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Robustness analysis of control systems with disc uncertainties
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作者 Zhizhen WANG Long WANG Wensheng YU 《控制理论与应用(英文版)》 EI 2005年第4期327-333,共7页
For a class of control systems with disc uncertainties, robust performance anaysis is developed. On the strictly positive realness and H-infinity-norm of uncertain systems, from the geometric point of view, two new su... For a class of control systems with disc uncertainties, robust performance anaysis is developed. On the strictly positive realness and H-infinity-norm of uncertain systems, from the geometric point of view, two new sufficient and necessary conditions are given. The largest H-infinity-norm bound, containing the coefficients of only stable polynomials and centered at a nominal stable point in the coecient space is found. The results obtained in the paper are tractable and concise, which is illustrated by some numerical examples. 展开更多
关键词 Robusmess Disc polynomial strictly positive realness Hurwitz stability H-infinity-norm
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FOUR WHEELS DRIVEN INDEPENDENTLY BY ONE PUMP DRIVING FOUR HYDRAULIC MOTORS 被引量:3
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作者 WuBaolin QiuLihua WangZhanlin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2005年第2期232-236,共5页
An improved Narendra model reference adaptive control (MRAC) scheme isproposed to research one variable displacement pump driving four hydraulic variable displacementmotors. This approach not only ensures the underdam... An improved Narendra model reference adaptive control (MRAC) scheme isproposed to research one variable displacement pump driving four hydraulic variable displacementmotors. This approach not only ensures the underdamped and unstable system be global uniformasymptotic stability, but also has good robustness in these aspects of modeling uncertainty,pressure fluctuation of constant pressure network, and disturbance from external load, which alsoupgrades the rapidity of system response so as to make controlled system with nicer dynamic quality.The scheme of one pump driving four motors can meet the demand on off-road mobility of engineeringvehicles and armored cars. A proof of stability about improved Narendra MRAC scheme is also given. 展开更多
关键词 Constant pressure network Rotational speed control Model reference adaptivecontrol(MRAC) Strict positive realness Global uniform stability
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Robust decentralized adaptive output feedback fuzzy controller design and application to AHS
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作者 Yishao Huang Dequn Zhou +2 位作者 Xiaoxin Chen Xueyun Chen Zhengwu Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第5期842-849,共8页
A novel decentralized indirect adaptive output feedback fuzzy controller is developed for a class of large-scale uncertain nonlinear systems using error filtering.By the properly filtering of the observation error dyn... A novel decentralized indirect adaptive output feedback fuzzy controller is developed for a class of large-scale uncertain nonlinear systems using error filtering.By the properly filtering of the observation error dynamics,the strictly positive-real condition is guaranteed to hold such that the proposed output feedback and adaptation mechanisms are practicable in practice owing to the fact that its implementation does not require the observation error vector itself any more,which corrects the impracticable schemes in the previous literature involved.The presented control algorithm can ensure that all the signals of the closed-loop large-scale system keep uniformly ultimately bounded and that the tracking error converges to zero asymptotically.The decentralized output feedback fuzzy controller can be applied to address the longitudinal control problem of a string of vehicles within an automated highway system(AHS) and the effectiveness of the design procedure is supported by simulation results. 展开更多
关键词 large-scale nonlinear system fuzzy control output feedback decentralized control strictly positive real(SPR) condition automated highway system(AHS).
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Robust strictly positive real synthesis for polynomial families of arbitrary order
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作者 YUWensheng WANGLong JürgenAckermann 《Science in China(Series F)》 2004年第4期475-489,共15页
For any two n-th order polynomials a(s) and b(s), the Hurwitz stability of their convex combination is necessary and sufficient for the existence of a polynomial c(s) such that c(s)/a(s) and c(s)/b(s) are both strictl... For any two n-th order polynomials a(s) and b(s), the Hurwitz stability of their convex combination is necessary and sufficient for the existence of a polynomial c(s) such that c(s)/a(s) and c(s)/b(s) are both strictly positive real. 展开更多
关键词 robust stability strict positive realness robustness analysis and synthesis polynomial segment.
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A Backstepping Simple Adaptive Control Application to Flexible Space Structures 被引量:4
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作者 LIU Min XU Shijie HAN Chao 《Chinese Journal of Aeronautics》 SCIE EI CSCD 2012年第3期446-452,共7页
Although the simple adaptive control (SAC) is widely studied both in theory and application in flexible space structure control and other control problems, it is restricted by the almost strictly positive real (ASP... Although the simple adaptive control (SAC) is widely studied both in theory and application in flexible space structure control and other control problems, it is restricted by the almost strictly positive real (ASPR) conditions. In most practical control problems, the ASPR conditions are not satisfied. Therefore, based on the SAC theory, this paper proposes a backstepping simple adaptive control algorithm which suits the system with arbitrary relative degree with no need of parallel feed forward compensa- tor. The proposed control algorithm consists of decomposition of the arbitrary relative degree system into a known subsystem and an unknown ASPR subsystem which are connected in cascade, design of constant output feedback controller for the known subsystem, and implementation of backstepping method and SAC of the unknown ASPR subsystem. Inheriting the characteristics of the SAC, this method can be adaptive online for the parameter uncertainties. Then, the application of the proposed controller to large flexible space structure with collocated sensors and actuators is studied, and the simulation results validate the proposed controller. It is a new strategy to apply the classical SAC to high relative degree plants. 展开更多
关键词 simple adaptive control almost strictly positive real BACKSTEPPING flexible structure intermediate control law
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Observer-based Variable Universe Adaptive Fuzzy Controller Without Additional Dynamic Order 被引量:1
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作者 Hai-Gang Guo Bao-Jie Zhang 《International Journal of Automation and computing》 EI CSCD 2014年第4期418-425,共8页
A high-precision fuzzy controller, based on a state observer, is developed for a class of nonlinear single-input-single-output(SISO) systems with system uncertainties and external disturbances. The state observer is i... A high-precision fuzzy controller, based on a state observer, is developed for a class of nonlinear single-input-single-output(SISO) systems with system uncertainties and external disturbances. The state observer is introduced to resolve the problem of the unavailability of state variables. Assisted by the observer, a variable universe fuzzy system is designed to approximate the ideal control law. Being auxiliary components, a robust control term and a state feedback control term are designed to suppress the influence of the lumped uncertainties and remove the observation error, respectively. Different from the existing results, no additional dynamic order is required for the control design. All the adaptive laws and the control law are built based on the Lyapunov synthesis approach, and the signals involved in the closed-loop system are guaranteed to be uniformly ultimately bounded. Simulation results performed on Duffing forced oscillation demonstrate the advantages of the proposed control scheme. 展开更多
关键词 Variable universe fuzzy system OBSERVER strictly positive real (SPR) condition dynamic order σ-modification adaptive bounding technique
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