Directional Propagation and Localized Control Method of Broadband Acoustic Energy in Acoustic Waveguide

A control method and acoustic waveguide technology, applied in the direction of sound-generating devices, instruments, etc., to achieve the effect of broadening the scope of application

Active Publication Date: 2022-03-18
ZHEJIANG UNIV OF TECH
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  • Claims
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Problems solved by technology

However, since the structure of the passive acoustic element is already fixed, it is only effective for one frequency

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  • Directional Propagation and Localized Control Method of Broadband Acoustic Energy in Acoustic Waveguide
  • Directional Propagation and Localized Control Method of Broadband Acoustic Energy in Acoustic Waveguide
  • Directional Propagation and Localized Control Method of Broadband Acoustic Energy in Acoustic Waveguide

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[0044] The technical solution of the patent of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear ” and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or...

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Abstract

A method for directional propagation and localized control of broadband acoustic energy in an acoustic waveguide. According to the geometric parameters of the acoustic waveguide, the physical parameters and coupling positions of the nonlinear Helmholtz resonator are reasonably designed. The spatial distribution of the acoustic energy in the acoustic waveguide is controlled, so that the acoustic energy on the left side of the acoustic waveguide is concentrated in the traveling wave region to achieve directional propagation, while the acoustic energy on the right side of the acoustic waveguide is concentrated in the standing wave region to achieve localization. Broadband near-perfect reflection-free boundary conditions are realized in finite acoustic waveguides. The invention can control the spatial distribution of the energy of a broadband sound wave in the sound waveguide, thereby widening the scope of application.

Description

technical field [0001] The present invention relates to the technical field of acoustic energy control in the acoustic waveguide, in particular to a method of using a side branch nonlinear Helmholtz resonator to realize the directional propagation and localization of the broadband acoustic energy in the acoustic waveguide, thereby controlling the broadband acoustic energy. Energy is distributed within the acoustic waveguide. Background technique [0002] In the field of pipeline acoustic control, it is usually assumed that the end of the pipeline is a non-reflective anechoic end, and the transmission loss is used to evaluate the noise control performance of the anechoic structure. Realizing the directional propagation and localization of sound energy in the pipeline has important technical significance for the measurement and evaluation of pipeline noise and the design of acoustic wind tunnels. [0003] For the energy area separation control problem of single-frequency soun...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/26G10K11/04G10K11/22
CPCG10K11/26G10K11/04G10K11/22
Inventor 卢奂采杜子哲肖永雄
Owner ZHEJIANG UNIV OF TECH
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