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- 저자 : 이준(B. J. Lee) (검색결과 79 건)
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4행정 가솔린 기관의 배기계 맥동압력 전달특성에 대한 주파수 해석
이준서(J.S.Lee),정광국(K.K.Chung),박종남(J.N.Park),유병구(B.K.Yoo),박세만(S.M.Bahk),차경옥(K.D.Cha) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Pulsating pressure of exhaust system is generated by pulsating gas flow due to working of exhaust valve. The pulsating gas flow is closely<br/> concerned to engine power loss according to back pressure and exhaust noise. However, because of nonlinear effect due to large amplitude of pulsating pressure. it is difficult to exactly calculate pulsating pressure propagation in exhaust system of typical engine, Moreover, in case of estimating exhaust system performance, conventional prediction method which is based on linear theory, gives many restrictions and overestimate.<br/> As the first step for solving this problem, this paper contains experimental model to measure pulsating pressure propagation and shows power spectrum density, frequency response function, coherence in frequency domain for characterize pulsating pressure propagation in exhaust system of typical engine.<br/>
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高次스펙트럼을 利用한 機關 排氣系의 非線型 脈動壓力 解釋에 관한 硏究
이준서(J.S.Lee),이민호(M.H.Lee),김명균(M.G.Kim),김봉각(B.K.Kim),임인권(I.G.Lim),차경옥(K.O.Cha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The engine exhaust noise is mainly made of the pulsating gas flow and pulsating pressure at a very high pressure level. Frequently, this pulsating pressure level is out of the pressure level range which the linear acoustic theory is applicable. The conventional prediction method which is based on the linear acoustic theory gives an overestimate in comparison with results measured in operating engines. This paper, as the first step for solving this problem, proposes a non linear effect of pulsating pressure waves. The phenomenon proposed here is identified by using of higher order spectrum(bicoherence),<br/>
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