ECE/TRANS/WP.29/GRSP/2019/26

- • jacket and pelvis compression for monitoring purposes only. • jacket and pelvis compression for monitoring purposes only. (no pass/fail criteria).
- • all certification criteria after 3 years. • all certification criteria after 3 years.
- • C4 accelerometer mount. • C4 accelerometer mount.

(v) Repeatability and Reproducibility

196. In testing, good repeatability was obtained if the same dummy was used. However, there were problems with reproducibility among different dummies. Work to establish a common build level for BioRID II, together with dummy improvements and revised certification tests were being discussed to improve their repeatability and reproducibility. 197. At the third meeting, Japan reported on the results of the new dummy calibration methods and sled tests. The same variations in Lower Fz that had been seen in the new certification test method with the simulated head restraint were also observed in the sled tests. Accordingly, it was considered effective to use the head restraint in the certification test, especially to minimize variations around the contact time. However, there were differences in absolute values between certification and sled tests, and so further discussed in September 2010. 198. At the fourth IWG meeting, a quite large difference between sled types was reported when one seat was tested for evaluating the reproducibility using acceleration and deceleration sleds. It was difficult to keep the pulse within the corridor when using the deceleration sled. It was also pointed out that the backset changed due to the movement of dummy head during approach. These issues would continue to be monitored. 199. At the seventh informal meeting, Korea Automobile Testing and Research Institute (KATRI) reported the results of dummy reproducibility in sled tests (with delta-v of 16 km/h and 20 km/h). Comparison of the values (CV) between the two sled speeds shows that, in general, CV was larger at 16 km/h than at 20 km/h, but it was also seen that the tendency was not the same for different evaluation areas. Injury values were not very reproducible, and it was decided to check the dummy specifications (2009–2010), to collect the latest findings and information obtained at this meeting, and to continue the study on reproducibility and repeatability. PDB re-adjusted the BioRID II that it had long used in testing, performed certification tests with the head restraint using the standard and heavy probes as well as verification tests with the accompanying hard bucket seat, and reported the results of these tests. As a result, it concluded that although the reproducibility/repeatability for accelerations was acceptable, the values were not adequate to be used as injury criteria for forces or moments — even though the dummy which satisfied testing with a hard bucket seat had shown poor reproducibility for some data channels. It was thus agreed that round-robin tests be performed between the United States of America and Europe with the dummy used in the PDB testing. 200. At the eighth IWG meeting, Humanetics reported on the round-robin test. Test results from Occupant Safety Research Partnership (OSRP) and Vehicle Research and Testing (VRTC) sled tests did not recreate the results recorded at PDB but OSRP did identify some reproducibility concerns. However, analysis of the results was not complete. IWG would continue to investigate dummy reproducibility. The TEG Chair proposed a WebEX meeting as soon as possible, to schedule future work. The expert from Japan reported a BioRID response differentiation between 095G and other test.* 102G/115 on calibration By swapping the dummy jacket between 012G and 095, the waveform was shifted to correspond with the original dummy jacket’s waveform. The expert from Japan would evaluate the jacket stiffness using the new procedures developed by Humanetics. The expert from the Republic of Korea reported their latest study of test procedure on the variation of dummy response by using FEM model and sled test. The expert from the Republic of Korea noted that the current low level of