Author: Z. Jerry Wang and George Hu—Humanetics Innovative Solutions, Inc.
Abstract
Injury risk functions (IRF) for the THOR-AV 50th percentile male dummy were investigated in this research. The investigation focused on the areas where design changes were made. The dummy test data used in the injury risk function development are a combination of physical tests and finite element (FE) model simulations. For some postmortem human subject test cases where physical dummy tests were not available, the Humanetics THOR-AV finite element model (v0.7.2), which was validated in numerous test conditions, was used to generate data quickly. This was done with the understanding that the final IRF with full physical test data may provide better accuracy. In the analysis, log-logistic, log-normal, and Weibull survival functions were fitted with 95% confidence intervals. The Akaike Information Criterion, Goodman-Kruskal-Gamma and Area under the Curve of Receiver Operation Area were used to estimate the prediction strength and relative quality for final injury risk function selections. The lumbar Fz is the best indicator for lumbar spine injury, followed by Lij. The Fz injury risk values at 5%, 25%, and 50% probabilities are 2170N, 3560N, and 4856N for MAIS2+ respectively. The Lij injury risk values at 5%, 25%, and 50% probabilities are 0.44, 0.65, and 0.79 for MAIS2+ respectively. Abdomen APTS sensors are not a strong indicator for abdomen injury prediction. The APTS injury risk values at 5%, 25%, and 50% are 128, 209, and 268 kPa for MAIS2+ respectively. The total ASIS force from the left and right ASIS load cells is a better injury predictor than the maximum ASIS load cell. Total ASIS force injury risk values at 5%, 25%, and 50% probabilities are 542, 1872, and 3522 Newtons for MAIS2+, respectively.
Type: Full Paper