Modeling of near-acoustic field of car window and optimization method of car window structure based on linear equivalent

Abstract

The invention relates to a car window near sound field modeling and car window structure optimization method based on linear equivalency. The method comprises the following steps that S1, a compression load curve of the sealing strip lip edge is obtained through sealing strip lip edge compression load tests; S2, the sealing strip lip edge is equivalent to a discrete linear stiffness spring element on the basis of a function equivalent principle, and a guide groove sealing strip equivalent constraint model is established; S3, a three-dimensional model of a car window sealing system is established by combining the guide groove sealing strip equivalent constraint model, acoustic performance analysis is conducted on the three-dimensional model of the car window sealing system, and a car window sound transmission loss characteristic curve and car window sound pressure level distribution are obtained; S4, the structure of a car window is optimized on the basis of a sound insulating material quality effect. Compared with the prior art, by means of the car window near sound field modeling and car window structure optimization method based on the linear equivalency, the modeling difficulty caused by the irregular geometric characteristic of a sealing strip is solved, the car window optimization method is put forward on the basis of the acoustic characteristics of the car window under the sealing constraint, and car window acoustic performance optimization facing high-speed muting is achieved.

Description

technical field [0001] The invention relates to the field of car window design and manufacture, in particular to a method for modeling the near-sound field of the window and optimizing the structure of the window based on linear equivalent. Background technique [0002] In recent years, with the continuous improvement of vehicle speed and the reduction of engine noise, drive train noise and tire noise, high-speed wind noise has become one of the most important noise sources in the car. How to reduce the interior noise caused by wind noise has gradually become an important content of automotive acoustics design. [0003] Due to the effect of the car rearview mirror and A-pillar, strong eddy currents are generated in the side window area, causing the wind noise problem in this area to be more prominent than other parts. At the same time, taking into account the vision requirements of car drivers, car side windows lack the necessary acoustic design. Therefore, the side window...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a linear equivalent-based near-acoustic field modeling and window structure optimization method to overcome the above-mentioned defects in the prior art, which solves the modeling difficulties caused by the irregular geometric features of the sealing strip , based on the acoustic characteristics of the window glass under sealing constraints, an optimization method for the window glass is proposed, which realizes the optimization of the acoustic performance of the window for high-speed quietness

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