Theoretical and experimental investigation on wave propagation in the periodic impedance layered structure modulated by magnetorheological fluid

Abstract

This work aims to investigate the elastic wave propagation in the periodic impedance layered structure filled with magnetorheological fluid. The periodic impedance layered structure with high and low impedance layers is constructed by using the magnetorheological fluid with the controllability of liquid–solid conversion. The principle of the periodic impedance layered structure is presented. The transfer model of elastic wave in the proposed structure is established, and the propagation velocity and attenuation coefficient of elastic wave curves of the periodic impedance layered structures with different distribution modes are obtained. The prototype of experimental setup is designed and fabricated, and the experimental testing of the vibration transmissibility is conducted. The theoretical model is validated by comparing the results with the experimental measurements. The results suggest that appropriate distribution modes and also applied magnetic field are validly showing greater attenuation for elastic wave propagation in the periodic layered structures. Theoretical and experimental studies are conducted to investigate on the vibration transmissibility of the proposed structure, the findings of which contribute to provide guidance for the future vibration isolation platforms of the power systems in aerospace and marine engineering practical applications.