Research On Occupant Protection Of Far Side Collision Base On THUMS Human Model

The safety of occupants in car is undoubtedly associated with the ability of crashworthiness and safety countermeasures.Thus,vehicle safety is one of the most crucial parts of current automobile industry.At present,the Far side collision research is barely studied by engineers in domestic.While some of the foreign research institutes have accomplished some groups of experiment,aiming to carry out the determining factors of occupant injury during a Far side impact.The 2015 Euro-NCAP work plan illustrated that the relative protocol laws and regulations for Far side collision would be released within the next three years.Such study is not only beneficial to improve the safety of the vehicles,but also to guide the direction of safety development.This thesis mainly aims at studying the injury of occupants in Far side collision condition,especially for the Far side occupant.Firstly,the fundamental principle of biomechanical injury is indicated and the significant factors determining the level of injury were induced,including age,sex,weight,vehicle internals,center panels,seats position and configuration of restraint system,etc.Secondary,using the WorldSID dummy,the accuracy of the entire sled FE(Finite Element)model is verified by benchmarking the result between the experiment and simulation.Then by replacing the THUMS human model,the comparison of the two models' injury is carried out,showing highly corresponding performance.The accuracy of THUMS damage gaining ability,therefore,is verified.Moreover,the potential of THUMS human model is demonstrated which could be concluded by diverse and intuitive.Subsequently,by using accurate acquisition ability of injury,the thesis analyzes the injury level of Far side collision under variety configurations of constraint system.Base on the orthogonal test method,the quantity of the test is triply reduced.Meanwhile,the optimal configuration of the interior structure and the restraint system is achieved by combining the result of each part of the body.In order to further explore the suitable structure of the vehicle and constraint system configuration,the structure of a SUV vehicle is optimized through the contrast of THUMS human models' damage in simulation.While the shoulder webbing in its reasonable position,adjusting lower and afterwards the upper belt anchor can prevent the shoulder of the occupant from slipping out of the shoulder belt.In addition,setting the height of center panel lower than the seat cushion will dramatically reduce chest injury.Last but not least,equipped with side airbag between the two occupants can effectively prevent the Far side one hit the individual or vehicle structure on the other side.Overall,the research in this paper shows that the existing process of vehicle design and constraint system does not take into consideration of the Far side impact circumstance.More in-depth research should be initiated to improve the safety of the car crash.Based on the study of the Far side impact,the conclusion will guide the safety design of the vehicle.This research can not only effectively enhance the safety of vehicle in Far side impact,but also improve relevant laws and regulations.