Method for analyzing and predicting noise outside car

Abstract

The invention discloses a method for analyzing and predicting noise outside a car, which aims at overcoming the problem that the noise outside the car is difficult to be predicted in the developing and designing stage of the car product. The method comprises the steps of: 1) establishing an SEA model of the car body structure: dividing the car body into a plurality of structural sub-systems, and connecting all structural sub-systems according to the correlations; 2) establishing an SEA model for an external acoustic cavity of the car: establishing SEA models for the external acoustic cavitiesof the car at two sides and on the external surface of the car body in the SEA model of the car body; 3) determining the SEA parameter of the car body and the external acoustic cavity sub-system of the car: determining the mode density of each sub-system, determining the internal loss factor of each sub-system, and determining the coupling loss factor of all sub-systems; 4) determining the external excitation energy of the car body: determining the acoustic excitation energy of an engine cabin, determining the excitation energy of suspended engine, determining the excitation energy of unevenness of the road surface on the car body, and determining the excitation energy of the wind pressure on the external surface of the car body; and 5) analyzing and predicting the noise outside the car.

Description

technical field [0001] The invention relates to a method for analyzing and predicting the exterior noise of a car in the development and design stage of automobile products by adopting statistical energy analysis (SEA-Statistical Energy Analysis) technology applied in the field of vehicle engineering. Background technique [0002] The size of car noise is one of the important indicators to evaluate the quality of car products, which directly affects the user's car purchase orientation and the market competitiveness of products. As a mobile noise pollution source, the noise outside the car directly affects its surrounding environment, people's life and physical and mental health. With the increasing number of automobiles, in order to reduce the environmental pollution of automobile exterior noise and the impact on people's life and health, the International Organization for Standardization and various countries have formulated regulations and standards on the limits and measu...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the adoption of existing technology The traditional method to control the noise outside the car is the problem that it is difficult to predict the noise outside the car in the development and design stage of the car product. It provides a method that enables the car to predict the noise outside the car in the product development and design stage, that is, before the prototype car is developed. Car Exterior Noise Analysis and Prediction Method for Analysis and Prediction

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