Study On Simulation Accuracy Of Commercial Vehicle Sliding Door Components

The sliding door retention component is a system which connects the door and body.It includes the guide rail of sliding door and other supporting parts and has an effect on vehicle’s passive safety performance directly.When accident occurs,the sliding door assembly can prevent passengers from flying out of the car or stucking in the gap between the sliding door and the vehicle body which may cause second damage.Automobile safety accident statistics show that a high probability of second injury occurs between the sliding door and the body gap.Therefore,many people pay attention to the passive safety performance of sliding door retention.In order to reduce this accident,our government formally carried out GB15086-2013 on January 1,2015,which made some changes on M1 vehicle such as load size and position,and these alters put forward higher request especially for hook and lock pin.The implementation of new regulations can not only improve vehicle’s passive safety,but bring the problem of low simulation accuracy.There are many factors have an effect on simulation accuracy of sliding door retention components,including material strain rate effect,body model,loading method,mesh quality,spot weld distribution and quality,the symmetry of both sides body structure etc.The key content of this investigation is how to balance these factors’ influence on sliding door retention components simulation accuracy and computational efficiency and provide a reference for building other simulation models when making a choice between simulation accuracy,modeling efficiency and workload.It’s discussed that the influence of loading method,model vehicle,strain rate and on sliding door retention components simulation accuracy in this paper.By comparing the impact of different loading time on the maximum separation distance of sliding doors and door frames,kinetic energy of the system,it’s found that non real dynamic effect can be controlled very well when loading time is 5 times the minimum period of vibration.The sine and ramp functions are used to research the control condition on the high frequency vibration of simulation model,which indicate that the ramp function is more reasonable.It is being analyzed that the degree of influence of vehicle body model on the maximum separation distance,load displacement curves and body deformation;The results shows that full vehicle body is better.Besides,the calculation time can be accepted by engineering practice.By comparing the experiment results with simulation results of material strain rate,it is shows that the tolerance of simulation with test is relatively small.Therefore,the influence of strain rate is small,the quasi-static simulation mode can be used for analysis.In conclusion: there is a huge improve of simulation accuracy when the loading time is 100 ms,the holding time is 20 ms,the loading function is sine function,the body model is full vehicle model.Besides,it can also reduce cost and shorten the development cycle,which have a significant meaning for establishing the simulation model of sliding door retention components.