Research On Restraint Systems For Female Drivers In Frontal Collision Conditions

At present,the number of female drivers in China accounts for one-third of the total number of motor vehicle drivers,and the proportion cannot be ignored.From a statistical perspective,women are weaker than men in terms of body size and bone density.So it is generally believed that in traffic accidents,women have a higher risk of injury or death than men when subjected to the same external impact.Therefore,studying the impact of car restraint systems on the protection of female drivers is of great significance.This article conducted a study on the constraint system of a front 100% overlap rigid barrier collision and a front 50% overlap offset collision with a female driver at a collision speed of 50km/h.The specific research content is as follows:(1)Establish a finite element model of the cockpit of a certain vehicle model and load the acceleration field obtained in the experiment.Compare and verify the driver’s motion response,head and chest acceleration curves,safety belt shoulder and belt force curves in the simulation with those in the experiment.(2)Use the finite element model of the entire vehicle to establish two frontal collision conditions,and obtain the acceleration pulses of the cockpit in both conditions through simulation.Analyze the motion response and injury characteristics of female drivers in different frontal collision conditions.Based on the analysis results,the research direction is to focus on the areas where female drivers suffer the most severe injuries.(3)Orthogonal sampling and simulation analysis were conducted on the constraint system parameters to obtain the sensitivity of the constraint system parameters to female driver injuries under two collision conditions.The mechanism of sensitivity differences under different operating conditions was analyzed,and the constraint system parameters with high sensitivity to severely damaged areas were comprehensively selected as the parameters to be optimized.(4)Taking chest injury as the optimization direction and chest compression as the optimization objective,the optimal Latin hypercube sampling and simulation of the optimized parameters are conducted to establish polynomial response surface models for the chest compression of female drivers under two collision conditions.The non dominated sorting genetic algorithm is used to optimize the parameters of the constraint system,with the constraint condition that the comprehensive damage value under two collision conditions is not higher than before optimization.