MIL-DTL-48554B
TABLE I. Shock orientation and impulse.
Orientation
Shock impulse and direction
Number of impulses
Longitudinal
-50 g's, +50 g's
15 each direction
Vertical
+100 g's
15 total
Transverse
-100 g's, +100 g's
15 each direction
FIGURE 1. Orientation of shock loads.
3.3.4 Vibration "A". The telescope shall withstand a total of 270 minutes of sweep-
cycle vibration. The vibration shall be applied for 90 minutes along each of the three
mutually perpendicular major axes shown in Figure 1. A complete sweep-cycle shall
consist of vibration from origin (5 Hz at 1 inch double amplitude) to mid-point (5 ± 0.5 g's
at 500 Hz) to origin, and shall have a duration of 15 ± 1 minutes. Double amplitude shall
be constant at 1 inch between 5 Hz and 10 Hz, and varied with frequency to maintain a
constant 5 ± 0.5 g's acceleration between 10 Hz and 500 Hz. Upon completion of
vibration, the telescope shall exhibit no evidence of damage or physical failure and shall
meet the requirements of 3.4 through 3.19 inclusive.
3.3.5 Vibration "B". The telescope shall be vibrated in the vertical plane shown in
Figure 1 for a total of 15 ± 1 minutes of sweep cycle vibration. A complete sweep-cycle
shall consist of vibration from origin (5 Hz at 1 inch double amplitude) to mid-point (5 ±
0.5 g's at 500 Hz) to origin, and shall have a duration of 15 ± 1 minute. Double amplitude
shall be constant at 1 inch between 5 Hz and 10 Hz and varied with frequency to maintain a
constant 5 ± 0.5 g's acceleration between 10 Hz and 500 Hz. Upon completion of
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