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A Review of the Severity Index
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English
Abstract
The SAE Severity Index is supposed to be an approximation to tolerance limit data, but there are incongruities in its derivation which renders the formula unsupportable. The same logic on which the Severity Index appears to be based can be used to support a wide range of possible values for the exponent on the acceleration, including infinity. This inconsistency results because necessary distinctions have not been made between: the formula for a fitted approximation to the tolerance limit data, the scaling of severity as such, and the measure of the acceleration magnitude of a pulse, the “effective acceleration.” It is recommended that a formula which more literally follows from the tolerance limit data be adopted. In the long run, however, it is believed that a much more appropriate measure of injury severity would result from processing head impact data in such a way as to reflect the probable degree of brain injury.
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Citation
Versace, J., "A Review of the Severity Index," SAE Technical Paper 710881, 1971, https://doi.org/10.4271/710881.Also In
References
- Eiband A. M. “Human Tolerance to Rapidly Applied Accelerations: A Summary of the Literature.” NASA Memo 5-19-59 E
- Gadd C. W. “Use of Weighted-Impulse Criterion for Estimating Injury Hazard.” Proceedings of Tenth Stapp Car Crash Conference 12 660793 New York Society of Automotive Engineers, Inc. 1966
- Patrick L. M. et al. “Survival by Design-Head Protection.” Seventh Stapp Car Crash Conference Proceedings Springfield, Ill. Charles C Thomas 1963
- Stalnaker R. L. McElhaney J. H. Roberts V. L. “MSC Tolerance Curve for Head Impacts.” ASME paper ul-WA/BHF-10 November 1971
- Human Tolerance to Impact Conditions as Related to Motor Vehicle Design SAE Information Report October 1966 SAE Handbook
- Slattenschek A. Tauffkirchen W. “Critical Evaluation of Assessment Methods for Head Impact Applied in Appraisal of Brain Injury Hazard, in Particular Head Impact on Windshields.” 700426 1970 International Automobile Safety Conference Compendium 30 New York Society of Automotive Engineers, Inc. 1970
- Brinn J. Staffeld S. E. “Evaluation of Impact Test Accelerations: A Damage Index for the Head and Torso.” Proceedings of Fourteenth Stapp Car Crash Conference 700902 New York Society of Automotive Engineers, Inc. 1970
- Fan W.R.S. “A Technique For Determining Head Impact Severity Index.” Ford Motor Co. Automotive Safety Affairs Office Report No. S-71-9 February 16 1971
- Fan W.R.S. “Comparison of Several Head Injury Severity Indexes.” Ford Motor Co. Automotive Safety Affairs Office Report No. S-71-28 June 18 1971
- Grush E. S. Henson S. E. Ritterling O. R. “Restraint System Effectiveness.” Ford Motor Co. Automotive Safety Affairs Office Report No. S-71-40 September 21 1971
- Berkson J. “A Statistically Precise and Relatively Simple Method of Estimating the Bio-Assay with Quantal Response, Based on the Logistic Function.” J. Amer. Stat. Assoc. 48 1953 565 599
- System Effectiveness Study