Automobile headlamp structure fatigue life analysis method

Abstract

The invention discloses an automobile headlamp structure fatigue life analysis method. The method comprises the steps that 1a, road spectrum data are collected and corrected; 1b, corrected road spectrums are simplified and calibrated; 2, environment temperatures in winter and summer are simulated respectively, and internal temperatures on the turn-on condition and the turn-off condition of a headlamp are simulated to obtain headlamp temperature field data on four conditions; the time scale between turn-on condition and turn-off condition of the headlamp is determined according to a market survey result, and temperature field combination data are established; 3, a headlamp assembly finite element model is established, thermo-physical properties and mechanical properties of all parts are input into the headlamp assembly finite element model, contact relations and assembly relations between all structures are defined, the temperature field combination data are imported, road spectrum simulation is applied, the thermo-mechanical coupling stress strain response of an automobile headlamp assembly structure within one cycle is calculated, and the thermo-mechanical fatigue life of the headlamp is calculated through fatigue analysis software. By means of the method, the fatigue life of the headlamp can be predicted at the design stage.

Description

technical field [0001] The invention belongs to automobile testing technology, in particular to a method for analyzing the fatigue life of an automobile headlight structure. Background technique [0002] With the increasing competition in the automobile market, automobile manufacturers pay more and more attention to the fatigue life of vehicles. As the main lighting equipment of the vehicle, the structural reliability of the automobile headlight directly affects the maneuverability and safety of the vehicle. At present, at the early stage of the design of the car light structure, the assembly relationship with the vehicle and the realization of optical performance are mainly considered, and its life is only evaluated through tests in the product verification stage. There is no sufficient means to predict its fatigue life in the design stage. There are many headlight failures caused by fatigue damage. [0003] The headlights are subjected to random loads transmitted by the ...

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Problems solved by technology

[0004] Large-scale finite element models cannot deal with long-term time-domain signals, and the time-domain signals need to be simplified, and how to ensure the accuracy of the simplified load has always been a problem

At present, for the fatigue calculation of random loads, the time domain signal is usually converted into a frequency domain signal, and the transfer function method based on the power spectral density (PSD) load spectrum is used to solve the problem. This method cannot consider the impact of temperature changes on the structure. There are great limitations, and the accuracy of calculating the fatigue life of headlights is low

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