The Influence Of Middle Hinge Structure Parameters On Sliding Door's Dynamic Characteristic And Its Optimization

With the development of the automobile industry,in order to meet the needs of many consumers,China's auto market has a large number of MPVs and micro cars.MPV is multi-purpose vehicle which has a large passenger space as station wagons,the car`s comfort and good function of loading cargo.As is cheap and has a wide range of uses,Micro car has high market shares in rural car market.The sliding door is an important body component of micro-car and MPV,and its smoothness of sliding door motion process has an important impact on the experience of the customer.So,the study of the sliding door smoothness has great significance.The simulation analysis of multi-body system dynamics is an effective method to study the smoothness of sliding door motion process,by the means,the sliding door performance can be evaluated and improved in the early stage of automobile design to avoid the waste of rectification resources.Therefore,the study of smoothness of the sliding door motion process based on the multi-body dynamics method has great significance.In this thesis,the sliding door of a MPV was taken as the research object.Based on the three-dimensional model of sliding door,the multi-body dynamic rigid-flexible coupling model of sliding door system is established.At the same time,getting the sliding door motion acceleration test date by the test of the MPV left middle door.Based on the the multi-body dynamic model of sliding door system,simulating the experiment process of the MPV left middle door test in ADAMS software to get the simulation data,then,comparing with the real vehicle experiment data,it is found that they have a high degree of agreement,which indicates that the multi-body dynamic model of sliding door system has certain reference and reliability.Based on the simulation model,the influences of the middle hinge pin position,torsion spring parameter of middle hinge and the guide wheel spacing of middle hinge on the smoothness index of the sliding door motion process which is the force of the guide wheel,the acceleration of sliding door and the velocity of sliding door are studied.Then,the smoothness of the sliding door motion process is optimized by using ADAMS/Insight.After optimization,under the same driving force,the average door opening speed increased by 19%,the max stress force of the guide wheel decreased about 27%,and the peak value of acceleration curve of sliding doordecreased by 11%.So the quality of sliding door system has efficiency improvement.Finally,the reliability of the optimal design of sliding door smoothness is verified by a real car experiment.The influence of middle hinge structure on smoothness of sliding doors proposed in this paper provides theoretical guidance for the structural optimization of the middle hinge in the sliding doors of other vehicles.Applying this analysis method to the early design process of sliding door system will improve design efficiency and quality of sliding door and save costs.