基于压力增强的磁流变阻尼器中高频阻尼性能研究  

Study on Medium and High Frequency Damping Performance of Magnetorheological Damper Based on Pressure Enhancement

作　　者：董小闵[1] 晏茂森 于建强[1] 李鑫[1] 宋现宇 邢建伟 DONG Xiaomin;YAN Maosen;YU Jiangqiang;LI Xin;SONG Xianyu;XING Jianwei(School of Mechanical and Vehicle Engineering,Chongqing Univ.,Chongqing 400044,China;Beijing Institute of Space System Engineering,Beijing 100076,China)

机构地区：[1]重庆大学机械与运载工程学院,重庆400044 [2]北京宇航系统工程研究所,北京100076

出　　处：《湖南大学学报（自然科学版）》2022年第6期16-24,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52075056);重庆市博士后研究项目特别资助(XmT2019006);中央高校基本科研业务费专项项目(2018CDGFJX0023)。

摘　　要：为减小磁流变阻尼器在微振幅中高频激励下磁控耗能能力降低带来的影响,提出采用增加磁流变液初始压强来增加工作压强的方法以改善磁流变阻尼器在中高频激励下的磁控耗能能力.基于磁流变液的可压缩特性,构建磁流变阻尼器的力学模型,分析中高频时工作压强对阻尼力的影响;设计加工了无补偿装置的单杆直线液体弹簧式磁流变阻尼器,通过实验测试验证力学模型的准确性.正弦激励下的实验结果表明:增加磁流变阻尼器工作压强可以使阻尼曲线更饱满,且工作压强较高时,磁流变阻尼器耗能能力明显优于工作压强较低时磁流变阻尼器耗能能力;根据实验结果发现:相比于初始压强为标准大气压,当初始压强为5 MPa时,阻尼增幅最大为31.3%,耗能增幅最大为78.5%;此外,增加工作压强后工作区域磁场更容易饱和,等效刚度和等效阻尼系数都会随着工作压强的增加而上升.In order to reduce the effect of reduction of the magnetron energy dissipation capacity of the magnetorheological damper under a micro-amplitude,medium and high frequency excitation,this paper proposes a method to increase the working pressure by increasing the initial working pressure of the magnetorheological fluid in order to improve the magnetorheological damper energy dissipation capability under a medium and high frequency excitation.Based on compressible characteristics of magnetorheological fluids,a mechanical model of magnetorheological damper was constructed. The effect of working pressure on the damping force at medium and high frequency excitation was analyzed. A single rod linear liquid spring-type magnetorheological damper without a compensation device was designed and processed,and the accuracy of the mechanical model was verified through experimental tests. The experimental results under sinusoidal excitation showed that:increasing the working pressure of the magnetorheological damper can make the damping curve much fuller. When the working pressure is higher,the energy consumption capacity of the magnetorheological damper is significantly better than that of the magnetorheological damper when the working pressure is lower. According to the experimental results,it is also found that compared with the initial pressure of standard atmospheric pressure,when the initial pressure is 5 MPa,the maximum damping is increased up to 31.3%. The maximum increase in energy consumption is 78.5%. In addition,by increasing the working pressure,the magnetic field in the working area is more likely to saturate. The equivalent stiffness and equivalent damping coefficient are increased with the increase of the working pressure.

关 键 词：磁流变液 磁流变阻尼器 中高频 压力增强 可压缩特性 

分 类 号：TH113.1[机械工程—机械设计及理论]