Passenger car lower swing arm transient fatigue analysis method and device

Abstract

The invention relates to a passenger car lower swing arm transient fatigue analysis method and device, and relates to the technical field of fatigue calculation. The passenger car lower swing arm transient fatigue analysis method comprises the steps of firstly decomposing a lower swing arm load, calculating and obtaining a lower swing arm connection point load spectrum in combination with wheel center six-component data, then calculating and obtaining modal coordinates of the lower swing arm by using the lower swing arm connection point load spectrum, establishing a finite element mesh model of the lower swing arm according to a three-dimensional model of the lower swing arm, calculating the modal stress of the lower swing arm; utilizing the modal stress and the modal coordinates to calculate the transient stress of the lower swing arm, and finally calculating the fatigue life of the lower swing arm based on the transient stress. According to the passenger car lower swing arm transient fatigue analysis method and device, the modal coordinates of the lower swing arm are obtained through transient response analysis, then the transient stress is obtained by combining the modal stress, then the fatigue life of the lower swing arm is obtained through calculation, the calculation defect of a traditional unit load method is avoided, and the calculation result is more accurate.

Description

technical field [0001] The present application relates to the technical field of fatigue calculation, in particular to a method and equipment for transient fatigue analysis of a lower swing arm of a passenger car. Background technique [0002] At present, the suspension system, as an important part of the automobile system, is an important part to ensure driving safety. The technical condition and stability of the suspension system have a great impact on the performance of the automobile and the safety of the vehicle under the limit state. It is also one of the important indicators currently used to measure the quality of cars. The lower swing arm is one of the important components of the suspension system. If the lower swing arm breaks or fails during use, it will bring very serious consequences. Therefore, the durability performance analysis of the lower swing arm structure in the product design stage Forecasting becomes even more important. [0003] In related technolog...

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Problems solved by technology

[0009] The embodiment of the present application provides a transient fatigue analysis method and equipment for the lower swing arm of a passenger car to solve the problem in the related art that the calculation result and the actual result have large errors when using the inertia release method for the calculation of the lower swing arm of the car

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