Conference Program of WCICA 2012

Conference Program WCICA 2012
so the main disturbances are found. Then a non-linear disturbance
observer (NDO) is presented to estimate and compensate the main
disturbances. Finally, DIC based on NDO is designed, which is a compound
of DIC and NDO. And simulation studies show that the controller
based on NDO is robust and meets the performance requirements in
presence of disturbances and uncertainties.
◮ SuB07-4 17:10–17:30
Tracking Trajectory of Heterogenous Multi-Agent Systems with Disturbance
Observer Based Control, pp.2352–2357
Yang, Hong-yong
Guo, Lei
Han, Chao
Ludong Univ.
Beihang Univ.
BeiHang Univ.
In this paper, the multi-agent systems are composed of two class
different agents, one parts are supposed to moving on the double
integrator dynamics, the other parts are driven by the single integrator
dynamics. By applying the disturbance observer based control
(DOBC), sufficient consensus criteria of the heterogenous
multi-agent systems with exogenous disturbances are presented for
with fixed topologies and switching topologies. A pinning control
strategy is designed for a part of agents of the systems, and this
pinning control can bring the states of multi-agent systems to an expected
consensus track. Finally, the consensus of multi-agent systems
with exogenous disturbances is verified by an example of four
multi-agent systems.
◮ SuB07-5 17:30–17:50
Active Disturbance Rejection Control for the Gimbal Servo System of
Magnetically Suspended Single Gimbal Control Momentum Gyroscope,
pp.2865–2869
Wei, Kongming
Wu, Zhong
Beijing Univ. of Aeronautics & Astronautics
Beijing Univ. of Aeronautics & Astronautics
To improve the accuracy of the output torque, maintain high precision
attitude control and ensure the safe operation of the magnetically suspended
bearing, the gimbal servo system of Magnetically Suspended
Single Gimbal Control Momentum Gyroscope(MS-SGCMG) must have
high control performance and reject the disturbance well. A novel Active
Disturbance Rejection Control(ADRC) controller is designed to meet
these requirements. The controller can cancel the disturbance by observing
the output and relax the impulse brought by the sharp change
of the gimbal command. A new method, based on observer, for resolving
the resolver is introduced. The resolving process can be merged
in the observing of the state of the servo system, which simplifies the
controller. The experiment results show than the controller obtains high
accuracy without overshoot and compensates the disturbance distinctly.
SuB08 15:50–17:50 Room 310
Biomedical Engineering
Chair: Wang, Jiang
Co-Chair: LI, Baopu
Tianjin Univ.
The Chinese Univ. of Hong Kong
◮ SuB08-1 15:50–16:10
Aeration control of activated sludge wastewater treatment process using
optimal control, pp.4969–4973
Wu, Jie
East China Univ. of Sci. & technoledge
In order to reduce energy consumption of aeration processes, an optimal
control was studied. Simplified model of aeration system was built
according to Activated Sludge Model No.1 (ASM1) presented by International
Association on Water Quality (IAWQ), then the optimal control
strategy based on reduced-order observer was brought forward for
the aeration system. The proposed optimal control strategy was implemented
on a benchmark wastewater treatment process-Benchmark
Simulation Model 1(BSM1). Compared with PID control strategy recommended
in benchmark, using the proposed control strategy, the effluent
water quality and the time of effluent water quality exceeding
the discharge standard of BSM1 are more stable, while more than 4%
aeration energy is saved.
◮ SuB08-2 16:10–16:30
UKF-based state feedback control of abnormal neural oscillations in
demyelination symptom, pp.4984–4988
Jin, Qitao
Wang, Jiang
Li, Huiyan
Deng, Bin
Wei, Xile
Che, Yan-Qiu
Dong, Feng
Tianjin Univ.
Tianjin Univ.
Tianjin Univ. of Tech. & Education
tianjin Univ.
Tianjin Univ.
Tianjin Univ. of Tech. & Education
Tianjin Univ.
Fast axonal conduction of action potentials in mammals relies on myelin
insulation. Demyelination can cause slowed, blocked, desynchronized,
or paradoxically excessive spiking that underlies the symptoms observed
in demyelination diseases. Feedback control via functional electrical
stimulation (FES) seems to be a promising treatment modality in
such diseases. However, there are challenges to implementing such
method for neurons: high nonlinearity, biological tissue constrains and
unobservable ion channel states. To address this problem, we propose
an estimating and tracking control strategy for systems based on
Kalman filter, in order to enhance the action potential propagation reliability
of demyelinated neuron via FES. Our method could promote the
design of new closed-loop electrical stimulation systems for patients
suffering from different nerve system dysfunctions.
◮ SuB08-3 16:30–16:50
Research on digital pulse oximeter based on optical frequency converter,
pp.5056–5060
Ni, Pingqiang
LI, Baopu
Chinese Acad. of Sci.
The Chinese Univ. of Hong Kong
This paper specifically describes the design of hardware and software
of a digital pulse oximeter based on ARM core embedded system and
light-frequency converter. In this study, a light-frequency converter instead
of a photodiode was adopted to receive the light transmitting,
which greatly simplified the design of hardware. Besides, traditional
methods of calculate frequency of rectangle signal were improved and
an algorithm with stable sampling rate and high resolution was proposed.
Based on the filtering and detecting methods of the pulse signal,
the baseline drift and the noise on high frequency were successfully removed
by applying integer coefficient filter. A detecting algorithm based
on difference and threshold was proposed, and the future points of the
signal can be extracted effectively. The result shows that this oximeter
can overcome usual noise, the software is very flexible and simple in
structure.
◮ SuB08-4 16:50–17:10
Synchronization between Outputs of Neurons and Neuron Populations
with Discrete Control Algorithm Basing on Least-square Method,
pp.5001–5006
Jia, Chenhui
Wang, Jiang
Deng, Bin
Wei, Xile
Che, Yan-Qiu
Dong, Feng
Tianjin Univ.
Tianjin Univ.
tianjin Univ.
Tianjin Univ.
Tianjin Univ. of Tech. & Education
Tianjin Univ.
As a new method on curing mental diseases, Deep Brain Stimulation
(DBS) gives great help to patients who do not respond to drug therapies.
However, most of the DBS therapies used at present are using
high-frequency signals as open-loop stimulating signals, whose mechanism
is not sufficiently understood. In this paper, basing on the synchronization
mechanism and the close-loop stability theory, we have
designed a close-loop method to propose a potential therapy for curing
mental diseases with deep brain stimulation. Through reconstruct
the input-output dynamics with least square method, we can use a new
regressive input-output model to describe the relationship between the
input and output of the abnormal neuron population. Using the parameters
estimated in the regressive model, we can design a set of DBS
signals to make the output of abnormal neuron population accurately
track the desired output signal. The method is robust and can be ap-
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