In-vehicle air noise target decomposition method based on transfer path analysis theory

Abstract

The invention provides an in-vehicle air noise target decomposition method based on a transfer path analysis theory. The method comprises the following steps: S1, measuring prototype vehicle sound source sound power and acoustic transfer function data, establishing a transfer path analysis model, and calculating in-vehicle air noise based on a transfer path analysis theory; and S2, establishing an air noise target decomposition optimization model, customizing a target function according to an actual demand by taking the acoustic transfer function of each path as a design variable and the air noise target in the vehicle as a constraint condition, and performing automatic optimization by adopting a multi-island genetic algorithm to obtain an optimal acoustic transfer function scheme. The method has the advantages that the transmission path analysis and automatic optimization theory is applied for the first time in the field of in-vehicle air noise target decomposition of the automobile, a large number of tests in the traditional experience development process are omitted, the development time and production cost of the whole automobile are saved, meanwhile, the optimal solution of the transmission path can be found through an optimization algorithm, and the phenomenon of performance waste caused by unreasonable performance distribution of the factor system is avoided.

Description

technical field [0001] The invention belongs to the field of automobile NVH performance development, and in particular relates to an air noise target decomposition method in a car based on a transfer path analysis theory. Background technique [0002] With the development of intelligent technology, cars have become more and more people's daily life space, and the NVH performance of cars is becoming more and more important. The NVH performance of automobiles can be divided according to the frequency. Below 100Hz, the main problem that affects people's perception is the vibration problem. Below 400Hz, the structural noise caused by structural vibration dominates. Above 400Hz, the air noise transmitted through the air is the vehicle interior. major components of noise. Therefore, effective control of air noise in the vehicle is of key significance for the development of vehicle NVH performance. [0003] Vehicle air noise control first requires target decomposition, that is, t...

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Problems solved by technology

Although the benchmarking method has the ability to decompose the noise in the car in a certain sense, it has a series of problems such as high cost, low precision, heavy workload, and waste of performance.

[0004] Transfer path analysis is an important means of air noise control in the car, but it requires complete sound source excitation and transfer function data. In the early stage of vehicle development, the complete data of sound source excitation and transfer function cannot be obtained. Obviously, the traditional transfer path analysis method Cannot be directly used to achieve the target decomposition of airborne noise in the car

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