1

ProposalProposal for Head Restraint gtrfor Head Restraint gtrPhase 1 Dynamic Option for BioRID IIPhase 1 Dynamic Option for BioRID II

JASIC/Japan

Nov. 2007

2

Option1Head rotation with HY-III < 12 deg

Option2(Contracting Par ties choice)Head rotation with HY-III < 12 deg

or

Some cr iter ia with BioRID IIWaiting for EEVC study

Option3Dismissed

R-point with Backset < 45mm

Static Dynamic Option

OR*

Agreement at #142 WP29 in June 2007Agreement at #142 WP29 in June 2007

EC, Japan, and US Proposal Regarding Next Steps on Head Restraint GTR,WP29-142-23, was agreed at #142 WP29 in June 2007.

Contracting Par ties choice

or

H-point with Backset < 55mm

*: Manufacture choice

3

Reason;・Could be accepted by both USA and EC.• Could keep studying the global dummy and test method

harmonization in the future.・Could harmonize at least in 58 agreement countr ies.

Acceptance

Option

BioRID IIHy-III

--32

Not AcceptIndispensableUSAAcceptAcceptJapan

RecommendNot AcceptEC

1

Proposal for Phase1 Dynamic OptionProposal for Phase1 Dynamic Option

Japan suppor t either “Option 1” or “Option 2”, however , based on the following reasons , we believe “Option2” could be only the solution to compromise different opinion between US and EC.

or

4

Dynamic Test Option (2) for gtr Phase1

EEVCEEVC study result study result

NG

Yes

NO

DDynamic test with ynamic test with BioRID II BioRID II

choice of Contracting

Parties

Head rotation <[12]Yes

NGNO

Dynamic test with Hybrid III

HA-TAHA-TA

5

WhiplashPhenomenon

Phase I:Before Head/Head restraint contact

Phase II:AfterHead/Head restraintcontact

Phase III:Rebound

contactBack set extension flexion

Condition of Dynamic Test for gtr phase1

••Dynamic test for Head restraint gtr Dynamic test for Head restraint gtr Phase1Phase1 should be a alternative should be a alternative test for static Backset, and had better to equivalent to Backsettest for static Backset, and had better to equivalent to Backset..••It is considered with evaluate following phase I stage of whiplaIt is considered with evaluate following phase I stage of whiplash sh phenomenon.phenomenon.

6

Condition of Dynamic Test for gtr phase 1

•• BioRID II is promising with its high biofidelity to the human boBioRID II is promising with its high biofidelity to the human body, dy, but still need to study reproducibility, evaluation indicators, but still need to study reproducibility, evaluation indicators, reference values, test pulse, etc. for appropriate dynamic test.reference values, test pulse, etc. for appropriate dynamic test.

•• It was decided to study as gtr phase 2.It was decided to study as gtr phase 2.

T1G

MyFx

FzHead G

Reproducibility

BioRID-II

05

10HX Acc.

T1 Acc.

Fx

FzMy-Flx.

My-Ext.

HA-TA

Fｚ

Fx

T1 Acc.

NIC, Nkm, Nij, LNL, NIC, Nkm, Nij, LNL, NDCNDC……..

7

Head Movement up to HRCT (Prop. 1 and 2）

Pelvis pointPelvis point

①:Set BioRID II equivalent distance as R-point static backset

0

25

50

75

100

125

0 25 50 75 100

Time(ms)

Acce

lera

tion(

m/s

2 )

FMVSS

②:Measure the Head Center of Gravity Displacement relative to Pelvis point or T1 up to HRCT

Proposal for Dynamic Test for Option (2)

T1T1

or

8

Head Rotation up to HRCT (Prop. 3）

①:Set BioRID II equivalent distance as R-point static backset

0

25

50

75

100

125

0 25 50 75 100

Time(ms)

Acce

lera

tion(

m/s

2 )

FMVSS

②:Measure the Head Center Rotation angle relative to T1 up to HRCT

Proposal for Dynamic Test for Option (2)

T1T1

HA-TAHA-TA

9

Tr ialTr ial TestTestss

• Test samples

•10 seats

( 2 reactive HR)

• Test pulse

•IIWPG pulse *

* FMVSS202a pulse test will be conducted by the end of Dec.

Time［msec］

Acc

eler

atio

n［G

］

Time［msec］

Acc

eler

atio

n［G

］

10

Sample Sample （（Head C. G. Displacement relative to Head C. G. Displacement relative to Pelvis Pelvis andand T1 T1 ））

Relative Displacement [Head C.G.(2)-Pelvis(11)]

-20

0

20

40

60

0 30 60 90 120 150

Time [msec]

Rela

tive D

ispla

cem

ent

[mm

]

34

Relative Displacement [Head C.G.(2)-T1(6)]

-20

0

20

40

60

0 30 60 90 120 150

Time [msec]

Rela

tiv

e D

ispla

cem

ent [

mm

]

39

Head Contact

Head Contact

Relative Displacement [Head C.G.(2)-T1(6)]

-20

0

20

40

60

0 30 60 90 120 150

Time [msec]

Rela

tive D

ispla

cem

ent

[mm

]

11

Head Contact

Seat A (Normal) Seat B (Active)Relative Displacement [Head C.G.(2)-Pelvis(11)]

-40

0

40

80

120

0 30 60 90 120 150

Time [msec]

Rela

tive D

ispla

cem

ent

[mm

]

94

Head Contact

11

HA-TA

-60

-40

-20

0

20

40

0 50 100 150 200 250Time(ms)

Ang

le(d

eg)

BioRID-IIHybrid-IIIContact_BioRID-IIContact_Hybrid-III

HA-TA

-60

-40

-20

0

20

40

0 50 100 150 200 250Time(ms)

Ang

le(d

eg)

BioRID-IIHybrid-IIIContact_BioRID-IIContact_Hybrid-III

HA-TA

-60

-40

-20

0

20

40

0 50 100 150 200 250Time(ms)

Ang

le(d

eg)

BioRID-II

Hybrid-III

Contact_BioRID-IIContact_Hybrid-III

HA-TA

-60

-40

-20

0

20

40

0 50 100 150 200 250Time(ms)

Ang

le(d

eg)

BioRID-IIHybrid-IIIContact_BioRID-IIContact_Hybrid-III

Sample (Head Rotation angle relative to T1 )Sample (Head Rotation angle relative to T1 )Seat A (Normal)

Seat C (Normal)

Seat B (Active)

Seat D (Active)

HA-TAHA-TA

HA：Head Angle TA：Torso Angle

120

10

20

30

40

50

60

70

80

90

100

IIWPG(IIHS, Thacham)　RATING

HE

AD

MO

VE

ME

NT

/ B

AC

KS

ET　（

mm

)

-5

0

5

10

15

20

25

30

HE

AD　

RO

TA

TIO

N　

AN

GLE

　(d

eg)

Relative toHP

ReactiveHR

Relative toT1

ReactiveHR

HeadRotation

ReactiveHR

Poor Marginal Acceptable Good

Comparison between IIWPG Rating and Proposed indicators““Head C.G. displacement relative to T1Head C.G. displacement relative to T1 [ Dynamic [ Dynamic Backset] Backset] ”” show better correlation with IIWPG rating than show better correlation with IIWPG rating than other indicators.other indicators.

HA-TAHA-TA

13

0

10

20

30

40

50

60

70

80

90

100

0 10 20 30 40 50 60 70 80 90 100

Static Backset（HRMD)

Head M

ovem

ent

wit

h I

IWP

G p

uls

e

Relative toT1Reactive HR

Passive HR

Comparison between Static Backset and[Dynamic Backset]

[ Dynamic Backset ] also have [ Dynamic Backset ] also have correlationcorrelation between between static backset, and show the effect of reactive and static backset, and show the effect of reactive and passive head restraint.passive head restraint.

14

Biomechanical BasisJARI Volunteer Mini Sled Test Ser ies

• Method– Freely Sliding Sled on a 10

deg. Ramp– Wooden Rigid Seat without

HR– Velocity = Approx. 8 km/h*

• Volunteers (Average ±S.D.)– 25 (3.8) years old Healthy

Male (n=6)– Height;1.75 (0.31) m, Mass;70

(6.1) kgDetail information were reported by K.Ono in 1998 and 1Detail information were reported by K.Ono in 1998 and 1999999 IRCOBI ConferenceIRCOBI Conference

[ Dynamic Backset ] L[ Dynamic Backset ] Limit value imit value studystudy

15

Test Set-Up and Condition• Dummies

– Hybrid-III (JARI)– BioRID-II Version “G”

(provided from EEVC WG12)– RID3D

(provided from EEVC WG12)

• Dummy Posture– Head X-axis = Horizontal– Hands are rest on the Cross Bar

• Sled Acceleration – See Figure -->

• Number of Tests– Three Repeat Tests were

Conducted in Same Condition• Seat

- Rigid seat without Head Restraint

-5

0

5

10

15

20

25

30

35

40

0 50 100 150 200 250 300Time (msec)

Acc

eler

atio

n (m

/s^2

)

RID3D Test 1RID3D Test 2RID3D Test 3Hybrid III Test 1Hybrid III Test 2Hybrid III Test 3BioRID Test 1BioRID Test 2BioRID Test 3Volunteer Mean

[ Dynamic Backset ] L[ Dynamic Backset ] Limit value imit value studystudy

16

-160

-140

-120

-100

-80

-60

-40

-20

0

20

40

0 50 100 150 200 250 300Time (msec)

Dis

plac

emen

t (m

m)

RID3D Test 1

RID3D Test 2

RID3D Test 3

Hybrid III Test 1

Hybrid III Test 2

Hybrid III Test 3

BioRID Test 1

BioRID Test 2

BioRID Test 3

Upper Limit

Lower Limit

HRCT zone

[ Dynamic Backset ] L[ Dynamic Backset ] Limit value imit value studystudyLimit value may be [40mm], if it is considered that head displacement until HRCT in case of near boarder of volunteer initial symptom pulse.

Linear X Disp. of O.C. to T1 (without Head Restraint)

17

Conclusion & Future action

““ Head C. G. displacement relative to T1Head C. G. displacement relative to T1””[ Dynamic Backset] could be reasonable indicator [ Dynamic Backset] could be reasonable indicator for head restraint gtr phase1 dynamic option for for head restraint gtr phase1 dynamic option for BioRID II.BioRID II.

TentativeTentative limit value limit value may [40mm]may [40mm]

HeadHead C. G. Displacement Relative to T1 up to HRCT C. G. Displacement Relative to T1 up to HRCT [Dynamic Backset] [Dynamic Backset] << [[4040mm] mm]

Appropriate limit value will Appropriate limit value will be studied by the endbe studied by the endof Dec. 2007.of Dec. 2007.

18

We believes ・Gtr should be globally harmonized technical requirements.・One common dynamic test could unify 4 different requirements

in phase 1.To study such one common appropr iate requirement, we strongly propose to establish WG for head restraint gtr phase 2. Japan will come forward as a candidate of technical sponsor .

Proposal to set up a new WG for Phase2Proposal to set up a new WG for Phase2

Head rotation w HY-III < 12 deg

R-point with Backset < 45mm

Static

Dynamic Option

orH-point with Backset < 55mm

OR

Dynamic

Phase 1Phase 1Phase 2Phase 2

Appropriate dynamic testAppropriate dynamic testrequirement w requirement w BioRIDBioRID IIII

Some cr iter ia with BioRID II or

19

ENDEND