工程车辆油气悬挂温度场影响因素分析

油气悬挂内部物理状态对其输出特性具有重要影响,其中温度场的变化是不可忽略的重要因素。根据油气悬挂的结构特点,搭建力学模型;基于传热学理论,考虑了缸筒和活塞杆的热容对油气悬挂温升的影响,运用集中参数热模型法建立了油气悬挂的热力学模型,并将其与油气悬挂的非线性输出力数学模型相结合,得出了油气悬挂温度变化的规律。搭建油气悬挂周期激励试验台,通过油气悬挂热力学模型的计算结果和油气悬挂周期性激励加载的试验结果都表明:油液是影响悬挂温升的主要内部因素,而且在外界激励存在的情况下,由于与外界环境的热量交换,悬挂的温度会逐步达到一个平衡的状态;同时试验结果中输出力的变化趋势表明:悬挂系统温度变化对悬挂输出力的影响是不能忽略的,在实际中应加以重视。

Analysis of Influencing Factors on Temperature Field of Hydro Pneumatic Suspension of Engineering Truck

The inside physical state has an important impact on the output characteristics of the hydro pneumatic suspension, wherein the change in temperature field is not negligible. According to the structural characteristics of the suspension, the mechanical model is built. Based on the heat transfer theory and with consideration of the impact of the heat capacity of the cylinder and piston rod on the suspension temperature rise, the thermodynamic model of the hydro pneumatic suspension was built by using lumped parameter thermal model method. The thermodynamic model and the non-linear output force model were combined to get the variation rules of the hydro pneumatic suspension temperature. The periodically excited test bench of the suspension was built. The loading test results and the thermodynamic model calculations show that: The oil is the main internal impact factor of the suspension temperature rise. Under the external incentives, due to the heat exchange with the external environment, the suspension temperature will gradually reach a state of equilibrium. While the trend of change in test results of the output power shows the effect of the suspension system of temperature change on hanging output force can not be ignored, and should be paid attention in the practical application.