Downloaded from https://www.everyspec.com MIL-STD-8.1 OD 19 July ,1983 ... ,. O MSTHOD 513.3 ... , ... .. ACCELERATION . .. $...’.. . . SECTION 11 . ., ,. .:, ,.. .. ... . ., ., ,,, ,. Either a centrifuge of adequate size or a track/rocket-- powered sled arrangement may be used. A centrifuge is recommended for all Procedure I (Structural Test) and most of Procedure II (Operational Test)’ evaluations. A track/rocket-poweredsled.arrangement is recommended for , Procedure II..evaluations when strictly linear accelerations,are.requ:red. 11-1’”-. . 11-2 .~ . . II-2.1 The teat item shall be configured for service application.
The item should be visually inspected for evidence of mishandling and in-transit damage. Any damage observed must be noted on a pretest data sheet and may be cause for rejection of the item for test. Sufficient dimensional measurements of the item ehall be obtained to provide a reference guide for the evaluation of physical damage that may be induced during the tests. II-2.2 I@uotine of ths test ite m. The test item shall be mounted on the test aPParatus usins the hardware that is normally used to mount the item in its service installation. 0 II-2.2.1 “Centrifugemount-.
.Forcentrifuges, the location for the test item is normally determined by measurement from the center.of rotation of the centrifuge to the location on the centrifuge arm that will provide the g level established for the teat. The test item is mounted so that its geometric center is at the location on the arm determined for the g level. G levels may be calculated as follows. GL . Where: GL . K= R= g level to be applied 1.12 x 10-3 for metric calculation radial distance from the center of rotation to the mounting location on centrifuge arm in meters centrifuge arm revolutions per minute N= . The orientation of the test.item on the centrifuge for the six test directions is as follows: a. EQCQ:
Front or forward end of test item facing toward center of centrifuge. .. b. ~: Reverse item 180 degrees from fore position METHOD 513.3’ 513.3-11 19 July 1983