U.S. DEPARTMENT OF TRANSPORTATION - SaferCar.gov

TP-P572-U-00
CHECK SHEET NO. U2 (Continued)
HEAD DROP TEST (S572.182)
__18 Record the room temperature and humidity on Table U2. Verify that the temperature and
relative humidity meets specification by indicating “Pass” or “Fail” in the far right column.
__19 Release the head assembly so that it falls freely to the impact surface.
__20 Collect the head acceleration data and filter using a Channel Class 1000 phaseless filter in
accordance with SAE J211.
__21 Time zero is defined as the time of contact between the head and the impact surface. All
channels should be at a zero level at this point.
__22 Plot the x, y, z and resultant acceleration curves.
__23 Record the peak head resultant acceleration and peak head X acceleration. Verify that
these accelerations lie within the specifications indicated in Table U2.
__24 Calculate 15% of the peak head resultant acceleration.
__25 Calculate the maximum oscillation that occurs after the peak resultant acceleration. Verify
that the maximum oscillation is less than 15% of the peak head resultant acceleration.
__26 Wait at least 2 hours between successive head certification tests on the same side of the
head.
Table U2. Head Drop Test
Tested Parameter Units Specification Result
Pass/
Fail
Head Assembly Soak Time Minutes ≥240
Temperature - Max C 20.6 to 22.2
During Soak Min
C
Humidity –
During Soak
Max % 10.0 to 70.0
Min %
Temperature – During test C 20.6 to 22.2
Humidity – During test % 10.0 to 70.0
Peak Head Resultant Acceleration g’s 125 to155
Peak Head X Acceleration g’s