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정광국(K.K.Chung),박진용(J.Y.Park),장우종(W.J.Chang),박세만(S.M.Bahk),차경옥(K.O.Cha) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
One of the characteristics desired of an ideal automotive friction material is a constant coefficient of friction. In practice. however, it is found that the coefficient frequently varies. for example. frictional force does not increase linearly with increasing normal load. Thus. it appears that the frictional force under sliding conditions is very likely to be dependent upon the normal load, speed, and temperature, and the Amontons' law is a very special case rather than a general rule.<br/>
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/>
朴鎭庸,車京玉,李珉湖,鄭廣國 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
One of the Characteristics desired of an ideal automotive friction material is a constant coefficient of friction. In practice, it is found that the coefficient frequently varies, for example, frictional force does not increase linearly with increasing normal load. Thus, it appears that the frictional force under sliding conditions is very likely to be dependent upon the normal load speed, and temperature, and the Amontons' law is a very special case rather than a general rule.