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Finite element assessment of the temperature field couple under joule heat and friction heat between a third rail and collector shoe

机译:第三轨与集热靴之间焦耳热和摩擦热下温度场耦合的有限元评估

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摘要

Based on the finite element software COMSOL Multiphysics 4.3b, a temperature field model for an aluminium/stainless steel composite third rail and a copper impregnated carbon collector shoe contact with coupling of joule heat and friction heat was established. A method of coupling the two kinds of heat was developed, the temperature fields were calculated, and the maximum coupled temperature change under different electric current, normal forces, sliding velocities and sliding distances were studied. The results show that the temperature distribution expands around the contact area in a descending tendency at positions closer to the electric contact area and the temperature gradients are higher; the maximum coupled temperature increases with an increase of electric current; with an increase of normal force, the maximum coupled temperature initially decreases then increases; the maximum coupled temperature increases initially then gradually becomes stable with an increase of sliding distance; an optimal normal force range exists in frictional sliding with an electric current, at which the maximum coupled temperature is at its lowest; joule heat and friction heat are competitive with each other. When normal force is lower, the joule heat becomes the main heat source, but when normal force is greater, mechanical friction heat becomes the main heat source.
机译:基于有限元软件COMSOL Multiphysics 4.3b,建立了铝/不锈钢复合第三轨和浸有焦耳热和摩擦热的铜浸渍碳集热靴接触的温度场模型。提出了两种热量耦合的方法,计算了温度场,研究了不同电流,法向力,滑动速度和滑动距离下的最大耦合温度变化。结果表明,在靠近电接触区域的位置,温度分布在接触区域周围呈下降趋势,并且温度梯度较高。最大耦合温度随着电流的增加而增加;随着法向力的增加,最大耦合温度先降低然后升高;最大耦合温度先升高,然后随着滑动距离的增加逐渐稳定。在电流的摩擦滑动中存在一个最佳的法向力范围,在该范围内,最大耦合温度最低。焦耳热和摩擦热相互竞争。当法向力较低时,焦耳热成为主要热源,但当法向力较大时,机械摩擦热成为主要热源。

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