Study On Finite Element Simulation And Test For Xiali Passenger Car Seat System

The safety problem of automobile seat includes active safety and passive safety. The active safety of automobile seat refers to the capability of seat to provide the occupant with comfortable environments. The passive safety of automobile refers to the capability of seat to avoid or reduce injury of occupant in crush. To enhance the safety of automobile is important to reduce the injury of occupant when crush happens. Although Xiali car seat structure is not quite complex, it has very strong typical and practical significance to study economic car on increasing safety of automobile seat.FEM is based on computer and it can solve complex engineering problem efficiently. The contents of this paper are based on the project, the analysis of the static strength of Xiali mechanical car seat. It uses Altair HyperMesh,LS-DYNA software to simulate the model of the mechanical seat of Xiali passenger car and analyze the static strength of seat assembly and seat back, the static characteristics and LS-DYNA characteristics of its head restrain.In chapter 1, on the base of reference a great deal of literature, the internal and external status of automobile seat passive safety research is investigated, and research and development methods, up-to-date achievements and developing trends of auto seat system are discussed, and FEM in studies on seat system are applied.In chapter 2, the mechanical seat system model of Xiali passenger car is set up with Altair HyperMesh software based on the digested software. Introduce the general flow of model setting-up. It consists of FEM skeleton seat pen,seatback,adjustment and head restrain base on the research of auto seat static characteristic. This model consists of 22275 nodes, 20503 elements, including 20402 shell elements, 64 rigid elements and 37 cweld elements In chapter 3, the boundary conditions are defined under the criteria of FMVSS-207 and ECE R17. When the seat assembly static strength is simulated, the force is defined under the criteria of FMVSS-207. The force is defined under the criteria of ECE R17 when the seat back static strength is simulated. In the result, it reveals that the seat's strength meet requirement but some points are deformed and the dangerous points are find.In chapter 4, The safety of head restrain is simulated. It includes head restrain post-displacement, static strength characteristic and dynamic characteristic. Through simulation, the safety of the head restrain of the seat can meet the requirement of ECE R17. The contents and conclusions are summed up. Also some advice on the improvement of the later research is given.The study significance of this paper is to master the general modeling flow by using FEM software Altair HyperMesh, we can supply the experience and method for later generation.Redesigned the mechanical seat of Xiali passenger car has practical significance. The FEM simulation of the mechanical seat has some value of reference when designing a seat of such a type.Carrying out the research of head restrain by utilizing LS-DYNA software, we inaugurate a new road to investigate the dynamic performance of head restrain.