• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (1): 72-80.doi: 10.3901/JME.2019.01.072

• 机械动力学 • 上一篇    下一篇

冲击载荷下磁流变缓冲器的动力学行为

寿梦杰, 廖昌荣, 叶宇浩, 张红辉, 付本元, 谢磊   

  1. 重庆大学光电技术及系统教育部重点实验室 重庆 400044
  • 收稿日期:2018-02-19 修回日期:2018-08-12 出版日期:2019-01-05 发布日期:2019-01-05
  • 通讯作者: 廖昌荣(通信作者),男,1965年出生,博士后,教授,博士研究生导师。主要研究方向为智能材料、器件及系统。E-mail:crliao@cqu.edu.cn
  • 作者简介:寿梦杰,男,1993年出生,博士研究生。主要研究方向为磁流变材料及器件。E-mail:mjshou@cqu.edu.cn
  • 基金资助:
    国家自然科学基金(51575065,11702040)、中国博士后科学基金(2017M620409),重庆市博士后特别资助项目(Xm2017112),重庆留学回国人员创新资助项目(No.cx2017085)。

Dynamic Behavior of Magnetorheological Energy Absorber under Impact Loading

SHOU Mengjie, LIAO Changrong, YE Yuhao, ZHANG Honghui, FU Benyuan, XIE Lei   

  1. Key Laboratory for Optoelectronic Technology and System, Ministry of Education, Chongqing University, Chongqing 400044
  • Received:2018-02-19 Revised:2018-08-12 Online:2019-01-05 Published:2019-01-05

摘要: 传统力学模型很难准确预测冲击载荷下磁流变缓冲器的动力学行为,关键原因之一是未考虑惯性效应和局部损耗、或仅考虑其一。针对此问题,从理论与试验上研究分别考虑惯性效应、局部损耗,以及两者同时作用下的环形通道磁流变缓冲器动力学行为。基于Herschel-Bulkley(HB)本构模型,考虑惯性效应,利用平均惯性效应法,推导出环形通道内磁流变液的平均加速度与活塞杆加速度之间的关系,建立包含惯性效应的HB-Inertia(HBI)模型;考虑局部损耗,利用流体力学的相关理论,建立包含局部损耗的HB-Minor Losses(HBM)模型;综合考虑惯性效应和局部损耗的影响,提出同时包含惯性效应和局部损耗的HB-Inertia-Minor Losses(HBIM)模型。设计并制作一对参数相同的磁流变缓冲器,搭建落锤式冲击试验平台,将该对磁流变缓冲器并联,测试不同冲击速度和电流下的动力学行为。试验结果显示所设计的磁流变缓冲器具有良好的控制效果,且最大缓冲力高达75 kN。将试验结果与理论模型进行比较,发现HBI和HBM模型与试验结果有一定差异,而HBIM模型与试验结果吻合较好,表明惯性效应和局部损耗对缓冲器的力学特性都有影响,其中局部损耗的影响更大。

关键词: 冲击载荷, 磁流变缓冲器, 动力学行为, 惯性效应, 局部损耗

Abstract: Traditional theoretical models are hard to accurately predict the dynamic behavior of the magnetorheological (MR) energy absorbers (MREAs) under impact loading. One of the key issues is that the inertia effect and minor losses are not taken into account, or only one is considered. Hence, the dynamic behavior of MREA with annular channel considering the inertia effect, minor loss and both are theoretically and experimentally studied, respectively. Based on the Herschel-Bulkley (HB) constitutive model, the relationship between the average acceleration of the MR fluid in the annular channel and the acceleration of the piston rod is deduced using average inertia effect method, and an HB model incorporating inertia effect (HBI) model is established. For the minor losses case, an HB-Minor Losses model (HBM) model is obtained via fluid mechanics analysis. At last, an HBIM model is proposed to jointly incorporate both the inertia effect and minor losses. Two MREAs with the same structure design are fabricated, and a drop tower is set up to test the two MREAs placed in parallel at different impact velocities and currents. The experimental results show that the MREAs possess a good dynamic range and the peak MREA force is up to 75 kN. Through comparison between the experimental and theoretical results, the HBIM models are able to better predict the dynamic behavior of the MREA under impact loading compared to HBI and HBM model. Finally, it can be concluded that both minor losses and inertia effect affect the MREA dynamic behavior but the former plays a more important role.

Key words: dynamic behavior, impact loading, inertia effect, magnetorheological energy absorber, minor losses

中图分类号: