The main objective of the paper is to develop an analysis method of the mechanisms that controls the behavior of the H-III neck, thorax, and lower extremity injuries in a USNCAP and Euro-NCAP frontal impact. The analysis method will be utilized within the engineering design of safety systems to obtain optimal injury values. For this research were conducted in 5 steps.

Step1. Load path analysis based on numerical simulations, crash tests and 6 sled tests of various conditions with extended instrumentation (ex. Angular rate sensors, Rib-Eye). The numerical models were validated with the sled test data, to allow analysis of the load path mechanisms.

Step2. Sensitivity analysis of the safety system and dummy sub-systems with validated models. The subsystem simulation study was conducted in detail for finding out physics of the load paths mechanism and the sensitivity of the injury value characteristics.

Step3. It was going to a systematic approach to injury mechanism through the kinematics. Then, relations between kinematic and physical load paths were characterized.

Step4. Details analyze the effects on each part for various pulse and safety restraint components. Then it will be showed effectiveness guidelines of various safety restraint components.

Step5. 4 sled test for confirmation. Finally, the study resulted in identification of the mechanisms that mainly affect neck, thorax and lower extremities injury values. Based on the mechanism analysis, design guidelines could be help to safety system design of the target performance.