Analysis On Stiffness And Crashworthiness Of Passenger Vehicle Door

All known, the vehicle ownership with the improvement of people’s living standards increasing, the safety and comfort of the car when riding is increasingly attracting widespread attention. The door as an important part of the body, its stiffness characteristics have a significant impact on vehicle performance. However, with the increase of vehicle ownership,the traffic accidents which cause serious damage to people’s lives and property safety has increased. The vehicle is prone to side collision because of special road traffic problems and chaotic models, the passengers when vehicle crashworthiness have the highest mortality rates,according to automobile accident dates. Therefore, the simulation research of vehicle door at the same time based on stiffness and crashworthiness is of great significance.This topic is based on nonlinear finite element theory, the simulation analysis of dynamic and static characteristics and crash performance of vehicle is analyzed. For the case of stiffness and crash performance does not conform to the state laws and regulations, the thickness of the sheet metal parts and materials models is put forward to improve. The comparative simulation analysis of the improved finite element model and intrusion model of the door provides a reference for crash worthiness study of vehicle.The issue to a front door of small SUV as the research object is studied by simulation analysis. Firstly, the finite element simulation model of the vehicle is established. The low-order modal, the vertical stiffness and torsional stiffness of the finite element simulation are analyzed. The improvement scheme of the door is proposed for the issue of low stiffness value. The simulation results show that the improved vertical stiffness of the door increased by3.17%, window along the torsional rigidity of 8.94%, buffer block position torsion stiffness increased 12.38%, the improved first-order modal 36.6 Hz meet the requirements. Then, a finite element model of hit the post is established which relevant national laws and regulations in the lateral rigidity column touch test method, finite element simulation analysis on the door collision performance. The door deformation nephogram, the door of the initial resistance to extrusion 8.33 KN, middle extrusion 19.75 KN and maximum extrusion resistant 87 KN are obtained. Finally, the corresponding improvement scheme is put forward for the initial resistance extrusion pressure of the vehicle which does not meet the requirements of laws andregulations of the situation. The improved doors all the extrusion pressure resistance value increases, and meet satisfy the requirements of the laws and regulations. In the same displacement, vehicle resistance value is superior to before through simulation analysis. The ability to resist deformation of vehicle increases significantly and collision strength has been improved. It achieves the improvement goal of the door which is more conducive to protect the security of the passengers.