Development of a method for measuring noise/vibration sensitivity to tire contact patch inputs

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Development of a method for measuring noise/vibration sensitivity to tire contact patch inputs

Maruyama, Shinichi

A method has been developed that uses the principle of structural or structural-acoustical reciprocity to measure the vibration and noise transfer functions of the vehicle body induced by road surface inputs to the tires. This method measures the constraint force produced at the tire contact patch when excitation is applied from the conventional evaluation point in the cabin. The results of this study are summarized below: (1) The development of this method now facilitates simple and efficient measurement of the distribution of the vibration and noise transfer functions within the lire contact patch and the transfer functions in relation to inputs in the rotational direction, aspects that were difficult to measure previously. (2) Based on the measured results, it was found with regard to interior noise that there is a wide range of frequency bands in which the transfer functions displayed opposite phases within the lire contact patch. (3) There are several issues that remain to be addressed in this reciprocity method, including the problem of the excitation amplitude. Nonetheless, the application to interior noise of passenger car presented here clearly shows that it is a useful experimental method capable of measuring vehicle body vibration and noise characteristics that have not been measurable with the conventional shaker excitation method.