The defects due to wear or improper assembly processes may induce undesirable vibrations that in turn cause mechanical failures. This paper employs Wavelet Transform to analyze the vibration of the pitch motion of the carriage in a precision positioning system. Two accelerometers are attached to the carriage at different locations and the accelerations are used to investigate the vibration of the pitch motion. By using Wavelet Transform, the signal measured from the proposed experimental setup are appropriately processed and used for the diagnosis of the defects. The percentage of the band energy (PBE)is found to be a helpful reference for detecting the abnormal conditions. This method successfully combines the techniques of measurement with the theory of the wavelet analysis in monitoring a precision positioning system. The difference between the results obtained both from the Short-Time Fourier analysis and wavelet analysis is also discussed.

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