Establish the calibration baseline, correcting for any gravity
Establish the maximum (peak) acceleration magnitude.
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
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.
Construct the onset line defined by the straight line through
points 1 and 3.
Construct the offset line defined by the straight line through
points 2 and 4.
Construct a line parallel to the calibration baseline, through
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
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
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 energy-absorbing device, it represents
the load at which the device deforms in performing its function.
Navy - AS
(Project no. 1680-N495