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Time-delay analysis of a magnetorheological elastomer actuator for semi-active control

Time delay in the semi-active vibration control system will lead to unsatisfied control results. This paper studies the time delay problem of semi-active vibration control system with MRE actuator (isolator). The response time of output force generated by MRE actuator is analyzed in theory, which is consists of time delay produced by the isolator mechanical structure and MRE material, and the response time of the coil in MRE actuator. The response times are obtained by experiment under various step voltage and fixed displacement excitation. Experimental results show that the isolator mechanical structure is main effective factor to system response time, coil structure has a limited influence, and displacements and pulse-width modulated (PWM) voltage values have no influence on response time.