전기자동차의 사운드디자인 개선을 위한CFRP 스피커의 음향 특성 연구

초록

The noise characteristics of electric vehicles (EVs) and internal combustion engine vehicles (ICEVs) are different. Compared with vehicles with combustion engines, cars are quieter and have a lower interior overall sound pressure. The sound quality in the compartment of an EV degrades because of high frequency motor noise and road noise, which are not masked by engine noise. Therefore, to improve sound quality, an EV requires active sound generation (ASG) systems that can actively control interior sound quality. ASG requests an audio speaker with superior high frequency response to mask or control the level of high frequency noise. This study aims to develop carbon fiber reinforced plastic (CFRP) speakers with superior high frequency response. Using a commercial CFRP speaker, a numerical model for the proposed speaker was developed via a finite element (FE) method and experimentally validated. The frequency response of a CFRP speaker and general car audio speaker was analyzed using the developed FE model, and the sound radiation characteristics of two speakers were compared. The CFRP speaker was confirmed to have a superior high frequency response to a general audio speaker.

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