Simulation Research On Vehicle Light Vibration Based On Temperature And Fatigue Effect

As the eyes of the vehicle,the headlights of the car are a special type of car.The lights mainly help the driver to drive safely at night,and also have a safety reminder for others walking at night.However,the vehicle is subject to interactions such as driving speed,road conditions,driving environment,and travel time,and structural failure occurs in the structure of the lamp.Failure of the lights will result in safe driving at night,causing inconvenience to people driving at night,and may cause traffic accidents in severe cases.In this regard,using theoretical analysis and performance testing methods,the causes and phenomena of the vibration failure of the lamp are analyzed.It is of practical significance to study the failure analysis caused by vibration fatigue of the lamp structure.In this paper,the finite element software of ANSYS version 18.2 is used,combined with the finite element method and dynamics analysis theory,the finite element model of the lamp is established for the structural characteristics of the modern lamp and the characteristics of the working environment.In the modeling step,the components of each part of the lamp are reasonably simplified,and the connection mode between the components is adopted,and the combination of the solid connection,the coupling,the spring unit and the spring unit coupling is adopted for different parts of the link.In the modeling mode,the parametric modeling method of multi-physics sequential coupling is adopted,which avoids the problem of modeling and correction of complex structures in the finite element modeling process.The research work of the thesis mainly has the following four points: 1.First,the structure is processed by the finite element analysis software ANSYS to obtain the dangerous position of the structure under thermal load conditions,and predict the thermal fatigue life of the lamp structure under heat load and underne ath.2,select the same car light model,modal analysis of the lamp structure under normal temperature conditions,determine the reliability of the car light model according to the modal structure,and then perform random vibration analysis on the structure based on the modal state,and Through the stress-strain distribution of the lamp body,using the Manson-coffin high-cycle fatigue empirical formula,the Miner linear damage theory and the Gaussian distribution Steinberg model are used to predict the fati gue life of the lamp structure,and the service life of the lamp structure under vibration conditions is obtained.3.The thermal stress generated by the thermal fatigue analysis of the structure is taken as the loading load to analyze the random vibration fatigue of the structure.The method of solving the thermal fatigue life and random vibration separately is used to solve the fatigue life of the lamp under the corresponding state.And then use the principle of incremental damage superposition to estimate the fatigue of the lamp structure during the coupling of the heat engine.Life.4.On the basis of the experiment,the predicted value of the fatigue life of the structure is verified.In the test process,the accelerated life formula is used to shorten the test time,and the previous simulation analysis is used to verify the structural life prediction.Through the study of these four lines,the fatigue life of the lamp is solved separately,and finally the accuracy of the simulation prediction is verified by experimental verification.The establishment of finite element vehicle lamp model and vehicle lamp simulation analysis expands the design idea of the lamp,and plays a reference role in the analysis of the failure problem of the lamp under similar working conditions,laying a reference for future lamp design and inspection basis.