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Development of Head Injury Assessment Reference Values Based on NASA Injury Modeling
Technical Paper
2011-22-0003
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English
Abstract
NASA is developing a new crewed vehicle and desires a lower risk of injury compared to automotive or commercial aviation. Through an agreement with the National Association of Stock Car Auto Racing, Inc. (NASCAR®), an analysis of NASCAR impacts was performed to develop new injury assessment reference values (IARV) that may be more relevant to NASA's context of vehicle landing operations. Head IARVs associated with race car impacts were investigated by analyzing all NASCAR recorded impact data for the 2002-2008 race seasons. From the 4015 impact files, 274 impacts were selected for numerical simulation using a custom NASCAR restraint system and Hybrid III 50th percentile male Finite Element Model (FEM) in LS-DYNA. Head injury occurred in 27 of the 274 selected impacts, and all of the head injuries were mild concussions with or without brief loss of consciousness. The 247 noninjury impacts selected were representative of the range of crash dynamics present in the total set of impacts. The probability of head injury was estimated for each metric using an ordered probit regression analysis. Four metrics had good correlation with the head injury data: head resultant acceleration, head change in velocity, HIC 15, and HIC 36. For a 5% risk of AIS≥1/AIS≥2 head injuries, the following IARVs were found: 121.3/133.2 G (head resultant acceleration), 20.3/22.0 m/s (head change in velocity), 1,156/1,347 (HIC 15), and 1,152/1,342 (HIC 36) respectively. Based on the results of this study, further analysis of additional datasets is recommended before applying these results to future NASA vehicles.
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Authors
- Jeffrey T. Somers - Wyle Integrated Science and Engineering Group
- Bradley Granderson - Wyle Integrated Science and Engineering Group
- John W. Melvin - Tandelta, Inc.
- Ala Tabiei - University of Cincinnati
- Charles Lawrence - National Aeronautics and Space Administration
- Alan Feiveson - National Aeronautics and Space Administration
- Michael Gernhardt - National Aeronautics and Space Administration
- Robert Ploutz-Snyder - Universities Space Research Association
- John Patalak - National Association for Stock Car Auto Racing, Inc.
Citation
Somers, J., Granderson, B., Melvin, J., Tabiei, A. et al., "Development of Head Injury Assessment Reference Values Based on NASA Injury Modeling," SAE Technical Paper 2011-22-0003, 2011, https://doi.org/10.4271/2011-22-0003.Also In
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