Automobile headlamp structure fatigue life analysis method

A fatigue life analysis, automotive headlight technology, used in the testing of machine/structural components, measuring devices, instruments, etc., can solve the problem of load accuracy, low fatigue life accuracy of headlights, and cannot consider temperature changes. The impact of structure and other issues can save costs and shorten the development cycle.

Active Publication Date: 2015-01-21
CHONGQING CHANGAN AUTOMOBILE CO LTD
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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

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  • Automobile headlamp structure fatigue life analysis method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing:

[0021] like figure 1 The fatigue life analysis method for the automobile headlight structure includes the following steps:

[0022] Step 1. Headlight mechanical load processing

[0023] 1a. Acquisition and correction of road spectrum data: install a three-way vibration acceleration sensor at the connection between the headlights and the body, according to the road section requirements of the vehicle road reliability test at the proving ground (this road section consists of pothole roads, pebble roads, washboard roads and Road spectrums of roads of different grades such as Belgian roads combined in proportion), collect combined road spectra of different grades of roads, use high-pass filtering method, balanced skew method and least squares method to correct the collected road spectrum data, and eliminate Singularities and trend terms due to systematic disturbances. The sp...

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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 ...

Claims

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Application Information

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IPC IPC(8): G01M11/08
Inventor 唐牧关鹏辉杨海琳刘泉镇张庆
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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