Proceedings of the Korean Society for Noise and Vibration Engineering Conference (한국소음진동공학회:학술대회논문집)
- 2007.05a
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- Pages.51-55
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- 2007
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- 1598-2548(pISSN)
Acoustic Study of light weight insulation system on Dash using SEA technique
SEA 기법을 이용한 저중량 대시판넬 흡,차음재 성능에 대한 연구
- Lim, Hyo-Suk (GM Daewoo Auto and technology) ;
- Park, Kwang-Seo (GM Daewoo Auto and technology) ;
- Kim, Young-Ho (GM Daewoo Auto and technology) ;
- Kim, In-Dong (GM Daewoo Auto and technology)
- Published : 2007.05.10
Abstract
In this paper Statistical Energy Analysis has been considered to predict high frequency air borne interior noise. Dash panel Insulation is major part to reduce engine excitation noise. Transmission loss and absorption coefficient are considered to predict dash insulation performance. Transmission lose is derived from coupling loss factor and absorption coefficient is derived from internal damping loss factor. Material Biot properties were used to calculate each loss factors. Insulation geometry thickness distribution was hard to measure, so FeGate software was used to calculate thickness map from CAD drawing. Each predicted transmission losses between conventional insulation and light weight insulation were compared with SEA. Transmission loss measurement was performed to validate each prediction result, and it showed good correlation between prediction and measurement. Finally interior noise prediction was performed and result showed light weight insulation system can reduce 40% weight to keep similar performance with conventional insulation system, even though light weigh insulation system has lower sound transmission loss and higher absorption coefficient than conventional system.
Keywords
- Statistical Energy Analysis(SEA);
- Loss Factor;
- Damping Loss Factor;
- Coupling Loss Factor;
- Transmission Loss
- 통계적 에너지 해석;
- 손실 계수;
- 댐핑 손실 계수;
- 연성 손실 계수;
- 투과 손실;