Dynamic Behavior of Magnetorheological Energy Absorber under Impact Loading

doi:10.3901/JME.2019.01.072

Abstract

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

CLC Number:

O373

SHOU Mengjie, LIAO Changrong, YE Yuhao, ZHANG Honghui, FU Benyuan, XIE Lei. Dynamic Behavior of Magnetorheological Energy Absorber under Impact Loading[J]. Journal of Mechanical Engineering, 2019, 55(1): 72-80.

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