Structural Design Of Lumbar Support Mechanism And Finite Element Analysis And Optimization Of Automotive Seat

"Safety, environmental protection, economic fuel" are the greatest subjects of automotive industry development at the present age. Currently, with more ordinary family owning automobiles, Vehicle safety becomes the focus of people's attention. Meanwhile, People take more and more attention on the occupant protect of car seat.Seat safety includes two aspects, which are static and dynamic characteristics. Static strength properties refer to seat strength in static load, while dynamic strength properties refer to the seat system's ability of energy absorbing and reducing occupant injury under impact load. Combining homebred certain type car seats in this paper, the static and impact performance are deeply studied by FEM, and improved the structure of this seat. The main contents of this thesis are as follows:Firstly, this paper proposes and designs a new project of lumbar support structure and establishes the 3D geometrical model in CATIA software, and explains the movement principle of the structure in detail. Then the finite elements model of this automobile seat is set up with HyperMesh software.Secondly, Reference domestic and foreign seat static strength requirements of the relevant regulations, the property of car seat system static strength, back frame static strength, head restraint static strength and head restraint post-displacement are analyzed in OptiStruct software, then optimizes the seat structure through this software optimization module. The size and weight of the car seat is improved.Finally, this paper integrated methods which to establish various collision models. Using the LS-PrePost software set simulation environment based on the technical requirements of car seat dynamic structural properties. Then the dynamic finite element model of automobile seat car collision test is established. According to the test data of 56km/h collision condition set simulation acceleration, and this FEM model is calculated by LS-DYNA software. The dynamic response property of car seat was analyzed in the simulation of collision experiment. Analysis results show that the front seat has energy absorption, and has a protective effect on the human head in the process of impact. Therefore, the seat restraint system is to meet safety requirements.