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

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...

AI Technical Summary

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 the middle and high frequency bands, which reduces the calculation accuracy of the middle frequency band and makes it impossible to reasonably design the acoustic package of the corresponding subsystem

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