A Prediction Method of High Frequency Local Response of Acoustic-Structure Coupling Structure

Abstract

The invention provides a high-frequency local response prediction method of an acoustic-solid coupling structure, which combines the finite element method, modal power flow balance equation and local energy prediction theory to predict the high-frequency local response of the acoustic-solid coupling structure. The finite element method obtains the displacement mode shape of the structural subsystem at the coupling side, the stress mode shape of the acoustic cavity subsystem at the coupling side, the natural frequency and modal quality of the subsystem, and calculates the modal coupling between the subsystems Loss factor, and then establish and solve the modal power flow balance equation between subsystems to obtain the modal energy of the structural subsystem. Finally, the local energy prediction theory is used to solve the local energy response of the structural subsystem, and the local stress / strain response is solved through the relationship between the strain energy and stress-strain of isotropic materials. This method can accurately predict the high-frequency local response of the acoustic-solid coupling structure, and solves the problem of the low calculation efficiency of traditional finite element method and boundary element method and the incomplete assumptions of statistical energy analysis methods in engineering applications. Satisfied and difficult to obtain the local energy problem of the subsystem.

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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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 the problem of low calculation efficiency and statistical The assumptions of the energy analysis method are often not fully satisfied in engineering applications and it is difficult to obtain the local energy problem of the subsystem

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