车辆双筒式减振器热物性影响规律分析  

Analysis of Thermo-physical Properties on Influence Rules of Vehicular Twin-tube Shock Absorber

作　　者：么鸣涛[1] 顾亮[1] 管继富[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《四川大学学报（工程科学版）》2011年第2期241-246,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(1030020220707)

摘　　要：为了探讨车辆减振器热物性对其温升的影响规律,建立了某车辆双筒液压充气减振器的热流量传递模型和物理传热模型,推导其导热、对流换热及辐射换热方程,通过热力学第一定律建立减振器热力学模型。利用迭代算法计算出此减振器达到热平衡时的温度和工作时间,并通过台架试验验证了建模的正确性,分析了减振器热物性对其温升的影响规律,最后进行了相关的灵敏度分析。研究结果表明减振器的4种热物性参数:油液密度、油液导热系数、油液比热容、缸体辐射发射率影响其温升特性,而缸体导热系数这一热物性参数对其温升特性无影响。In order to investigate the influence rules of thermo-physical properties of the shock absorber on its temperature rising,the transmission model of heat transfer rate and physical heat-transfer model of a certain vehicular twin-tube hydraulic gas-charged shock absorber were built and the equations of heat conduction,heat convection,as well as radiation heat transfer were derived.Furthermore,its thermodynamic model was established by the first law of thermodynamics.The temperature and the work time when the shock absorber had reached the thermal equilibrium were calculated by iterative algorithm,and the correctness of modeling was verified by performing the rig test.The effects of thermo-physical properties on its temperature rising were analyzed,moreover the associated sensitivity analysis was carried out finally.The results showed that four kinds of thermo-physical properties of the shock absorber,i.e.,oil density,oil thermal conductivity,oil specific heat and radiation emissivity of the cylinder wall affect its temperature rising characteristics,while the cylinder wall thermal conductivity does not influence the characteristic.

关 键 词：减振器 热物性 迭代算法 热平衡 

分 类 号：U463.33[机械工程—车辆工程]