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Technology for Prediction of Contactor Noise for Electric-powered Vehicle Batteries

Article of Honda R&D Technical Review Vol.33 No.1

Summary

Electric-powered vehicles have a high-voltage battery unit mounted in the vehicle body, and the sound made by operation of the electromagnetic contactor inside the unit can be unpleasant for vehicle occupants. A method was created for predicting this noise from the excitation force of the high-voltage battery unit on its own and from the acoustic transmission characteristics of the vehicle body structure. The adoption of component-based transfer path analysis made it possible to separate vibration sources from transfer systems and predict noise in the fully assembled vehicle state by using the load transferred from the stand-alone high-voltage battery unit to the vehicle body side and a transfer function that combines the vehicle body structure transfer and the cabin acoustic transfer. A computer-aided engineering model was also created for predicting the load from the stand-alone high-voltage battery unit based on the load from the junction board, which is a sub-unit of it. This made it possible to predict the excitation force of the high-voltage battery unit at the drawing stage. By means of the above technology, it has become possible to consider noise evaluation in the fully assembled vehicle state at the performance design stage.

Reference

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Author (organization or company)

Akito SHIMOMURA(Honda Motor Co., Ltd.)、Naoki TOYAMA(Honda Motor Co., Ltd.)、Masamichi KAWABE(Honda Motor Co., Ltd.)、Yoshimi SATO(Estech Corp.)

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