A Monitoring System to Detect the Defect of Railway Vehicle Parts

초록

It is difficult to detect the defect of railway vehicle parts in running condition. But it is possible to detect the defect under parts of railway vehicle if use the microphone-array system. In this paper the sound image of underpart of railway vehicle was obtained by using acoustic holography with microphone array system.(Fig. 1 and Fig. 2) When the vehicle come in/out from maitenance depot, the sound image can be used very effective for condition monitoring on underpart of vehicle.(Fig. 3) This is made by comparing the sound image of target vehicle with the reference sound image of one in normal condition. The vehicle If the defect is detected from the sound image, the vehicle sould be investigated and maintained. This is similar in railway vehicle axle bearing.(Fig. 4) Tthe vehicle with axle bearing of abnormal condition is detected by using array microphone system. In this study, the acoustic holography was introduced and the measurement system was produced. The performance test of measurement system was conducted by using virtual sound source - speaker.