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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/>
[가솔린엔진부문] 자동차 냉각시스템에 관한 실험적 연구
김진현(J.H. Kim),이해철(H.C. Lee),박종남(J.M. Park),이준서(J.S. Lee),차경옥(K.O. Cha) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
There are a variety of cooling systems that can be used to accomplish this goal. Cooling is therefore normally achieved through a balance of ram and fan action. Coolant is used to cool the engine's radiator and turbocharger intercooler in order to provide suitable temperatures, which result in higher power, better fuel economy. improved emissions and extended engine life. Cooling is normally achieved through a balance of ram and fan action. More recently additional large heat loads have been imposed and fan size had to be increased. To reduce the associated increase in noise and to achieve a better match for engine-drive fans between the cooling air flow under ram conditions and the heat load generated by the engine, various means were devised to modulate the fan's output, or to decouple the fan from the engine. Present emphasis on improved fuel economy has created a new urgency to make cooling systems more compact and efficient.<br/> This paper studies the various conditions and analytic the heat exchanger's capabilities and cooling effectiveness for several air flow rates, based on a typical automotive engine.<br/>