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SEA 해석을 통한 대시 흡차음재 중량 저감 성능 연구
오현철(Hyuncheol Oh),박광서(Kwangseo Park),김영호(Youngho Kim),김인동(Indong Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
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 loss 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 FEM pre/post software was used to calculate thickness map from CAD drawing. Each predicted transmission loss 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 weight insulation system has lower sound transmission loss and higher absorption coefficient than conventional system.
SEA 기법을 이용한 저중량 흡, 차음재의 대시판넬 적용에 대한 연구
임효석(Hyosuk Lim),문홍준(Hongjoon Moon),박광서(Kwangseo Park),김영호(Youngho Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this Paper Statistical Energy Analysis has been considered to predict high frequency air borne interior noise. Insulation thickness distribution map was calculated not by measurement, but by FeGate software. AutoSEA software predicted coupling loss factor from insertion loss which was measured by using Reiter Apamat Ⅱ machine and internal damping loss factor from reverberation time according to each thickness and material density. Each predicted transmission losses between conventional insulation and light weight insulation are compared with SEA. Finally light weigh insulation system has lower sound transmission loss and higher absorption coefficient than conventional system.
자동차용 흡.차음재의 성능분석을 위한 통계적 에너지 기법의 적용
이장명,이준,김대곤 한국소음진동공학회 2003 한국소음진동공학회 논문집 Vol.13 No.1
Interior parts of a vehicle are getting important to reduce interior noise. Therefore, prior analysis of cabin noise related with interior parts are necessary at first design stage. Recently, Statistical Energy Analysis(SEA) has been suggested as a possible way for high frequency range noise analysis of interior parts. The validity of noise analysis with SEA to interior parts has been preyed by comparing with experimental result, and the developed method with SEA has been applied in finding optimized interior parts package.