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CAE Support to Vehicle Audio Installation Issues
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 30, 2020 by SAE International in United States
Event: 11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
Audio CAE is an emerging area of interest for a vehicle OEM, despite the fact that the development of the audio system is often left to a specialized supplier. Especially the questions regarding early stages of the vehicle design, like choosing the possible positions for speakers, deciding the installation details that can influence the visual design, and integration of the low frequency speakers with the body & closures structure, are of interest. Therefore, at VCC, the development of the CAE methodology for audio applications has been undertaken. The long term goal is to enable performing subjective evaluation of sound in a virtual car, and integrating audio evaluation in the NVH simulator. The key to all CAE applications is the loudspeaker model made available in the vibro-acoustic software used within the company. Such a model has been developed, implemented and verified in different frequency ranges and different applications. The applications can be divided into the low frequency ones (concerning the installation of woofers and subwoofers), and the middle/high frequency ones (concerning the installation of midrange and tweeter speakers). In the case of the woofer, it is the interaction with the body vibration that is of interest. Hence, a full vibro-acoustic Trimmed Body model has to be used together with the loudspeaker. For the higher frequencies (midrange & tweeter) the body can be treated as locally reacting, if not rigid. The examples of the verification of the speaker model versus test data for a woofer mounted in a car door will be shown, together with applications to woofer installation issues. Regarding high frequencies, examples will be shown of the comparison of different grille variants and the evaluation of the position of the speaker on the sound quality at the listeners' positions. Finally, some remarks concerning the future development plans will be given.