A Study on the Modelling Technique for the Passenger Out-Of-Position Simulation

There was a regulation to reduce injuries caused by airbags for OOP (Out-Of-Position) impact loading conditions. Also, many tests are needed to meet the regulation regarding design variation. And the main effect of airbag design variable has not been well known. Therefore, numerical simulation modelling method and technique were required to reduce the test numbers and recommend the airbag design guideline for OOP condition. To establish modelling procedure for OOP situations in this paper, simulation model was built and correlated with test. Also, the body block test for airbag cushion correlation, a pendulum test for opening stiffness correlation of airbag door and low risk deployment static test using 3-year-old dummy for OOP simulation correlation were performed. And, airbag door and folding condition were evaluated using full factorial DOE (Design of Experimental) technique. Finally, airbag inflator, vent hole, opening stiffness of door and friction coefficient were evaluated using orthogonal array (L₉). From the DOE results, the airbag door modelling was insignificant for In-position situation whereas it was significant for OOP modelling. And the direct folded mesh shows a good correlation for OOP condition. Especially, the direct folded mesh by MOBIS folder was validated. The OOP simulation results had been mainly influenced by the inflator model and airbag door opening stiffness.