49 C.F.R. Subpart N—Six-year-old Child Test Dummy, Beta Version
Title 49 - Transportation
Source: 65 FR 2065, Jan. 13, 2000, unless otherwise noted.
(a) The following materials are hereby incorporated into this subpart by reference: (1) A drawings and inspection package entitled “Parts List and Drawings, Hybrid III Six-year-old Child Test Dummy (H-III6C, Beta Version) (June 2002)”, consisting of: (i) Drawing No. 127–1000, 6-year H3 Head Complete, (ii) Drawing No. 127–1015, Neck Assembly, (iii) Drawing No. 127–2000, Upper Torso Assembly, (iv) Drawing No. 127–3000, Lower Torso Assembly, (v) Drawing No. 127–4000–1 and 4000–2, Leg Assembly, (vi) Drawing No. 127–5000–1 and 5000–2, Arm Assembly, and (vii) The Hybrid III Six-year-old Child Parts/Drawing List. (2) A procedures manual entitled “Procedures for Assembly, Disassembly, and Inspection (PADI) of the Hybrid III 6-year-old Child Crash Test Dummy (H-III6C), Beta Version, June 2002”; (3) SAE Recommended Practice J211–1995 Instrumentation for Impact Tests—Parts 1 and 2, dated March, 1995”; (4) SAE J1733 Information Report, titled “Sign Convention for Vehicle Crash Testing”, dated December 1994. (b) The Director of the Federal Register approved those materials incorporated by reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the materials may be inspected at NHTSA's Technical Reference Library, 400 Seventh Street SW., room 5109, Washington, DC, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202–741–6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. (c) The incorporated materials are available as follows: (1) The drawings and specifications package and the PADI document referred to in subparagraph (a) are accessible for viewing and copying at the Department of Transportation Docket's public area, Plaza 401, 400 Seventh St., SW., Washington, DC 20590, and may be downloaded from dms.dot.gov. They are also available from Reprographic Technologies, 9107 Gaither Rd, Gaithersburg, MD 200877, (301) 419–5070. (2) The SAE materials referred to in paragraphs (a)(3) and (a)(4) of this section are available from the Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096. [65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47327, July 18, 2002] (a) The Hybrid III type 6-year-old dummy is defined by drawings and specifications containing the following materials: (1) Technical drawings and specifications package P/N 127–0000, the titles of which are listed in Table A; (2) Procedures for Assembly, Disassembly, and Inspection (PADI) of the Hybrid III 6-year-old test dummy, Alpha version (August 1999). (b) Adjacent segments are joined in a manner such that except for contacts existing under static conditions, there is no contact between metallic elements throughout the range of motion or under simulated crash impact conditions. (c) The structural properties of the dummy are such that the dummy must conform to this Subpart in every respect before use in any test similar to those specified in Standard 208, “Occupant Crash Protection”, and Standard 213, “Child Restraint Systems”. (a) The head assembly for this test consists of the complete head (drawing 127–1000), a six-axis neck transducer (drawing SA572–S11) or its structural replacement (drawing 78051–383X), a head to neck-to-pivot pin (drawing 78051–339), and 3 accelerometers (drawing SA572–S4). (b) When the head assembly in paragraph (a) of this section is dropped from a height of 376.0 ±1.0 mm (14.8 ±0.04 in) in accordance with paragraph (c) of this section, the peak resultant acceleration at the location of the accelerometers at the head CG may not be less than 245 G or more than 300 G. The resultant acceleration vs. time history curve shall be unimodal; oscillations occurring after the main pulse must be less than 10 percent of the peak resultant acceleration. The lateral acceleration shall not exceed 15 g's (zero to peak). (c) Head test procedure. The test procedure for the head is as follows: (1) Soak the head assembly in a controlled environment at any temperature between 18.9 and 25.6 °C (66 and 78 °F) and a relative humidity from 10 to 70 percent for at least four hours prior to a test. (2) Prior to the test, clean the impact surface of the skin and the impact plate surface with isopropyl alcohol, trichloroethane, or an equivalent. The skin of the head must be clean and dry for testing. (3) Suspend the head assembly as shown in Figure N1. The lowest point on the forehead must be 376.0 ±1.0 mm (14.8 ±0.04 in) from the impact surface and the head must be oriented to an incline of 62 ±1 deg. between the “D” plane as shown in Figure N1 and the plane of the impact surface. The 1.57 mm (0.062 in) diameter holes located on either side of the dummy's head shall be used to ensure that the head is level with respect to the impact surface. (4) Drop the head assembly from the specified height by means that ensure a smooth, instant release onto a rigidly supported flat horizontal steel plate which is 50.8 mm (2 in) thick and 610 mm (24 in) square. The impact surface shall be clean, dry and have a micro finish of not less than 203.2. × 10−6 mm (8 micro inches) (RMS) and not more than 2032.0 × 10−6 mm (80 micro inches) (RMS). (5) Allow at least 2 hours between successive tests on the same head. (a) The neck assembly for the purposes of this test consists of the assembly of components shown in drawing 127–1015. (b) When the head-neck assembly consisting of the head (drawing 127–1000), neck (drawing 127–1015), pivot pin (drawing 78051–339), bib simulator (drawing TE127–1025, neck bracket assembly (drawing 127–8221), six-axis neck transducer (drawing SA572–S11), neck mounting adaptor (drawing TE–2208–001), and three accelerometers (drawing SA572–S4) installed in the head assembly as specified in §572.122, is tested according to the test procedure in paragraph (c) of this section, it shall have the following characteristics: (1) Flexion. (i) Plane D, referenced in Figure N2, shall rotate in the direction of preimpact flight with respect to the pendulum's longitudinal centerline between 74 degrees and 92 degrees. Within this specified rotation corridor, the peak moment about the occipital condyles shall be not less than 27 N-m (19.9 ft-lbf) and not more than 33 N-m (24.3 ft-lbf). (ii) The positive moment shall decay for the first time to 5 N-m (3.7 ft-lbf) between 103 ms and 123 ms. (iii) The moment shall be calculated by the following formula: Moment (N-m) = My−(0.01778m) × (FX). (iv) My is the moment about the y-axis and FX is the shear force measured by the neck transducer (drawing SA572–S11) and 0.01778m is the distance from force to occipital condyle. (2) Extension. (i) Plane D, referenced in Figure N3, shall rotate in the direction of preimpact flight with respect to the pendulum's longitudinal centerline between 85 degrees and 103 degrees. Within this specified rotation corridor, the peak moment about the occipital condyles shall be not more than −19 N-m (−14 ft-lbf) and not less than −24 N-m (−17.7ft-lbf). (ii) The negative moment shall decay for the first time to −5 N-m (−3.7 ft-lbf) between 123 ms and 147 ms. (iii) The moment shall be calculated by the following formula: Moment (N-m)=My−(0.01778m)×(FX). (iv) My is the moment about the y-axis and FX is the shear force measured by the neck transducer (drawing SA572–S11) and 0.017778m is the distance from force to occipital condyle. (3) Time-zero is defined as the time of initial contact between the pendulum striker plate and the honeycomb material. (c) Test procedure. The test procedure for the neck assembly is as follows: (1) Soak the neck assembly in a controlled environment at any temperature between 20.6 and 22.2 °C (69 and 72 °F) and a relative humidity between 10 and 70 percent for at least four hours prior to a test. (2) Torque the jam nut (drawing 9000341) on the neck cable (drawing 127–1016) to 0.23 ±0.02 N-m (2.0 ±0.2 in-lbs). (3) Mount the head-neck assembly, defined in paragraph (b) of this section, on the pendulum so the midsagittal plane of the head is vertical and coincides with the plane of motion of the pendulum as shown in Figure N2 for flexion tests and Figure N3 for extension tests. (4) Release the pendulum and allow it to fall freely from a height to achieve an impact velocity of 4.95 ±0.12 m/s (16.2 ±0.4 ft/s) for flexion tests and 4.3 ±0.12 m/s (14.10 ±0.40 ft/s) for extension tests, measured by an accelerometer mounted on the pendulum as shown in Figure 22 of 49 CFR 572 at the instant of contact with the honey comb. (i) Time-zero is defined as the time of initial contact between the pendulum striker plate and the honeycomb material. All data channels should be at the zero level at this time. (ii) Stop the pendulum from the initial velocity with an acceleration vs. time pulse which meets the velocity change as specified below. Integrate the pendulum acceleration data channel to obtain the velocity vs. time curve: (a) Thorax (upper torso) assembly. The thorax consists of the part of the torso assembly shown in drawing 127–2000. (b) When the anterior surface of the thorax of a completely assembled dummy (drawing 127–0000) is impacted by a test probe conforming to section 572.127(a) at 6.71 ±0.12 m/s (22.0 ±0.4 ft/s) according to the test procedure in paragraph (c) of this section: (1) The maximum sternum displacement (compression) relative to the spine, measured with chest deflection transducer (drawing SA572-S50), must be not less than 38.0 mm (1.50 in) and not more than 46.0 mm (1.80 in). Within this specified compression corridor, the peak force, measured by the probe in accordance with section 572.127, shall not be less than 1150 N (259 lbf) and not more than 1380 N (310 lbf). The peak force after 12.5 mm (0.5 in) of sternum displacement but before reaching the minimum required 38.0 mm (1.5 in) sternum displacement limit shall not exceed 1500 N (337.2 lbf). (2) The internal hysteresis of the ribcage in each impact as determined by the plot of force vs. deflection in paragraph (b)(1) of this section shall be not less than 65 percent but not more than 85 percent. (c) Test procedure. The test procedure for the thorax assembly is as follows: (1) Soak the dummy in a controlled environment at any temperature between 20.6° and 22.2 °C (69° and 72 °F) and a relative humidity between 10 and 70 percent for at least four hours prior to a test. (2) Seat and orient the dummy, wearing tight-fitting underwear or equivalent consisting of a size 5 short-sleeved shirt having a weight less than 0.090 kg (0.2 lb) and an opening at the top just large enough to permit the passage of the head with a tight fit, and a size 4 pair of long pants having a weight of less than 0.090 kg (0.2 lb) with the legs cut off sufficiently above the knee to allow the knee target to be visible, on a seating surface without back support as shown in Figure N4, with the limbs extended horizontally and forward, parallel to the midsagittal plane, the midsagittal plane vertical within ±1 degree and the ribs level in the anterior-posterior and lateral directions within ±0.5 degrees. (3) Establish the impact point at the chest midsagittal plane so that the impact point of the longitudinal centerline of the probe coincides with the midsagittal plane of the dummy within ±2.5 mm (0.1 in) and is 12.7 ±1.1 mm (0.5 ±0.04 in) below the horizontal-peripheral centerline of the No. 3 rib and is within 0.5 degrees of a horizontal line in the dummy's midsagittal plane. (4) Impact the thorax with the test probe so that at the moment of contact the probe's longitudinal center line falls within 2 degrees of a horizontal line in the dummy's midsagittal plane. (5) Guide the test probe during impact so that there is no significant lateral, vertical or rotational movement. (6) No suspension hardware, suspension cables, or any other attachments to the probe, including the velocity vane, shall make contact with the dummy during the test. [65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47327, July 18, 2002] (a) Upper/lower torso assembly. The test objective is to determine the stiffness effects of the lumbar spine (drawing 127–3002), including cable (drawing 127–8095), mounting plate insert (drawing 910420–048), nylon shoulder bushing (drawing 9001373), nut (drawing 9001336), and abdominal insert (drawing 127–8210), on resistance to articulation between upper torso assembly (drawing 127–2000) and lower torso assembly (drawing 127–3000). (b)(1) When the upper torso assembly of a seated dummy is subjected to a force continuously applied at the head to neck pivot pin level through a rigidly attached adaptor bracket as shown in Figure N5 according to the test procedure set out in paragraph (c) of this section, the lumbar spine-abdomen assembly shall flex by an amount that permits the upper torso assembly to translate in angular motion until the machined rear surface of the instrument cavity at the back of the thoracic spine box is at 45 ±0.5 degrees relative to the vertical transverse plane, at which time the force applied as shown in Figure N5 must be not less than 147 N (33 lbf) and not more than 200 N (45 lbf), and (2) Upon removal of the force, the torso assembly must return to within 8 degrees of its initial position. (c) Test procedure. The test procedure for the torso assemblies is as follows: (1) Soak the dummy in a controlled environment at any temperature between 18.9 and 25.6 °C (66 and 78 °F) and a relative humidity between 10 and 70 percent for at least four hours prior to a test. (2) Attach the dummy (with or without the legs below the femurs) to the fixture in a seated posture as shown in Figure N5. (3) Secure the pelvis at the pelvis instrument cavity rear face by threading four (4) Flex the thorax forward three times between vertical and until the torso reference plane, as shown in figure N5, reaches 30 ±2 degrees from vertical. Bring the torso to vertical orientation, remove all externally applied flexion forces, and wait 30 minutes before conducting the test. During the 30-minute waiting period, the dummy's upper torso shall be externally supported at or near its vertical orientation to prevent sagging. (5) Remove the external support and wait two minutes. Measure the initial orientation of the torso reference plane of the seated, unsupported dummy as shown in Figure N5. This initial torso orientation angle may not exceed 22 degrees. (6) Attach the loading adapter bracket to the spine of the dummy, the pull cable, and the load cell as shown in Figure N5. (7) Apply a tension force in the midsagittal plane to the pull cable as shown in Figure N5 at any upper torso deflection rate between 0.5 and 1.5 degrees per second, until the torso reference plane is at 45 ±0.5 degrees of flexion relative to the vertical transverse plane as shown in Figure N5. (8) Continue to apply a force sufficient to maintain 45 ±0.5 degrees of flexion for 10 seconds, and record the highest applied force during the 10-second period. (9) Release all force as rapidly as possible, and measure the return angle at 3 minutes or any time thereafter after the release. (a) Knee assembly. The knee assembly is part of the leg assembly (drawing 127–4000–1 and –2). (b) When the knee assembly, consisting of knee machined (drawing 127–4013), knee flesh (drawing 127–4011), lower leg (drawing 127–4014), the foot assembly (drawing 127–4030–1(left) and -2 (right)) and femur load transducer (drawing SA572-S10) or its structural replacement (drawing 127–4007) is tested according to the test procedure in section 572.127(c), the peak resistance force as measured with the test probe mounted accelerometer must be not less than 2.0 kN (450 lbf) and not more than 3.0 kN (674 lbf). (c) Test procedure. The test procedure for the knee assembly is as follows: (1) Soak the knee assembly in a controlled environment at any temperature between 18.9 and 25.6 °C (66 and 78 °F) and a relative humidity from 10 to 70 percent for at least four hours prior to a test. (2) Mount the test material and secure it to a rigid test fixture as shown in Figure N6. No contact is permitted between any part of the foot or tibia and any exterior surface. (3) Align the test probe so that throughout its stroke and at contact with the knee it is within 2 degrees of horizontal and collinear with the longitudinal centerline of the femur. (4) Guide the pendulum so that there is no significant lateral vertical or rotational movement at time-zero. (5) The test probe velocity at the time of contact shall be 2.1 ±0.03 m/s (6.9 # 0.1 ft/s). (6) No suspension hardware, suspension cables, or any other attachments to the probe, including the velocity vane, shall make contact with the dummy during testing. [65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47328, July 18, 2002] (a) The test probe for thoracic impacts, except for attachments, shall be of rigid metal or metal alloy construction and concentric about its longitudinal axis. Any attachments to the impactor, such as suspension hardware, velocity vanes, etc., must meet the requirements of §572.124(c)(6). The impactor shall have a mass of 2.86 ±0.02 kg (6.3 ±0.05 lb) and a minimum mass moment of inertia of 160 kg-c2 (0.141 lb-in-sec2 ) in yaw and pitch about the CG of the probe. One third of the weight of suspension cables and any attachments to the impact probe must be included in the calculation of mass, and such components may not exceed five percent of the total weight of the probe. The impacting end of the probe, has a flat, continuous, and non-deformable 101.6 ±0.25 mm (4.00 ±0.01 in) diameter face with an edge radius of 7.6/12.7 mm (0.3/0.5 in). The impactor shall have a 101–103 mm (4.0–4.1 in) diameter cylindrical surface extending for a minimum of 12.5 mm (0.5 in) to the rear from the impact face. The probe's end opposite to the impact face has provisions for mounting an accelerometer with its sensitive axis collinear with the longitudinal axis of the probe. The impact probe shall have a free air resonant frequency of not less than 1000 Hz limited to the direction of the longitudinal axis of the impactor. (b) The test probe for knee impacts, except for attachments, shall be of rigid metal or alloy construction and concentric about its longitudinal axis. Any attachments to the impactor, such as suspension hardware, velocity vanes, etc., must meet the requirements of §572.126(c)(6). The impactor shall have a mass of 0.82 ±0.02 kg (1.8 ±0.05 lb) and a minimum mass moment of inertia of 34 kg-cm2 (0.03 lb-in-sec2) in yaw and pitch about the CG of the probe. One third of the weight of suspension cables and any attachments to the impact probe must be included in the calculation of mass, and such components may not exceed five percent of the total weight of the probe. The impacting end of the probe, has a flat, continuous, and non-deformable 76.2 ±0.2 mm (3.00 ±0.01 in) diameter face with an edge radius of 7.6/12.7 mm (0.3/0.5 in). The impactor shall have a 76–77 mm (3.0–3.1 in) diameter cylindrical surface extending for a minimum of 12.5 mm (0.5 in) to the rear from the impact face. The probe's end opposite to the impact face has provisions for mounting an accelerometer with its sensitive axis collinear with the longitudinal axis of the probe. The impact probe shall have a free air resonant frequency of not less than 1000 Hz limited to the direction of the longitudinal axis of the impactor. (c) Head accelerometers shall have dimensions, response characteristics, and sensitive mass locations specified in drawing SA572–S4 and be mounted in the head as shown in drawing 127–0000 sheet 3. (d) Neck force/moment transducer. (1) The upper neck force/moment transducer shall have the dimensions, response characteristics, and sensitive axis locations specified in drawing SA572–S11 and be mounted in the head-neck assembly as shown in drawing 127–0000 sheet 3. (2) The optional lower neck force/moment transducer shall have the dimensions, response characteristics, and sensitive axis locations specified in drawing SA572–S26 and be mounted as shown in drawing 127–0000 sheet 3. (e) The thorax accelerometers shall have the dimensions, response characteristics, and sensitive mass locations specified in drawing SA572–S4 and be mounted in the torso assembly in triaxial configuration at T4, and as optional instrumentation in uniaxial for- and-aft oriented configuration on the most anterior ends of ribs #1 and #6 and at the spine box at the levels of #1 and #6 ribs as shown in 127–0000 sheet 3. (f) The chest deflection transducer shall have the dimensions and response characteristics specified in drawing SA572–S50 and be mounted in the upper torso assembly as shown in 127–0000 sheet 3. (g) The optional lumbar spine force-moment transducer shall have the dimensions, response characteristics, and sensitive axis locations specified in drawing SA572–S12 and be mounted in the lower torso assembly as shown in drawing 127–0000 sheet 3 as a replacement for lumbar adaptor 127–3005. (h) The optional iliac spine force transducers shall have the dimensions and response characteristics specified in drawing SA572–S13 and be mounted in the torso assembly as shown in drawing 127–0000 sheet 3 as a replacement for ASIS load cell 127–3015–1 (left) and −2 (right). (i) The optional pelvis accelerometers shall have the dimensions, response characteristics, and sensitive mass locations specified in drawing SA572–S4 and be mounted in the torso assembly in triaxial configuration in the pelvis bone as shown in drawing 127–0000 sheet 3. (j) The femur force transducer shall have the dimensions and response characteristics specified in drawing SA72–S10 and be mounted in the leg assembly as shown in drawing 127–0000 sheet 3. (k) The outputs of acceleration and force-sensing devices installed in the dummy and in the test apparatus specified by this part must be recorded in individual data channels that conform to SAE Recommended Practice J211, Rev. Mar95 “Instrumentation for lmpact Tests,” except that the lumbar measurements are based on CFC 600, with channel classes as follows: (1) Head acceleration—Class 1000. (2) Neck: (i) Forces—Class 1000; (ii) Moments—Class 600; (iii) Pendulum acceleration—Class 180; (iv) Rotation—Class 60 (if used). (3) Thorax: (i) Rib acceleration—Class 1000; (ii) Spine and pendulum accelerations—Class 180; (iii) Sternum deflection—Class 600. (4) Lumbar: (i) Forces—Class 1000; (ii) Moments—Class 600; (iii) Flexion—Class 60 if data channel is used. (5) Pelvis accelerations—Class 1000. (6) Femur forces—Class 600. (l) Coordinate signs for instrumentation polarity shall conform to the Sign Convention For Vehicle Crash Testing, Surface Vehicle Information Report, SAE J1733, 1994–12. (m) The mountings for sensing devices shall have no resonance frequency less than 3 times the frequency range of the applicable channel class. (n) Limb joints must be set at one G, barely restraining the weight of the limb when it is extended horizontally. The force needed to move a limb segment shall not exceed 2G throughout the range of limb motion. (o) Performance tests of the same component, segment, assembly, or fully assembled dummy shall be separated in time by period of not less than 30 minutes unless otherwise noted. (p) Surfaces of dummy components may not be painted except as specified in this subpart or in drawings subtended by this subpart. [65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47328, July 18, 2002] [65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47329, July 18, 2002; 67 FR 59023, Sept. 19, 2002]
Title 49: Transportation
PART 572—ANTHROPOMORPHIC TEST DEVICES
Subpart N—Six-year-old Child Test Dummy, Beta Version
§ 572.120 Incorporation by reference.
§ 572.121 General description.
Table A------------------------------------------------------------------------ Drawing Component assembly number------------------------------------------------------------------------Head assembly............................................... 127-1000Neck assembly............................................... 127-1015Upper torso assembly........................................ 127-2000Lower torso assembly........................................ 127-3000Leg assembly................................................ 127-4000Arm assembly................................................ 127-5000------------------------------------------------------------------------
§ 572.122 Head assembly and test procedure.
§ 572.123 Neck assembly and test procedure.
Table B---------------------------------------------------------------------------------------------------------------- Time Pendulum pulse---------------------------------------------------------------------------------------------------------------- Flexion Extension ms --------------------------------------------------- m/s ft/s m/s ft/s----------------------------------------------------------------------------------------------------------------10.......................................................... 1.2-1.6 3.9-5.3 1.0-1.4 3.3-4.620.......................................................... 2.4-3.4 7.9-11.2 2.2-3.0 7.2-9.830.......................................................... 3.8-5.0 12.5-16.4 3.2-4.2 10.5-13.8----------------------------------------------------------------------------------------------------------------
§ 572.124 Thorax assembly and test procedure.
§ 572.125 Upper and lower torso assemblies and torso flexion test procedure.
§ 572.126 Knees and knee impact test procedure.
§ 572.127 Test conditions and instrumentation.
Figures to Subpart N of Part 572
