1∶5滚动实验台轮轨力连续测量系统

Wheel/Rail Interaction Forces Continuously Measuring System for 1∶5th Scale Roller Rig

摘要:

轮轨作用力是评价铁道车辆安全性的主要指标.针对1∶5小比例滚动实验台,开发了轮轨力连续测量系统.首先使用有限元分析和应变实验,得到小比例轮对的最佳测点位置.根据测点的应变输出特性,提出小比例滚动台的轮轨力连续测量方案:轮轨横向力采用轮测法测量,再结合轴测法测量轮轨垂向力.在横向力测量中,一侧车轮采用简易余弦桥,另一侧车轮采用直流桥.研制了小比例测力轮对,静态试验结果说明简易余弦桥的测试精度较高.论文最后给出了1∶5滚动实验台轮轨力的测量结果.

Abstract:

The safety of the railway vehicle is mainly evaluated by the wheel/rail interaction forces.A wheel/rail interaction forces continuously measuring system for a 1∶5th scale roller rig in Tongji University is developed.The finite element method analysis and experiment studies are carried out to find the desirable positions of strain gauge on 1∶5th scale wheelset.Then an instrumented wheelset for continuously measuring wheel/rail interaction forces of 1∶5th scale roller rig is developed.The lateral forces are measured directly from the strain gauges on the wheel plate.A simple cosine strain gauges bridge and a direct current strain gauges bridge are practised on left and right wheel respectively.The wheel/rail interaction vetical forces are indirectly calculated according to the axle bend moments and lateral forces on wheels.The output characteristics of all strain gauge bridges are obtained through static calibration and the prcision of cosine gauges bridges is better than that of direct current gauges bridge.Finally the wheel/rail interaction forces of 1∶5th roller rig are given by this measuring system.