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|  MIL-V-82440 (OS)
4.4.4.2
Vibration, ready condition.
The valve, in the ready condi-
tion, shall be mounted in a manner equivalent to that shown in Figure 1.
The resonant modes in each of the 3 axes shall be determined by varying
the frequency of applied vibration slowly from 5 cps to 500 cps. The
valve shall then be subjected to resonance and cycling vibration in each
axis, in conformance with the times shown in Table V. If more than 4
resonances are encountered on any axis, the 4 most severe resonances shall
be chosen for the test. The resonant and cycling period, for each axis,
shall be divided into 3 equal parts, which are conducted at -45 F 5 F,
room temperature and +140 F 5 F respectively. For cycling, a logarithmic
frequency sweep rate shall be used if available; otherwise, other cycling
rates of frequency change may be used. The sweep rate shall be such that
15 minutes actual vibration time is required to proceed from the lower to
higher and back to the lower extremity of frequency range in accordance with
the accelerations of double amplitudes defined in Table VI.
TABLE V
VIBRATION TEST SCHEDULE
1
4
2
3
Number of Resonances O
Total Vibration Time
.
1 hr 1-1/2 hr
at Resonance *
30 min
2 hr
1 hr
Cycling Time
3 hr 2-1/2 hr 2 hr 1-1/2 hr
* 30 minutes each resonance
TABLE VI
VIBRATION SCHEDULE
Frequency (cps)
40-74
74-500
22-40
5-22
Double Amplitude
0.036
(in. 10%) Minimum 0.2
Acceleration
10 ;
3
(g's 10%) Minimum
4.4.4.3
Acceleration, ready condition. The valve, in the ready condi-
tion, shall be subjected to the accelerations defined in Table VII after
being secured to an acceleration equipment (see Figure 1). Acceleration
shall be measured at the approximate geometric center of the valve.
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