Abstract
Surface waves are produced by hammer impact on the rim of a wheel. They travel around the wheel tread making one complete traverse of the circumference every millisecond. If a receiver is located close to the impact point, the signal shows a series of arrivals at millisecond intervals. If a crack is present in the surface, there will be an extra impulse received in less than a millisecond. Both contacting accelerometer and noncontacting microphones can be used to detect the signals. The signals were digitized and processed in time, frequency, and frequency domains and the presence of the crack can be seen most clearly by filtering the cepstrum to remove all but the initial reflection from the crack. [Work supported by ARE.]
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