Noise vibration analysis method and system for automobile cooling fan

Abstract

The invention provides a noise vibration analysis method and a system for an automobile cooling fan. The analysis method comprises the following steps: calculating an unbalance excitation load according to an unbalance parameter of the cooling fan; selecting preset noise response points and preset vibration response points; establishing a response evaluation standard database according to the preset noise response points and the preset vibration response points; restraining all degrees of freedom for four tire grounding points of the whole vehicle, applying an unbalance excitation load to the mass center of the cooling fan, and carrying out response analysis on the preset noise response point and the preset vibration response point to obtain a response sound pressure value of the preset noise response point and a response vibration value of the preset vibration response point; evaluating and analyzing the response sound pressure value of the preset noise response point and the response vibration value of the preset vibration response point based on the response evaluation standard database to judge whether the noise and vibration of the cooling fan meet the noise vibration standard or not, so that the accuracy of the judgment result can be ensured.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method and system for analyzing noise and vibration of an automobile cooling fan. Background technique [0002] With the rapid development of the domestic automobile industry, consumers' requirements for the NVH performance of automobiles are also increasing. The performance of automobile vibration and interior noise has been paid more and more attention by major automobile companies. The engine cooling fan is the main source of noise and vibration. When the engine cooling fan runs at a high speed, an unbalanced force will be generated. This force will generate noise and vibration in the cab, which will seriously affect the comfort of the occupants. Therefore, it is necessary to evaluate and analyze the noise and vibration of the cooling fan. [0003] At present, the evaluation and analysis of the noise and vibration of the cooling fan is based on the subjective evaluation and feel...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose a noise vibration analysis method and system of an automobile cooling fan, to solve the problem that the evaluation result of the noise vibration of the cooling fan in the prior art is easily affected by the subjective factors of the human body and cause the evaluation to be inaccurate. The problem of wasting manpower and material resources is the problem of actual vehicle adjustment of fans or car structures

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