Downloaded from https://www.everyspec.com /“-- MIL-STD-810D 19,. July’19@3.” METHOD 519.3 :..$ .!, . ,. GUNFIRE VIBRATION, AIRCRAFT . ., ,,: SECTION’II .. ... . .,. . .... ,:,, ., .,, 11-1 ~.. A random vibration source of sufficient the required teit~ capability to perform II-1.,1 l?~Q. The test item shall be installed-in a vibration fixture which simulates the’actual application configuration. To the extent practicalj the vibration teat setup ‘shouldincorporate aotual mounting and isolation provisions from the carrying aircraft.
Fixture designs which utilize the maximum amount of platform structure possible will allow the test item to respond to the laboratory excitation in a manner more closely related to the actual field environment. ,, IX-1.2 —G@@2La. The accuracy of the instrumentation for the gunfire vibration test shall be as specified in method.514.3 of MIL-STD-810D for random vibration. For the broadband random method, the test tolerances will be as follows: at fl, f2, f3, and f4 36 dB, and at frequencies above 400 Hz 36 dB.
If the controller used to shape the vibration spectra does not have sufficient capability to produce the required test spectrum shape, the produced spectrum shall envelope the required spectrum. II-2 ~ Step 1. The test item shall be prepared in Requirementa. accordance with section 4, General practices for accelerometer mou~ting, output averaging, and data a~alysi~ techniques outlined in method 514.3 of MIL-STD-81OD. Steo 2. Mount accelerometers followinR the 11-3 EEOCUUM Step 1. Mount test items on vibration shaker. Stap 2. Operate the test items in accordance with equipment specifications. Steu 3. Begin vibration exposure to the required test levels and spectra per paragraph 1~3.3. Step 4.
Operate the test equipment specifications. paragraph I-3.2. item during vibration exposure in accordance with Duration of vibration exposure shall be per Step 5. Operate the test ~ items in accordance with equipment specifications. Step 6. Rotate test item to an axis perpendicular to just-completed teet. Step 7. Repeat steps 1 through 5. METHOD 519..3 19.July 1983 519.3-17