[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: 49CFR572.77]

[Page 806-807]
 
                        TITLE 49--TRANSPORTATION
 
                            OF TRANSPORTATION
 
PART 572--ANTHROPOMORPHIC TEST DEVICES--Table of Contents
 
                       Subpart I--6-Year-Old Child
 
Sec. 572.77  Instrumentation.

    (a)(1) Test probe. For the head, thorax, and knee impact test, use a 
test probe that is rigid, of uniform density and weighs 10 pounds and 6 
ounces, with a diameter of 3 inches; a length of 13.8 inches; and an 
impacting end that has a rigid flat right face and edge radius of 0.5 
inches.
    (2) The head and thorax assembly may be instrumented either with a 
Type A or Type B accelerometer.
    (i) Type A accelerometer is defined in drawing SA 572 S1.
    (ii) Type B accelerometer is defined in drawing SA 572 S2.
    (b) Head accelerometers. (1) Install accelerometers in the head as 
shown in drawing SA 106C 001 sheet 1 using suitable spacers or adaptors 
as needed to affix them to the horizontal transverse bulkhead so that 
the sensitive axes of the three accelerometers intersect at the point in 
the midsagittal plane located 0.4 inches below the intersection of a 
line connecting the longitudinal center lines of the roll pins in either 
side of the dummy's head with the head's midsagittal plane.
    (2) The head has three orthogonally mounted accelerometers aligned 
as follows:
    (i) Align one accelerometer so that its sensitive axis is 
perpendicular to the horizontal bulkhead in the midsagittal plane.
    (ii) Align the second accelerometer so that its sensitive axis is 
parallel to the horizontal bulkhead, and perpendicular to the 
midsagittal plane.
    (iii) Align the third accelerometer so that its sensitive axis is 
parallel to the horizontal bulkhead in the midsagittal plane.
    (iv) The seismic mass center for any of these accelerometers may be 
at any distance up to 0.4 inches from the axial intersection point.
    (c) Thoracic accelerometers. (1) Install accelerometers in the 
thoracic assembly as shown in drawing SA 106C 001, sheet 1, using 
suitable spacers and adaptors to affix them to the frontal surface of 
the spine assembly so that the sensitive axes of the three 
accelerometers intersect at a point in the midsagittal plane located 
0.95 inches posterior of the spine mounting surface, and 0.55 inches 
below the horizontal centerline of the two upper accelerometer mount 
attachment hole centers.
    (2) The sternum-thoracic assembly has three orthogonally mounted 
accelerometers aligned as follows:
    (i) Align one accelerometer so that its sensitive axis is parallel 
to the attachment surface in the midsagittal plane.
    (ii) Align the second accelerometer so that its sensitive axis is 
parallel to the attachment surface, and perpendicular to the midsagittal 
plane.
    (iii) Align the third accelerometer so that its sensitive axis is 
perpendicular to the attachment surface in the midsagittal plane.
    (iv) The seismic mass center for any of these accelerometers may be 
at any distance up to 0.4 inches of the axial intersection point.
    (d) Femur-sensing device. Install a force-sensing device SA 572-S10 
axially in each femur shaft as shown in drawing SA 106C 072 and secure 
it to the femur assembly so that the distance measured between the 
center lines of two attachment bolts is 3.00 inches.
    (e) Limb joints. Set the limb joints at lg, barely restraining the 
limb's weight when the limb is extended horizontally, and ensure that 
the force required to move the limb segment does not exceed 2g 
throughout the limb's range of motion.
    (f) Recording outputs. Record the outputs of acceleration and force-
sensing devices installed in the dummy and in the test apparatus 
specified in this

[[Page 807]]

part, in individual channels that conform to the requirements of SAE 
Recommended Practice J211, October 1988, with channel classes as set out 
in the following table C.

                                 Table C
------------------------------------------------------------------------
                  Device                               Channel
------------------------------------------------------------------------
Head acceleration.........................  Class 1000
Pendulum acceleration.....................  Class 60
Thorax acceleration.......................  Class 180
Femur-force...............................  Class 600
------------------------------------------------------------------------

    The mountings for sensing devices shall have no resonance frequency 
within a range of 3 times the frequency range of the applicable channel 
class.