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

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.

Key words:roller rig; wheel/rail interaction force; measure; intrumented wheelset