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      Based on experimental analysis, the characteristics of pulsating pressure wave propagation is clar-ified by testing of 4-stroke gasoline engine. The pulsating pressure wave in exhaust system is gen-erated by pulsating gas flow due to working of exhaust valve. The pulsating pressure wave is closely concerned to the loss of engine power according to back pressure and exhaust noise. It is difficult to exactly calculate pulsating pressure wave propagation in exhaust system because of nonlinear effect. Therefore, in the first step for solving these problems, this paper contains experi-mental model and analysis method which are applied two-port network analysis. Also, it shows co-herence function, frequency response function, back pressure, and gradient of temperature in ex-haust system.<br/>
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      Based on experimental analysis, the characteristics of pulsating pressure wave propagation is clar-ified by testing of 4-stroke gasoline engine. The pulsating pressure wave in exhaust system is gen-erated by pulsating gas flow due to working of exhaus...

      Based on experimental analysis, the characteristics of pulsating pressure wave propagation is clar-ified by testing of 4-stroke gasoline engine. The pulsating pressure wave in exhaust system is gen-erated by pulsating gas flow due to working of exhaust valve. The pulsating pressure wave is closely concerned to the loss of engine power according to back pressure and exhaust noise. It is difficult to exactly calculate pulsating pressure wave propagation in exhaust system because of nonlinear effect. Therefore, in the first step for solving these problems, this paper contains experi-mental model and analysis method which are applied two-port network analysis. Also, it shows co-herence function, frequency response function, back pressure, and gradient of temperature in ex-haust system.<br/>

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