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Directional propagation and localization control method for broadband acoustic energy in acoustic waveguide

A control method and acoustic waveguide technology, applied in the direction of sound-generating devices and instruments

Active Publication Date: 2021-09-07
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • 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 localization control method for broadband acoustic energy in acoustic waveguide
  • Directional propagation and localization control method for broadband acoustic energy in acoustic waveguide
  • Directional propagation and localization control method for broadband acoustic energy in acoustic waveguide

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Embodiment Construction

[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

The invention discloses a directional propagation and localization control method for broadband acoustic energy in an acoustic waveguide. The method comprises the steps: reasonably designing the physical parameters and coupling positions of a nonlinear Helmholtz resonator according to the geometric parameters of an acoustic waveguide; and controlling the spatial distribution of acoustic energy in the acoustic waveguide, so that the acoustic energy on the left side of the acoustic waveguide is concentrated in a traveling wave area to achieve directional propagation, and the acoustic energy on the right side of the acoustic waveguide is concentrated in a standing wave area to achieve localization. According to the invention, an approximately perfect reflection-free boundary condition of a wide band is realized in a limited acoustic waveguide; and the spatial distribution of the energy of a broadband acoustic wave in the acoustic waveguide can be controlled, and the application range is widened.

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 Applications(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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