多级线圈驱动的磁流变弹性体夹层梁结构设计与实验OA北大核心CSTPCD
Design and experimentation of magnetorheological elastomer sandwich beam structure driven by multistage coil
梁结构存在于建筑桥梁、飞机壁板等多种工程中,由于其低刚度、低阻尼特性,易产生低频大幅振动,造成结构疲劳损伤甚至破坏.针对传统夹层梁的结构参数固定、自适应性差等问题,提出基于磁流变弹性体的磁控智能夹层梁结构,能够在磁场作用下根据外界激励的变化,自适应调整结构的刚度和阻尼,实现振动的有效抑制.首先,针对传统夹层梁磁场施加困难、在空气中磁场衰减大等问题,提出内置多级线圈驱动的磁控夹层梁结构;其次,基于磁流变弹性体材料特性,分析了器件减振机理.最后,通过COMSOL仿真对磁控夹层梁进行磁场仿真,发现在3 A电流的作用下夹层梁的一阶固有频率由6.22 Hz变为9.16 Hz,阻尼比增大64.4%,验证了磁流变弹性体夹层梁的变刚度、变阻尼特性.通过多个频率激励实验验证了内置多级线圈驱动的磁控夹层梁的宽频隔振性能.
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.
王伟;高凡;段西蓉;李旺;浮洁
重庆大学光电工程学院,重庆 400044||重庆大学光电技术及系统教育部重点实验室,重庆 400044
磁流变弹性体夹层结构阻尼比振动分析
magnetorheological elastomerssandwich structuredamping ratiovibration analysis
《重庆大学学报》 2024 (008)
18-25 / 8
国家自然科学基金资助项目(51875056).Supported by National Natural Science Foundation of China(51875056).
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