Research on Longitudinal Leveling Measurement Method Based on Three-point Chord Measurement method
Tamping machine is the main models of large-scale railway maintenance machinery.Tamping machine correct the geometric parameters of the track through lifting,shifting,and tamping operations,so that the direction(alignment),horizontal level(cross level),and vertical height(longitudinal level)of the track reach or approach the design level.At present,the method of longitudinal leveling measurement for large railway maintenance machinery tamping car is generally based on three-point chord measurement,which usually converts the data of angle changes into elevation values to guide the operation of tamping car.However,there is a certain deviation in this method when the lifting volume is large.This paper conducts theoretical analysis and research based on the design scheme of the measurement sensor and the deviation caused by the chord line in the position of the sensor swing rod,and recommends an optimal theoretical model for the front position of the measurement sensor swing rod.