| Due to the rapid growth of the number of cars,the safety performance of cars and environmental pollution caused by exhaust gas have attracted people’s attention,so the lightweight of cars has broad application prospects.The research on safety performance and lightweight design of automotive seat has the problem of high processing cost,high test cost,consuming a lot of time and manpower.Therefore,it is of great significance to use numerical simulation technology to study the static and dynamic performance of automobile seats and to carry out lightweight design.In this thesis,the finite element modeling and numerical simulation methods of the automotive seat are studied,and the lightweight design of the seat frame is carried out.The main research contents of this thesis are as follows:（1）Research on seat finite element model establishment method.This thesis analyzes the structural characteristics of the car seat and determines the main transmission path of the seat frame.Research geometry processing,meshing,material parameter setting,connection and contact setting process,research the modeling methods of angle adjuster,foam,welding,bolt and other paets or connections;Propose a more accurate finite element modeling method for automotive seat.（2）Carry out the numerical simulation and experimental verification of static and dynamic characteristics of seats.According to the enterprise,industry and national standards of seat modal test,skeleton assembly stiffness test and headrest static strength test,This thesis studies the finite element modeling methods of the above three tests,and carries on the numerical simulation analysis.According to the standard requirements of the seat,were carry out the three tests respectively to verify the accuracy of the seat modeling.（3）Research on seat frame lightweight design.This thesis analyzes and compares various lightweight design methods from three aspects of structure,material and technology,and selects the lightweight design method suitable for seat frame.Based on the application of high-strength steel,this thesis takes the minimum seat mass fraction as the objective function and the static and dynamic characteristics of the seat frame as the optimization constraints,and establishes a lightweight design model of the seat frame that integrates topology optimization,morphology optimization and size optimization.Carries out the lightweight design to get the seat frame lightweight scheme.（4）Analyse and verifies the lightweight effect of lightweight design scheme.The lightweight scheme of skeleton is analyzed and its lightweight effect is investigated.This thesis verifies the modal,skeleton assembly stiffness,headrest static strength and other performances of the lightweight design scheme by numerical simulation.Ensure that the static and dynamic characteristics of lightweight design solutions meet the requirements of relevant standards. |
