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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 Slide 2 Recent Field Studies CIREN cases NASS analyses Oblique loading is more prevalent Injuries are different from pure lateral Pintar et al, 2007-9 Slide 3 Pure lateral Oblique Oblique versus Pure Lateral Loading Slide 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 50 th Male Dummy. Peitjean et. al. Stapp 2009 Developed for Pure Lateral Loading Slide 5 Oblique and Pure Lateral Sled Tests Anthropometry differences Region design differences Rib design differences ES-2 re WorldSID Need Modular Scalable Load-Wall Slide 6 Shoulder Thorax Abdomen Pelvis (superior) Pelvis (inferior) Leg plate Modular Scalable Load-Wall STAPP load-wall design Slide 7 WorldSID Alignment Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Loadwalls 12 Slide 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 Slide 14 Overhead Videos Images Slide 15 Chestband Outputs Effective peak deflections Effective peak angulations Simulated IR-TRACC-type peak deflections Thoracic and abdominal regions Slide 16 Chestband Contours ObliquePure Lateral Slide 17 Effective Peak Deflection from Chestbands SPINE STERNUM L0L0 0.5 L 0 Define Origin: Pre-impact contour Slide 18 Effective Peak Deflection from Chestbands Define Origin: Subsequent contours SPINE STERNUM 0.5 L 0 Slide 19 Effective Peak Deflection from Chestbands Distance of each point on the contour relative to the origin is computed at each time step t2t2 t1t1 t0t0 D to D t1 Temporal deflection at any point and time, i: D t0 D ti D t2 Slide 20 Determination of Peak Deflections Slide 21 t2t2 t1t1 t0t0 D to D t1 D t2 Determination of Peak Deflections Slide 22 D0D0 DtDt Effective Peak Deflection Effective Peak Angle Determination of Peak Deflections Slide 23 Simulated IR-TRACC-type Deflections Based on chestband data Slide 24 WorldSID Thorax Deflections Oblique Slide 25 WorldSID Deflections Oblique Thorax Abdomen Slide 26 WorldSID Deflections Pure Lateral Thorax Abdomen Slide 27 Thorax Abdomen Slide 28 Angle of effective peak chest deflections Slide 29 Deflections from Internal Sensors Peak deflections from IR-TRACC Slide 30 Internal Sensor Peak Deflections Thorax Abdomen Slide 31 Application RibEye Multipoint Sensing Chestband Data Slide 32 2D-IR-TRACC: Angular Measurements Slide 33 Simulated 2D IR-TRACC angle Based on chestband data Slide 34 Simulated 2D-IR-TRACC angle Slide 35 Summary Region-specific responses Effective in sensing pure lateral loads Peak internal sensor deflections oblique