Title 49
SECTION 572.146
572.146 Test conditions and instrumentation.
§ 572.146 Test conditions and instrumentation.(a) The test probe for thoracic impacts, except for attachments, shall be of rigid metallic construction and concentric about its longitudinal axis. Any attachments to the impactor such as suspension hardware, and impact vanes, must meet the requirements of § 572.144(c)(7) of this part. The impactor shall have a mass of 1.70 ±0.02 kg (3.75 ±0.05 lb) and a minimum mass moment of inertia 164 kg-cm 2 (0.145 lb-in-sec 2) in yaw and pitch about the CG of the probe. One-third ( 1/3) 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 test probe. The impacting end of the probe, perpendicular to and concentric with the longitudinal axis of the probe, has a flat, continuous, and non-deformable 50.8 ±0.25 mm (2.00 ±0.01 inch) diameter face with an edge radius of 7.6/12.7 mm (0.3/0.5 in). The impactor shall have a 53.3 mm (2.1 in) dia. cylindrical surface extending for a minimum of 25.4 mm (1.0 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 has a free air resonant frequency not less than 1000 Hz limited to the direction of the longitudinal axis of the impactor.
(b) Head accelerometers shall have the dimensions, response characteristics, and sensitive mass locations specified in drawing SA 572-S4 and be mounted in the head as shown in drawing 210-0000.
(c) The neck force-moment transducer shall have the dimensions, response characteristics, and sensitive axis locations specified in drawing SA 572-S19 and be mounted at the upper neck transducer location as shown in drawing 210-0000. A lower neck transducer as specified in drawing SA 572-S19 is allowed to be mounted as optional instrumentation in place of part No. ATD6204, as shown in drawing 210-0000.
(d) The shoulder force transducers shall have the dimensions and response characteristics specified in drawing SA 572-S21 and be allowed to be mounted as optional instrumentation in place of part No. 210-3800 in the torso assembly as shown in drawing 210-0000.
(e) The thorax accelerometers shall have the dimensions, response characteristics, and sensitive mass locations specified in drawing SA 572-S4 and be mounted in the torso assembly in triaxial configuration at the T4 location, as shown in drawing 210-0000. Triaxial accelerometers may be mounted as optional instrumentation at T1, and T12, and in uniaxial configuration on the sternum at the midpoint level of ribs No. 1 and No. 3 and on the spine coinciding with the midpoint level of No. 3 rib, as shown in drawing 210-0000. If used, the accelerometers must conform to SA-572-S4.
(f) The chest deflection potentiometer shall have the dimensions and response characteristics specified in drawing SA-572-S50 and be mounted in the torso assembly as shown drawing 210-0000.
(g) The lumbar spine force/moment transducer may be mounted in the torso assembly as shown in drawing 210-0000 as optional instrumentation in place of part No. 210-4150. If used, the transducer shall have the dimensions and response characteristics specified in drawing SA-572-S20.
(h) The pubic force transducer may be mounted in the torso assembly as shown in drawing 210-0000 as optional instrumentation in place of part No. 921-0022-036. If used, the transducer shall have the dimensions and response characteristics specified in drawing SA-572-S18.
(i) The acetabulum force transducers may be mounted in the torso assembly as shown in drawing 210-0000 as optional instrumentation in place of part No. 210-4522. If used, the transducer shall have the dimensions and response characteristics specified in drawing SA-572-S22.
(j) The anterior-superior iliac spine transducers may be mounted in the torso assembly as shown in drawing 210-0000 as optional instrumentation in place of part No. 210-4540-1, -2. If used, the transducers shall have the dimensions and response characteristics specified in drawing SA-572-S17.
(k) The pelvis accelerometers may be mounted in the pelvis in triaxial configuration as shown in drawing 210-0000 as optional instrumentation. If used, the accelerometers shall have the dimensions and response characteristics specified in drawing SA-572-S4.
(l) The outputs of acceleration and force-sensing devices installed in the dummy and in the test apparatus specified by this part shall be recorded in individual data channels that conform to the requirements of SAE Recommended Practice J211/1, Rev. Mar 95 “Instrumentation for Impact Tests - Part 1-Electronic Instrumentation” (refer to § 572.140(a)(3)), with channel classes as follows:
(1) Head acceleration - Class 1000
(2) Neck
(i) Force - Class 1000
(ii) Moments - Class 600
(iii) Pendulum acceleration - Class 180
(iv) Rotation potentiometer response (if used) - CFC 60.
(3) Thorax:
(i) Rib/sternum acceleration - Class 1000
(ii) Spine and pendulum accelerations - Class 180
(iii) Sternum deflection - Class 600
(iv) Shoulder force - Class 180
(4) Lumbar:
(i) Forces - Class 1000
(ii) Moments - Class 600
(iii) Torso flexion pulling force - Class 60 if data channel is used
(5) Pelvis
(i) Accelerations - Class 1000
(ii) Acetabulum, pubic symphysis - Class 1000,
(iii) Iliac wing forces - Class 180
(m) Coordinate signs for instrumentation polarity shall conform to the Sign Convention For Vehicle Crash Testing, Surface Vehicle Information Report, SAE J1733, 1994-12 (refer to § 572.140(a)(4)).
(n) The mountings for sensing devices shall have no resonance frequency less than 3 times the frequency range of the applicable channel class.
(o) Limb joints shall be set at lG, barely restraining the weight of the limbs when they are extended horizontally. The force required to move a limb segment shall not exceed 2G throughout the range of limb motion.
(p) Performance tests of the same component, segment, assembly, or fully assembled dummy shall be separated in time by a period of not less than 30 minutes unless otherwise noted.
(q) Surfaces of dummy components are not painted except as specified in this part or in drawings subtended by this part.