Model-free fuzzy control of a magnetorheological elastomer vibration isolation system: analysis and experimental evaluation

Abstract

This paper addresses the problem of micro-vibration control of a precision vibration isolation system with a magnetorheological elastomer (MRE) isolator and fuzzy control strategy. Firstly, a polyurethane matrix MRE isolator working in the shear-compression mixed mode is introduced. The dynamic characteristic is experimentally tested, and the range of the frequency shift and the model parameters of the MRE isolator are obtained from experimental results. Secondly, a new semi-active control law is proposed, which uses isolation structure displacement and relative displacement between the isolation structure and base as the inputs. Considering the nonlinearity of the MRE isolator and the excitation uncertainty of an isolation system, the designed semi-active fuzzy logic controller (FLC) is independent of a system model and is robust. Finally, the numerical simulations and experiments are conducted to evaluate the performance of the FLC with single-frequency and multiple-frequency excitation, respectively, and the experimental results show that the acceleration transmissibility is reduced by 54.04% at most, which verifies the effectiveness of the designed semi-active FLC. Moreover, the advantages of the approach are demonstrated in comparison to the passive control and ON-OFF control.

Investigation on Effects of Chain Extenders and Cross-linking Agents of Polyurethane Elastomers Using Independent Building Vibration Isolation Sensor

“…(20)(21)(22) However, the performance analysis of vibration isolation has mainly been by software simulations. (23)(24)(25)(26) Moreover, no detailed information has been reported on the relationship between the internal structure of PUEs and their vibration isolation characteristics.…”

Active Hybrid Control Algorithm with Sky-Hook Damping and Lead-Lag Phase Compensation for Multi-DOFs Ultra-Low Frequency Active Vibration Isolation System

“…At the same time, with the PNSP structure employed in this paper, it can produce the effect that the natural frequency is reduced to ultra-low frequency 1.15 Hz∼1.20 Hz (in [12] it is 3 Hz and in [13] it is 4.96 Hz), and the amplitude of the resonance peak and other bandwidths is greatly decreased by 23.58 dB∼29.17 dB (in [14] it is 10 dB∼ 20 dB). Meanwhile, the vibration attenuation rate in 110 Hz is 98% (in [15] it is 54.04%). And the active effective bandwidth is extended to the midfrequency region of 0.23 Hz∼45.74 Hz (in [12] it is 0.3 Hz∼30 Hz).…”

Dynamic Mechanical Hysteresis of Magnetorheological Elastomers Subjected to the Cyclic Loading and Periodic Magnetic Field

“…As an intelligent engineering material, the MRE exhibits excellent magnetic-control properties as well as potentials for applications in the fields of noise reduction, vibration attenuation, smart sensing, electromagnetic shielding, etc. (Kashima et al, 2012;Hoang et al, 2013;Xing et al, 2015Xing et al, , 2016Fu et al, 2016;Wang et al, 2016;Yu M. et al, 2016;Qi et al, 2018a). For the magnetorheological (MR) materials, the magnetic particles are inclined toward columns paralleled to the magnetic orientation.…”