
 MILS8551O(AS)
a.
Establish the calibration baseline, correcting for any gravity
bias acceleration,
Establish the maximum (peak) acceleration magnitude.
b.
c.
Construct a reference line parallel to the calibration baseline
at a magnitude equal to 10 percent of the peak acceleration. The
intersection of this line with the acceleration time plot defines
points 1 and 2.
Construct a second reference line parallel to the calibration
d.
baseline at a magnitude equal to 90 percent of the peak acceler
ation. The intersection of this line with the acceleration time
plot defines points 3 and 4.
e.
Construct the onset line defined by the straight line through
points 1 and 3.
Construct the offset line defined by the straight line through
f.
points 2 and 4.
Construct a line parallel to the calibration baseline, through
g.
the peak acceleration. The time interval defined by the inter
sections of this line with the constructed onset and offset lines
(points 5 and 6) is the plateau
h,
Locate the intersection of the constructed onset line with the
calibration baseline (point 7). The time interval defined by
points 7 and 5 is the rise time (TR).
For a given plot of accelerations in the x and y axes, the
i.

specific G values are graphically obtained from the constructed
onset and offset lines for the specific time at which the sum
mation vector "of acceleration is the greatest.
These are interchangeable names of devices
6.4.9 Load limiter; energy absorber.
used to limit the load on a structure to a preselected value. These devices absorb
energy by providing a resistive force applied over a deformation distance without
significant elastic rebound.
6.4.10 Limit load. In a structure, limit load refers to the load the structure
will carry before yielding. Similarly, in an energyabsorbing device, it represents
the load at which the device deforms in performing its function.
Preparing activity:
Navy  AS
(Project no. 1680N495
23

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