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.

Research on the vibration transmission characteristics of quasi-periodic impedance layered structure constructed by magnetorheological fluid

“…Comparing figures 13 and 12, it can be seen that in these two figures, the overall variation trend of the VLD curve with quasi-periodic impedance distribution patterns is similar, that is, when the number of layers N is 18, the comparison between periodic impedance structure in literature [29] and different quasi-periodic impedance structures demonstrates a similar variation trend with figure 12 (N = 12). This means that when N is 18, there still exist quasi-periodic impedance layered structures whose attenuation effect on vibration is better than that of periodic pattern in a certain frequency ranges.…”

“…For another, this work further compares the results of different quasi-periodic impedance layered structures with the results obtained from our previous research on periodic impedance structure [29]. When the magnetic induction intensity B is 40 mT, the total number of layers N is 18, the VLD curves of different quasi-periodic impedance layered structures and the results from literature [29] are shown in figure 13.…”

“…The different impedance distribution patterns can be flexibly modulated by using this impedance modulation device, which contributes to comprehensively investigating the vibration transmission properties under different structural forms with different parameters. In our previous research [29], the propagation behavior of elastic waves in impedance periodic structure built by MR fluid had been studied, while the existence of irregularity in periodic model will inevitably have a certain influence on vibration transmission. Thus, this work will further investigate the vibration transmission properties of quasi-periodic impedance layered structures with special sequences, and compare them with that of periodic impedance mode, so as to discuss the effects of the quasi-periodic patterns on the vibration transmission.…”

Study on the influence of composition parameters of magnetorheological fluid on its vibration transmission characteristics

“…Researchers have recently conducted many studies on the vibration transfer characteristics of MRF. Zhao et al [7] investigated MRF's energy storage and loss modulus under highfrequency excitation. They concluded that the energy storage modulus of MRF increases linearly with frequency.…”

Torque Characteristics Analysis of a Magnetorheological Brake with Double Brake Disc

“…Magnetorheological (MR) fluid, which consists of carbonyl iron powder and carrier liquid, is a sort of intelligent industrial material [1]. MR fluid exhibits its unique rheological properties, that is, when exposed to an external magnetic field, it can respond quickly within milliseconds and change from the fluid state to a solid-like state, thus generating the shear stress required for work [2][3][4][5]. The shear stress can be reversibly and consecutively adjusted by changing applied current to coordinate the internal magnetic flux density [6].…”