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다채널 적응 알고리즘을 이용한 잔향 음장에서의 능동소음제어에 관한 연구
김홍섭(H. S. Kim),손동구(D. G. Sohn),오재응(J. E. Oh) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
In this study, Active noise controlis implemented with single channel and multi-channel adaptive algorithm in 3 dimensional reverberant enclosure sound field, which occurrs in complicated acoustic mode. First, for the one case excited with the resonant frequency of an enclosure, a target of control and the other cases excited with band-pass filtered random noise(100~400Hz), it is implemented to control reducing interior noise of enclosure with single channel and real time multi -channel adaptive algorithm for global noise reduction in enclosure.
김홍섭(H. S. Kim),손동구(D. G. Sohn),박수홍(S. H. Park),오재응(J. E. Oh) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1
The need for an active exhaust noise controller has been growing as a reinforcement of exhaust noise regulation, high power output and improvement of average fuel economy.<br/> In this study, for development of this active exhaust noise controller. The implementation of a composition of realtime control algorithm for active exhaust noise control and the construction of simulator for active exhaust noise control has been investigated. Also, in order to implement active exhaust noise control with this simulator, the feasibilility model for control of vehicle exhaust noise control is suggested.<br/>
발포 알루미늄 흡음재를 이용한 단순 폐공간의 내부 음장 변화에 관한 연구
김상헌(S. H. Kim),손동구(D. G. Sohn),오재응(J. E. Oh) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.3
For the purpose of finding out the sound field characteristics in a cavity of a rectangular enclosure with foamed aluminum lining, analytical and experimental studies are performed with random noise input. Experimental method using two-microphone impedance tube measures the absorption coefficients and the impedances of simple sound absorbing materials. Measured acoustical parameters of the test samples are applied to the theoretical analysis to predict sound pressure field in the cavity. The sound absorption effects from measurements are compared to prediction in both cases with and without foamed aluminum lining in the cavity of the rectangular enclosure.<br/>