Improved Design For Passenger Vehicle Rear Seat Frame With Long Fiber Reinforced Composite Material

Recently,with the frequent traffic accidents,people pay more attention to the safety of cars.In order to constrain the production and manufacturing standards of cars,countries have introduced a variety of stringent and comprehensive safety regulations.At the same time,with the increasingly tense energy and the environment,the calls for energy-saving emission reduction are stronger and the concept of lightweight came into being.How to meet the security and lightweight of the cars to become the focus of the current stage of the automotive industry.The seat directly relates to the comfort and safety of occupants in the vehicle because of directly contact with the body among many automotive structural parts,so it concerns about the car seat research gradually.Countries have been launched related seat safety regulations to improve the safety of occupants in the vehicle.At the same time,the overall structure of the seat and body quality are inseparable,so the lightweight design of the seat has become one of the major focus for car manufacturers.At present,the means to achieve the lightweight design of the vehicle seat mainly include the optimization design of the vehicle seat structure,the updates of the manufacture and connection process of the vehicle seat and the application of the new lightweight material.It is a more extensive way to apply lightweight materials instead of traditional metal materials in the seat structure.Among many automotive lightweight materials,fiber reinforced composites have attracted much attention because of high specific strength,high specific rigidity,easy processing and low density,and have become a hotspot in many lightweight materials.This paper developed a passenger vehicle rear seat frame structure for characteristics of long glass fiber reinforced composite materials according to GB15083-2006 appendix related to vehicle seat.At the same time,the finite element simulation technique is used to simulate the test of luggage impacting seat frame structure.Experiment and simulation are compared to ensure the validity of established the simulation model and provide pre-security for structural improvements based on the model.The topology optimization and size optimization analysis of the initial LFT seat frame structure which does not meet the requirements of the regulations are aimed to seek the reasonable design of the structure.It can get the impact and its transmission,but also reflect a reasonable distribution of materials according to the optimization results.Considering the characteristics of long glass fiber composites and continuous glass fiber composites,the two kinds of lightweight design of seat frame structure with LFT and E-LFT are proposed with reference to relevant literatures.And the established simulation models simulate the impact resistances to meet the requirements of the corresponding regulations to achieve lightweight structure design according to the requirements of the regulations.At the same time,a simple seat frame structure with single EF is proposed.The test and simulation are carried out to verify the validity of the continuous fiber seat model,and the design of the lightweight structure is also provided for reference.Taking into account the processing technology of fiber reinforced composite materials,it analyzes the feasibility of process and then put forward more reasonable and feasible designs of two seat frame structures.At the same time,it introduces briefly the latest research on the seat frame structure,which aims to provide reference for the future research on automobile seats.