High-frequency local response indication method for sound-solid coupling structure

A coupling structure and local response technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low calculation efficiency and difficulty in obtaining statistical energy analysis methods

Active Publication Date: 2018-09-04
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to address the deficiencies of the prior art, to provide a high-frequency local response prediction method of the acoustic-solid coupling structure, which solves

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  • High-frequency local response indication method for sound-solid coupling structure
  • High-frequency local response indication method for sound-solid coupling structure
  • High-frequency local response indication method for sound-solid coupling structure

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[0068] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0069] Such as figure 2 As shown in , taking the cabin / acoustic cavity coupling system widely used in aerospace vehicles as the research object, the local energy response prediction of the structure under local excitation is carried out. The finite element model of the cabin and acoustic cavity is shown in the figure. The diameter, height and wall thickness of the bottom of the cabin are 400mm, 1000mm, and 4mm respectively. The material parameters are: elastic modulus of 2×10 11 Pa, the density is 7800kg / m 3 , Poisson's ratio is 0.3, structural damping is 0.01; the diameter and height of the bottom surface of the acoustic cavity are 400mm and 1000mm respectively; the parameters of the acoustic cavity are: the density is 1.2kg / m 3 , the sound velocity is 340m / s, and the structural damping is 0.01.

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Abstract

The invention provides a high-frequency local response indication method for a sound-solid coupling structure. A finite element method, a modal power flow equilibrium equation and a local energy indication theory are combined to indicate the high-frequency local response of the sound-solid coupling structure, the finite element method is used for obtaining the displacement modal vibration mode ofa structure subsystem on a coupling edge, the stress modal vibration mode of a sound cavity subsystem on the coupling edge and the inherent frequency and the modal quality of the subsystem, a modal coupling loss factor between subsystems is calculated, and the modal power flow equilibrium equation is established and solved to obtain the modal energy of the structure subsystem. Finally, the local energy indication theory is used for solving the local energy response of the structure subsystem, and a local stress/ strain response is solved through a relationship between the strain energy and thestress strain of an isotropy material. By use of the method, the high-frequency local response indication method for the sound-solid coupling structure can be accurately indicated, and the problems that discretization methods including a traditional finite element method, a boundary element method and the like are low in calculation efficiency and each hypothesis of a statistical energy analysismethod can not be completely satisfied usually in engineering application and is difficult to obtain the local energy of the subsystem can be solved.

Description

technical field [0001] The invention relates to a high-frequency dynamic response analysis method, in particular to an acoustic-solid coupling response method. Background technique [0002] Acoustic-solid coupling problems widely exist in aerospace structures, especially for thin-walled structures under high-frequency excitation, the acoustic-solid coupling effect is easily generated between the structure and the sound field, causing the vibration of the structure and changing the distribution of the sound field, and then Affect the safety of the structure and the functionality of the equipment. Therefore, the vibration level of the structure and the noise level of the acoustic field are important indicators that must be considered in the structural design stage. It is of great application value to study the acoustic-solid coupling problem of thin-walled structures under high-frequency excitation. [0003] At present, there are mainly experimental methods, theoretical metho...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 李彦斌王攀陈强费庆国吴邵庆张鹏
Owner SOUTHEAST UNIV
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