Abstract
Recently noise control performance is demanded with the exception of basic performance. Modal experiment should be conducted in evaluation. Now, structure excitation is the mainstream instead of acoustic excitation in method. Some acoustic equipment has been on the large and difficult to measure the input. But there is necessary to improve method for research the properties of vibro-acoustic system. Especially, modal separation need for in high modal density frequency range. Hence, it deliberates the modal properties that contribute largely to the acoustic properties by acoustic excitation. The input is measured by the speaker volume and internal pressure and the speaker is downsized. The acoustic excitation testing is conducted by the speaker to the vehicle. The method validation conducted by a reciprocity test. Next, the FRF by the structure response compared against the structure excitation. Finally, structure response and acoustic response are measured by acoustic excitation at the same time. This research reports the results and deliberation.
