An Optical Method Of Detecting The Wheel Treads

With the rapid development of rail transport, especially the improving of speed and loading, how to ensure the safety of train is the primary consideration. The Wheel is one of the most important rolling components in the vehicle. The problem that how to measure the fault of the tread profile is concerned all along and Perpetual studied and improved. That is because the irregularities of tread profile are the key factor of influencing the safety and stabilization of running.Through studying a large number of existing domestic and abrasion test methods, and analyzes their advantages and disadvantages, this paper advanced a new method of detecting the wheel tread. The principle of the project is that the wheel tread will generate the impact load that induce deformation of rail when the train running. Through detecting the deformation of rail, the defect of the wheel tread can be detected.Firstly, this paper describes the principle and components of the system about the new optical method. Then introduces the basic principle of the method—Vehicle-Track Vertical Coupling Dynamics, listing a variety of vehicle and track coupling model and analyzing the response of the wheel/rail vertical dynamic forces caused by the defect (e.g.:flat wheels, eccentric wheels); After that, the paper introduces the structure and installation of two platform (based on CCD and PSD-based platform), and analyzes the measured data of the two kinds of platform. Especially analyzes the data of PSD platform, including the date of eccentric wheel and flat wheel.Finally, a device based on PSD platform was installed on the railway of ChongQing—ChengDu. Using this device detect bullet train, then according the detect result check the defect on the wheel, sequentially demonstrate the exactitude of the equipment.