精密平台磁敏智能隔振系统自适应PI控制研究

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Abstract To suppress time-varying vibrations in precision machining processes, a semi-active adaptive PI control method based on magnetorheological elastomer (MRE) was proposed. Firstly, the dynamic model of the MRE isolation system was established based on the variable stiffness isolation principle,and then the semi-active control conditions were derived. Secondly, taking the response acceleration and target acceleration deviation as the input of the PI controller, the optimal PI control parameters under different vibration frequencies and amplitudes were optimized by genetic algorithm, and the frequency amplitude dependent adaptive law was obtained based on the passive reference model.This method does not need to identify the frequency by complicated Fourier transform, and has high real-time performance. Finally, the effectiveness of the designed controller was verified by simulation and experiment. The results show that compared with the traditional PI controller, the proposed method has greater suppression at 40Hz-50Hz and 1.0 m/s2 - 3.0 m/s2 time-varying vibration.

Key words： Magnetorheological elastomer isolator Precision fabrication platform Adaptive PI controller Time-varying excitation

Received: 19 July 2023 Published: 28 April 2024

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I8/232

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