Design method of bypass broadband silencer for reducing acceleration roar noise of exhaust tail pipe

Abstract

The invention discloses a design method of a bypass broadband silencer for reducing acceleration roar noise of an exhaust tail pipe. The method comprises the following steps: determining the frequency of the acceleration roar noise of an exhaust tail pipe and the cause of the acceleration roar noise through the noise test of the exhaust tail pipe when a vehicle accelerates, then designing the initial structure parameters of a bypass broadband silencer, and constructing a three-dimensional model of the bypass broadband silencer according to the initial structure parameters and the size of the exhaust pipe; and constructing an acoustic finite element model of the bypass broadband silencer based on the three-dimensional model, then carrying out noise transmission loss simulation analysis, optimizing initial structure parameters according to an analysis structure, and when the optimized structure parameters meet a preset target, constructing a final bypass broadband silencer by using the optimized structure parameters. The exhaust tail pipe acceleration roaring noise caused by an engine is eliminated through the designed bypass broadband silencer structure, then the overall noise level of the exhaust tail pipe is greatly reduced, and the vehicle sound quality is improved.

Description

technical field [0001] The invention belongs to the technical field of vehicle noise control, in particular to a design method of a side branch wide-band muffler for reducing the accelerated roaring noise of an exhaust tail pipe. Background technique [0002] The noise level inside and outside the vehicle not only affects the comfort performance of the vehicle, but also is a key indicator for evaluating the quality of the vehicle. Among them, exhaust tail pipe noise is one of the main contributions to the noise inside and outside the car. Especially when the vehicle accelerates, the exhaust tail pipe often produces acceleration roaring noise, which seriously affects the comfort performance of the vehicle and causes complaints from drivers and passengers. , reducing the market competitiveness of automotive products. Therefore, the accelerated roaring noise of the exhaust tailpipe has also attracted more and more attention from automobile manufacturers and scientific research...

AI Technical Summary

Problems solved by technology

[0004] Existing solutions can relieve the exhaust tail pipe acceleration roar noise, but it is difficult to eradicate the exhaust tail pipe acceleration roar noise caused by the engine, and adjusting the engine program and the engine universal characteristic curve, or optimizing the structure of the exhaust system muffler will also Affects vehicle dynamics and economy

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