Hybrid III 3-Year Old Child Dummy User's Manual J2857_201103

DOI: https://doi.org/10.4271/J2857_201103

Issuing Committee: Dummy Testing and Equipment Committee

Publisher: SAE International

Pages: 83

Rationale: J2857 replaced EA-31 in 2011. In addition to the format change and the correction of typographical and grammatical errors, the following corrections were made to this Information Report: "Calibration Tests" was changed to "Certification Tests" throughout the report. References to SAE J211 were changed to J211-1 throughout the report Section 1 SCOPE - added Section 2 REFERENCES - corrected spelling from "Qwings" to "Owings" Section 2 REFERENCES – corrected spelling from “Reynold” to “Reynolds.” Section 2 REFERENCES – added “SAE J211-1 – Instrumentation for Impact Test – Part 1 – Electronic Instrumentation.” Section 2 REFERENCES – added “SAE J2517 – Hybrid III Family Chest Potentiometer Calibration.” Section 3 – definitions of certification test and inspection test were consolidated from various sections of EA-31 to Section 3 of J2857 Section 3.3.1 - deleted drawing references and changed the description of the shirt and pants from "Children's XS (size 4–5) thermal knit, waffle weave, 50%/50% polyester and cotton underwear or equivalent. The shirt and pant should weigh no more than 0.18 kg (0.4 lb) total together. (Note: pants must end above the knee)" in EA-31 to "Children's XS (size 4–5) cotton-polyester based, tight-fitting shirt with long sleeves and ankle-length pants. The neckline must be small enough to prevent contact between the shoulder belt and the dummy's flesh. The shirt and pant should weigh no more than 0.25 kg (0.55 lb)." to harmonize with NHTSA specifications. Other SAE Documents – moved to REFERENCES Section 4 – updated address for Reprographic Technologies Section 5 – added paragraph to refer to Table 1. Added “TABLE 1 – TORQUE SPECIFICATIONS” to the first table in the section. Indexed all other table numbers accordingly. Section 7.1 – changed section header from “Disassembly/Reassembly and Inspection” in EA-31 to “Complete Assembly” in J2857 Section 7.1.1 – corrected length of shoulder dampers from “19.5 mm (3/4 inch)” in EA-31 to “19.1 mm (3/4 inch)” in J2857 Section 7.1.2 – changed joint setting from “1–2 g” in EA-31 to “1 g” for consistency with procedures in Appendix C. Added sentence “Refer to Appendix C – Joint Adjustment Procedures” Section 7.2 – changed section header from “Head/Neck” in EA-31 to “Head” to more accurately represent the contents of the section Section 7.2.1 and 7.2.2– moved note, “Make sure that there is a good tight fit between the head skin and the skull when reassembled. (Refer to Appendix B – Guidelines for Flesh Repair)” from 7.2.1 Head Disassembly to 7.2.2 Head to Upper Neck Reassembly Section 7.2.2 – changed section header from “Head to Upper Neck Reassembly” to “Head Reassembly” to more accurately represent the contents of the section Sections 7.2.2 – changed “headskin” to “head skin” for consistency with parts list Section 7.3.2 – changed “upper load cell” and “lower load cell” to “upper neck load cell” and “lower neck load cell” for consistency with Table 2 Section 7.3.2 – deleted “If you are not doing any more work on upper/lower torso then reassemble these, being careful not to damage the chest deflection arm when you reconnect it” because it does not pertain the reassembly of the neck Section 7.3.2 – changed “the Y & Z axis sign convention will be opposite between the top and the bottom” in EA-31 to “the Y & Z axis sign convention will be opposite between the upper and lower neck load cells” Section 7.4 – changed section header from “Upper/Lower Torso” in EA-31 to “Upper Torso” to more accurately represent the contents of the section Section 7.4.2 – added “Be careful not to damage the chest deflection arm while reconnecting it.” Section 7.5 – changed section header from “Complete Shoulder Assembly” to “Complete Shoulder” for consistency with other headers Section 7.5.2 – corrected metric equivalent from “1.1 – 1.4 N-m” to “1.13 – 1.36 N-m” Section 7.6 – changed section header from “Lower Torso Section” to “Lower Torso” for consistency with other headers Section 7.6.1 – changed “A.S.I.S. simulator” to “A.S.I.S. load cell simulator” for consistency with the rest of this section Sections 8.1.4 and 8.1.5 – changed “1-g joint tension” in EA-31 to “1-g joint setting” for consistency with Appendix C Section 9.1 (B) – changed head mass from “2.70 kg ± 0.05 kg (5.95 lb ± 0.10 lb)” to “2.724 kg ± 0.045 kg (6.00 lb ± 0.01 lb)” to be consistent with NHTSA drawing number 210-0000 sheet 6 Section 9.1 (E) 2 – changed “18.9 to 25.6 °C (66 to 78 °F)” in EA-31 to “20.6 to 22.2 °C (69 to 72 °F)” Section 9.2 (E) 3 – removed time window specification from the peak D-plane rotation in the neck flexion certification test Section 9.2 (E) 4 – changed the peak moment specification from a minimum value of “40 N-m (29.5 ft-lbf)” in EA-31 to “42 N-m (31.0 ft-lbf)” to harmonize with NHTSA specifications for the neck flexion certification test Section 9.2 (E) 4 – corrected English equivalent of the pendulum impulse (flexion) at 20 ms Section 9.2 (F) 3 – removed time window specification from the peak D-plane rotation in the neck extension certification test Section 9.2 (F) 4 – changed the peak moment specification from a maximum of “−41 N-m (−30.2 ft-lbf)” and a minimum of “−56 N-m (41.3 ft-lbf)” in EA-31 to a maximum of “−43.7 N-m (−32.2 ft-lbf)” and a minimum of “−53.3 N-m (−39.3 ft-lbf)” to harmonize with NHTSA specifications for the neck extension certification test Section 9.3 (C) – changed filter class of sternum displacement from 180 in EA-31 to 600 as specified in SAE J211-1 Section 9.3 (D) 7 – changed “set the limbs to 1 to 2 g’s” to “set the joints to 1 g” Section 9.3 (E) 1 – added new performance specification for the thorax impact test “During the time interval while the deflection is between 12.5 and 32 mm, the peak force shall be less than 0.91 kN (205 lbf). Calculate this force by multiplying the test probe mass, defined in (B), by its acceleration” and indexed all subsequent performance specifications Section 9.3 (E) 3 – changed the peak probe force specification from “not less than 0.65 kN (146 lbf) and not more than 0.85 kN (191 lbf)” in EA-31 to “not less than 0.68 kN (153 lbf) and not more than 0.81 kN (182 lbf)” to harmonize with NHTSA specifications for the thorax impact test Section 9.4 – changed section header from "Chest Depth Procedure" to "Chest Depth Measurement Procedure" Section 10.1, Table 3 – changed hip pivot height from 1.5 inches or 38.1 mm to 1.55 inches or 39.4 mm Section 10.1, Table 3 – changed shoulder pivot from backline dimension from 2.50 inches or 63.5 mm to 2.60 inches or 66.0 mm Section 10.1, Table 3 – changed buttock to knee length dimension from 11.61 inches or 294.9 mm to 11.51 inches or 292.4 mm Section 10.1, Table 3 – changed popliteal height from 9.00 inches or 228.6 mm to 8.90 inches or 226.1 mm Section 10.1, Table 3 – changed chest depth with jacket dimension from 5.60 inches or 142.2 mm to 5.75 inches or 146.1 mm Section 10.2 – changed title of Table 4 from “ASSEMBLY WEIGHTS” to “ASSEMBLY MASSES” and changed the last entry in the Assembly column from “Total Dummy Weight” to “Total Dummy Mass” Section 10.2, Table 4 – changed tolerance on upper leg mass from ± 0.20 lbs or ± 0.09 kg to ± 0.15 lbs or ± 0.07 kg Section 10.2, Table 4 – corrected metric equivalent of total dummy mass from 16.17 kg to 16.19 kg Section 10.2, Table 4 – changed tolerance on total dummy mass from ± 1.80 lbs or ± 0.82 kg to ± 1.70 lbs or ± 0.77 kg Section 10.4 (B) 1 – added metric equivalent to temperature range Section 10.4 (B) 5 – changed joint setting from “1–2 g” in EA-31 to “1 g” for consistency with procedures in Appendix C. Added sentence “Refer to APPENDIX C – JOINT ADJUSTMENT PROCEDURES.” Section 10.4 (B) 7 – added “Position the upper arms downward” and changed “point the forearms upward” in EA-31 to “point the forearms forward” in J2857 to harmonize with NHTSA’s procedure for the torso flexion test Section 10.4 (B) 9 – deleted “Position the torso of the dummy so that the spine box instrument cavity is not more than 15 degrees forward of vertical” to harmonize with NHTSA’s procedure for the torso flexion test Section 10.4 (B) – added steps 10 and 11 to harmonize with NHTSA’s procedure for the torso flexion test. Indexed the remaining steps accordingly. Section 10.4 (B) – added step 13 to harmonize with NHTSA’s procedure for the torso flexion test. Section 10.4 (C) – added specification “Within 3 to 4 minutes after releasing the applied force, the measured angle of the spine box instrument cavity mating surface shall be less than 10 degrees.” Index was deleted