Method for calculating mid-frequency transmission loss of subsystems and optimizing acoustic packages

A transmission loss and subsystem technology, applied in computing, special data processing applications, instruments, etc., can solve the problems of low mid-frequency calculation accuracy, inability to design acoustic packages, and difficulty in taking into account accuracy and efficiency, and achieve optimal design. Effect

Inactive Publication Date: 2015-12-23
同济汽车设计研究院有限公司
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Problems solved by technology

For the mid-band, both methods are difficult to balance accuracy and efficiency
In terms of calculating the transmission loss of the subsystem, the SEA method is mainly used in engineering to calculate

Method used

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  • Method for calculating mid-frequency transmission loss of subsystems and optimizing acoustic packages
  • Method for calculating mid-frequency transmission loss of subsystems and optimizing acoustic packages
  • Method for calculating mid-frequency transmission loss of subsystems and optimizing acoustic packages

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Embodiment Construction

[0047] The application will be described in further detail below in conjunction with the accompanying drawings.

[0048] figure 1 A flow chart of a method for calculating the frequency band transmission loss in the subsystem and optimizing the acoustic package according to the present application is shown.

[0049] The method includes step S11, step S12, step S13 and step S14. Specifically, in step S11, a model for calculating the overall transmission loss of the subsystem is established based on Hypermesh software and VAOne software; in step S12, the overall transmission loss of the subsystem is calculated; in step S13, by comparing the The transmission loss and the overall transmission loss determine whether each subsystem belongs to a weak area or a non-weak area; in step S14, the acoustic package is optimized according to the optimization objective and whether each subsystem belongs to a weak area or a non-weak area.

[0050] The present application will be further descr...

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Abstract

The invention aims to provide a method for calculating mid-frequency transmission loss of subsystems and optimizing acoustic packages. According to the method, a model for calculating the transmission loss of the whole subsystems is established on the basis of Hypermesh software and VA One software, the transmission loss of the whole subsystems is obtained through calculation, the transmission loss of each subsystem and the transmission loss of the whole are compared, whether each subsystem belongs to a weak area or a non-weak area is determined, and the acoustic packages are optimized according to an optimization objective and a result whether each subsystem belongs to the weak area or the non-weak area. Compared with the prior art, the method adopts a hybrid FE-SEA (finite element-statistical energy analysis) method, a finite element model is divided into a plurality of FE subsystems, a comparison diagram of a mid-frequency transmission loss curve of each FE subsystem at the mid-frequency band and a transmission loss curve of the whole is obtained rapidly and accurately through calculation, whether each subsystem belongs to a weak area or a non-weak area is determined and the FE subsystems are subjected to different arrangement on the basis of the optimization objective, so that the purpose of effective optimization design of the acoustics packages can be achieved.

Description

technical field [0001] The present application relates to the field of vibration and noise analysis, and in particular to a technique for calculating transmission loss in frequency bands in subsystems and optimizing acoustic packages. Background technique [0002] In order to improve the user's driving experience, it is usually necessary to install acoustic packages made of some acoustic materials with sound absorption or sound insulation functions in some key parts of the car to reduce the noise transmitted to the passenger compartment, such as the sound insulation pad of the front wall of the engine compartment , sound-absorbing materials for interior parts, plugging of each leakage hole, and the location of expansion glue for sheet metal parts are all applications of acoustic packages. [0003] Vibration and noise analysis methods mainly include: finite element method (FiniteElementMethod, FEM), boundary element method (BoundaryElementMethod, BEM) and statistical energy a...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 吴宪王丁邵建旺
Owner 同济汽车设计研究院有限公司
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