An Equivalent Coefficient Method for Fatigue Damage Calculation of Vehicle Structure under Combined Road Conditions

Abstract

The present invention disclosed the equivalent coefficient method of calculating the fatigue damage of vehicle structure under the condition of combined road conditions.The first step is to test the strain load of the vehicle structure under the selected combination of road conditions and prepare the load spectrum; the second step, calculate the vehicle structure damage value of the vehicle structure under the conditions of each road;The road condition is the benchmark. Calculate the equivalent coefficient of vehicle structure damage under other road conditions; the fourth step is to adjust the combination of the road conditions according to the user's needs, and analyze the corresponding vehicle structure damage.This method is based on the established fatigue load test data. When conducting car fatigue durability research, it can easily and accurately determine the amount of fatigue and damage between the roads on each road; it can be reorganized in the road test according to the requirements and goals of the user;It is estimated that the fatigue damage value of the vehicle structure can be facilitated to compare the comparative analysis of fatigue damage.

Description

technical field [0001] The invention relates to the research field of vehicle fatigue durability, in particular to a method for expressing the vehicle structure fatigue damage status under combined road conditions. Background technique [0002] Road surface roughness excitation directly causes vehicle fatigue damage. In order to determine the influence of real road surface excitation on vehicle fatigue durability, vehicle fatigue durability research is usually carried out under various enhanced road surface excitation conditions in the proving ground, and life prediction under the measured load spectrum is carried out. All major vehicle research and development institutions and large automobile companies have attached great importance to it, and have carried out a lot of research work on vehicle fatigue durability, mainly focusing on road simulation experiments under the load spectrum of the proving ground and road strengthening tests on vehicle fatigue durability. In the st...

AI Technical Summary

Problems solved by technology

The load test data under combined road conditions has not been used in depth to study the potential impact of load spectrum on vehicle structure damage, and the purpose of use is single. In order to facilitate the comparison and analysis of the influence of different road conditions on vehicle structure damage and fatigue life, it is necessary to guide enterprises to conduct test data. The full and effective utilization of the product reduces the test cost in the product development process. The present invention proposes an equivalent coefficient method for calculating the fatigue damage of the vehicle structure under combined road conditions.

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