Research on the Dynamic Characteristics and Nonlinear Mechanical Model of the Liquid Rubber Composite Rotary Arm Joint

doi:10.3901/JME.260197

Abstract

Abstract: In order to investigate the dynamic characteristics of the liquid rubber composite rotary arm joint, establish a nonlinear mechanical model for the liquid rubber composite rotary arm joint of railway vehicles and explore the impact of the liquid rubber composite rotary arm joint on the dynamic performance of the vehicles. Based on the linear theory, the analysis of the frequency response characteristics of the liquid rubber composite rotary arm joint is conducted, and the mechanism of frequency-variable stiffness is investigated. A nonlinear mechanical model of the liquid rubber composite rotary arm joint is established, taking into account the nonlinearity of the dynamic characteristics of the rubber main spring, the nonlinearity of the volumetric compliance of chamber, and the nonlinearity of fluid damping. Bench tests of the liquid rubber composite rotary arm joint under various frequencies and amplitude displacement excitations are conducted to verify the accuracy of the established mechanical model. The co-simulation model of the liquid rubber composite rotary arm joint and vehicle dynamics is established to analyze the impact on the vehicle's dynamic performance. The results show that the mutual coupling effect between the rubber main spring and the hydraulic mechanism endows the liquid rubber composite rotary arm joint with frequency dependency and amplitude dependency；the established nonlinear mechanical model can accurately describe the frequency-dependent and amplitude-dependent characteristics of the liquid rubber composite rotary arm joint；vehicles equipped with liquid rubber composite rotary arm joint have a higher nonlinear critical speed, better curve passing capabilities and curve passing safety compared to those with traditional rubber rotary arm joint.

Key words: liquid rubber composite rotary arm joint, nonlinear mechanical model, frequency-dependent characteristics, amplitude-dependent characteristics

CLC Number:

U270

LI Xuyang, DAI Liangcheng, CHI Maoru, ZHAO Minghua, ZHOU Di. Research on the Dynamic Characteristics and Nonlinear Mechanical Model of the Liquid Rubber Composite Rotary Arm Joint[J]. Journal of Mechanical Engineering, 2025, 62(6): 337-345,358.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260197

http://www.cjmenet.com.cn/EN/Y2025/V62/I6/337

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