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Acoustic Simulation of Intake and Exhaust Systems of Turbocharged Gasoline Engines
Published May 20, 2009 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
For decreasing fuel consumption and exhaust gas emissions, the engine development strongly tends towards downsizing concepts. For this reason, turbocharged gasoline engines become more and more important and are these days in the attention of several research activities and investigations. The focus of the present paper is the optimization of the acoustic performance of the different parts in the intake and exhaust line, mainly focusing on the turbocharger of such engines. These acoustic properties, together with the acoustic excitation due to the cyclic opening and closing of the intake and exhaust valves, are responsible for the orifice noise contribution of a vehicle. And this orifice noise contribution co-determines on one hand the pass-by noise level of a vehicle and is, on the other hand, a major criterion for the design of the vehicle interior sound. Discussed is the study and simulation of the fluctuating pressure wave transfer through the intake and exhaust system including the turbocharger contribution and the influence of intercooler, catalyst and silencers. The investigations have been performed by simulation using a 1D gas dynamic prediction tool and verified by experiments in the engine test cell.