the t1g of hybrid-iii for whiplash injury evaluation · the t1g of hybrid-iii for whiplash injury...
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The T1G of Hybr id-III for Whiplash Injury Evaluation
JAPAN/ MLITApril 2006
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Neck Injury Evaluation Cr iter ia
• For neck injury evaluation, the S-shape curving of the neck must be considered. Conventional view
Bostrom et al, A New Neck Injury Criterion Candidate Based on Injury Findings in the Cervical Spinal Ganglia After Experimental Neck Exteision Trauma,1996 IRCOBI Conference
Phase 1 Phase 2 Phase 3
Cited from Japan's presentation material
for 4th GTR Meeting
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Axial force
Bending moment
C5/6 open book-like motion
C5
C6
Facet impingement
Initial flexion S-shapeFull extension
initial flexion S-shape curvature full extension
Cited from Japan's presentation material
for 4th GTR Meeting
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Existing Neck Injury Evaluation Methods
All the methods using upper and lower neck cr iter ia– IIWPG – T1G, HRC, Fx, Fz– EuroNCAP – NIC, Nkm, Head rebound V, (draft) Fx, Fz, T1G, HRC
T1G
MyFx
Fz
HrV
HRC
NIC: Calculated from acceleration/velocity of the head and T1
Nkm: Calculated from neck moment and neck shear force
HeadG
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To ver ify different biomechanical responses of HY-III and BioRID II
HY-III BioRID II
Biomechanical Responses of HY-III and BioRID II Par t1Cited from Japan's presentation material
for 3rd GTR Meeting
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•BioRID II is closer in terms of S-shape deformation pattern of the neck and the head/neck angle relative to T1 of human volunteer than HY-III.
Kinematics
HA-TA
-60
-40
-20
0
20
0 50 100 150 200 250Time(ms)
Angle
(deg)
Ave.±1(S.D)
BioRID-II
Hybrid-III
T1-HP
-20
0
20
40
60
0 50 100 150 200 250Time(ms)
Dis
tance(m
m)
Ave.±1(S.D) BioRID-II Hybrid-III
HA-TAHA-TAT1-HP
HA: Head Angle,TA: Torso Angle T1-HP: Length change between T1 and Hip point
Cited from Japan's presentation material
for 3rd GTR Meeting
HY-IIIの挙動は人体と異なるが、ピークレベルは近い
HY-IIIの挙動、ピーク レベル共に人体と異なる
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Hyge Sled TestTo ver ify the different biomechanical responses of HY-III
and BioRID II due to different seat character istics.
HY-III
BioRID II
Seat A : Normal Head Rest
Seat B : Active Head Rest
Seat C : Normal Head Rest
Seat D : Active Head Rest
Types of Tests
Cited from Japan's presentation material
for 3rd GTR Meeting
Biomechanical Responses of HY-III and BioRID II Par t2HR-6-5
6
8
10
12
14
16
6 8 10 12 14 16
BioRID II T1G (G)
HY
-III
T1G
(G)
Seat ASeat BSeat CSeat D
T1G Compar ison between Hybr id-III and BioRID II
Because the T1G values of Hybr id-III and the more biofidelic BioRID II cor relate inversely, the T1G of Hybrid-III is inappropr iate as a neck injury evaluation cr iter ion.
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0
5
10
15
20
25
30
35
IIWPG rating
FMV
SS20
2a (h
ead
back
war
d in
clin
atio
n an
gle)
POOR MARGINAL ACCEPTABLE GOOD
12°
Seat A
Seat D
Seat BSeat C
5
7
9
11
13
15
IIWPG ratingT
1G (H
Y-I
II)
POOR MARGINAL ACCEPTABLE GOOD
Seat A
Seat D
Seat B
Seat C
Hybrid-III's head backward inclination angle vs BioRID-II's IIWPG rating
Hybrid-III's T1G vs BioRID-II'sIIWPG rating
Hybr id-III's Head Backward Inclination/T1G vs BioRID-II's IIWPG Rating
Roughly Fair correlation Inverse correlation
Hybr id-III の場合、T1G加速度よりも頭部後傾角の方が生体忠実性のより良いBioRID IIの評価指標と相関がある。
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Bio R ID2 v s HY-I I I
0
5
10
15
20
25
30
Bio RID2 IIHS SCORE
HY
-II
I (H
ead
Ro
tati
on
An
gle
)
Act2
Act3
Pas1
Pas2
Pas3
Pas4
Pas6
Pas7
Pas8POOR MARGINAL ACCEPTABL GOOD
FMVSS 202a (HY-III) vs IIWPG (BioRID-II) Evaluations
12
HY-III頭部後傾角要件の妥当性検証
頭部後傾角の要件は生体忠実性の低さから傷害低減効果を示す根拠が不十分であり、技術的実現性から決めるのが妥当と考えるが、
現提案[頭部後傾角≦12°]は IIHSアセスメント実力との相関性検証結果から厳しすぎると考えられる。
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ConclusionsS-shape curving of the neck is impor tant.Desirable to measure both upper /lower neck cr iter ia.Hybrid-III' s T1G is an inappropr iate cr iter ion for the
following reasons: -生体忠実性が低い
- Inversely correlates with biofidelic BioRID-II' s T1G.- Inversely correlates with IIWPG rating.
If Hybrid-III is to be used, head backward inclination angle is more reliable a neck injury evaluation cr iter ion than T1G.しかしながら、現要件 案[12°以下]の妥当性はさらに検証要と考える。
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Conclusions将来的には、ダミーだけでなくスレッド波形も含めて、より市場の事故実態と相関性のある、(オプションではない)本来のダイナミック要件とすることが必要であり、その旨gtrプレアンブルにフェーズ2で検討すべき事項と記載することが望まれる。
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