January 06 JAPAN MLIT

Transcription

1 January 6 JPN MLIT 1

2 Purpose Dynamic testing methods to reduce damage to the neck of the occupants from a rear-end collision is being studied internationally for head restraints GTR and other regulations. Points of Examination Variance between testing labs and testing procedures Dummy s fidelity to human body Dummy s reproducibility and repeatability Purpose Examine the repeatability and reproducibility of dummy candidates (io-rid II and Hybrid III). 2

3 Method of Evaluation Examine the reproducibility and repeatability of the dummy candidate (io-rid II and Hybrid III) in an HYGE sled test simulating a rear-end collision rigid seat is used to allow a study of dummies characteristics Test three io RID-II dummies (,, ) and three dummies (,, ) five times in the same conditions km/h cceleration(m/s 2 ) Sled waveform 3

4 Specifications of the dummies evaluated Level F Dummy : Owner (With standard calibration) Dummy : Owner (With standard calibration) Dummy : Owner (Without calibration) Dummy : Owner D (With standard calibration) Dummy : Owner (With standard calibration) Dummy : Owner E (With standard calibration) io RID calibration Hit the upper body on the sled with an impactor. ackward tilting angle of the head, backward tilting angle of the neck, acceleration of the first thoracic vertebra (T1), impact load. Hybrid III calibration Head drop test Head acceleration Neck pendulum test (flexion and extension) Head rotating angle, maximum moment hest pendulum test hest displacement, impact load Leg (knees) Impact load Thighs Torque 4

5 Evaluation Indicators cceleration of the first thoracic vertebra (T1) (T1_cc) Shearing load to the neck (Fx) xial load to the neck (Fz) ackward tilting angle of the head (H-T) Referential evaluation cceleration of the head (Head_cc) Neck moment (My) ackward tilting angle of the head (H-T) Referential evaluation cceleration of the first thoracic vertebra (T1)(T1_cc) Shearing load to the neck (Fx) xial load to the neck (Fz) cceleration of the head (Head_cc) Neck moment (My) 5

6 Method and riteria for Evaluation of HR-5-19 Method of evaluation omparison of coefficient of variation V Sd.V = 1 (%) X X = value of each dummy Sd deviation of each dummy riteria dmissible level: V 1 6

7 Response to acceleration of the first thoracic vertebra (T1) HR-5-19 The repeatability of io RID II was within the limit of tolerance for all the three dummies. cceleration(m/s 2 ) T1 x-axis cc cceleration(m/s 2 ) T1 x-axis cc (Reference ) T1 cc. (m/s 2 ).V(%) T1 cc. (m/s 2 ) Hibrid-III.V(%)

8 Response to Shearing Load to the Neck (Fx) The repeatability of io RID II was within the limit of tolerance for all the three dummies. 4 Upper Neck Fx 4 Neck Fx (Reference ) Force(N) 2-2 Force(N) Fx (N) V(%) Fx (N) Hibrid-III.V(%)

9 Response to xial load to the neck (Fz) The repeatability of io RID II was within the limit of tolerance for all the three dummies. (Reference) 1 Upper Neck Fz 1 Neck Fz Force(N) Fz (N) Force(N).V(%) Fz (N) Hibrid-III V(%) 9

10 Response to ackward Tilting ngle of the Head (H-T) The repeatability of io RID II was within the limit of tolerance for all the three dummies. HR-5-19 (Reference) H-T Direction Rotation angle(deg) H-T Rotation angle(deg) H-T H-T (deg).v(%) H-T (deg) Hibrid-III.V(%)

11 Summary of Evaluation of ased on V HR-5-19 For both of io RID-II and, the repeatability of the evaluation indicators was within the limit of tolerance. HX cc. HX cc. H-T 1 5 T1 cc. T1 cc. H-T 1 5 T1 cc. My-Ext. My-Flx. F Fz Fx My-Ext. My-Flx. Fz Fx 11

12 Method and riteria for Evaluation of Reproducibility HR-5-19 Method of evaluation omparison of coefficient of variation V SS Reproducibility.V = 1 (%) X XG S = MS-MSW n 1/2 XG = value of 3 dummies S d MS : square among groups (dummies) MSW : square in a group (each dummy) n : Number of repetitions of test riteria dmissible level: V 1 12

13 Summary of Evaluation of ased on V HR-5-19 For, the reproducibility of the evaluation indicators was within the limit of tolerance. Since calibration was different among the three dummies, evaluation was not possible. H-T H-T My-Ext. HX cc. 1 5 T1 cc. Fx My-Flx. Fz 13

14 Summary of Evaluation of Reproducibility and Summary For repeatability, the evaluation indicators was within the limit of tolerance for both of io RID-II and. For reproducibility, the evaluation indicators was within the limit of tolerance, but evaluation was not possible for io RID-II because calibration method of dummies was different among the dummies. Since io RID-II ensured repeatability, however, it is estimated that reproducibility may be ensured by specifying the method of calibration more in detail. 14