Irregular closed space noise model and construction method and application thereof

Abstract

The invention belongs to the technical field of computer aided design, and discloses an irregular closed space noise model and a construction method and application thereof. An impedance-admittance and Green function method is adopted to establish a theoretical model of irregular closed space structure-acoustic coupling analysis, and the theoretical model is converted into a numerical analysis model, so that compared with a previous model, dependence on a substructure analytical solution is thoroughly eliminated, and the method can be used for an actual closed space without the analytical solution. Based on the response expression of the sound pressure and the plate vibration velocity of the irregular closed space structure-sound coupling analysis, a coupling coefficient calculation formula is found by using a modal superposition method, so that the structure-sound coupling calculation becomes possible. The interaction force between the piezoelectric film and the thin plate is calculated, and the rule that the static bending moment of the piezoelectric film acting on the thin plate under the constant electric field changes along with the thickness of the film can be derived.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design, and in particular relates to a noise model of an irregular enclosed space and its construction method and application. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: From the auto show in my country in recent years, it can be seen that due to the increasingly fierce market competition, customers have higher and higher requirements for ride comfort, which makes the NVH (noise and vibration control) problem of automobiles become more and more serious. It is mandatory for customers. In the evaluation content system of vehicle NVH comfort, due to the direct perception of passengers, compared with external noise such as road noise, tire noise, and wind noise, the internal noise of the passenger cabin has a greater impact on the subjective experience of the passengers, so how to improve The auditory comfort of the passenge...

AI Technical Summary

Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: At present, domestic noise active control mainly focuses on the position optimization and control strategy of the actuator.

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