Research on the detecting method of CRH wheel flat at low speed

As the key critical load-bearing parts of the high-speed EMU, the quality of wheel set has diiect impact on the safety. Now in China, equipment for detecting the wheels quality is usually installed in the CRH entrance line with CRH passing in low speed. As one of the important contents of wheel quality detection, whether wheel flat can be timely and accurate detected or not, is especially important. Although there are lots of methods for wheel flat detection in low speed, each one has its advantages and disadvantages. This paper introduces the contact method which is widely used in China as the quantitive detection for CRH wheel. But there is a key disadvantage which makes this equipment fails in some condition. To solve the problem, a new method is raised, which uses the wheel flat detection lever installed outer the rail and combines the advantages of the inner and outer. The new method makes this application in real function and will have a great reference value.