Structural Design And Parameterized Optimization For Neck Of Finite Element Dummy In Frontal Impacting

With the rapid development of automobile industry,it not only brings convenience for people to travel,but also causes traffic accidents that endanger people's life and property safety.How to improve the vehicle collision safety performance and minimize or reduce the casualty of the crew has become an important subject in the research field of automobile collision safety.Countries led by the United States and Europe have developed a series of automobile safety regulations system,and the vehicle crash test is used to evaluate the safety performance of vehicle collision.Vehicle collision safety mainly includes active safety and passive safety,as a personification test device for vehicle collision test,the collision dummy plays an important role in the vehicle passive safety research.Under the background of the rapid development of computer technology,the dummy of finite element came into being,it solves the shortcoming of long period and high cost of solid dummy development.In automobile collision process,the neck injury of driving personnel is more common,and due to traffic-induced long-term sequelae,neck injury accounted for nearly half the proportion,the long recovery cycle has brought enormous pressure on individuals and communities.This paper is from the author's research group and a domestic automobile research institute cooperation development project,and combined with the Science & Technological Project of Smart Manufacturing in Tianjin supported by Tianjin Science and technology commission“The key technology research on special robot in Intelligent vehicle passive safety testing”(No.16ZXZNGX00100).This paper is devoted to the design of a new crash finite element dummy neck model applied to the analysis of the neck injury in the obverse impacting,so as to evaluate the protective effect of the vehicle on the human neck during the collision process.The main contents of this paper include:This paper analyzes the present situation of the design of the automobile crash dummy and the artificial neck in China and abroad,and discusses the importance of solving accuracy and solving time of dummy neck model in practical engineering analysis.To further rationally design the model of “anthropomorphic” dummy neck,the theory of human neck injury is studied.Starting with anatomical structure of human neck,and reference Hybrid III collision dummy neck modeling method,the idea of equivalent modeling in mechanics is introduced,a model of finite element dummy neck for vehicle collision is established,and establish a sensor between the Atlanto-axial joint to evaluate the injury of Atlas and Axis in the cervical spine.To verify the accuracy and effectiveness of the established neck model,the code for the calibration of human neck is studied,and carried out bending and stretching simulation calibration test on dummy Neck model,and the simulation animation of the calibration test is also analyzed,and verify the reliability and effectiveness of the neck structure.Using the sensitivity analysis method of material parameters,and by orthogonal test,a multi-objective optimization design agent model based on response surface is establishded,introducing weighted coefficients to combine agent model,solving multi-objective optimization problem by transforming it into single objective optimization,and using genetic algorithm to solve,the optimal material parameter combination of the neck structure is obtained,further improving the accuracy of the neck model.Based on the optimized neck model,the verification and analysis of dummy vehicle constraint calibration are carried out,by establishing the vehicle analysis model,adjusting dummy Posture,setting contact,etc.Based on the whole vehicle crash test data,the dynamic response of neck model in vehicle-constrained environment was analyzed by using C-NCAP score term.Results show that: The model of finite element dummy neck in the obverse impacting that established in this paper can meet the requirement of practical engineering analysis,and provide reference for the whole development and improvement of the anthropomorphic test equipment in the vehicle crash test.