Single-cavity multi-resonant-frequency lateral-support resonant muffler

Abstract

A single-cavity multi-resonant-frequency lateral-support resonant muffler belongs to the field of the control of automobile noise and mainly consists of a main pipe, a resonator, a diaphragm, a pressing plate and a connecting screw assembly. According to characteristics of an air inlet noise source and the distribution situation of an engine cabin, a resonator cavity can be designed into a cylindrical shape and a hexagonal shape. When the resonator cavity is a cylindrical cavity, the cylindrical bottom surface is completely or partially covered by the thin diaphragm, and two resonant frequencies can be obtained by optimizing the size and the thickness of the diaphragm; and when the resonator cavity is a hexagonal cavity, at most five surfaces of the resonator are substituted by the thin diaphragm, and more than one and less than five resonant frequencies can be obtained. The single-cavity multi-resonant-frequency lateral-support resonant muffler has characteristics that through the method by utilizing the thin diaphragm to substitute the rigid wall of the traditional resonator, two or more resonant frequencies can be obtained, so that multiple frequency band noise in an air inlet system of the engine can be eliminated, and the defects that the traditional single-cavity resonant muffler only can eliminate one frequency band noise can be overcome.

Description

technical field [0001] The title of the present invention is a single-cavity multi-resonance frequency bypass type resonance muffler, which belongs to the technical field of automobile noise control. Background technique [0002] With the development of the city and the gradual improvement of road infrastructure, the number of cars in the city has increased sharply, and the noise pollution on both sides of the main roads in the city has continued to intensify, seriously affecting the rest, education and cultural activities of residents. The noise radiated by cars has already become the main source of noise pollution in the urban environment. In the car radiated noise, depending on the type of vehicle, the intake noise radiation ratio of the engine can be as high as 11%, especially for small high-speed gasoline engines and large supercharged diesel engines, the intake noise can sometimes be higher than the combustion noise and mechanical noise of the engine. (3-8) dB, which ...

AI Technical Summary

Problems solved by technology

Judging from domestic and foreign literature and patent authorization, the main measure to control engine intake noise is to install a resonant muffler on the intake system. To eliminate broadband low-frequency intake noise, it is necessary to use a large-volume resonator or a combination of several resonators. A large-volume muffler will bring greater difficulties to the layout of the engine room.

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