively.<br />

He was a visiting scholar to the Ohio<br />

State University from 1998 to 1999. He<br />

joined Beijing Jiaotong University as an<br />

Assistant Professor in 1990 <strong>and</strong> currently is a Professor<br />

<strong>and</strong> vice-dean of the School of Electronic <strong>and</strong> In<strong>for</strong>mation<br />

Engineering. His research interests include: intelligent<br />

transportation systems, GNSS <strong>and</strong> its applications<br />

in transportations, multi-sensor fusion <strong>and</strong> integration,<br />

<strong>and</strong> intelligent control. He was responsible of several<br />

key national projects. He is an IEEE member <strong>and</strong> serves<br />

as reviewer <strong>for</strong> many international journals.<br />

Zhongsheng Hou received the B.S. <strong>and</strong><br />

M.S. degrees in Applied Mathematics<br />

from Jilin University of Technology,<br />

Changchun, in 1983 <strong>and</strong> 1988, respectively,<br />

<strong>and</strong> the Ph.D. degree in control<br />

theory from Northeastern University,<br />

Shenyang, in 1994. He was a postdoctoral<br />

fellow at the Harbin Institute of Technology, Harbin,<br />

from 1995 to 1997, <strong>and</strong> a visiting scholar to Yale University,<br />

USA, from 2002 to 2003. In 1997, he joined Beijing<br />

Jiaotong University, where currently he is a Professor<br />

in the Advanced <strong>Control</strong> <strong>System</strong>s Lab of the School of<br />

Electronic <strong>and</strong> In<strong>for</strong>mation Engineering. His research<br />

interests include: data-driven control, model-free adaptive<br />

control, adaptive/learning control, <strong>and</strong> intelligent<br />

transportation systems.<br />

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18 IEEE CIRCUITS AND SYSTEMS MAGAZINE SECOND QUARTER 2010

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