Numerical Simulation On Performance Of Automobile Exhaust Muffler

In recent years, with the rapid development of automobile industry and the pace of people’s life accelerated, the car has become indispensable in people’s lives transport. However, with the surge in the number of cars in the city, air pollution and noise pollution are also becoming increasingly serious. National Governments have begun to develop more stringent emission regulations, the automobile manufacturers have also committed themselves to reduce noise and emission of the car. Consumers are increasingly inclined to choose the economical, comfortable, and less pollution vehicles.The exhaust noise of the automobile engine is one of major sources of automotive noise. Now the most effective way to reduce exhaust noise is installing muffler in the exhaust system. Automotive exhaust muffler design should focus on the aerodynamic performance, and the competence of reducing noise. So designing a exhaust muffler with high aerodynamic performance muffler, low pressure loss has become an important issue on automotive exhaust noise control.First, based on the fluid dynamic software Fluent, the paper makes simulation on the flow field of a automobile muffler, and then make a research on the regeneration noise of the muffler; Second, based on professional acoustic software Virtual. Lab Acoustics, figure out muffler transmission loss under influence of some external conditions; At last, in view of the shell vibration and resonance noise of the muffler, furthermore the paper makes a modal analysis, and derives inherent frequencies and vibration patterns.The methods of numerical simulation and analysis in this paper, as well as some experience and conclusions summed up can supply reference to the vehicle exhaust muffler design and development of other similar products.