Flex-GT Certification TestsCert01 Cert02 Cert03 Cert04 Cert05 Cert06 Cert07 Cert08 Cert09 Cert10...
Transcript of Flex-GT Certification TestsCert01 Cert02 Cert03 Cert04 Cert05 Cert06 Cert07 Cert08 Cert09 Cert10...
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Flex-GT Certification Tests
NHTSA Vehicle Research & Test Center
Flex-TEG MeetingMarch 31, 2008
akonosuTEG-064
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Overview
• Fabricated test rig– Slight differences from recommended setup
• Conducted 21 tests– Pre & post vehicle test– Analyzed various configurations
• Spacer vs. no spacer• Ballast vs. no ballast• Nylon vs. steel pivot bolt• Physical vs. software offset• Release method
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Test Setup
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Setup Differences
Total padding supplied was 31 mm instead of 25 mm Supported rig
with sandbags instead of bolting it down
Wall thickness is 6.25 mm instead of 4.5 mm
We cut this thin wire to release the leg.
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Effect of 3 mm Spacer & Ballast
• Presence of spacer and ballast did not affect leg measurements at all
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Effect of Pivot Bolt Material• Adjustments to bolt improved pre-impact signal
– Nylon and electrical tape wrap both reduced the magnitude of pre-impact oscillations
-0.5 0 0.5 1 1.5 2Time (sec)
-75
-50
-25
0
25
50
75
100
Tibi
a A
3 M
omen
t (N
- m)
Standard Bolt
Electrical Tape
Electrical Tape w\O-Rings
Nylon bolt
-0.2 -0.15 -0.1 -0.05 0 0.05 0.1Time (sec)
-5
-4
-3
-2
-1
0
1
2
3
4
5
Tibi
a A
3 M
ome n
t (N
-m)
Standard Bolt
Electrical Tape
Electrical Tape w\O-Rings
Nylon bolt
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Offset Removal & Release Method
• Pre-impact offset can be done by post-processing the data rather than physically removing it
• Our release method is consistent
-1 -0.5 0 0.5 1 1.5 2Time (sec)
-75
-50
-25
0
25
50
75
100
Tibi
a A
3 M
omen
t (N
- m)
Cert20
Cert21
Cert22
Release
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CERTIFICATION DATA
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Test Record
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Femur A1
135140145150155160165170175180185
Cer
t01
Cer
t02
Cer
t03
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t04
Cer
t05
Cer
t06
Cer
t07
Cer
t08
Cer
t09
Cer
t10
Cer
t11
Cer
t12
Cer
t14
Cer
t15
Cer
t16
Cer
t17
Cer
t18
Cer
t19
Cer
t20
Cer
t21
Cer
t22
Test
Fem
ur1
Mom
ent (
N-m
)
AVG 158.7SD 4.4CV 2.8%
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Femur A2
110115120125130135140145150155160
Cer
t01
Cer
t02
Cer
t03
Cer
t04
Cer
t05
Cer
t06
Cer
t07
Cer
t08
Cer
t09
Cer
t10
Cer
t11
Cer
t12
Cer
t14
Cer
t15
Cer
t16
Cer
t17
Cer
t18
Cer
t19
Cer
t20
Cer
t21
Cer
t22
Test
Fem
ur2
Mom
ent (
N-m
) AVG 129.1SD 6.8CV 5.2%
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Femur A3
80
85
90
95
100
105
110
115
120C
ert0
1C
ert0
2C
ert0
3C
ert0
4C
ert0
5C
ert0
6C
ert0
7C
ert0
8C
ert0
9C
ert1
0C
ert1
1C
ert1
2C
ert1
4C
ert1
5C
ert1
6C
ert1
7C
ert1
8C
ert1
9C
ert2
0C
ert2
1C
ert2
2
Test
Fem
ur3
Mom
ent (
N-m
)
AVG 98.9SD 7.7CV 7.8%
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Tibia A1
120125130135140145150155160165170C
ert0
1C
ert0
2C
ert0
3C
ert0
4C
ert0
5C
ert0
6C
ert0
7C
ert0
8C
ert0
9C
ert1
0C
ert1
1C
ert1
2C
ert1
4C
ert1
5C
ert1
6C
ert1
7C
ert1
8C
ert1
9C
ert2
0C
ert2
1C
ert2
2
Test
Tibi
a1 M
omen
t (N
-m)
AVG 147.0SD 7.1CV 4.8%
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Tibia A2
80859095
100105110115120125130
Cer
t01
Cer
t02
Cer
t03
Cer
t04
Cer
t05
Cer
t06
Cer
t07
Cer
t08
Cer
t09
Cer
t10
Cer
t11
Cer
t12
Cer
t14
Cer
t15
Cer
t16
Cer
t17
Cer
t18
Cer
t19
Cer
t20
Cer
t21
Cer
t22
Test
Tibi
a2 M
omen
t (N
-m)
AVG 116.2SD 3.6CV 3.1%
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Tibia A3
50556065707580859095
100C
ert0
1C
ert0
2C
ert0
3C
ert0
4C
ert0
5C
ert0
6C
ert0
7C
ert0
8C
ert0
9C
ert1
0C
ert1
1C
ert1
2C
ert1
4C
ert1
5C
ert1
6C
ert1
7C
ert1
8C
ert1
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ert2
0C
ert2
1C
ert2
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Test
Tibi
a3 M
omen
t (N
-m)
AVG 88.8SD 3.1CV 3.5%
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Tibia A4
0
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60C
ert0
1C
ert0
2C
ert0
3C
ert0
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ert0
5C
ert0
6C
ert0
7C
ert0
8C
ert0
9C
ert1
0C
ert1
1C
ert1
2C
ert1
4C
ert1
5C
ert1
6C
ert1
7C
ert1
8C
ert1
9C
ert2
0C
ert2
1C
ert2
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Test
Tibi
a4 M
omen
t (N
-m)
AVG 46.7
SD 2.2
CV 4.8%
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ACL
0.0
1.0
2.0
3.0
4.0
5.0
6.0C
ert0
1C
ert0
2C
ert0
3C
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ert0
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6C
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7C
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8C
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9C
ert1
0C
ert1
1C
ert1
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ert1
4C
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5C
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ert1
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ert1
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0C
ert2
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ert2
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Test
AC
L El
onga
tion
(mm
)
AVG 4.2SD 0.1CV 3.2%
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PCL
0.00.51.01.52.02.53.03.54.04.55.0C
ert0
1C
ert0
2C
ert0
3C
ert0
4C
ert0
5C
ert0
6C
ert0
7C
ert0
8C
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9C
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0C
ert1
1C
ert1
2C
ert1
4C
ert1
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ert1
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ert1
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ert1
8C
ert1
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0C
ert2
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ert2
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Test
PCL
Elon
gatio
n (m
m)
AVG 3.9
SD 0.3
CV 7.5%
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MCL
10.010.511.011.512.012.513.013.514.014.5
Cer
t01
Cer
t02
Cer
t03
Cer
t04
Cer
t05
Cer
t06
Cer
t07
Cer
t08
Cer
t09
Cer
t10
Cer
t11
Cer
t12
Cer
t14
Cer
t15
Cer
t16
Cer
t17
Cer
t18
Cer
t19
Cer
t20
Cer
t21
Cer
t22
Test
MC
L El
onga
tion
(mm
)
AVG 13.5SD 0.3CV 1.9%
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Summary• Certification test does not seem to be sensitive
to any of the following:– Rig connection/support– Impact plate width– Release method– Offset method
• Isolation of leg from rig seems to help reduce noise in moment signals
• Certification data was very repeatable, but did not always fall within the provided corridors
Flex-GT Certification TestsOverviewTest SetupSetup DifferencesEffect of 3 mm Spacer & BallastEffect of Pivot Bolt MaterialOffset Removal & Release MethodTest RecordFemur A1Femur A2Femur A3Tibia A1Tibia A2Tibia A3Tibia A4ACLPCLMCLSummary