重庆大学学报2024，Vol.47Issue(8)：18-25,8.DOI:10.11835/j.issn.1000.582X.2024.08.002
多级线圈驱动的磁流变弹性体夹层梁结构设计与实验
Design and experimentation of magnetorheological elastomer sandwich beam structure driven by multistage coil
摘要
Abstract
Beam structures are prevalent in various engineering applications,such as building bridges and aircraft wall panels. Due to their low stiffness and low damping characteristics,these structures are prone to low-frequency large vibrations,resulting in structural fatigue or damage. To solve the problems of fixed structural parameters and poor adaptability of traditional sandwich beams,this study proposes a magnetically controlled intelligent sandwich beam structure based on magnetorheological elastomers. This structure can adaptively adjust its stiffness and damping according to changes in external excitation under the influence of a magnetic field,effectively suppressing vibrations. Firstly,to overcome the challenges of difficult magnetic field application and significant magnetic field attenuation in the air for traditional sandwich beams,a magnetron sandwich beam structure driven by a built-in multistage coil is proposed. Secondly,the vibration damping mechanism of the device is analyzed based on the material properties of magnetorheological elastomers. Then,the magnetic field simulation of the magnetron sandwich beam using COMSOL shows that the first-order natural frequency of the sandwich beam changes from 6.22 Hz to 9.16 Hz under a 3 A current,and the damping ratio increases by 64.4％,verifying the variable stiffness and damping characteristics of the magnetorheological elastomer sandwich beam. Finally,the broadband vibration isolation performance of the magnetron sandwich beam driven by a multistage coil is verified through multiple frequency excitation experiments.关键词
磁流变弹性体/夹层结构/阻尼比/振动分析Key words
magnetorheological elastomers/sandwich structure/damping ratio/vibration analysis分类
通用工业技术引用本文复制引用
王伟,高凡,段西蓉,李旺,浮洁..多级线圈驱动的磁流变弹性体夹层梁结构设计与实验[J].重庆大学学报,2024,47(8):18-25,8.基金项目
国家自然科学基金资助项目(51875056).Supported by National Natural Science Foundation of China(51875056). （51875056）
