information for the flexible pedestrian legform impactor (flex-pli)
DESCRIPTION
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. Biofidelity Evaluation. TRL-LFI. - PowerPoint PPT PresentationTRANSCRIPT
Information for the Flexible Pedestrian Legform Impactor
(Flex-PLI)
Ministry of Land, Infrastructure and Transport Government of Japan
(J-MLIT)
Informal Document No. GRSP-36-2(36th GRSP, 7-10 December 2004, agenda item A.1.)
Construction
Thigh(RIGID)
Leg (RIGID)
Damper
KneeJoint
(Steel KneeBending Plate)
TRL-LFI Flex-PLI 2003
Thigh(FLEXIBLE)
Leg (FLEXIBLE)
Knee Joint*(ligament restraint
system)
Biofidelity Evaluation
-100
0
100
200
300
400
500
600
0 10 20 30 40 50 60
Deflection (mm)
Mom
ent (
Nm
)
Corridor Lower
Corridor Upper
Corridor Avg.
FlexPLI 2003R Avg.
UVA Mid-Thigh Dynamic Bending Corridor
DDV/DCV Rating0.30 0 to 1 Excellent
1 to 2 Good2 to 3 Moderateover 3 Poor
-50
0
50
100
150
200
250
300
350
400
0 10 20 30 40 50
Deflection (mm)
Mom
ent (
Nm
)
Corridor LowerCorridor UpperCorridor Avg.FlexPLI 2003R Avg.
UVA Mid-Leg Dynamic Bending Corridor
DDV/DCV Rating0.33 0 to 1 Excellent
1 to 2 Good2 to 3 Moderateover 3 Poor
0
20
40
60
80
100
120
140
160
180
200
0 2 4 6 8 10 12 14 16
Angle (deg.)
Mom
ent (
Nm
)
Corridor Lower
Corridor Upper
Corridor Avg.
FlexPLI 2003R Avg.
UVA Knee Dynamic Bending Corridor
RatingDDV/DCV 0 to 1 Excellent
1.27 1 to 2 Good2 to 3 Moderateover 3 Poor
Flex-PLI has higher biofidelic construction than the TRL-LFI
Kinematics
Flex-PLI Human FE-Model (THUMS)
TRL-LFI FE-Model of TRL-LFI
JASIC 2003 Report
Flex-PLI can simulate human lower extremity bending motion properly.
Knee bending only
Over all lower extremity bending motion is observed.
Measurement System
for Knee ligamentsinjury assessment
(Angle, Disp.)
for Leg injuryassessment
(Acc.)
Knee Shearing(displacement)
Knee Bending(angle)
Leg 0(acceleration)
TRL-LFI
Knee Joint
65 mm
Impact
for Leg Injury assessment
(strain)
for Knee ligamentsinjury assessment
(Elongation)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
Flex-PLI has higher injury assessment ability than the TRL-LFI
no measurement(cannot detect injury)
Discussion
Flex-PLI
TRL-LFI
Knee bending only
Over all lower extremity bending motion is observed.
Biofidelity IssueTRL-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.
Measurement System Issue
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.
for Knee ligamentsinjury assessment
(Angle, Disp.)
for Leg injuryassessment
(Acc.)
Knee Shearing(displacement)
Knee Bending(angle)
Leg 0(acceleration)
TRL-LFI
Knee Joint
65 mm
Impact
TRL-LF cannot detect the lower part of the leg severity
no measurement(cannot detect injury)
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.
Conclusions
Thank you for your attention!