Wheel/Rail Contact Force Measurement with Frequency Response Function Matrix of Axle Box

Abstract

The derailment coefficient is based on the (L/V) ratio where L is the lateral force and V is the vertical force acting on the wheelset Japan Railway Technical Research Institute(RTRI) measure rail/wheel contact force with a special wheelsets equipped with strain gauges Considering wireless transmission use Arduino strain gauge modules and Zigbee to measure rail/wheel contact force in this study But the deformation of the wheel is too small The Arduino strain gauge can not deteact any stain Therefore using Frequency Response Function(FRF) to measure rail/wheel contact force FRF is generally measured by the inputs as excitation forces using impact hammer and outputs as accelerations using accelerometers In order to verify the accuracy of the FRF method simulate the wheel-rail contact force by SIMPACK in this study The comparison results show that the vertical force deviation is between 5% and 7% the average deviation is 6 17% and the lateral force deviation is between 0 4% and 25% the average deviation is 15 94% The deviation value is influenced by the equipment noise processing and the correctness of frequency response function It is expected that this method can be applied to actual vehicle measurements for track safety in the future

Date of Award	2020
Original language	English
Supervisor	Chen-Ming Kuo (Supervisor)