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|  MIL-V-29592(AS)
FIGURE 2. Vibration test fixture.
TABLE II. Pressure surge test temperature
4.7.11.1 Sinusoidal excitation. For the following tests the vibration
Input accelerometer shall be mounted on the fixture close to the mounting
point of the valve. A second accelerometer shall be mounted directly on the
test Item for monitoring resonant frequencies. The acceleration, frequency,
and displacement shall be as shown on Figure 3.
4.7.11.1.1 Resonance search. Resonant frequencies of the automatic air
vent valve shall be determined along each axis by slowly sweeping through the
frequency range of 5 to 2000 HZ logarithmically. The applied vibration shall
be at reduced levels (0.5g) but with sufficient amplitude to excite the test
item. A resonant frequency shall be considered to be any natural frequency
with an amplification factor of 1.5 or greater of the output response relative
to the input level. The resonant frequencies shall be recorded.
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