Troubleshooting Research Of High-speed Train Wheels

Railway is an important type of shipping in our country, high-speed train makes the space-time distance shorter mutually. Wheel set, as a unit which could sustain train running, operation condition influences train running directly, so carrying out real-time monitoring and troubleshooting is very important.Based on train test system, the main contents of paper are as follows:(1)Building high-speed train test system. The paper summarizes domestic and overseas research status of rail test bed; analyzes motion mechanism and structure; designs and produces test bed in scale of 1 to 4 based on similarity principle; achieves axle loading variation, lateral and radial force variation and simulating rectilinear motion by driving system, Bogie system and loading system; develops fault diagnosis software to improve operability.(2)Analyzing theory of wheel flat scar troubleshooting. The paper discusses its impact mechanism, summarizes form and frequency character of vibration signal; adopts wavelet analysis and discrete cosine transformation processing test signal; recognises frequency character by envelop analysis and spectrum analysis; carries out fault diagnosis based on comparing frequency character and characteristic frequency.(3)Analyzing theory of roller bearing troubleshooting. Analyze its principle failure mode and frequency character; denoises vibration signal by threshold; decomposes denoised signal into several IMF by EMD; recognises real IMF on correlation; carries out fault diagnosis by comparing frequency character and characteristic frequency with method of Hilbert spectrum of real IMF.The paper has completed troubleshooting by comprehensive application of wavelet analysis, envelop analysis, EMD decomposition and Hilbert spectrum analysis, providing theoretical and technological basis for security detection of train.