Vehicle Frontal Impact Analysis And Driver Restraint System Safety Assessment

In recent years, with economic development, there is a significant increase in car ownership. As a transport to people’s life, modern car bring a lot convenience and fun to people, at the same time, which caused the accident will bring great threat and harm to human life and property. Accidents statistical analysis showed that active safety to prevent accidents avoided only 5% of the accidents, whether from the automobile production enterprise of quality development point of view, or from the government’s social management perspective, study on the passive safety of automobile collision is extremely important.In this paper, real vehicle tests in the 100% frontal collision for a certain type of car, according to the general principles and the process of modeling, established the finite element model of vehicle and the rigid wall in frontal impact. The modeling process including geometric model for cars reasonably clean up and simplify, quality control grid and grid according to certain rules, determining the reasonable selection of element type, contact type and welding method, simulation of rigid wall, according to the actual situation of the nonlinear material property, real car collision test reference case definition the initial conditions and boundary conditions.The use of Is-dyna, hypermesh, hyperview and other software for vehicle 100% frontal collision simulation analysis. Refer to the relevant regulations and commonly used method, comparison real vehicle test data, the simulation results were automotive passive safety assessment, comparative analysis including vehicle deformation, B column, A column bending angle acceleration, cowl panel intrusion and vehicle energy change.All the fundamental safety performance is the safety of personnel inside the vehicle. To ensure the safety of occupants, not only rely on the body to absorb crash energy absorbing components and structural integrity of the passenger compartment, even more important is the use of restraint systems for occupants to decelerate buffer. To further analyze this paper on car safety performance assessment, this paper will be defined as stationary cockpit, to the dummy H-point input B pillar lower acceleration curve to simulate car driver suffered during a collision acceleration deceleration, then the actual driver load restraint system the basic characteristics of the occupant into the existing parts of the dummy model and the model, so that the driver restraint system established model.Use ls-dyna, hypermesh software and hyperview to simulation analysis the driver restraint system. Reference the related laws and regulations and formula, assessed the safety of simulation results, including the dynamic response of dummy movement during a collision, the seat belt force data, dummy head injury indicators, dummy neck injury indicators, dummy chest injury indicators, numerical dummy waist injury, lower extremity injury indicators and dummy completely damage evaluation.