[Code of Federal Regulations]
[Title 49, Volume 5]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR572.33]
[Page 783-787]
TITLE 49--TRANSPORTATION
OF TRANSPORTATION
PART 572--ANTHROPOMORPHIC TEST DEVICES--Table of Contents
Subpart E--Hybrid III Test Dummy
Sec. 572.33 Neck.
(a) The neck consists of the assembly shown in drawing 78051-90,
revision A and conforms to each of the drawings subtended therein.
(b) When the head and neck assembly (consisting of the parts 78051-
61X, revision C; -90, revision A; -84; -94; -98; -104, revision F; -303,
revision E; -305; -306; -307, revision X) which has a six axis neck
transducer (Drawing number C-1709, Revision D, titled ``Neck
transducer,'' dated February 1, 1993.) installed in conformance with
Sec. 572.36(d), is tested in accordance with paragraph (c) of this
section, it shall have the following characteristics:
(1) Flexion. (i) Plane D, referenced in Figure 20, shall rotate
between 64 degrees and 78 degrees, which shall occur between 57
milliseconds (ms) and 64 ms from time zero. In first rebound, the
rotation of Plane D shall cross 0 degrees between 113 ms and 128 ms.
(ii) The moment measured by the six axis neck transducer (drawing C-
1709, revision D) about the occipital condyles, referenced in Figure 20,
shall be calculated by the following formula: Moment (lbs-ft) = My-0.058
x Fx, where My is the moment measured in lbs-ft by the ``Y'' axis moment
sensor of the six axis neck transducer and Fx is the force measured in
lbs by the ``X'' axis force sensor (Channel Class 600) of the six axis
neck transducer. The moment shall have a maximum value between 65 lbs-ft
and 80 lbs-ft occurring between 47ms and 58 ms, and the positive moment
shall decay for the first time to 0 lb-ft between 97 ms and 107 ms.
(2) Extension. (i) Plane D, referenced in Figure 21, shall rotate
between 81 degrees and 106 degrees, which shall occur between 72 ms and
82 ms from time zero. In first rebound, rotation of Plane D shall cross
0 degrees between 147 ms and 174 ms.
(ii) The moment measured by the six axis neck transducer (drawing C-
1709, revision D) about the occipital condyles, referenced in Figure 21,
shall be calculated by the following formula: Moment (lbs-ft) = My-0.058
x Fx, where My is the moment measured in lbs-ft by the ``Y'' axis moment
sensor of the six axis neck transducer and Fx is the force measured in
lbs by the ``X'' axis force sensor (Channel Class 600) of the six axis
neck transducer. The moment shall have a maximum value between--39 lbs-
ft and -59 lbs-ft, occurring between 65 ms and 79 ms, and the negative
moment shall decay for the first time to 0 lb-ft between 120 ms and 148
ms.
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[GRAPHIC] [TIFF OMITTED] TR20MY97.000
[[Page 785]]
[GRAPHIC] [TIFF OMITTED] TR20MY97.001
(c) Test procedure. (1) Soak the test material in a test environment
at any temperature between 69 degrees F to 72 degrees F and at a
relative humidity from 10% to 70% for a period of at least four hours
prior to its application in a test.
(2) Torque the jamnut (78051-64) on the neck cable (78051-301,
revision E) to 1.0 lbs-ft .2 lbs-ft.
(3) Mount the head-neck assembly, defined in paragraph (b) of this
section, on a rigid pendulum as shown in Figure 22 so that the head's
midsagittal plane is vertical and coincides with the plane of motion of
the pendulum's longitudinal axis.
[[Page 786]]
[GRAPHIC] [TIFF OMITTED] TC01AU91.165
(4) Release the pendulum and allow it to fall freely from a height
such that the tangential velocity at the pendulum accelerometer
centerline at the instance of contact with the honeycomb is 23.0 ft/sec
0.4 ft/sec. for flexion testing and 19.9 ft/sec.
0.4 ft/sec. for extension testing. The pendulum
deceleration vs. time pulse for flexion testing shall conform to the
characteristics shown in Table A and the decaying deceleration-time
curve shall first cross 5g between 34 ms and 42 ms. The
pendulum deceleration vs. time pulse for extension testing shall conform
to the characteristics shown in Table B and the decaying deceleration-
time curve shall cross 5g between 38 ms and 46 ms.
[[Page 787]]
Table A--Flexion Pendulum Deceleration vs. Time Pulse
------------------------------------------------------------------------
Flexion
Time (ms) deceleration
level (g)
------------------------------------------------------------------------
10........................................................ 22.50-27.50
20........................................................ 17.60-22.60
30........................................................ 12.50-18.50
Any other time above 30 ms................................ 29 maximum.
------------------------------------------------------------------------
Table B--Extension Pendulum Deceleration vs. Time Pulse
------------------------------------------------------------------------
Extension
Time (ms) deceleration
level (g)
------------------------------------------------------------------------
10........................................................ 17.20-21.20
20........................................................ 14.00-19.00
30........................................................ 11.00-16.00
Any other time above 30 ms................................ 22 maximum.
------------------------------------------------------------------------
(5) Allow the neck to flex without impact of the head or neck with
any object during the test.
[51 FR 26701, July 25, 1986, as amended at 53 FR 8765, Mar. 17, 1988; 62
FR 27514, May 20, 1997]