Relating Head Measurements to Fit and Comfort of Helmets

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Relating Head Measurements to Fit and Comfort of Helmets

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1. ISSC Conference December 15, 2004 Relating Head Measurements to Fit and Comfort of Helmets Chuck Rogers, David Rogers, Duco Noordzij Artisent, Inc. Boston, MA, U.S.A.

2. ISSC Conference December 15, 2004 U.S. Army Project: Future Force Warrior (FFW)

3. ISSC Conference December 15, 2004 New Capabilities Head-mounted-display Multi-spectral sensors for enhanced vision Communications support Eye and ear protection

4. ISSC Conference December 15, 2004 Tough Constraints Similar or better ballistic protection Improved impact protection More stable retention system as platform for the sensors and displays Strict weight restrictions Accommodating wide range of head sizes and shapes

5. ISSC Conference December 15, 2004 Popular Adult Sizing Schemes

6. ISSC Conference December 15, 2004 ANSUR 88 Male Working Data (N = 1774) Circumference 51.4 – 62.7 cm Width 128 – 173 mm Length 173 – 220 mm Initial request: 5-95% Two sizes 55-58; 59-62 Three sizes 54-57; 57-60; 60-63

7. ISSC Conference December 15, 2004 Two vs Three Sizes

8. ISSC Conference December 15, 2004 Fit Models of 2 vs 3 Sizes

9. ISSC Conference December 15, 2004 User Jury Feedback (N=13)

10. ISSC Conference December 15, 2004 Decision Three sizes cover 5-99+ percentile males Avoid need for extra-large Addition of extra small will cover females with total of 4 helmets

11. ISSC Conference December 15, 2004 Preferred Lacrosse Helmet (N=80)

12. ISSC Conference December 15, 2004 Sizing by Circumference Measured Circumference predicted preferred helmet size correctly only 67.5% of the time. Why?

13. ISSC Conference December 15, 2004 Typical view of Head Sizing

14. ISSC Conference December 15, 2004 Medium Circum. 56.6 – 59.5 cm

15. ISSC Conference December 15, 2004 ANSUR 88 Male Working Data N = 1774 Correlations: Width vs. Length 0.12 Width vs. Circum. 0.54 Length vs. Circum. 0.82 Circum vs Length+Width 0.93

16. ISSC Conference December 15, 2004 Ft Benning study (N = 74)

17. ISSC Conference December 15, 2004

18. ISSC Conference December 15, 2004

19. ISSC Conference December 15, 2004 by Length and Width measurements

20. ISSC Conference December 15, 2004 Preferred Delta (Length)

21. ISSC Conference December 15, 2004 Preferred Delta (Width)

22. ISSC Conference December 15, 2004 Assumptions about Shape

23. ISSC Conference December 15, 2004 Shape Discrepancy (N=74)

24. ISSC Conference December 15, 2004 Predicting Helmet Size

25. ISSC Conference December 15, 2004 Small Helmet Preferred

26. ISSC Conference December 15, 2004 Medium Helmet Preferred

27. ISSC Conference December 15, 2004 Large Helmet Preferred

28. ISSC Conference December 15, 2004 Shape Discrepancy

29. ISSC Conference December 15, 2004 Shape Discrepancy

30. ISSC Conference December 15, 2004 Actual = Predicted Distribution

31. ISSC Conference December 15, 2004 Three sizes for ANSUR 88 data

32. ISSC Conference December 15, 2004 Distribution of ANSUR 88 Population

33. ISSC Conference December 15, 2004 Spread sizes by 4.0 cm

34. ISSC Conference December 15, 2004 Percentage Wearing Each Size

35. ISSC Conference December 15, 2004 Preferred Delta (Length)

36. ISSC Conference December 15, 2004 Estimation of Good / Poor Fit

37. ISSC Conference December 15, 2004 Sum Sq Fit Errors

38. ISSC Conference December 15, 2004 Fit Scores all helmets

39. ISSC Conference December 15, 2004 Summary Circumference is not a good indicator of helmet size Shape discrepancy calculation improves predictions The extent of accommodation of head shapes is dependent on helmet shape, retention system, and liner materials All of these must be considered when determining helmet sizing scheme

40. ISSC Conference December 15, 2004 Acknowledgements Technology Program Office (TPO): Natick Soldier Center

41. ISSC Conference December 15, 2004 Acknowledgements Natick Soldier Center, Dave Krasnecky co-lead Kaiser Electro-Optics, Jim Melzer co-lead Artisent, Inc. DRS Optronics MSA, Mine Safety Appliances

42. ISSC Conference December 15, 2004 Presenter Contact Information

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