Research On Lightweight Of Automobile Rear Seat Based On Composite Materials

With the continuous growth of the number of cars,the pressure on energy consumption and environmental protection is also increasing.The production of green cars has become the future development direction,and lightweight is the key technology to achieve this goal.Lightweighting has become a problem to be solved.Seats are in direct contact with the occupant,the comfort and safety of the seat will be directly feedback to the occupant.In addition,because the weight of the seat accounts for a large proportion of the total weight in various models,the current There is also a growing interest in conducting lightweight research.The current lightweight design of seats is mainly through the use of new manufacturing processes,optimization of the seat structure and the replacement of seat metal materials with lightweight materials.There are metallic materials.Fiber-reinforced composites are widely used due to their high strength,excellent heat resistance,mature processing and molding technology,and low specific gravity.They are also the current research hotspots in automotive lightweighting.This article is mainly for the rear seat frame structure of a certain model,according to GB15083-2006 Strength requirement and test of automobile seats,their anchorages and any head restraints,the car seat's regulatory standards for lightweight design of the rear seat Static and dynamic characteristics simulation of the skeleton structure of the rear seat frame,and optimization and improvement of the designed structure.Firstly,take the model of the rear seat of a certain model as the research target,and then select the carbon fiber / epoxy resin(T300 / 5222)as the replacement material for the rear seat frame,and combine the design principles of the laminate to the back panel,back frame and cushion frame.Optimize design.The entire optimization process is mainly composed of three stages.In the first stage,the shape of each layup block is optimized by using free size optimization;in the second stage,the layer size is used to optimize the thickness of the layup bundle;in the third stage,the stacking order optimization module isused to further optimize Optimize the order of layers in each direction.The optimization results show that the weight of the composite rear seat frame can be reduced by optimizing the design,and the optimization effect is obvious.Secondly,the modeling software CATIA is used to build a three-dimensional model of the rear seat skeleton.According to GB15083-2006,the three-dimensional model of the metal rear seat was completed using the Hyper Works software to complete the analysis of the static strength of the assembly and the static strength of the flip.The seat study provides relevant data.Then,the optimized composite rear seat is simulated and analyzed under the same working conditions as the metal seat.The Tsai-Wu criterion is selected to check the strength of the laminate.The laminate theory is used to solve the composite rear seat.Stiffness matrix.Considering the economy and the feasibility of processing,the size optimization is used to optimize the metal components of the composite rear seat to further reduce the weight of the seat frame.Finally,the dynamics of composite rear seats is analyzed.The results of the modal analysis show that the natural frequency of the first-order rear seat of the composite material is greatly improved,so no resonance occurs.Through the luggage block impact simulation of the rear seat frame,the safety of the composite rear seat frame has been improved,which can meet the requirements of national regulations on the safety of rear seats.Through the analysis of the composite rear seat frame,and the results show that the structural strength of the composite rear seat meets the regulations,and further improves the safety and comfort of the rear seat,and the composite rear seat frame It reduced weight by 41.6%,which effectively realized the weight reduction of the seat,and provided a certain reference value for the optimization design and manufacturing of subsequent car seats.