A parametric thermodynamic model for the hydro-pneumatic spring of tracked vehicle is established to explore the mechanism of heat generation of hydro-pneumatic spring during working process.The damping indicator characteristics of hydro-pneumatic spring are numerically fitted through test data acquisition,and a mathematical expression of piston velocity-damping force is obtained by data fitting.Based on the analysis of the heat transfer path and characteristics of hydro-pneumatic spring,a thermal resistance network model of hydro-pneumatic spring is established,and the temperature changes of two working medias of hydro-pneumatic spring are calculated.The calculated results of thermodynamic model for the hydro-pneumatic spring are verified by test.The results show that the work done by the damping force is the main heat source for the temperature rise of hydro-pneumatic spring.Under the same working condition,the oil temperature rises faster than the gas temperature and the oil equilibrium temperature is higher.The thermodynamic model can accurately calculate the temperature rise of hydro-pneumatic spring in different working medias,and provides a reference for studying the thermo-mechanical coupling dynamics of hydro-pneumatic spring.
关键词
生热机理/能量交换/热阻网络/温度分布/平衡温度
Key words
heat generation mechanism/energy exchange/thermal resistance network/temperature distribution/equilibrium temperature
维普
万方数据