[Code of Federal Regulations]
[Title 49, Volume 6]
[Revised as of October 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR572.7]

[Page 898-899]
 
                        TITLE 49--TRANSPORTATION
 
                   CHAPTER V--NATIONAL HIGHWAY TRAFFIC
                    SAFETY ADMINISTRATION, DEPARTMENT
                            OF TRANSPORTATION
 
PART 572_ANTHROPOMORPHIC TEST DEVICES--Table of Contents
 
                     Subpart B_50th Percentile Male
 
Sec.  572.7  Neck.

    (a) The neck consists of the assembly shown as number SA 150 M020 in 
Figure 1 and conforms to each of the drawings subtended by number SA 150 
M020.
    (b) When the neck is tested with the head in accordance with 
paragraph (c) of this section, the head shall rotate in reference to the 
pendulum's longitudinal centerline a total of 68[deg] 5[deg] about its center of gravity, rotating to the 
extent specified in the following table at each indicated point in time, 
measured from impact, with a chordal displacement measured at its center 
of gravity that is within the limits specified. The chordal displacement 
at time T is defined as the straight line distance between (1) the 
position relative to the pendulum arm of the head center of gravity at 
time zero, and (2) the position relative to the pendulum arm of the head 
center of gravity at time T as illustrated by Figure 3. The peak 
resultant acceleration recorded at the location of the accelerometers 
mounted in the head form in accordance with Sec.  572.11(b) shall not 
exceed 26g. The pendulum shall not reverse direction until the head's 
center of gravity returns to the original zero time position relative to 
the pendulum arm.

----------------------------------------------------------------------------------------------------------------
                                                                                            Chordal Displacement
                       Rotation (degrees)                         Time (ms) (2+.08T)      minus0.5)
----------------------------------------------------------------------------------------------------------------
0...............................................................                   0                     0.0
30..............................................................                  30                     2.6
60..............................................................                  46                     4.8
Maximum.........................................................                  60                     5.5
60..............................................................                  75                     4.8
30..............................................................                  95                     2.6
0...............................................................                 112                     0.0
----------------------------------------------------------------------------------------------------------------

    (c) Test procedure: (1) Mount the head and neck on a rigid pendulum 
as specified in Figure 4, so that the head's midsagittal plane is 
vertical and coincides with the plane of motion of the pendulum's 
longitudinal centerline. Mount the neck directly to the pendulum as 
shown in Figure 4.
    (2) Release the pendulum and allow it to fall freely from a height 
such that the velocity at impact is 23.5 2.0 feet 
per second (fps), measured at the center of the accelerometer specified 
in Figure 4.
    (3) Decelerate the pendulum to a stop with an acceleration-time 
pulse described as follows:
    (i) Establish 5g and 20g levels on the a-t curve.
    (ii) Establish t1 at the point where the rising a-t curve 
first crosses the 5g level, t2 at the point where the rising 
a-t curve first crosses the 20g level, t2 at the point where 
the decaying a-t curve last crosses the 20g level, and t4 at 
the

[[Page 899]]

point where the decaying a-t curve first crosses the 5g level.
    (iii) t2-t1 shall be not more than 3 
milliseconds.
    (iv) t3-t2 shall be not less than 25 
milliseconds and not more than 30 milliseconds.
    (v) t4-t3 shall be not more than 10 
milliseconds.
    (vi) The average deceleration between t2 and 
t3 shall be not less than 20g and not more than 24g.
    (4) Allow the neck to flex without impact of the head or neck with 
any object other than the pendulum arm.

[38 FR 20451, Aug. 1, 1973, as amended at 42 FR 7152, Feb. 7, 1977; 42 
FR 12176, Mar. 3, 1977; 45 FR 40596, June 16, 1980]