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Analysis of occupant dynamics and optimization of Driver airbag performance against all FMVSS208 frontal impact cases using validated Finite element Methodology
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 21, 2019 by SAE International in United States
Event: NuGen Summit
Several people die every year due to vehicle accidents. Federal Motor Vehicle Safety Standards (FMVSS) are U.S. federal regulations stating design, structure, performance, and durability necessities for vehicles. The objective of a crash test for FMVSS No. 208 is to measure how well a passenger vehicle would protect its occupants in the event of a frontal crash. FMVSS 208 consists of series of tests including different impact surface type as well as occupant sizes. It also covers the belted and unbelted occupant behavior at the time of front impact. Each test scenario has different ways to injure the occupant. Airbags are the part of passive safety equipment family in any automobile and play an imperative role to reduce the occupant head and chest injuries at the time of crash or accidents. This study covers the evaluation of airbag performance in all FMVSS 208 load cases using validated Finite Element Methodology (FEM). Finite Element Analysis (FAE) is an advanced tool to simulate the airbag behavior. Airbag deployment phenomena is very complex in nature and depend on several parameters like folding pattern, vent hole behavior, volume etc. System models were developed for all FMVSS 208 load cases using LS-Dyna. First the airbag model was developed using LSDYNA. The inflator model was validated against tank test results obtained from inflation test. The model was again validated against static pressure test results first. Airbag deployment process was found to be in good agreement with the test results. Further detailed system level simulation with hybrid III dummies was simulated to analyze the performance of airbag.