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Cavity-movable Helmholtz resonator and control method thereof

A mobile resonator technology, applied in the cavity movable Helmholtz resonator and its control field, can solve the problem of weak noise reduction and achieve good noise reduction performance

Pending Publication Date: 2021-06-15
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a cavity-movable Helmholtz resonator and its control method, which solves the problem of weak sound attenuation of the traditional Helmholtz resonator when the flow Mach number changes

Method used

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  • Cavity-movable Helmholtz resonator and control method thereof
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  • Cavity-movable Helmholtz resonator and control method thereof

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0025] Such as Figure 1 to Figure 5 As shown, a cavity movable Helmholtz resonator of the present invention includes a main air intake pipe 1, and a main air intake pipe 1 is fixedly installed on the main air intake pipe 1 and arranged vertically with the main air intake pipe. 1 communicated with the neck short tube 2, the neck short tube 2 is a hollow structure, the end of the neck short tube 2 is fixedly installed with a rigid backboard 3, the rigid backboard 3 is vertically arranged with the neck short tube 2, and the rigid backboard 3 is equipped with a moving cavity assembly 4, and the moving cavity assembly 4 is equipped with a resonance cavity 5 that can slide on the moving cavity assembly 4. The resonance cavity 5 is a hollow and bottomless cylindrical cavity, and the resonance cavity The inside of the body 5 communicates with the short neck tube 2,...

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Abstract

The invention discloses a cavity-movable Helmholtz resonator and a control method thereof. The resonator comprises an air inlet main pipeline, a neck short pipe which is vertically arranged relative to the air inlet main pipeline and is communicated with the air inlet main pipeline is fixedly installed on the air inlet main pipeline, a rigid back plate is fixedly installed at the end of the neck short pipe, a movable cavity assembly is installed on the rigid back plate, a resonant cavity capable of sliding on the movable cavity assembly is installed on the movable cavity assembly, the interior of the resonant cavity is communicated with the neck short pipe, and a system control module is further installed at the upstream position of the air inlet main pipeline. A measured flow velocity signal is subjected to a series of signal conversion through an L-shaped pitot tube and transmitted to a stepping motor to drive a double-gear moving guide rod assembly to move, so that the offset distance between the resonant cavity and the neck short pipe is controlled, and the purpose that the Helmholtz resonator always keeps the best noise reduction performance under different flow Mach numbers is achieved.

Description

technical field [0001] The invention relates to a Helmholtz resonator, in particular to a movable cavity Helmholtz resonator and a control method thereof. Background technique [0002] As a typical noise reduction device, Helmholtz resonators are widely used in aero-engines and gas turbines to reduce the propagation of noise. However, due to the limited space of the engine, an asymmetric Helmholtz resonator can be designed, but the traditional asymmetric Helmholtz resonator can only achieve the maximum noise reduction effect for a specific flow velocity. [0003] The application number is CN201910966633.0, and the invention patent titled "a Helmholtz resonator and its working method" discloses a structure of two coupled resonant cavities, and the two resonant cavities are adjusted by an aperture valve. The size of the aperture. The device can well widen the muffler's muffler frequency band and increase the number of resonance peaks; however, its muffler effect is obviously...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/16
CPCG10K11/172G10K11/161
Inventor 杨兴林赵鹏瑜吴维维管毅恒陆拯礼
Owner JIANGSU UNIV OF SCI & TECH