Acoustic control method of active structure of sealed cavity

A closed cavity, active structure technology, applied in the direction of sound-producing instruments, instruments, etc., can solve the problems of poor system versatility, inability to generalize, and low robustness.

Inactive Publication Date: 2015-04-22
SOUTHEAST UNIV
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Problems solved by technology

[0006] Technical issues: At present, the scalability of the active structure-acoustic distributed control system is not strong, resulting in poor versatility of the system, and it is difficult to adapt to the dynamics and uncertainties of the external environment, and the robustness is not high, so that it cannot be used in engineering Promotion in application

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  • Acoustic control method of active structure of sealed cavity
  • Acoustic control method of active structure of sealed cavity
  • Acoustic control method of active structure of sealed cavity

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] The present invention provides a method for controlling active structure-borne sound in a closed cavity, the method comprising the following steps:

[0059] Step 1: Decompose the closed cavity structure-acoustic control problem;

[0060] The noise in the closed cavity is dominated by the structural mode of the elastic plate excited by the primary, that is, the eigenfrequency of the elastic plate and the acoustic mode of the cavity and the eigenfrequency of the cavity, especially when the eigenfrequency of the elastic plate is close to the cavity Strong structure-acoustic coupling will be generated when the characteristic frequency of the cavity is high, causing the peak of the sound pressure in the cavity to appear at this frequency; when the size of the closed cavity is not very large, the cavity noise is mainly dominated by several order structural modes. Wit...

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Abstract

The invention discloses an acoustic control method of an active structure of a sealed cavity. The method comprises the following steps that firstly, the acoustic control problem of the structure of the sealed cavity is resolved; secondly, a local control problem solution scheme is provided; thirdly, coordination between controller bodies is carried out. According to the method, the bodies can be conveniently added or removed, and the rest of a system do not need to be redesigned, and it is indicated that a surface system has high expandability. In addition, the method has the self-governing performance, flexibility and sociality, and dynamic noise in the sealed cavity can be effectively treated. In other words, the method has the advantages of being capable of meeting intelligence, strong robustness and expandability needed by large-scale engineering application and the like.

Description

technical field [0001] The invention belongs to the technical field of structural sound active control, and in particular relates to an intelligent noise control method in a rectangular closed cavity. Background technique [0002] Closed elastic thin-walled structures are typical structures with extensive engineering background, such as submarine hulls, cabin shells of various vehicles and spacecraft cabins, etc. The initial research on the active control of the closed sound field began in the 1950s, but due to the limitations of electronic technology, in the following 30 years, the active control technology of the closed sound field seems to have made little progress. Since the 1980s, with the development of microprocessor technology, it has become possible to realize the active control system of closed sound field, especially in transportation. The development of aircraft and automotive engine materials has increased the strength to mass ratio, improving fuel economy, but...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16
Inventor 陈南崔怀峰陈大林
Owner SOUTHEAST UNIV
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