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Novel semi-active control device for pipe exhaust noise

A semi-active control and exhaust noise technology, which is applied in the direction of noise reduction devices, pipe components, engine components, etc., can solve the problems of high sealing requirements, the response time of the adjustment device is not as long as the noise reduction, bulky, etc., and achieve the goal of noise reduction Effect

Inactive Publication Date: 2012-05-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can realize the exhaust noise control of the internal combustion engine under steady-state conditions, but this method has two disadvantages. One is that an additional bulky adjustment device with high sealing requirements needs to be provided when adjusting the length of the pipeline. Second, when the frequency of gas noise in the pipeline changes rapidly and the rate of change is large, the response time of the adjustment device is too long to achieve the purpose of noise reduction

Method used

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  • Novel semi-active control device for pipe exhaust noise
  • Novel semi-active control device for pipe exhaust noise
  • Novel semi-active control device for pipe exhaust noise

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] combine figure 1 , the novel pipeline exhaust noise semi-active control device of the present invention is characterized in that: comprises main pipeline 2, auxiliary pipeline, intake pipeline 1, exhaust pipeline 7, pipeline control switch 3 and controller 9, intake pipeline 1 and Exhaust pipes 7 are respectively installed on both sides of the main pipe 2, the auxiliary pipe 4, the auxiliary pipe 5 and the auxiliary pipe 6 are connected in parallel with the main pipe 2, the pipeline control switch 3 is installed in the auxiliary pipeline, and the controller 9 is connected to the pipeline control switch 3.

[0020] During the working process of the present invention, the air inlet noise is divided into two paths at point A, one path flows to point B along the main pipeline; and the other path flows to point B along one of the N auxiliary pipelines. Among them, the auxiliary pipeline is a plane or space structure designed through optimization. The distance from point A t...

Embodiment approach 2

[0022] On the basis of Embodiment 1, the number of auxiliary pipelines is 3-15.

Embodiment approach 3

[0024] On the basis of Embodiment 1 or Embodiment 2, a muffler 8 is installed on the exhaust pipe 7 .

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Abstract

The invention aims at providing a novel semi-active control device for pipe exhaust noise. The device comprises a main pipe, an auxiliary pipe, an air inlet pipe, an exhaust pipe, a pipeline control switch and a controller; the air inlet pipe and the exhaust pipe are arranged at the two sides of the main pipe respectively; the auxiliary pipe is in parallel connection with the main pipe; the pipeline control switch is arranged in the auxiliary pipe; and the controller is connected with the pipeline control switch. The invention can effectively solve corresponding strong linear spectrum exhaustnoise under varied working conditions; and moreover, a common muffler is arranged at an exhaust noise port behind the device so as to further reduce noise.

Description

technical field [0001] The invention relates to a noise control device used in the field of noise reduction. Background technique [0002] There are two types of existing technologies for exhaust noise control: active noise reduction and passive noise reduction. The passive noise elimination method mainly utilizes the exhaust pipe muffler. In this technical field, the research at home and abroad is relatively mature. However, the passive noise reduction method has inherent shortcomings in the method itself, that is, for exhaust noise where the main noise energy is concentrated below 500 Hz, the passive noise reduction method has disadvantages such as complex structure, poor low-frequency noise reduction effect, large size, and high cost. . For active noise reduction, most of them use the method of introducing secondary sound sources for noise reduction, but this method has very high requirements for the high temperature resistance and corrosion resistance of the error micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/06F01N1/00F16L55/033
Inventor 刘学广殷长春朱敏张斌王晔卢熙群刘志刚
Owner HARBIN ENG UNIV