Research On Damage And Protection Of Commercial Vehicle Drivers In Front Oblique Collision Accident

Traffic accidents damage people's sense of happiness and seriously affect social harmony and stability0.In the accident of a collision in all directions of the vehicle,the front oblique collision accident accounted for about 23%,in front oblique collisions,there are often serious personnel injuries,due to the extremely low safety configuration of domestic commercial vehicles,the damage of personnel in front oblique collision accidents is particularly serious.Therefore,the research on driver's injury in commercial vehicle front oblique collision accidents is of great significance and application value for the improvement of commercial vehicle accident depth research method,the design optimization of passive restraint system and the reduction of occupant casualties in accidents.Based on the analysis of the accident research method,taking the driver's side front oblique collision accident of a small commercial vehicle as an example,the accident information was analyzed and the accident process was reconstructed,and the collision initial conditions of the cockpit were extracted from the accident reconstruction result.The method of rigid-flexible coupling model was proposed and used to establish the model of each part of the body and trigger restraint system.Under the premise of obtaining the human body parameters,the driver dummy model was established by defining the 35 parameter method to scale the standard dummy,and the driver dummy model was positioned by the pre-simulation method and the seat belt was fitted to the dummy model.According to the accident situation,the test hammers were designed to obtain the contact characteristics of some parts in the cockpit by quasi-static local extrusion test,and after loaded the cockpit model,the stability of the whole calculation model was verified.According to the calculation results of the model,the driver's behavioral response,injury and death causes in the accident were analyzed,the rationality of the accident research results and research methods were verified by comparing the autopsy reports of actual drivers.The function of the auxiliary restraint system was analyzed and the necessity of adding the auxiliary restraint system was discussed,and finally,on the basis of adding the auxiliary restraint system,the influence of different steering angleand different airbag burst time on the driver's injury in the accident was analyzed,and some suggestions were put forward for the protection of commercial vehicle driver in the front oblique collision accident.The research results show that the collision process of the front oblique collision accident obtained during the accident reconstruction process is accurate and credible,and the cockpit collision initial conditions can be extracted from it.The rigid-flexible coupling method can shorten the cockpit model construction time and improve the accident research accuracy,and the cockpit calculation model established by the rigid-flexible coupling model has good stability.In the front oblique collision accident,the driver's body moves to the left in front relative to the seat,and the head impacts with the left side door glass and the left side of the steering wheel,and the chest impacts with the lower wheel rim of the steering wheel.Head and chest injuries are the main cause of driver death,collisions between the lower limbs and the knee bolster lead to a fracture of the left thigh and a tear in the muscles.Increasing the driver's assistant restraint system can effectively reduce the driver's injury,moderately increasing the steering wheel angle can reduce the injury of all parts of the body except the chest,moderately increasing or reducing the level T of the airbag burst time is conducive to the protection of the driver's head,and the increase of neck and chest injury is mainly attributed to the impact of the airbag during the inflation period.