Occupant Safety Research Of Front Impact Based On Finite Element Model

Vehicle collision safety protection is one of the necessary to consider the performance of automobile research process.In vehicle frontal crash test and simulation analysis,hybrid ? dummy is usually used for occupant injury assessment and research.However,hybrid ? dummy can't intuitive reflect the occupant injury,especially internal organs,ligaments and other soft tissue injury.This paper based on an SUV(sports utility vehicle)component test and frontal crash test,established of a reliable finite element Model of constraint system,and used a human body model,the fourth generation THUMS(Total Human Model for Safety)for the occupant to research occupant injury in frontal crash.Firstly a finite element constraint system of Hybrid ? model was established and validated according to the experimental data.Then the occupant dummy model was replaced with the THUMS human body model to research its dynamics response and biomechanics of reflection,and the injury mechanism of the human body and evaluation criterion were studied;Finally chest injury were optimized using the method of Design of experiment(Design of experiment,DOE).In this article,a frontal impact restrain system simulation method was developed based on the finite element analysis method,including air bags,seat belts,seat substructure.It was used for the study of an SUV frontal impact occupant safety protection.The analysis results show that THUMS's head,legs,without risk of injury;the strain of Ribs is more than 3%,the chest compression quantity achieved 38 mm,concise chest damage grade level 3(AIS3)probability of 30%.As a result,the collision conditions are most likely to be injured the chest.Through the analysis of the DOE to restrain system optimization,THUMS mannequins chest rib strain was reduced by 27%,chest compression reduced 21%,internal organs strain was reduced by 18%,the probability of chest injury is greatly reduced,increased the safety protection of occupant chest.Moreover,The THUMS human body model can be intuitive and efficient for occupant injury location and degree of injury assessment and prediction,for the occupant protection.It plays a positive role for biomechanics research.