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Luo W.,Guangxi University of Science and Technology | Luo W.,Guangxi Key Laboratory of Automobile Components and Vehicle Technology | Yu Y.,Guangxi University of Science and Technology | Xie G.,Peking University | Lan H.,Guangxi University of Science and Technology
Shenzhen Daxue Xuebao (Ligong Ban)/Journal of Shenzhen University Science and Engineering | Year: 2013

A new circuit switching system model is presented to solve irregular phenomena often occurring in circuit switching system, e.g. Buck type converter. The stability and chaotic dynamic behavior of the switched system was analyzed based on time-domain waveform, phase-trajectory diagram and bifurcation diagram. The PSO-PID controller is introduced to optimize the controller parameters with the use of drive-response synchronization and particle swarm optimization algorithm. The operation stability of the circuit switching system in a single-period state is therefore guaranteed. The simulation results show that the controller is able to lead the system from chaos to periodic states, and the chaos of the system is reduced efficiently.


Liu A.,Guangxi University of Science and Technology | Li L.,Peking University | Luo W.,Guangxi University of Science and Technology | Luo W.,Guangxi Key Laboratory of Automobile Components and Vehicle Technology | Xie G.,Peking University
Jiqiren/Robot | Year: 2016

Firstly, a simple linear CPG (central pattern generator) model is adopted to implement smooth transformations between various swimming gaits. Then, a function of the transition layer between CPG control parameters and the speed as well as the turning velocity of the robotic fish can be obtained through experiments. Further, an improved posture controller based on the proportional guidance controller is proposed, in which the posture error of robotic fish is redefined and its angle error is added to the proportional controller of the position error as a bias compensation. The feasibility and effectiveness of the proposed controller is verified by various experiments. © 2016, Science Press. All right reserved.


Gao Y.,Wuhan University of Technology | Gao Y.,Guangxi University of Technology | Gao Y.,Guangxi Key Laboratory of Automobile Components and Vehicle Technology | Fan J.,Guangxi University of Technology | And 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

A self-adaptive sliding mode control method based on back-stepping design theory was presented, which was used to control chaos in the uncertain automobile suspension system with extern disturbance. The total uncertain factors in the system were estimated by self-adaptive algorithm. The asymptotic stability of controller was proved by Lyapunov theory. Simulation results demonstrate that even if suspension system exists time-variable parameters, uncertain mathematical model and different grade roads interference, this method can realize control chaotic vibration to the steady state, reduce vertical displacement, velocity and acceleration of suspension vibration very much, improve comfort and safety of driving evidently. The presented controller is independent of nonlinear term of the suspension model, and can offset the uncertain influences by adaptive estimating of disturbances. Hence, the control method has better adaptability and robustness. The research results provide a useful reference for design the controllable suspension system with good vehicle ride comfort.


Li J.,Guangxi University of Science and Technology | Rong J.-L.,Beijing Institute of Technology | Lin X.-K.,Guangxi Key Laboratory of Automobile Components and Vehicle Technology | Xiang D.-L.,Beijing Institute of Technology
Binggong Xuebao/Acta Armamentarii | Year: 2014

Subroutines which define the hydrostatic pressure and boundary conditions of the three-dimension fluid field are developed based on MSC. DYTRAN software. The volume-acceleration model is introduced to determine the initial condition of bubble pulsation in underwater explosion. The numerical simulations are compared with the results of validated experimental data. The calculated results of pulsation radius and period of single bubble are well agreement with the experimental results. The interaction of two bubbles is studied systematically, and the relative law of that the dynamic behaviors of bubbles are closely related distance and initial angle is summarized. The bubble model and numerical simulation arevaluable to correlative theory research and engineering calculation.


Gao Y.,Guangxi University of Science and Technology | Gao Y.,Guangxi Key Laboratory of Automobile Components and Vehicle Technology | Fan J.,Guangxi University of Science and Technology | Fan J.,Guangxi Key Laboratory of Automobile Components and Vehicle Technology | And 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

A fractional-order fuzzy control method was presented for vehicle nonlinear active suspension. This new scheme used a fractional-order differential signal as one of the control inputs, and the fractional order was obtained based on the minimum criteria of the suspension system comprehensive performance index function. Simulation results demonstrate that under the driving cycles with various grade roads and vehicle speeds, comparing with the traditional integral-order fuzzy control method, the presented method has better control performances including further reducing body acceleration, suspension travel and tyre deflection, and can improve the ride comfort and handling stability of vehicle effectively. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.

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