4 행정 가솔린 기관의 배기계 맥동 압력 감쇄 특성에 관한 실험적 연구.

Pulsating pressure of engine exhaust system is generated by pulsating gas flow due to working of exhaust valve. This exhaust gas pulsating flow is closely concerned to engine power loss according to back pressure and engine exhaust noise. Moreover, in case of estimating the muffler, conventional prediction method, which is based on linear acousstic theory, gives many restrictions and an overestimate. These fact suggest that the nonlinear effect due to large amplitude of pulsating pressure. In this paper. it shows difficulty in theoritical prediction in typical engine. As the first step for solving this problem we measured pulsating histories. Measured pressure histories in exhaust system are analyzed by spectral formula. And using the frequency response function. experimental model of performance test is proposed by pulsating pressure attenuation characteristics due to exhaust system.