论文部分内容阅读
道岔区复杂的轮轨接触状态决定了其轮轨力特性与一般线路相比存在较大的差异。利用空间轮轨接触几何关系理论和Hertz非线性弹性接触理论,研究道岔区车轮与同侧并列的2股钢轨同时接触的2点接触问题。依据2点接触时轮轨弹性压缩量计算每一接触点上的轮轨力,由此确定车辆侧向和直向通过时的轮轨2点接触范围以及轮轨力转移和分配特性。结果表明:2股钢轨上轮轨力转移和分配特性不仅与钢轨外形、轨顶高度和宽度有关,而且与车辆过岔方式有关;考虑轮轨2点接触后的计算方法,消除了单点接触轮轨力计算中轮轨接触点从一股钢轨转移到另一股钢轨上时引起的轮轨力突变,使得轮轨力变化更为平顺和真实。
The complicated wheel-rail contact state in turnout area determines that the wheel-rail force characteristic has big difference compared with the general line. Based on the theory of spatial relationship between wheel and rail contact and Hertz nonlinear elastic contact theory, the two-point contact problem of simultaneous contact between two wheels in turnout area and two parallel rails on the same side is studied. The wheel-rail force at each contact point is calculated based on the amount of elastic reduction of the wheel and rail during 2-point contact, thereby determining the 2-point contact range of the wheel and rail as well as the wheel-rail force transfer and distribution characteristics during vehicle lateral and straight passage. The results show that the transfer and distribution of wheel-rail forces on the two rails are not only related to the rail profile, the height and width of the rail top, but also to the way of vehicle turnout. Considering the method of calculating wheel-rail contact after 2-point contact, In the calculation of wheel-rail force, the wheel-rail force caused by the wheel-rail contact point transfer from one rail to another rail suddenly changes, which makes the wheel-rail force change more smooth and true.