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BioRID II Preliminary
Repeatability Assessment &
Biofidelity Assessment
BioRID II Preliminary
Repeatability Assessment &
Biofidelity Assessment
Kevin Moorhouse, Ph.D.Bruce Donnelly, Ph.D.
NHTSA
Kevin Moorhouse, Ph.D.Bruce Donnelly, Ph.D.
NHTSA
GTR 7 Informal Working Group21-22 September 2010
Berlin, Germany
Repeatability ObjectiveRepeatability Objective
• Assess in a realistic repeatable mode• “Yielding” seatback, 30o rotation• Two exposures
• Low speed – 16.7 kph, 8.5 Gs• Mid speed – 24 kph, 10.5 Gs
• Three dummies• BioRID II• HIII• RID 3D
• Assess in a realistic repeatable mode• “Yielding” seatback, 30o rotation• Two exposures
• Low speed – 16.7 kph, 8.5 Gs• Mid speed – 24 kph, 10.5 Gs
• Three dummies• BioRID II• HIII• RID 3D
Biofidelity ObjectiveBiofidelity Objective
• Assess biofidelity • Two exposures: low & mid• Six PMHS at each speed• Low then Mid-speed• Internal biofidelity• External biofidelity
• Analyze vertebral kinematics• 6 DOF per vertebra
• Assess biofidelity • Two exposures: low & mid• Six PMHS at each speed• Low then Mid-speed• Internal biofidelity• External biofidelity
• Analyze vertebral kinematics• 6 DOF per vertebra
0 50 100 150 200 250 300Time [msec]
-2.5
0
2.5
5
7.5
10
12.5
Acc
eler
a tio
n[g]
Injury Criteria ObjectiveInjury Criteria ObjectiveAx
Ay Az
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C2
C3
C5
C4
C6
C7
T1
Ax
AyAz
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Ax
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C2
C3
C5
C4
C6
C7
T1
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• Identify injurious kinematics• Compare with values of non-injurious physiologic ROM
(Panjabi et al, 1998; Panjabi et al, 2005)
• Flexion and extension rotations• Shear and axial displacements
• Determine likelihood and mode of injury at each vertebral level
• Compare to various injury criteria and look for best predictor• IV-NIC• NIC, Nij , Nkm , Nte , ND criterion, LNL index• Head-to-Torso rotation, upper & lower extension moment• Other??
• Identify injurious kinematics• Compare with values of non-injurious physiologic ROM
(Panjabi et al, 1998; Panjabi et al, 2005)
• Flexion and extension rotations• Shear and axial displacements
• Determine likelihood and mode of injury at each vertebral level
• Compare to various injury criteria and look for best predictor• IV-NIC• NIC, Nij , Nkm , Nte , ND criterion, LNL index• Head-to-Torso rotation, upper & lower extension moment• Other??
Pulses: Low & Mid-speedPulses: Low & Mid-speed
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-2.5
0
2.5
5
7.5
10
12.5
Acc
eler
a tio
n[g ]
Low (16.7kph/8.5g)-ATDLow (16.7kph/8.5g)-PMHSModerate (24kph/10.5g)-ATDModerate (24kph/10.5g) - PMHS
Rear Impact Sled SeatRear Impact Sled Seat
Seat instrumentation
HR LCs
SB LCs
SP LCs
Mass : 5.5 kgDiameter :17 mm
Head restraint-Mass: 30 kg
-Padding/cushions/seat cover of 1999 Toyota Camry seat
Seat
One-way damper (×2)
SpringStiffness: 13500 N/m (×2)
Angular rate sensor
Damper
Repeatability Test MatrixRepeatability Test Matrix
Test Number
Test Speed
Driver Side Dummy
Passenger SideDummy
1 L Hybrid III 50th BioRID II
2 L Hybrid III 50th BioRID II
3 L RID3D BioRID II
4 L RID3D BioRID II
5 L RID3D Hybrid III 50th
6 M RID3D Hybrid III 50th
7 M RID3D Hybrid III 50th
8 M RID3D BioRID II
9 M RID3D BioRID II
10 M Hybrid III 50th BioRID II
L = Low Speed (8.5 g, 16.7 kph FMVSS 202)
M = Moderate Speed (10.5 g, 24 kph)
Repeatability MethodologyRepeatability Methodology
• Peak analysis (Rhule 2005)
• Coefficient of variation• Time based analysis
• Upper 80% only• Repeatability (J.Shaw 2006)
• Cumulative C.V.• Confidence interval
• Reproducibility (J. Shaw 2006)
• Repeatability established• Hypothesis testing• t-statistic at 10% cum. C.V.
• Peak analysis (Rhule 2005)
• Coefficient of variation• Time based analysis
• Upper 80% only• Repeatability (J.Shaw 2006)
• Cumulative C.V.• Confidence interval
• Reproducibility (J. Shaw 2006)
• Repeatability established• Hypothesis testing• t-statistic at 10% cum. C.V.
R&R rating C.V. %
Excellent 0 to 5Good >5 to 8
Acceptable >8 to 10Poor >10
0 200 400 600 800 1000 1200 1400 1600-2000
0
2000
4000
6000
8000
10000
EEVC Biofidelity Test CriteriaEEVC Biofidelity Test Criteria
• Availability of data• Quality of set-up, instrumentation, subject quality• Reproducibility• Relevance of test conditions, loading conditions, ΔV• Distribution of subject anthropometry, gender, age• Number of tests and subjects
• Availability of data• Quality of set-up, instrumentation, subject quality• Reproducibility• Relevance of test conditions, loading conditions, ΔV• Distribution of subject anthropometry, gender, age• Number of tests and subjects
Reference: Hynd, D., et. al., EEVC WG12 Report – Document Number 505A, Dummy Requirements and Injury Criteria for a Low-speed Rear Impact Whiplash Dummy, September 2007.
Biofidelity AnalysisBiofidelity Analysis
• Qualitative analysis• Overplots• “Eyeball” assessment
• Quantitative analysis• BioRank?• Objective Rating Method?• CORA?• Phase, Magnitude, Shape?
• Qualitative analysis• Overplots• “Eyeball” assessment
• Quantitative analysis• BioRank?• Objective Rating Method?• CORA?• Phase, Magnitude, Shape?
Biofidelity Test MatrixBiofidelity Test Matrix
* Tested 10-9-2010
Internal Biofidelity ParametersInternal Biofidelity Parameters
• T1 angle w/r to sled• T1 X-acceleration w/r sled• Head angular displacement w/r to sled• Head CG X-displacement w/r to sled• Head angular displacement w/r to T1• HIC15
• T1 angle w/r to sled• T1 X-acceleration w/r sled• Head angular displacement w/r to sled• Head CG X-displacement w/r to sled• Head angular displacement w/r to T1• HIC15
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-10
0
10
20
30
40
50
Rot
atio
n [d
eg]
HybridIIIRID3DBioRIDII
T1 angle w/r to sled-17 kphT1 angle w/r to sled-17 kph
Repeatability (Peak CV):Hybrid III: 4.5%RID3D: 5.5% BioRID: 1.2%
Repeatability (Peak CV):Hybrid III: 4.5%RID3D: 5.5% BioRID: 1.2%
T1 angle w/r to sled-17 kphT1 angle w/r to sled-17 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-10
0
10
20
30
40
50
Rot
atio
n [d
eg]
HybridIIIRID3DBioRIDIIPMHS
T1 X-acceleration w/r sled 17 kph
T1 X-acceleration w/r sled 17 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-10
-5
0
5
10
15
20
25
30
Acc
eler
a tio
n [g
]
HybridIIIRID3DBioRIDII
Repeatability (Peak CV):Hybrid III: 3.8%RID3D: 5.1%BioRID: 7.5%
Repeatability (Peak CV):Hybrid III: 3.8%RID3D: 5.1%BioRID: 7.5%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-10
-5
0
5
10
15
20
25
30
Acc
eler
atio
n [g
]
HybridIIIRID3DBioRIDIIPMHS
T1 X-acceleration w/r sled 17 kph
T1 X-acceleration w/r sled 17 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-20
-10
0
10
20
30
40
50
60
Rot
atio
n [d
e g]
HybridIIIRID3DBioRIDII
Head angular displacement w/r to sled – low speed
Head angular displacement w/r to sled – low speed
Repeatability (Peak CV): Hybrid III: 4.1%RID3D: 5.2%BioRID: 4.8%
Repeatability (Peak CV): Hybrid III: 4.1%RID3D: 5.2%BioRID: 4.8%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-20
-10
0
10
20
30
40
50
60
Rot
atio
n [d
e g]
HybridIIIRID3DBioRIDIIPMHS
Head angular displacement w/r to sled – 17 kph
Head angular displacement w/r to sled – 17 kph
Head CG X displacement w/r to sled – 17 kph
Head CG X displacement w/r to sled – 17 kph
-20 0 20 40 60 80 100 120 140 160 180 200Time [msec]
-600
-500
-400
-300
-200
-100
0
100
Dis
plac
eme n
t [m
m]
HybridIIIRID3DBioRIDII
Repeatability (Peak CV):Hybrid III: 2.2%RID3D: 2.1%BioRID: 2.3%
Repeatability (Peak CV):Hybrid III: 2.2%RID3D: 2.1%BioRID: 2.3%
Head CG X displacement w/r to sled – 17 kph
Head CG X displacement w/r to sled – 17 kph
-20 0 20 40 60 80 100 120 140 160 180 200Time [msec]
-600
-500
-400
-300
-200
-100
0
100
Dis
plac
eme n
t [m
m]
HybridIIIRID3DBioRIDIIPMHS
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-25
0
25
50
75
100
Rot
atio
n [ d
eg]
HybridIIIRID3DBioRIDII
Head angular displacement w/r to T1 – 17 kph
Head angular displacement w/r to T1 – 17 kph
Repeatability (Peak CV): Hybrid III: 5.4%RID3D: 1.2%BioRID: 11.7%
Repeatability (Peak CV): Hybrid III: 5.4%RID3D: 1.2%BioRID: 11.7%
Head angular displacement w/r to T1 – 17 kph
Head angular displacement w/r to T1 – 17 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-25
0
25
50
75
100
Rot
atio
n [ d
eg]
HybridIIIRID3DBioRIDIIPMHS
HIC – 17 kphHIC – 17 kphTable 1 HIC15 – Hybrid III
HIC15 Begin [ms] End [ms]Test#1 176.5 117.1 120.1Test #2 183.3 119.7 122.6Test #3 163.3 121.9 125.0
Table 2 HIC15 – RID3DHIC15 Begin [ms] End [ms]
Test #1 175.6 130.1 132.8Test #2 137.8 131.8 135.3Test #3 281.7 134.8 137.4
Table 3 HIC15 – BioRIDIIHIC15 Begin [ms] End [ms]
Test #1 136.3 123.3 126.9Test #2 164.6 126.8 129.9Test #3 177.8 128.4 131.3
Table 4 HIC15 – PMHSHIC15 Begin [ms] End [ms]
Test #1 58.1 129.8 159.6Test #2 37.4 126.2 162.2Test #3 36.1 128.6 164.6
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-20
0
20
40
60
80
Rot
atio
n [ d
eg]
HybridIIIRID3DBioRIDII
T1 angle w/r to sled-24 kphT1 angle w/r to sled-24 kph
Repeatability (Peak CV):Hybrid III: 3.7% RID3D: 3.0%BioRID: 1.2%
Repeatability (Peak CV):Hybrid III: 3.7% RID3D: 3.0%BioRID: 1.2%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-20
0
20
40
60
80
Rot
atio
n [ d
eg]
HybridIIIRID3DBioRIDIIPMHS
T1 angle w/r to sled-24 kphT1 angle w/r to sled-24 kph
T1 X-acceleration w/r sled 24 kph
T1 X-acceleration w/r sled 24 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-60
-40
-20
0
20
40
60
80
100
Acc
eler
atio
n [g
]
HybridIIIRID3DBioRIDIIRepeatability (Peak CV):
Hybrid III: 5.6%RID3D: 13.9%BioRID: 17.4%
Repeatability (Peak CV): Hybrid III: 5.6%RID3D: 13.9%BioRID: 17.4%
T1 X-acceleration w/r sled 24 kph
T1 X-acceleration w/r sled 24 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-60
-40
-20
0
20
40
60
80
100
Acc
eler
atio
n [g
]
HybridIIIRID3DBioRIDIIPMHS
Head angular displacement w/r to sled – 24 kph
Head angular displacement w/r to sled – 24 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-25
0
25
50
75
100
Rot
atio
n [d
e g]
HybridIIIRID3DBioRIDII
Repeatability (Peak CV): Hybrid III: 8.2RID3D: 7.5%BioRID: 3.8%
Repeatability (Peak CV): Hybrid III: 8.2RID3D: 7.5%BioRID: 3.8%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-25
0
25
50
75
100
Rot
atio
n [d
e g]
HybridIIIRID3DBioRIDIIPMHS
Head angular displacement w/r to sled – 24 kph
Head angular displacement w/r to sled – 24 kph
-20 0 20 40 60 80 100 120 140 160 180 200Time [msec]
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
100
Dis
plac
eme n
t [m
m]
HybridIIIRID3DBioRIDII
Head CG X displacement w/r to sled – 24 kph
Head CG X displacement w/r to sled – 24 kph
Repeatability (Peak CV): Hybrid III: 2.3%RID3D: 0.7%BioRID: 0.8%
Repeatability (Peak CV): Hybrid III: 2.3%RID3D: 0.7%BioRID: 0.8%
-20 0 20 40 60 80 100 120 140 160 180 200Time [msec]
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
100
Dis
plac
emen
t [m
m]
HybridIIIRID3DBioRIDIIPMHS
Head CG X displacement w/r to sled – 24 kph
Head CG X displacement w/r to sled – 24 kph
Head angular displacement w/r to T1 – 24 kph
Head angular displacement w/r to T1 – 24 kph
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-100
-75
-50
-25
0
25
Rot
atio
n [d
eg]
HybridIIIRID3DBioRIDII
Repeatability (Peak CV)Hybrid III: 12.2%RID3D: 25.1%BioRID: 5.9%
Repeatability (Peak CV)Hybrid III: 12.2%RID3D: 25.1%BioRID: 5.9%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-100
-75
-50
-25
0
25
Rot
atio
n [d
eg]
HybridIIIRID3DBioRIDIIPMHS
Head angular displacement w/r to T1 – 24 kph
Head angular displacement w/r to T1 – 24 kph
HIC – 24 kphHIC – 24 kphTable 5 HIC15 – Hybrid III
HIC15 Begin [ms] End [ms]Test #1 239.2 115.5 118.0Test #2 385.1 118.9 121.2Test #3 370.8 121.1 123.5
Table 6 HIC15 – RID3D HIC15 Begin [ms] End [ms]
Test #1 470.3 133.7 136.3Test #2 467.4 132.8 135.5Test #3 613.3 134.2 136.6Test#4 346.5 129.4 132.3
Table 7 HIC15 – BioRIDII HIC15 Begin [ms] End [ms]
Test #1 193.9 126.8 129.5Test #2 183.7 126.6 129.4Test #3 139.3 126.2 129.4
Table 8 HIC15– PMHSHIC15 Begin [ms] End [ms]
Test #1 77.0 141.4 154.6Test #2 95.4 145.3 181.3Test #3 90.7 148.2 184.2
External Biofidelity External Biofidelity
• Seat back loads • Sum• Top• Middle• Lower
• Head restraint loads• Front• Top
• Seat back loads • Sum• Top• Middle• Lower
• Head restraint loads• Front• Top
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-7000
-6000
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [ N
]
HybridIII
RID3D
BioRIDII
Repeatability (Peak CV): Hybrid III: 0.6%RID3D: 3.5%BioRID: 5.8%
Repeatability (Peak CV): Hybrid III: 0.6%RID3D: 3.5%BioRID: 5.8%
17 kph - Seatback Load17 kph - Seatback LoadSum
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-7000
-6000
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [ N
]
HybridIIIRID3DBioRIDIIPMHS
17 kph - Seatback Load17 kph - Seatback LoadSum
17 kph - Seatback Load17 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [ N
]
HybridIIIRID3DBioRIDIIPMHS
Top Level
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [N
]
HybridIIIRID3DBioRIDIIPMHS
Middle Level
17 kph - Seatback Load17 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [ N
]
HybridIIIRID3DBioRIDIIPMHS
Bottom Level
17 kph - Seatback Load17 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-3500
-3000
-2500
-2000
-1500
-1000
-500
0
500Fo
rce
[N]
HybridIII
RID3D
BioRIDII
17 kph – Head Restraint Load17 kph – Head Restraint Load
Front
Repeatability (Peak CV):Hybrid III: 1.4%RID3D: 15.0%BioRID: 4.4%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-3500
-3000
-2500
-2000
-1500
-1000
-500
0
500Fo
rce
[N]
HybridIIIRID3DBioRIDIIPMHS
Front
17 kph – Head Restraint Load17 kph – Head Restraint Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-125
-100
-75
-50
-25
0
25
50
75Fo
rce
[N]
HybridIIIRID3DBioRIDIIPMHS
17 kph – Head Restraint Load17 kph – Head Restraint Load
Top
Repeatability (Peak CV): Hybrid III: 0.6%RID3D: 3.5%BioRID: 5.8%
Repeatability (Peak CV): Hybrid III: 0.6%RID3D: 3.5%BioRID: 5.8%
24 kph - Seatback Load24 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-10000
-8000
-6000
-4000
-2000
0
2000
Forc
e [ N
]
HybridIII
RID3D
BioRIDII
Sum
Repeatability (Peak CV):Hybrid III: 2.1%RID3D: 4.9%BioRID: 6.5%
Repeatability (Peak CV):Hybrid III: 2.1%RID3D: 4.9%BioRID: 6.5%
24 kph- Seatback Load24 kph- Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-10000
-8000
-6000
-4000
-2000
0
2000
Forc
e [N
]
HybridIIIRID3DBioRIDIIPMHS
Sum
24 kph - Seatback Load24 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-6000
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [ N
]
HybridIIIRID3DBioRIDIIPMHS
Top Level
24 kph - Seatback Load24 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-6000
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [N
]
HybridIIIRID3DBioRIDIIPMHS
Middle Level
24 kph - Seatback Load24 kph - Seatback Load
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-6000
-5000
-4000
-3000
-2000
-1000
0
1000
Forc
e [N
]
HybridIIIRID3DBioRIDIIPMHS
Bottom Level
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-4000
-3000
-2000
-1000
0
1000
Forc
e [N
]
HybridIII
RID3D
BioRIDII
24 kph – Head Restraint Load24 kph – Head Restraint Load
Front
Repeatability (Peak CV):Hybrid III: 11.2%RID3D: 16.2%BioRID: 4.4%
Repeatability (Peak CV):Hybrid III: 11.2%RID3D: 16.2%BioRID: 4.4%
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-4000
-3000
-2000
-1000
0
1000
Forc
e [N
]
HybridIIIRID3DBioRIDIIPMHS
24 kph – Head Restraint Load24 kph – Head Restraint Load
Front
-20 0 20 40 60 80 100 120 140 160 180 200 220 240 260Time [msec]
-250
0
250
500
750
1000
1250
1500
Forc
e [N
]
HybridIIIRID3DBioRIDIIPMHS
24 kph – Head Restraint Load24 kph – Head Restraint Load
Top
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