Browse Publications Technical Papers 2018-01-1530

Localization of BSR Noise Source Using the Improved 3D Intensity Method 2018-01-1530

A three-dimensional sound intensity probe is employed to identify the components generating the buzz, squeak, and rattle (BSR) noise in the vehicle interior. The 3D intensity probe is advantageous compared to the beamforming or TDOA method: compact overall size, small number of microphones, low-frequency detection capability. Although the 3D sound intensity has been not popular due to various bias errors, but the recent error compensation method is adopted in the work, improving the estimate precision substantially. The filtered cross-power spectral density is used to calculate the intensity avoiding the spectral bias error, and an error map for spatial angles is used to compensate the difference in directivity index around the microphone array. An intensity probe with an even microphone spacing of 30 mm in tetrahedral arrangement is selected for the source localization. The car interior space is a dead room in terms of absorption, but the reverberation effect cannot be neglected due to small space. Experiments are conducted to estimate the artificially generated noise representing the characteristics of each buzz, squeak, rattle noise. The estimated bearing angle of the noise source is superimposed with the image captured by the omni-directional camera. Various source positions are selected such as the instrument panel, door hinge, seat, etc., and the sound levels of source and background are changed. It is found that the source localization error is less than 2°, in general, which opens the possibility of using this improved 3D intensity probe for the localization of BSR noise source in real time.


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