液黏传动摩擦副温度场分布特性的模拟

摘要

In order to reveal the temperature field distribution laws of friction pairs in hydro-viscous drive,the controlled start transmissions of scraper conveyor was taken as the research object.Based on the principle of heat conduction,the three-dimensional instantaneous heat conduction equations of friction pairs were established.The mathematical model of heat flux density was deduced by friction power method.And the convective heat transfer coefficient of friction pairs was determined.The finite element model of temperature field was established in the soft of ANSYS Workbench.The temperature field distribution characteristics in the whole soft start process and the effects of different pressure and relative speed on the temperature field were studied.The results indicate that the friction disk and the steel disk have similar temperature field distribution characteristics.Temperature first rises and then declines along the radial direction,and reaches the maximum near the outer diameter of friction pairs.The temperature of friction pairs increases with increasing pressure and relative speed.The temperature of each rhombus area is higher than that of the surrounding area,which is easy to form hot spots.The temperature of the friction pairs is gradually increased throughout the soft start process,and gets the maximum at the end of the soft start.High temperature area at the contact surface of friction pairs is close to the center.The simulation results of the temperature field provide the relevant theoretical basis for the follow-up of the thermal-structural coupling analysis of friction pairs.%为了揭示液黏传动摩擦副温度场分布规律,以矿用刮板输送机可控启动装置为研究对象,基于热传导原理建立了摩擦副三维瞬时热传导方程,采用摩擦功率法推导了热流密度数学模型,确定了摩擦副的对流换热系数.在ANSYS Workbench中建立了摩擦副温度场有限元模型,分别研究了不同接合压力和相对转速及整个软启动过程中摩擦副的温度场分布特性.结果表明:摩擦片和对偶片具有相似的温度场分布规律,均是沿内径至外径方向先上升后下降,温度最大值出现在接近摩擦副外径处;摩擦副温度随接合压力和相对转速的增大而升高;摩擦片每个菱形区域中心温度高于四周区域,容易形成热斑;整个软启动过程中摩擦副温度逐渐升高,在软启动刚结束时达到最大值,摩擦副接触表面高温区向中心靠近.温度场仿真结果为后续的摩擦副热—结构耦合分析打下了基础,提供了相关的理论依据.