Information for the Flexible Pedestrian Legform Impactor (Flex-PLI)

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Presentation transcript:

Information for the Flexible Pedestrian Legform Impactor (Flex-PLI) Informal Document No. GRSP-36-2 (36th GRSP, 7-10 December 2004, agenda item A.1.) Information for the Flexible Pedestrian Legform Impactor (Flex-PLI) Ministry of Land, Infrastructure and Transport Government of Japan (J-MLIT)

Construction TRL-LFI Flex-PLI 2003 Biofidelity Evaluation TRL-LFI Flex-PLI 2003 Thigh (RIGID) Thigh (FLEXIBLE) Damper Knee Joint (Steel Knee Bending Plate) Knee Joint* (ligament restraint system) Leg (RIGID) Leg (FLEXIBLE) Flex-PLI has higher biofidelic construction than the TRL-LFI

Over all lower extremity bending motion is observed. Kinematics Flex-PLI can simulate human lower extremity bending motion properly. FE-Model of TRL-LFI TRL-LFI Knee bending only Flex-PLI Human FE-Model (THUMS) JASIC 2003 Report Over all lower extremity bending motion is observed.

Measurement System TRL-LFI Flex-PLI 2003 for Knee ligaments injury assessment (Angle, Disp.) for Leg injury assessment (Acc.) Knee Shearing (displacement) Knee Bending (angle) Leg 0 (acceleration) TRL-LFI Knee Joint 65 mm Impact PCL (elongation) MCL (elongation) ACL (elongation) LCL (elongation) Flex-PLI 2003 Leg 1 (strain) Leg 2 (strain) Leg 3(strain) Leg 4(strain) Leg 5 (strain) Thigh 1 (strain) Thigh 2 (strain) Thigh 3 (strain) Thigh 4 (strain) Knee Joint 92 mm 172 mm 252 mm 332 mm 93 mm 173 mm 253 mm 333 mm 413 mm Lateral and Medial Condyle (force) Impact for Knee ligaments injury assessment (Elongation) for Leg Injury assessment (strain) no measurement (cannot detect injury) Flex-PLI has higher injury assessment ability than the TRL-LFI

Discussion

Over all lower extremity bending motion is observed. Biofidelity Issue TRL-LFI has a high possibility to mislead the protection way for the pedestrian lower extremity, since it cannot simulate the human lower extremity motion properly. TRL-LFI Knee bending only Flex-PLI Over all lower extremity bending motion is observed.

Measurement System Issue for Knee ligaments injury assessment (Angle, Disp.) for Leg injury assessment (Acc.) Knee Shearing (displacement) Knee Bending (angle) Leg 0 (acceleration) TRL-LFI Knee Joint 65 mm Impact TRL-LFI has a high possibility to mislead the protection way for the pedestrian lower extremity, since it doesn’t have a measurement system for the injury assessment of the lower part of the leg. no measurement (cannot detect injury) TRL-LF cannot detect the lower part of the leg severity

Conclusions

Conclusions Flex-PLI has high biofidelity higher injury assessment ability than the TRL-LFI J-MLIT recommends to utilize the Flex-PLI as a tool for GTR/PS legform test. However, because of the lack of experience in using the Flex-PLI as a certification tool, a further confirmation process is needed.

Thank you for your attention!