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Modular Loadwall Side Impacts: Implications for Advanced Sensor Deflection Measures in DummiesJohn R. HummN. YoganandanFrank A. Pintar

Department of Neurosurgery Milwaukee, WI

#1Recent Field StudiesCIREN casesNASS analysesOblique loading is more prevalentInjuries are different from pure lateralPintar et al, 2007-9

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

Developed for Pure Lateral LoadingOblique and Pure Lateral Sled Tests Anthropometry differencesRegion design differencesRib design differences

ES-2 re WorldSIDNeed Modular Scalable Load-Wall

ShoulderThoraxAbdomenPelvis (superior)Pelvis (inferior)Leg plateModular Scalable Load-Wall STAPP load-wall design6

WorldSID Alignment

7WorldSID Alignment

8WorldSID Alignment

9WorldSID Alignment

10WorldSID Alignment

11Loadwalls12

Test Protocol and InstrumentationWorldSID 50% dummyOblique and pure lateral loadingsThree repeat tests at 3.35, 6.7, 7.5 m/sRegion-specific deflection datasets2 Chestbands: thorax and abdomen Internal sensors

Overhead Videos Images

Chestband OutputsEffective peak deflectionsEffective peak angulationsSimulated IR-TRACC-type peak deflectionsThoracic and abdominal regions

Chestband Contours

ObliquePure Lateral

Effective Peak Deflection from Chestbands

SPINESTERNUML00.5 L0Define Origin: Pre-impact contour

Effective Peak Deflection from ChestbandsDefine Origin: Subsequent contoursSPINESTERNUM0.5 L0Effective Peak Deflection from Chestbands

Distance of each point on the contour relative to the origin is computed at each time stept2t1t0DtoDt1Temporal deflection at any point and time, i: Dt0 DtiDt2

Determination of Peak Deflections

t2t1t0DtoDt1Dt2Determination of Peak Deflections

D0Dt

Effective Peak Deflection Effective Peak AngleDetermination of Peak DeflectionsSimulated IR-TRACC-type Deflections

Based on chestband data

WorldSID Thorax Deflections Oblique

WorldSID DeflectionsObliqueThoraxAbdomen

WorldSID DeflectionsPure LateralThoraxAbdomen

ThoraxAbdomen

Angle of effective peak chest deflections

Deflections from Internal Sensors Peak deflections from IR-TRACC

Internal Sensor Peak DeflectionsThoraxAbdomen

Application RibEye

Multipoint Sensing Chestband Data

2D-IR-TRACC: Angular Measurements

Simulated 2D IR-TRACC angle

Based on chestband data

Simulated 2D-IR-TRACC angle

SummaryRegion-specific responsesEffective in sensing pure lateral loadsPeak internal sensor deflections oblique