Crashworthiness Analysis And Constraint System Matching Based On C-NCAP

With the rapid development of the national economy,people’s demands for material life have been continuously improved,and the automobile industry has rapidly grown into a pillar industry of the national economy in this environment.At the same time as the rapid development of the automobile industry,problems such as traffic accidents and casualties have gradually emerged.The restraint system that improves the crashworthiness of the whole vehicle and the safety belt and airbag as the important components has a significant effect on reducing the casualties of the occupants.How to protect the occupant safety more effectively in the collision accident is a problem that the automobile designer must pay attention to.Therefore,this paper takes a self-owned brand SUV as the research object and uses computer simulation method to study the occupant protection in collision accidents.The main research contents are as follows:(1)According to C-NCAP,The finite element model of frontal 100% rigid wall impact analysis including body,open and close parts,seat,front / rear suspension,powertrain system and electric device is established by ANSA software.Aiming at the problem of long assembly process and complicated working procedure,ANSA / Python is used to compile plug-in to reduce assembly time.(2)The results of the safety performance of the vehicle are obtained by calculation,And the results of the acceleration at the lower side of columnb,The intrusion amount of the front coaming plate,The deformation amount of the door and the intrusion amount of the steering pipe string during the collision of the SUV are analyzed,Combined with the analysis of longitudinal beam section force,The weakness of the structure is found out.Then,the structural parameters related to the weak points are optimized according to the experience.(3)Selecting the optimal results of crashworthiness,Madymo is used to build the model of driver side restraint system including frontal impact.The subsystems such as car body model,dummy positioning,seat belt model,steering system model and AIRBAG model are defined.According to the simulation results,the body motion,the score of dummy and the injury curve of key parts are analyzed.(4)According to the better collision response of Car Body,EDTW waveform is selected to fit the car body deceleration,and a car-dummy chest deceleration model is established based on the current car model.The parameters,such as the air pocket and the limit force of the safety belt,were selected to do the orthogonal optimization test,and the test results were analyzed by range and variance.Finally,the optimal matching of driver side restraint system in frontal impact is obtained by considering all kinds of factors.