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Normalization of Head Impact Test Data to 24 km/h
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Abstract
This paper provides a methodology for adjustment of off-speed head impact test data to the required 24.14 km/h for interior head impact. The “Normalization Process” utilizes the Generic Waveform Concept for its basic foundation. Predicted results from FE Head Impact Simulation Model were used to validate the Normalization Process. It is recommended that Normalization should be applied to cases where impact velocities are within ±0.8 km/h speed difference. In general, Normalizing down-speed (from 24.94 to 24.14 km/h) is preferred over Normalizing up-speed (23.33 to 24.14 km/h). One must always check for potentially severe “bottom-out” condition by examining the pulse shape for any abrupt peaks in headform deceleration. The Normalization Process should not be applied to “glancing” impacts in which the impact and rebound vectors are not colinear.
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Lim, G., Chou, C., Wu, F., and Zhao, Y., "Normalization of Head Impact Test Data to 24 km/h," SAE Technical Paper 970389, 1997, https://doi.org/10.4271/970389.Also In
Occupant Protection and Injury Assessment in the Automotive Crash Environment
Number: SP-1231; Published: 1997-02-24
Number: SP-1231; Published: 1997-02-24
References
- Lim G.G. Chou C.C. Patel R.N. Shahab S.A. Patel P.J. “Estimating the Minimum Space to Meet Federal Interior Head Impact Requirement” SAE Paper No. 950333 Detroit, MI February 28 1995
- Chou C.C. Nyquist G.W. “Analytical Studies of the Head Injury Criterion (HIC)” SAE Paper No. 740082 Detroit, MI February 25 March 1 1974
- Chou C.C. Lim G.G. “Vehicle Deceleration Pulse Characterization by Harmonic Analysis” XXth FISITA Congress Belgrade, Yugoslavia June 2-6 1986
- Chou C.C. Zhao Y. Chai L. Co J. Lim G.G. Lin T.L. “Development of Foam Models using LS-DYNA3D” The 2nd International LS-DYNA3D Users' Conference San Francisco, CA September 20 - 21 1994
- Chou C.C. Zhao Y. Chai L. Co J. Lim G.G. Lin T.C. “Development of Foam Models as Applications to Vehicle Interior” The 39th Stapp Car Crash Conference San Diego, CA SAE paper No. 952733 November 8-10 1995
- Chou C.C. Huang Y. Zhao Y. Lim G.G. “Development and Validation of a Featureless Headform Model Using LS-DYNA3D” The Third International LS-DYNA3D Users' Conference Kyoto, Japan November 28-29 1995 Paper No. 7