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Nonlinear finite time attitude control of flexible spacecraft based on a novel output redefinition method

Chinese Journal of Aeronautics 2023年第11期36卷 373-385页

作者： Seyed Majid ESMAEILZADEh Mohammad Sadegh ZEYGhAMI Department of Electrical Engineering Iran University of Science and TechnologyNarmakTehran 16846-13114Iran

A finite time attitude controller is designed for a flexible spacecraft based on a novel output redefinition method, in this paper. To make the flexible appendages vibration suppression effective, the appendage tip-point is selected as the output. First, a novel output redefinition method is proposed to overcome the non-minimum phase property of the dynamic model. The proposed method not only makes the system model minimum phase but also improves the attitude control system performance. Consequently, the precise attitude pointing and stabilization are ***, a nonlinear finite time h∞controller is designed based on the backstepping approach. For the situation where the modal variables measurements are not available, a modal observer is also designed. The simulation results show the effectiveness of the proposed method in the presence of the model uncertainties and environmental disturbances.

关键词： Finite time Output redefinition h1 control Attitude control Flexible spacecraft Backstepping Robust

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h_(∞)control in the frequency domain for a semi-active floor isolation system

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Frontiers of Structural and Civil Engineering 2013年第3期7卷 264-275页

作者： Yundong ShI Tracy C BECKER Masahiro KURATA Masayoshi NAKAShIMA Graduate School of Engineering Kyoto UniversityKyoto 611-0011Japan Disaster Prevention Research Institute Kyoto UniversityKyoto 611-0011Japan

A floor isolation system installed in a single floor or room in a fixed base structure is designed to protect *** this configuration,the input motions to the floor isolation from the ground motions are filtered by the structure,leaving the majority of the frequency content of the input motion lower than the predominant frequency of the *** floor isolation system should minimize the acceleration to protect equipment;however,displacement must also be limited to save floor space,especially with long period ***-active control with an h_(∞)control was adopted for the floor isolation system and a new input shaping filter was developed to account for the input motion characteristics and enhance the effectiveness of the h_(∞)control.A series of shake table tests for a semi-active floor isolation system using rolling pendulum isolators and a magnetic-rheological damper were performed to validate the h_(∞)*** control using an oil damper was also tested for *** test results show that the h_(∞)control effectively reduced acceleration for short period motions with frequencies close to the predominant frequency of the structure,as well as effectively reduced displacement for long period motions with frequencies close to the natural frequency of the floor isolation *** h_(∞)control algorithm proved to be more advantageous than passive control because of its capacity to adjust control strategies according to the different motion frequency characteristics.

关键词： semi-active floor isolation h1 control MR damper shaping filter shaking table test

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维普期刊数据库

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h∞ control for uncertain Markovian jump systems with mode-dependent mixed delays

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Progress in Natural Science:Materials International 2008年第3期18卷 309-314页

作者： Yingchun Wang, huaguang Zhang School of Information Science and Engineering, Northeastern University, Shenyang 110004, China School of Information Science and Engineering Northeastern University Shenyang 110004 China

We study the problem of h∞control for a class of Markovian jump systems with norm-bounded parameter uncertainties and mode- dependent mixed delays including discrete delays and distributed delays in this paper. Our aim is to present a new delay-dependent con- trol approach such that the resulting closed-loop system is robust mean-square (MS) exponentially stable and satisfies a prescribed h∞performance level, irrespective of the parameter uncertainties. Such delay-dependent approach does not require system transformation or free-weighting matrix. A numerical example shows that the results are less conservative and more effective.

关键词： h1 control Markovian jump Mixed delays Delay-dependent criterion

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