Vibration frequency test and durability assessment method for exhaust system

Abstract

The invention provides a vibration frequency test and durability assessment method for an exhaust system, and the method comprises the steps: arranging the exhaust system on a vibration exciter according to a whole vehicle arrangement relation, and carrying out the vibration frequency test of the exhaust system through the vibration exciter; under a preset vibration acceleration, scanning vibration is conducted on the exhaust system from low to high at a preset speed, and scanning vibration is conducted again from high to low; acquiring a strain value of each preset assessment position in the exhaust system, and determining a resonant frequency of each preset assessment position based on the strain value; staying vibration is carried out at each resonant frequency, and the vibration acceleration is gradually increased until the strain peak value of any preset assessment position is matched with the maximum strain value of the whole vehicle test; and the durability of the exhaust system is examined and evaluated. The exhaust system is tested and assessed by adopting the method, and the defects that in the prior art, the test and assessment cost of the exhaust system is high, and the test result does not have too high reference value can be overcome.

Description

technical field [0001] The invention relates to the technical field of automobile testing, in particular to a method for testing the vibration frequency and durability of an exhaust system. Background technique [0002] As the exhaust system of automobiles, a reliable exhaust system is not only a design requirement of OEMs, but also a requirement for environmental protection, carbon neutrality and carbon peaking. Among them, the engine is a vibration source, and the accessories connected to it will also be affected to generate vibration. If the exhaust system design is unreasonable, the vibration frequency coupled with the engine vibration frequency will cause resonance or stimulate the maximum strain. Therefore, the vibration of the exhaust system will be affected. It is necessary to determine the frequency, and at the same time, it is necessary to carry out the endurance verification to evaluate whether it is qualified. [0003] The test and assessment of the exhaust syst...

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Problems solved by technology

[0005] Based on this, the purpose of the present invention is to provide a vibration frequency test and durability assessment method of the exhaust system, which aims to solve the problems of the high cost of exhaust system testing and assessment in the prior art, and the test results do not have too high reference value

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