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Multi Objective Robust Active Vibration Control for Flexure Jointed Struts of Stewart Platforms via h∞ and μ synthesis

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Chinese Journal of Aeronautics 2008年第2期21卷 125-133页

作者：刘磊王本利哈尔滨工业大学卫星技术研究所黑龙江哈尔滨150080

Active vibration control is needed for future space telescopes, space laser communication and other precision sensitive payloads which require ultra-quiet environments. A Stewart platform based hybrid isolator with 6 hybrid struts is the effective system for active/passive vibration isolation over 5-250 hz band. Using an identification transfer matrix of the Stewart platform, the coupling analysis of six channels is provided. A dynamics model is derived, and the rigid mode is removed to keep the signal of pointing control. Multi objective robust h∞ and μ synthesis strategies, based on singular values and structured singular values respectively, are presented, which simultaneously satisfy the low frequency pointing and high frequency disturbance rejection requirements and take account of the model uncertainty, parametric uncertainty and sensor noise. Then, by performing robust stability test, it is shown that the two controllers are robust to the uncertainties, the robust stability margin of h, controller is less than that of μ controller, but the order of μ controller is higher than that of h, controller, so the balanced controller reduction is provided. Additionally, the μ controller is compared with a PI controller. The time domain simulation of the μ controller indicates that the two robust control strategies are effective for keeping the pointing command and isolating the harmonic and stochastic disturbances.

关键词： vibration isolation active struts Stewart platform h∞ synthesis μ synthesis rigid mode model reduction

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h∞ Analysis and Controller synthesis via a Descriptor System Approach

H∞ Analysis and Controller Synthesis via a Descriptor Syste...

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第二十七届中国控制会议

作者： Cheng Peng1,Cao Yongyan2,Sun Youxian1 1.Institute of Industrial Process Control,State Key Laboratory of Industrial Control Technology Zhejiang University,hangzhou 310027,P.R.China 2.Department of Automation,Wuhan University of Science and Technology,Wuhan 430081,P.R.China

The problem of h analysis and synthesis of linear uncertain systems is addressed via parameter-dependent Lyapunov *** polyqudratic h stability as well as the affine quadratic h stability is defined,and the corresponding sufficient conditions of LMI form are derived based on a descriptor system *** refraining the slack matrices,h state feedback controllers could also be constructed by LMI *** effectiveness is demonstrated by a numerical example.

关键词： Robust Performance Analysis h∞ synthesis Descriptor Systems Parameter-dependent Lyapunov Functions Polytopic Systems Affine Parameter Systems

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Design of h∞ State Feedback Controller for Gas Turbine Engine Distributed Control with Random Packet-dropouts

Design of H∞ State Feedback Controller for Gas Turbine Engi...

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第36届中国控制会议

作者： LIU Xiaofeng LI Yanxi SUN Xu School of Transportation Science and Engineering Beihang University School of Energy and Power Engineering Beihang University

The distributed control architecture becomes more and more important in future gas turbine engine control systems,in which,the sensors and actuators will be connected to the controllers via a ***,the control problem of networkenabled high-performance distributed engine control(DEC) has come to play an important role in modern gas turbine control ***,due to the properties of the network,the packet-dropouts must be *** study introduces a distributed control system architecture based on a networked cascade control system(NCCS).Typical turboshaft engine-distributed controllers are designed based on the NCCS framework with a h state feedback under random *** sufficient robust exponential mean-stable conditions are derived via the Lyapunov stability theory and linear matrix inequality *** illustrate the effectiveness of the presented method.

关键词： Distributed engine control Networked cascade control Robust mean-stable h∞ synthesis Packet-dropout

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