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Method for calculating intermediate and high frequency dynamic response of acoustic vibration system

A technology of dynamic response and frequency dynamics, applied in computing, special data processing applications, instruments, etc., can solve complex problems that cannot be applied quickly

Active Publication Date: 2012-04-11
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, no matter which development direction the full frequency domain analysis method is obtained from, there are problems that the solution is complicated and cannot be quickly applied to practical engineering

Method used

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  • Method for calculating intermediate and high frequency dynamic response of acoustic vibration system
  • Method for calculating intermediate and high frequency dynamic response of acoustic vibration system
  • Method for calculating intermediate and high frequency dynamic response of acoustic vibration system

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Embodiment

[0043] The sound insulation enclosure structure is an acoustic-vibration coupling system widely used in engineering to control noise transmission to provide a quiet working environment or living environment. The dynamic response analysis of the sound insulation performance of the sound insulation enclosure has important engineering application value and significance. This embodiment is to use the method proposed by the present invention to calculate the sound insulation performance of the sound insulation cover in the middle and high frequency range, wherein the sound insulation performance is represented by transmission loss NR=L w1 -L w2 , L w1 is the sound power of the sound space inside the sound enclosure, L w2 It is the sound power radiated by the sound insulation enclosure to the external sound space.

[0044] Refer to attached image 3 , The sound insulation cover in the present embodiment is a cuboid, the size is 0.868m * 1.15m * 1m, the thickness of the wall pane...

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Abstract

The invention provides a method for calculating the intermediate and high frequency dynamic response of an acoustic vibration system. The method comprises the following steps of: firstly dividing the acoustic vibration system to be researched into N subsystems; then, determining analysis frequency ranges to which a modal energy analysis method and a statistical energy analysis method are applicable; when the analysis frequency is in an intermediate frequency range, calculating the intermediate frequency dynamic response of the researched acoustic vibration system by adopting the modal energy analysis method; and when the analysis frequency is in a high frequency range, calculating the high frequency dynamic response of the researched acoustic vibration system by adopting the statistical energy analysis method, wherein the modal energy analysis method comprises the following steps of: firstly determining the number of resonance modes and resonance frequency values of all the subsystems in the intermediate frequency range, and then establishing a power flow balance relationship among the resonance modes of the N subsystems, and finally solving the modal energy of each mode of all the subsystems according to the power flow balance relationship, summing the modal energy of the modes of each subsystem in an analysis frequency band so as to obtain the energy response of each subsystem in the analysis frequency band.

Description

technical field [0001] The invention relates to the field of dynamic response analysis of the acoustic vibration system, in particular to a method for calculating the high frequency dynamic response of the acoustic vibration system. Background technique [0002] The methods of structural dynamic response analysis can be mainly classified into two categories: analytical methods and numerical methods. The analytical method is mainly to simplify the structure to be studied into an elastic beam, flat plate, cylindrical shell or cone shell structure, and use integral transformation or modal analysis method to establish the fluid-solid coupling equation, and then solve the modal radiation sound power of the structure. Although analytical methods provide clear physical concepts during analysis, they are often not suitable for solving practical engineering problems. Because with the increase of analysis frequency or the complexity of the studied structure, the difficulty of modelin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 雷烨盛美萍肖和业
Owner NORTHWESTERN POLYTECHNICAL UNIV
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