Research On Crash Simulation And Crashworthiness Optimization Of A Vehicle Based On Various Crash Conditions

In recent years,along with the development of the automobile industry and the increase of people’s demand,the number of the car is increasing faster.The increase in the frequency of traffic accidents has caused severe economic losses to the country and people.Car safety performance is related to human life safety,so improving car safety is an indispensable process in the development and design of cars.Automotive safety performance mainly involves active safety performance and passive safety performance.Passive safety systems work after the failure of active safety systems.This thesis focuses on the passive safety performance of automobiles.At present,research on a collision to optimize the car cannot fully guarantee the safety of the occupants.Therefore,it is necessary to conduct a comprehensive study on the collision safety of automobiles in the context of studying multiple collisions to improve the crashworthiness of automobile structures.This thesis studies the collision simulation and crashworthiness optimization of passenger cars based on various collision conditions,and uses CAE simulation technology to study a passenger car’s forward collision,offset collision,and side collision.First,according to the finite element modeling principles,a finite element model of the entire vehicle and three barrier collisions is built to simulate the front of the vehicle 100% Rigid wall collision,front 40% deformable barrier offset collision,lateral deformable moving barrier collision process,and then output three K files into LS-DYNA calculation to obtain a series of simulation result files.After verifying the reliability of the model solution data based on the energy management principles,the thesis evaluates the collision safety of the car by in-depth analysis of the solution 0data of the above three collision models.The analysis results show that the crashworthiness of the car is weaker in the front structure and the side structure,which needs to be further optimized.In the optimization phase,several schemes for optimizing the multiple structures of the vehicle is proposed based on the simulation results.The three structural optimization schemes are adding new components to the front-end support structure of the car,changing the support type of the support bar in the door,and optimizing the reinforcement bar structure in the threshold.In addition,a scheme for optimizing the thickness of the bumper,front side member,front panel,engine compartment inner panel,B-pillar inner panel,B-pillar reinforcing plate b,and sill inner reinforcing plate was also proposed based on orthogonal tests.At the end of this article,the optimization schemes were verified through simulations of three collisions.The conclusion of the analysis is that the combination of multiple optimization schemes can improve the safety of front and side collisions of the car.This thesis theoretically demonstrates the feasibility and effectiveness of various optimization schemes,which can provide a certain reference for the study of comprehensive multi-collision conditions to improve automobile crash safety.