The Muffler Design And Test Evaluation Of The Passenger Car

Along with China's urban scale increasing, urban traffic increasingly developed, people around the car is more and more, subsequent noise pollution was also given. The engine noise is the main part of the automobile noise, it is a variety of sound with a combination of noise, the noise source, in engine exhaust noise about 30% of the total noise, is all the proportion of noise is one of the biggest, than other machine noise, so the higher to 10-15 dB noise control car of exhaust noise, must adopt measures, namely add engine exhaust muffler. So the design and manufacture of low noise car, developed acoustic the good performance of automobile design personnel muffler is one of the important tasks.In this paper, according to the muffler,exploited examples of automobile noise and its control by the basic theory and application technology research, mainly discuss vehicle exhaust muffler design. And test methods, and use data suggests various exhaust silencer system noise reduction effect.Through the "cold end" system to exhaust pipe diameter analysis, from airflow velocity to forecast the diameter could meet next system noise the developing goal. Through the analysis and volume of exhaust muffler attenuation CAE analysis results system, the amount of noise reduction result forecast system.Through the bench test, obtained the original pieces and two design schemes, the insertion loss of power loss ratio and exhaust back pressure difference scheme, to select the suit relatively, if all not ideal, then through the spectrum diagram, acceleration curves are analyzed, and then puts forward better plan. Through the modal test, analysis the system of the first order of vertical bending mode and lateral bending mode, find the nodes and the system of the place, and forecast the node muffler hanging point rationality and engine low-speed incentive resonance possibilities. Through the inner pressure strength test, inspection muffler processing intensity, until muffler for excessive pressure inside the burst, test that end. In this paper the design and development of muffler early and later the test after test plan makes a systematic research, related research results can be used for the development of the muffler guide.