| The intake and exhaust noise of automotive engine is one of main noise sources of automobile noise. The most effective measure to control intake and exhaust noise is using muffler in intake and exhaust system. The configuration of resistance is simple and the resistance muffler has better anechoic performance. The resistance perforated tube muffler which has better anechoic performance in high frequency and good fluid dynamics performance has an important application in the area of muffler. Designing a resistance muffler with high anechoic performance and low pressure loss has become an important subject on intake and exhaust noise control.The simple resistance muffler has been dissertated by many scholars. By using the finite element software HYPERMESH, the professional acoustic software SYSNOISE and the fluid dynamic software FLUENT, the computation and analysis of numerical simulation of acoustic performance, aerodynamic performance and dynamic characteristics of perforated tube muffler are carried out in this thesis. In acoustics aspect, the paper improves the method of calculating transmission loss and analyses emphatically the influence of structure parameters of perforated structure to acoustic performance. In fluid dynamics aspect, the paper meshes the perforated tube muffler using the method of splitting the model, calculates the pressure loss of the muffler, analyses structure parameters of perforated structure and explains the cause of pressure loss.The numerical simulation of perforated tube muffler in this thesis can provide reference and new method for muffler design. It is of important reference value for improving the design and analysis of muffler. |
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