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<p>The Magnetorheological Elastomer (MRE)-based intelligent isolator exhibits excellent vibration attenuation performance on precision machining or measurement platform under time-varying excitation. However, addressing the time-varying delay in vibration control systems remains a challenge, as it can degrade vibration attenuation or even amplify vibrations. To address the issue, this paper proposes a novel adaptive time delay compensator(ATDC) to eliminate the phase difference between control signal and response signal induced by time-varying delay. Firstly, the time delay in the MRE fuzzy control system is analyzed under various vibration excitations. Based on this analysis, the optimal delay compensation law dependent on excitation frequency is determined based on time delay compensation theory. Subsequently, by establishing a correlation between the frequency and the amplitude ratio of excitation to response through a passive model, the frequency is effectively "eliminated." This results in an ATDC law that relies solely on the excitation and response amplitudes, enabling it to adapt the varying frequency without the need for identifying the specific excitation frequency through the Fast Fourier Transform (FFT) method. Finally, the effectiveness of the proposed ATDC is verified through experiments involving time-varying vibrations from 45 to 65&#xa0;Hz and 0.5 to 3.0&#xa0;m/s<sup>2</sup>. Experimental results indicate that ATDC can improves better control performancewith lower energy consumption compared with system without ATDC.</p>

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Model reference adaptive time-varying delay compensator design for magnetorheological elastomer-based vibration isolation system

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Jie Fu,
  • Can Zhong,
  • Wang Li,
  • Zhen Huang,
  • Zhenyu Dai,
  • Junjie Lai,
  • Miao Yu

摘要

The Magnetorheological Elastomer (MRE)-based intelligent isolator exhibits excellent vibration attenuation performance on precision machining or measurement platform under time-varying excitation. However, addressing the time-varying delay in vibration control systems remains a challenge, as it can degrade vibration attenuation or even amplify vibrations. To address the issue, this paper proposes a novel adaptive time delay compensator(ATDC) to eliminate the phase difference between control signal and response signal induced by time-varying delay. Firstly, the time delay in the MRE fuzzy control system is analyzed under various vibration excitations. Based on this analysis, the optimal delay compensation law dependent on excitation frequency is determined based on time delay compensation theory. Subsequently, by establishing a correlation between the frequency and the amplitude ratio of excitation to response through a passive model, the frequency is effectively "eliminated." This results in an ATDC law that relies solely on the excitation and response amplitudes, enabling it to adapt the varying frequency without the need for identifying the specific excitation frequency through the Fast Fourier Transform (FFT) method. Finally, the effectiveness of the proposed ATDC is verified through experiments involving time-varying vibrations from 45 to 65 Hz and 0.5 to 3.0 m/s2. Experimental results indicate that ATDC can improves better control performancewith lower energy consumption compared with system without ATDC.