Conference Program of WCICA 2012

Conference Program WCICA 2012
of hydroelectric process. For the different object to build different fineness
of model, this paper uses multi-scale modeling approach and rational
scheduling mechanism to realize optimal operation of simulation,
as well as designing the real-time enhanced program on a LINUX system.
By comparison with the off-line system simulation of SIMULINK,
the results show that the system is fully capable to meet the requirement
of hydraulic turbine governing system on real-time, reflecting the
advantages of real-time continuous simulation.
◁ PFrA-27
Periodicity Analysis of Uncertain Neural Networks With Multiple Time-
Varying Delays, pp.174–179
Lou, Xuyang
Ye, Qian
Feng, Wei
Cui, Baotong
Jiangnan Univ.
Jiangnan Univ.
Jiangnan Univ.
Jiangnan Univ.
The problem of global robust periodicity is studied for a class of neural
networks with norm-bounded parameter uncertainties and multiple
time-varying delays. Some linear matrix inequality (LMI) representations
of delay-dependent periodicity criteria guaranteeing the existence,
uniqueness and global asymptotic stability of periodic solution for all admissible
parametric uncertainties are presented. The proposed method
is based on the S-procedure and an extended integral inequality which
can be deduced from the well known Leibniz-Newton formula and the
Moon’s inequality. The results extend some models reported in the
literature and improve conservativeness of those in the case that the
derivative of the time-varying delay is assumed to be less than one.
◁ PFrA-28
Solar Sail Trajectory Optimization Based on Improved Imperialist Competitive
Algorithm, pp.191–195
WANG, Yong
Zhu, Min
WEI, Yiheng
Zhang, Yang
Univ. of Sci. & Tech. of China
Univ. of Sci. & Tech. of China
Univ. of Sci. & Tech. of China
Shanghai Inst. of Satellite Engineering
In this paper we discuss the minimum-time orbit transfers of solar sail
spacecraft for Mercury sample return missions using solar radiation
pressure. In order to find the minimum-time trajectory transfers, the
optimal pitch angle of the solar sail has to be determined. We transform
the optimal control problem to parameterized nonlinear programming
problem by using the direct shooting method. Then, the improved imperialist
competitive algorithm is used to optimize the pitch angle and the
transfer time of the solar sail. Thus, we can obtain the optimal transfer
trajectory according to the sail’s orbital dynamics. Furthermore,
transfers from the Earth orbit to Mercury and from the Mercury orbit to
Earth of the solar sail is simulated, the results show that it meets the
orbit terminal constraints well and the results in this paper are better
than the existing results.
◁ PFrA-29
Indirect Adaptive Fuzzy Sliding Mode Control for Uncertain Multi-link
Robots, pp.199–203
Mu, Xiaojiang
Ge, Li
shenzhen Inst. of information Tech.
Shenzhen Inst. of Information Tech.
An indirect adaptive fuzzy sliding mode controller is presented for trajectory
tracking control of uncertain multi-link robots. This approach
combines adaptive fuzzy control and global fast sliding mode control,
and adopts a global fast sliding mode manifold which can drive system
to reach balance point in finite time. Three fuzzy systems are designed
to learn the uncertain robot parameters and external disturbances. So
the control system can automatically track the robot parameters and
disturbances, and reduces chattering of the controller. Prediction estimation
for robot parameters and disturbances is not needed too. The
control speed is quickened by simplifying the robot structure and decreasing
learning parameters of the uncertain robot. Moreover, the system
stability is proved by Lyapunov principle. Simulation results verify
the validity of the control scheme.
◁ PFrA-30
Fuzzy Control for Hyperchaotic Systems via Nonuniform Sampling Approach,
pp.214–219
Yang, Dedong
Wang, Jinhuan
Sun, Hexu
Yang, Peng
Hebei Univ. of Tech.
Hebei Univ. of Tech.
Hebei Univ. of Tech.
Heibei Univ. of Tech.
In this paper, the stabilization problem for the hyperchaotic Chen system
is investigated via nonuniform sampling approach. First, the hyperchaotic
Chen system is represented by the Takagi–Sugeno (T–S)
fuzzy model via the sector nonlinearity approach. Second, utilizing the
descriptor model transformation and the input delay approach, an e-
quivalent continuous-time generalized form is obtained and sufficient
conditions for the existence of state feedback controller are derived in
terms of linear matrix inequities (LMIs), which guarantee the asymptotic
stability for the controlled closed-loop system. Lastly, simulation results
are given to show the validity of the present scheme.
◁ PFrA-31
Identification and Prediction of Nonlinear Multi-parameter Based on
Least Squares Support Vector Machine, pp.224–228
Hou, Yuan-bin
Li, Ning
Xi’an Univ. of Sci. & Tech.
Xi’an Univ. of Sci. & Tech.
The circulating fluidized bed boiler is key equipment in intrinsically safe
coal gangue power generation, after analyzing of the typical fault and
hidden fault of main components of boiler system, as well as the treating
methods, directed towards the nonlinear characteristics of the oxygen
content of flue gas of the induced draft fan has many factors influence,
a method based on least squares support vector machine (LS-SVM)
used in flue gas oxygen content model recognition is proposed. the
measured crucial parameter of influence the stable operation of the
boiler are used to identification and prediction, including the oxygen
content of the flue gas, coal gangue flow and material return pressure
imitation, as the results show that this method has higher precision (
the error is less than 6‰); Compared with general SVM, this method
reduces the complexity of the calculation
◁ PFrA-32
Complex Dynamical Behaviors Analysis of a Voltage-controlled Memristive
System, pp.239–244
Sun, Junwei
Shen, Yi
Huazhong Univ. of Sci. & Tech.
Huazhong Univ. of Sci. & Tech., China
The contribution is concerned on structural properties and general features
of the new ideal circuit element, a memristor. The previous memristive
system is only focused on the voltage versus current curves with
increasing frequency of the alternating voltage source. The paper extends
the notion of the voltage versus current curves to the resistance
versus current curves and the voltage versus resistance curves, and
those which are influenced by the initial conditions, frequency, voltage,
a and b, and input excitation. The paper has emulated by MATLAB,
more comprehensive and systematic analyzes and obtains a lot of the
new characteristics of memristive system and important information.
◁ PFrA-33
Design and Simulation for Dual-Stage Actuator Systems with Multi-rate
and Friction Compensation Controller, pp.245–250
Wei, Dongfang
Yang, Jun
Wuhan Univ. of Sci. & Tech.
Engineering Research Center of Metallurgical
Automation & Measurement Tech.,Ministry of
EducationInsitution
This paper studies the structure and model of a dual-stage actuator (D-
SA) control system. A multi-rate controller with friction compensation is
designed to reduce the computational load, which will greatly improve
the system’s performance. The dual-stage actuator(DSA)control system
consists of a linear motor and a piezoelectric actuator. By combining
the system with properly designed control method, the two actuators
are complementary to each other, so that the system can achieve
fast response and high precision to meet the requirements in industry.
The multi-rate control law can decrease the computational load with a
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