Abstract
Automobile brake squeals have always been a major problem for the auto industry because of the high pitch and intensity level. Currently, the vehicle brake squeal diagnostics is carried out by using a scanning laser synchronized with squeals. If squeals occur at multiple frequencies, then filtering must be used so that the scanned out-of-plane vibration corresponds to a single frequency. This process is very time consuming, especially when squeals contain multiple frequencies. Moreover, the results thus obtained are valid at measurement locations only. In this paper, we use Helmholtz equation least-squares (HELS)-based near-field acoustical holography to reconstruct squeal sounds via a custom-designed 48-microphone array conformal to the shape of a brake assembly. This microphone array allows for taking a snapshot of 3D acoustic image on the surface of the brake assembly and produces 3D mappings of all acoustic quantities. In particular, we can identify the out-of-plane vibration modes that are responsible for squeals and reveal the locations where squeals originate from. There is no need for synchronization and filtering. The whole measurement can be done in seconds, and the reconstructed results are valid not only on source surface, but also in the field. [Work supported by NSF.]
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