There are tWo kinds of ways to measure the railway vehicle wheel tread
irreguIarities. One is the static measurement that uses the mechanical ruler,
electro-testing aPparatus and device equipped with CCD. Another is the dgnamic
measurement that mainly depends on the technology of ultrasonic and CCD. In this
thesis, We use an original method called the Collision Vibration Energy
Transmission Time-Difference Analysis System for the automatic d...