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NHTSA Evaluation of the Flex- GTR Legform on US Vehicles

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Presentation on theme: "NHTSA Evaluation of the Flex- GTR Legform on US Vehicles"— Presentation transcript:

1 NHTSA Evaluation of the Flex- GTR Legform on US Vehicles
Brian Suntay & Ann Mallory Transportation Research Center Inc. Jason Stammen NHTSA Vehicle Research and Test Center This is a work of the U.S. Government and is not subject to copyright in the United States; it may be used or reprinted without permission.

2 Pedestrian Leg Testing
The Pedestrian Global Technical Regulation (GTR No. 9) includes a projectile leg simulating a moving vehicle hitting a stationary pedestrian at 40 km/h

3 Goals of the Testing Comparison of vehicle performance with TRL versus Flex-GTR legforms Confirm whether the Flex-GTR legform is sensitive enough to distinguish marginally performing vehicles from poor performing vehicles Test the Flex-GTR’s durability against aggressive locations on US vehicle bumpers

4 Pedestrian Legforms TRL Flex-GTR

5 TRL Rigid Legform Impactor Steel femur and tibia segments
Frangible steel ligaments Instrumentation: Tibia accelerometer Rotary pot with rigid arm

6 Flex-GTR Flexible Legform Impactor
Increased biofidelity Flexible bone core, wire ligaments, knee tension cables Instrumentation: Tibia and Femur strain gauges Ligament string potentiometers (MCL, ACL, PCL, ACL)

7 Injury Assessment TRL Flex-GTR Bending Injury Measures
Knee Bending Angle MCL Elongation Shear Injury Measures Knee Shear Displacement ACL/PCL Elongation Tibia Fracture Measures Tibia Acceleration Tibia Bending Moment TRL Flex-GTR

8 Volkswagen Passat Mazda Miata Honda Civic

9 Honda Pilot Chevrolet Silverado Chevrolet Equinox

10 Test Results

11 TRL Test Results

12 Flex-GTR Test Results

13 Comparison of Results TRL vs Flex-GTR

14 Comparison of Results – TRL vs Flex-GTR

15 Comparison of Results – TRL vs Flex-GTR

16 Summary of Findings The Flex-GTR measures lower values than the TRL legform with respect to their current injury limits In contrast: Matsui et al., Characteristics of the TRL Pedestrian Legform and the Flexible Pedestrian Legform Impactors in Car-front Impact Tests, Paper Number , 21st International Technical Conference on the Enhanced Safety of Vehicles, 2009. Yoon et al., Evaluation of Usefulness and Repeatability for Pedestrian Protection Flex-PLI, Paper Number , 22nd International Technical Conference on the Enhanced Safety of Vehicles, 2011. Aggressive vehicle bumper impact locations chosen

17 Flex-GTR Vehicle Sensitivity

18 Sensitivity Fracture Bend Shear
Testing with a previous version of the Flex-GTR legform suggested an inability of the legform to distinguish among vehicles that performed poorly (Mallory, 2010) Results from current series of tests Three additional tests performed on the center of the three passenger cars Fracture Bend Shear

19 Volkswagen Passat Mazda Miata Honda Civic

20 Comparison of Old and New Flex-GTR Data – Center Impacts

21 Summary of Findings The Flex-GTR measures lower values than the TRL legform with respect to their current injury limits The Flex-GTR seems to be able to distinguish differences in relatively aggressive vehicle bumper designs

22 Flex-GTR Durability

23 Observations and Durability Assessment (Flex-GTR)
Misalignment of the knee after impacts Femur strain gauge #2 (middle gauge) Broken gauge/wire Still being investigated Tear in the neoprene skin and scratches on the femur knee block

24 Summary of Findings The Flex-GTR measures lower values than the TRL legform with respect to their current injury limits The Flex-GTR seems to be able to distinguish differences in relatively aggressive vehicle bumper designs The Flex-GTR was observed to be durable Survived US vehicle bumper impacts that exceeded injury limits A majority of the issues that were observed were minor and repairable

25 Flex-GTR Repeatability
(Additional Observation)

26 Flex-GTR Repeatability
Injury Measurement Injury Reference Value (FlexTEG) Chevrolet Silverado Impact Location Center GTR (1001) GTR (1002) %Difference Femur Moment (Nm) Femur 3 (Upper) --* 73.7 77.3 5% Femur 2 (Middle) 139.5 138.5 1% Femur 1 (Lower) 252.1 245.6 3% Tibia Moment (Nm) Tibia 1 (Upper) 340 Nm (380 Nm) 332.7 332.6 0% Tibia 2 (Mid Upper) 311.1 319.5 Tibia 3 (Mid Lower) 233.5 237.4 2% Tibia 4 (Lower) 110.5 107.9 MCL Elongation (mm) 22 mm -- 22.3 NA ACL Elongation (mm) 13 mm 8 7.9 PCL Elongation (mm) 5.4 5.6 4% LCL Elongation (mm) -4.2 -3.8 10% Tibia Acceleration (g) -59.2 -59.5 Velocity (m/s) 11.1 Average:

27 Summary of Findings The Flex-GTR measures lower values than the TRL legform with respect to their current injury limits The Flex-GTR seems to be able to distinguish differences in relatively aggressive vehicle bumper designs The Flex-GTR was observed to be durable Survived US vehicle bumper impacts that exceeded injury limits A majority of the issues that were observed were minor and repairable Flex-GTR repeatability was not directly evaluated, but Silverado Flex-GTR tests 1001 and 1002 showed similar values at the same impact location, which is promising

28 NHTSA Evaluation of the Flex-GTR Legform on US Vehicles
Brian Suntay & Ann Mallory Transportation Research Center Inc. Jason Stammen NHTSA Vehicle Research and Test Center This is a work of the U.S. Government and is not subject to copyright in the United States; it may be used or reprinted without permission.

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