Semi-infinite fluid based passenger car external noise analysis and predication method

Abstract

The invention discloses a semi-infinite fluid based passenger car external noise analysis and predication method for overcoming the defects that passenger car external noise can not be analyzed and predicted accurately before the advanced development in the passenger car development and design. The semi-infinite fluid based passenger car external noise analysis and predication method comprises the steps of: establishing a car body structure SEA (Statistical Energy Analysis) model, establishing a passenger car external noise semi-infinite fluid predication model, determining car body structuresubsystem SEA parameters, and determining external excitation energy applied to the car body and passenger car external noise analysis and predication. The establishment of the passenger car externalnoise semi-infinite fluid predication model comprises the steps of: establishing semi-infinite fluids at the left and right sides of the car body structure SEA model and connecting the semi-infinite fluids and all car body structure subsystems, wherein the semi-infinite fluids are positioned 7.5m away from a car body longitudinal symmetry plane and 1.2m away from ground and energy passes to the semi-infinite fluids from all the car body structure subsystems in the form of spherical wave.

Description

technical field [0001] The present invention relates to a method for analyzing and predicting the exterior noise of cars in the development and design stage of automobile products, more specifically, to a method based on semi-infinite fluid based on statistical energy analysis (SEA-Statistical Energy Analysis) technology Analysis and prediction method of car exterior noise in semi-infinite fluid. 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 Stan...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the currently adopted "product design, sample car trial production, noise test outside the car, sample car improvement, retesting and retesting". The traditional method of “improvement” provides a semi-infinite fluid-based analysis and prediction method for car exterior noise based on semi-infinite fluid, which can accurately analyze and predict automobile exterior noise in the development and design of automobile products, that is, before prototype development

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