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차량 실내 소음 저감을 위한 능동 소음 제어계의 최적 설계
양인범(I.B.Yang),왕세명(S.M.Wang) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
Optimal design of an active noise control(ANC) system is studied for structural-acoustic coupled vehicle cavity model. Optimal position of actuator is determined using finite element analysis (FEA). For the half car cavity model, structural-acoustic coupled frequency resbonse analysis is executed after structure normal mode analysis and acoustic normal mode analysis. After that, contribution factors of virtual acoustic sources are obtained. The position that has maximum contribution factor can be the optimal position. Optimal position acquired from FEA results is verified through experiment. Filtered-x LMS algorithm is adapted to implement ANC system and TMS320C31 digital signal processor(DSP) board is used. Overall 7~9 dB noise reduction is acquired at the optimal position of the actuator after 3 iteration. At the other actuator positions, about 7 dB noise reduction is acquired after 6 or 9 iteration.<br/>