Integrated Simulation Of Curve Adaptive Cruise Vehicle And Guardrail Collision

Due to the characteristic of adaptive cruise control system control strategy,when vehicle driving on curve roads,its will return to its cruising speed after the target vehicle is out of the radar range of the vehicle,but the higher cruising speed will cause the vehicle to skid out of control in curve road and collide with the guardrail.At present,researches on the lateral displacement and damage of occupants in the process of collision with guardrails under the conditions of vehicle instability and sideslip are relatively few.Therefore,the study of occupant injury during vehicle sideslipping and collision and the effect of vehicle restraint system on occupant protection is of certain guidance for today’s active-passive safety integration research.Firstly,this paper refers to a typical traffic accident case,combines Car Sim and Simulink to build a traffic accident scenario applicable to this paper,and completes the co-simulation of the vehicle sideslip process before collision.This paper takes 2010 Yaris as the research object,completes the construction and verification of the whole vehicle as well as the restraint system model;draw the curved guardrail model according to the standard"Highway Waveform Beam Steel Guardrail"（JT/T 281-2007）,builds the vehicle-guardrail collision finite element model,and sets the boundary conditions and initial conditions according to the accident scenario to obtain the vehicle motion date during collision.Secondly,the motion and damage of the dummy were simulated by using the whole process vehicle motion response curve as the boundary condition.The results show that during the side-slip process of the vehicle,the dummy has a significant lateral displacement,and the maximum lateral displacement of the head and neck reaches0.1324m and 0.1031m,which weakens the protection of the original restraint system.Occupants suffer serious injuries in the collision phase,and the maximum 3ms synthetic acceleration of the head and chest exceeded 40g,endangering the occupants’life.In order to improve the lateral displacement and occupant of occupants,the active pretension seatbelt（APS）was introduced on the basis of the original restraint system,simulation results show that APS can reduce the lateral dislocation of occupants to a certain extent before collision under the same boundary conditions.,which is more obvious on the head and chest,reaching 5.2%and 7.8%respectively;the improvement in the subsequent damage is even more obvious,head’s₃₆ decreased by 17.8%,chest’s₃₈)decreased by 9.8%,and left thigh force’s₁7))decreased by 34.1%.Finally,according to the multi-objective optimization theory,the relevant parameters of the restraint system equipped with active pre-tensioned seat belts are optimized by multi-objective.A multi-objective optimization platform was constructed using mode FRONTIER and MADYMO.The optimization results show that the damage value of each part of the dummy is reduced compared with previous results.Among them,the optimization effect of head’s₃₆,head’s₃₈),chest’s_（88）,and left thigh force’s₁)is more obvious,respectively reduced by 37.5%,18.1%,19.98%,29.84%.The results prove that matching and optimizing the relevant parameters of the restraint system equipped with active seat belts can protect the occupants more effectively.