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Modular Loadwall Side Impacts: Implications for Advanced Sensor Deflection Measures in Dummies

Modular Loadwall Side Impacts: Implications for Advanced Sensor Deflection Measures in Dummies. John R. Humm N . Yoganandan Frank A. Pintar Department of Neurosurgery Milwaukee, WI. Recent Field Studies. Pintar et al, 2007-9. CIREN cases NASS analyses

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Modular Loadwall Side Impacts: Implications for Advanced Sensor Deflection Measures in Dummies

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  1. Modular Loadwall Side Impacts: Implications for Advanced Sensor Deflection Measures in Dummies John R. Humm N. Yoganandan Frank A. Pintar Department of Neurosurgery Milwaukee, WI

  2. Recent Field Studies Pintar et al, 2007-9 CIREN cases NASS analyses Oblique loading is more prevalent Injuries are different from pure lateral

  3. Oblique versus Pure Lateral Loading Oblique Pure lateral

  4. Injury Criteria Response Corridors of Human Surrogates in Lateral Impacts. Maltese et. al Stapp 2002 Development of Side Impact Thoracic Injury Criteria and Their Application to the Modified ES-2 Dummy with Rib Extensions. Kuppa et. al. Stapp 2003 Injury Risk Curves for the WorldSID 50th Male Dummy. Peitjean et. al. Stapp 2009 Developed for Pure Lateral Loading

  5. Oblique and Pure Lateral Sled Tests ES-2 re WorldSID Need Modular Scalable Load-Wall Anthropometry differences Region design differences Rib design differences

  6. Modular Scalable Load-Wall Shoulder Thorax Abdomen Pelvis (superior) Leg plate Pelvis (inferior) STAPP load-wall design

  7. WorldSID Alignment

  8. WorldSID Alignment

  9. WorldSID Alignment

  10. WorldSID Alignment

  11. WorldSID Alignment

  12. Loadwalls

  13. Test Protocol and Instrumentation WorldSID 50% dummy Oblique and pure lateral loadings Three repeat tests at 3.35, 6.7, 7.5 m/s Region-specific deflection datasets 2 Chestbands: thorax and abdomen Internal sensors

  14. Overhead Videos Images

  15. Chestband Outputs Effective peak deflections Effective peak angulations “Simulated IR-TRACC-type” peak deflections Thoracic and abdominal regions

  16. Chestband Contours Oblique Pure Lateral

  17. Effective Peak Deflection from Chestbands Define Origin: Pre-impact contour STERNUM L0 0.5 L0 SPINE

  18. Effective Peak Deflection from Chestbands Define Origin: Subsequent contours STERNUM 0.5 L0 SPINE

  19. Effective Peak Deflection from Chestbands Dto Dt1 Dt2 t0 t1 t2 Distance of each point on the contour relative to the origin is computed at each time step Temporal deflection at any point and time, i: Dt0 – Dti

  20. Determination of Peak Deflections

  21. Determination of Peak Deflections Dto Dt1 Dt2 t1 t2 t0

  22. Determination of Peak Deflections Effective Peak Angle Effective Peak Deflection D0 Dt

  23. “Simulated IR-TRACC-type” Deflections Based on chestband data

  24. WorldSID Thorax Deflections Oblique

  25. WorldSID DeflectionsOblique Thorax Abdomen

  26. WorldSID DeflectionsPure Lateral Thorax Abdomen

  27. Thorax Abdomen

  28. Angle of effective peak chest deflections

  29. Deflections from Internal Sensors Peak deflections from IR-TRACC

  30. Internal Sensor Peak Deflections Thorax Abdomen

  31. Multipoint Sensing – Chestband Data Application – RibEye

  32. 2D-IR-TRACC: Angular Measurements

  33. Simulated 2D IR-TRACC angle Based on chestband data

  34. Simulated 2D-IR-TRACC angle

  35. Summary • Region-specific responses • Effective in sensing pure lateral loads • Peak internal sensor deflections oblique<pure lateral • Follows expected contours in oblique impacts • Current 1D IR-TRACC sensor location • Replicates pure lateral response well • Less than optimal for oblique loading • RibEye& 2D IR-TRACC: implications • Injury criteria for oblique loading

  36. Acknowledgments US DOT NHTSA DTNH22-07-H-00173 and VA Medical Research Service Thank you

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