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Optimal Design of the Vehicle Muffler and Noise Reduction

Author: MaXiaoGuang
Tutor: YangJunZhi
School: Lanzhou University of Technology
Course: Vehicle Engineering
Keywords: Exhaust muffler Finite Element Method Muffler Pressure loss
CLC: U464.134.4
Type: Master's thesis
Year: 2011
Downloads: 123
Quote: 0
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Abstract


The car engine exhaust noise is one of the main noise source for car noise control exhaust noise is the most effective way is to install the muffler on the exhaust system. The design high silencer volume, low pressure loss muffler exhaust noise control has become an important topic. The traditional exhaust muffler design is mainly based on the one-dimensional plane wave theory, but the theory is difficult to correctly simulate the 3D wave effect of the real factors, the calculation results are inaccurate. 3D finite element numerical method can accurately simulate the exhaust muffler performance, while taking into account a variety of external factors, is an effective method of muffler performance prediction and design improvements. In this paper, ANSYS acoustic module design muffler acoustic simulation analysis, the use of the ANSYS / FLOTRAN its aerodynamic characteristics were analyzed. Preliminary studies herein typical muffler the the silencer features and muffler law, especially the new impedance complex muffler. An exhaust muffler designed for a certain type of trucks on this basis, and calculated using the software, its the silencer features and aerodynamic characteristics, the inadequacies make improvements and computational analysis again reached until the calculated results than indicators of good design, final design product performance test. The through design muffler repeated simulation, both conclusions can be drawn: mature, the structural design of the muffler, press muffler design Manual and experience design in low band can be seen from the calculation results of the sound field very the characteristics of a good muffler, and the high frequency with the continuous emergence of new sound-absorbing material, sound absorption of a certain increase, at the same time sound-absorbing material also increased the amount of sound absorption in the low-band; from the calculation of the flow field analysis can seen in the premise without reducing muffler corresponding improvement can effectively reduce the pressure loss and to slow down the air flow is not stationary, such as the opening in the separator chamber of the internal structure of the muffler perforations can be effectively suppressed turbulence the formation of straight pipe connecting the pipe with a perforated connection can significantly reduce the flow in the expansion section of volatility. Finally, experimental tests show that the actual products not only meet the requirements of the muffler, and the pressure loss value is significantly lower than the previous design muffler. The exhaust muffler numerical simulation analysis, to provide a reference for the design of the muffler, and for muffler design improvements to provide new ideas and methods to improve the design and analysis of the level of the muffler instructive.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive engine > Reciprocating engine > Components, parts > Valve > Intake and exhaust systems
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