Konigsberg Nine AU Update

1. Konigsberg Nine AU Update John Bolte IV, PhD The Ohio State University Injury Biomechanics Research Laboratory Scientific Symposium on Injury Biomechanics Research

2. Konigsberg Bite Plate 9AU System Laptop - NI Labview Parallel Data Converter Battery Amplifier/ Encoder National Instruments – Digital I/O Card 9 AU Bite Plate

3. Bite Plate & Mouth Guard

4. Calibration block X ^ ^ ^ +0.577 i – 0.577 j + 0.577 k q = 54.7o Z Y

5. Test Plan • Static test at four positions • -x, y, z, • 0.577 Gs • Shaker table test at two frequencies • (0.577 Gs) • 25 Hz • 1000 Hz • Rotation table test (future work) • Low angular acceleration • High angular acceleration

6. Static Calibration 5 seconds each position Position #1 -X Position #2 +Y Position #3 +Z Position #4 +0.577 i – 0.577 j + 0.577 k

7. Sampling Rate

8. Skew Interval

9. Static Test Pos #1 Pos #2 Pos #3 Pos #4

10. Static Test – Position #4 0.577

11. Error – Static Test Channel #1 – X 6.8% Channel #2 – Y 9.2% Channel #3 – Z 13.0% Channel #4 – X 5.7% Channel #5 – Y 5.8% Channel #6 – Z 1.1% Channel #7 – X 3.9% Channel #8 – Y 2.2% Channel #9 – Z 10.6% average Gs 0.577 Gs % error =

12. Shaker Table Test

13. Shaker Table Test at 25 Hz0.577 *1.65 Gs = 0.95 Gs

14. Error – Shaker Test @25 Hz Correlation Amplitude Factor* – 0.577 0.577 E = % error = Channel #7 – X A = .581 E = 0.6% Channel #8 – Y A = .558 E = 3.4% Channel #9 – Z A = .637 E = 10.6% * Time series analysis

15. Shaker Table Test at 1000 Hz0.577 *14.4 Gs = 8.3 Gs

16. Trade-offs • Small size vs. Accuracy Sampling rate • Wireless vs. Skew interval • Low cost vs. Durability accelerometers

17. Alternatives? • Threshold data recording • Higher sampling rates • Head data ~ 1,000 Hz • DTS G5 data acquisition • More durable accelerometers

18. Follow-On Work? • Angular acceleration testing • 9 AU angular acceleration calculation check • PMHS head drops • PMHS “boxing punch” • IRB approval for human boxing use • Human use experiment development • Boxing test

19. Thank-You