Composite waveguiding structure broadband unidirectional silencer

A composite waveguide and muffler technology, which can be used in sound-generating equipment, instruments, etc., can solve the problems of insensitivity to the incident angle and intensity of sound waves, one-way rectification of sound waves, etc., and achieve the effects of improving concealment, high noise reduction ratio and simple structure.

Active Publication Date: 2015-11-04
HARBIN ENG UNIV
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Problems solved by technology

[0011] The purpose of the present invention is to solve the problem of one-way rectification of sound waves in the prior art, and propose a composite waveguide struc

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  • Composite waveguiding structure broadband unidirectional silencer
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  • Composite waveguiding structure broadband unidirectional silencer

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing.

[0034] combine figure 1 , the structure of this one-way muffler is a cuboid, the upper and lower walls of the cuboid are rectangular concave-convex structures with a fixed period, the front and rear walls are flat plates for fixing, and the concave-convex structures on the left and right sides of the upper and lower walls are different in size to achieve different sound conduction functions. The waveguide material of the cuboid is a rigid material, and its acoustic impedance is much greater than that of air. Waveguide 1 has 10 periods, each period length is 100mm, and waveguide 2 has 15 periods, each period length is 46mm. The periodic structure parameters can be given by the dispersion curve: (c is the speed of sound, f is the center frequency of the transmission spectrum, p is the pth order transverse mode, It is the zero point of the p-th order Bessel function, and ...

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Abstract

The invention provides a composite waveguiding structure broadband unidirectional silencer. A cuboid wave guide is formed by upper and lower walls, and front and back walls; the upper and lower walls are of a rectangular concave-convex structure with a fixed cycle; the front and back walls are flat; the size of each concave-convex structure at the left and right sides of the upper and lower walls is given by a dispersion curve; the waveguides with different functions at the left and right sides of the waveguide are named as the wave guide 1 and the wave guide 2; the concave-convex structure of the upper and lower walls can be produced on the selected flat material by a digital controlled lathe according to the size; the concave-convex structure of the waveguide 2 is to be carved when the cycle of the waveguide 1 is carved; the combination of the two waveguides can realize unidirectional conduction of the sound wave; and when incidence of the sound wave occurs, the waveguide 2 generates a frequency domain band gap for Bragg resonance of fundamental modes, the interaction among horizontal standing wave modes occurs in the waveguide 1, a single higher-order mode is generated and will not be influenced by the band gap generated by the waveguide 2, and the higher-order mode can be penetrated. The composite waveguiding structure broadband unidirectional silencer of the invention has the advantages of being high in noise abatement rate, being simple in structure, being high in adaptability, being lower in cost, and being easy to realize.

Description

technical field [0001] The invention relates to the technical field of sound wave one-way transmission control, in particular to a composite waveguide structure broadband one-way muffler. Background technique [0002] Sound waves are ubiquitous in daily life, and they are as common energy carriers as light waves. Sound waves are one of the important means for people to communicate and transmit information, and in some fields such as underwater acoustic communication, weather radar, medical B-ultrasound, etc., acoustics has an irreplaceable role, so the regulation of sound waves has very important scientific significance . [0003] It has high application value to realize the one-way conduction function of the sound wave through the selection of the sound waveguide structure and constituent materials. In the past ten years, the fluctuation problem in the periodic structure has become a hot issue. Many crystals in nature have periodic structures, and they can also be manufac...

Claims

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Application Information

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IPC IPC(8): G10K11/04
Inventor 陶智勇桑汤庆樊亚仙徐丹徐兰兰
Owner HARBIN ENG UNIV
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