摘要
建立包含多点接触轮对振动方程的车辆—轨道系统动力学模型,对轮轨多点接触计算和判定新方法—迹线极值法进行车辆曲线通过验证,给出曲线通过接触点在车轮踏面上位置、轮轨接触点数和轮轨法向力。结果表明,迹线极值法能够解决轮轨多点接触问题并获得准确的轮轨多点接触几何参数和系统振动特性;当发生轮缘根部和轮缘两点接触时,采用多点接触方法得到的结果比采用单点接触方法得到的结果更为合理可信,当不发生轮缘根部和轮缘两点同时接触时,多点接触法与单点接触法得到的结果几乎完全一致;与新用车轮踏面相比,测试得到的磨耗后车轮踏面在其名义直径位置凹陷区域附近容易形成踏面两点接触。证实了轮轨多点接触新方法的正确性和有效性。
A vehicle-track system dynamic model, including multipoint contact wheelset vibration equations, is built to carry out curve negotiation verification of a new calculation and decision method for wheel-rail multipoint contact─trace line extremum method. The position of curve negotiation contact points on the wheel tread, the number of wheel-rail contact points and the wheel-rail normal force are presented. The result shows that the trace line extremum method can solve the wheel-rail multipoint contact problem and obtain the accurate geometric parameters of wheel-rail multipoint contacts and the system vibration characteristics. When two-point contact of wheel flank root and wheel flank occurs, the result obtained by using multipoint contact method is more reasonable and reliable than that by using single-point contact method. If no simultaneous two-point contact of flank root and flank, the results by multipoint contact method and by single-point are almost in full agreement. Compared to the new wheel tread, the worn tread is easy to form two-point contact nearby the depression area of the nominal diameter position of wheel tread. The correctness and effectiveness of the new method are verified.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第16期1-7,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(50875019)
西南交通大学牵引动力国家重点实验室开放基金(TPL0805)资助项目
关键词
轮轨多点接触
动态曲线通过
轮缘接触
踏面磨耗
Multi-point contact Dynamic curve negotiation Flange root contact Tread wear
