Impact dynamic behavior of radial throttling MR mastic buffer

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (17) : 177-184.

FU Benyuan1, ZHANG Xianming2, LIU Chi1, LI Zhuqiang2, LIAO Changrong3

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Abstract

To improve the adaptive adjustment ability of automobile buffer system, a controllable buffer with the combination of corrugation crush and radial flow throttling is proposed in this paper. The corrugated tube is used to replace the traditional crash box and connected in series with the magnetorheological (MR) valve, which is filled with MR cement with excellent suspension stability. For improving the utilization rate of magnetic field and reducing the axial length of buffer, a radial channel is established in MR valve. In the radial channel, the flow direction of cement is completely perpendicular to the direction of magnetic field. Based on the Herschel Bulkley (HB) constitutive model, the relationship between flow throttling pressure drop and impact velocity is deduced. Considering the influence of minor losses, HB-minor losses (HBM) dynamic model is constructed. Further, the pressure drop caused by inertia effect is quantitatively analyzed. At last, the HBM-inertia (HBMI) model is constructed. The buffer is made and the impact tests are carried out. The proportion of radial pressure drop in the total pressure drop of damping channels is analyzed. The influence of minor losses on pressure drop is analyzed. To further improve the controllability, the minor losses optimization regions are put forward. Comparing the theoretical and experimental buffer force curves, the influence of inertia effect on buffer force is analyzed in four stages. It is found that inertia effect mainly affects buffer force in peak stage and end stage. The theoretical models are compared with the experimental peak force and dynamic range. Then the relative error of the dynamic range of the theoretical models are further obtained. The results show that the HBMI model is more accurate in predicting the dynamic behavior of MR cement buffer.
Key words: magnetorheological cement buffer; radial throttling; dynamic behavior; minor losses; inertia effect

Key words

magnetorheological cement buffer / radial throttling / dynamic behavior / minor losses / inertia effect

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FU Benyuan1, ZHANG Xianming2, LIU Chi1, LI Zhuqiang2, LIAO Changrong3. Impact dynamic behavior of radial throttling MR mastic buffer[J]. Journal of Vibration and Shock, 2022, 41(17): 177-184

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