MIL-STD-810B Method 513.1 Acceleration & 514.1 Vibration Test Standard PDF (EN)

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;:._ . .,5 Downloaded from https://www.everyspec.com MILATD-81@ 15 June 1967 /- ) METHOD 513.1 ACCEI.FJUTION L =. - lhe accelerationtest is perfomed to determine if equipnent is conetruoted to withstand expecteds!teadystate atressca and to insure that performance degradationsor malfuuctlonewill not be prnduced by the eimulated Barvice acoelerationenvironmentother than gravity. Procadure I is the struc- tural test and Procedure II is the operational test. 2. Apparatus. - Eithar of tw facilities may be utilised for acceleration tests: a centrifuge,or a track and rocket sled facility.

A centrifuge of ade- quate size Is reccmmandedfor all structural smd most operationaltests because of the convaniermeand ease of control. However, the performanceof space oriented equlpnent,such as gyI’os,epace control platfonnc, etc., are difficult to test on a centrifuge,even when a counter-rotatingfixture is amployed. A rocket sled run is advantageousshare &trlctQ linear accelerationis required. 3. fiooeduree.- lhe tesk itsm ehall be subjected to both the structural and ,.- the operational teat, unless otherwise specifiad. 3.1 Mountl.n$! of test item.

- Direotion of forward accelerationie always con- sidered to be the direction of tha vehicle accelerationand equipment shall be oriented accordingly,wdmg its nermal mourrtl.mg means. For cemtrifuge8,the location of the test itcsn(withreference to the G level established for the test) shall normally be detenninadby a measurement from the rotatinhal centar of the cen- tri~e to the gemetric center of the test item.

Should w petit of the test itm nearest the center of tha cemtrii’ugeexperienceless than 90 percent Of the specified G level, the test itan shall be moved outward on a radius of the cen- trifuge or the speed of rotation shall be increased vntil not less than 90 percent of the specified G lavel ia obtained. Caution: If the furthest end Of the test item .xperiancesmore than 110 parcent of the desired G lavel at the geometric center (while the nearest and expariances90 percent or umdar), then the test . itan may be tested using a lower speed and a larger radius centrifuge am.

For large teat speclmame axceptiona should be made to allnw for maximum gradient baaad on the axisting availabilityof large oentrifugee in canmercial or Govarrnrmntt=t facilities. (-- 3.1.1 Teat itan orientation (centrifu ~ e . - When a centrifuge is used to attain the required accelerationlevele, the test itaceshall be oriented as follows: Fore: Front or forward end of tact itssnshell face toward center of cemtrifhge. Aft: Reveree item 180 d0gree8 from tha poaitien. up: Top of specimen shall face toward center of centrifuge. Down: Reverse item 180 degraes frrxothe %Pn ~sltien. Lateral: Each side (right, left) in turn shell fece toward canter of centrifuge. ,.. 513.1-1 ”.’ .

METHOD 513.1 ...... Xl Oct~ber 1969 .,. .

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.(~; .,> MILST&31ti-::”:; Downloaded from https://www.everyspec.com ,; 3,2 Test level determination,- lhe G level t+ be applied to the test itf?n ~ is contingent an two factors: ‘iledirection of forward accelerationlevel (A) of the vehicle, and the orientation of the test item within the vehicle. 15 June Where: A = me highest Pxsible known or unknohn forward acceleration of a vehicle in which equipnemt is to be mounted. (A) shall never be less than one G level. Instructions for selection of test levels for Frocedure I from table 513.l-I, end for Procedure II from table 513.1-11 are as follows: Forward Orientation accel.

of of test item vehicle in vehicle Test lavel Known hok Substitute known accelerationA in forward acceleration column of appropriate e vehicle category, and use given multiplying factors to attain test level for indicated directions. Known IJnkmwn Substitute known acceleration A IJ fortia?-d acceleration COIIUR.Iof appropriate catepr,y~ and use largest given multiplying factor to attain test level for all directions. unknown Gown Select most probable level from those given in forward acceleration column of appropriate category, and use given multiplying factors to attain test level for required direction.

Unknown UnknOwm Select most probable level from those given in forward acceleration column of appropriate ~.. category, and use largest given multiplying factor to attain test level for all directions. 3.3 Procadure I. Structural test. - The test it& shall be irmtallad on the acceleration apparatus in accordance with section 3, Ganaral Requir&nents, para- graph 3.2.2, by its normal mounting means. G level shall be determined in accordance with 3.2, and shall be applied while the test it= is nonoperating. 3.3.1 Performanceof test. - G level determined for the test shall be app~ed along at least three mutually perpendicular axes in two opposite directions along each axla.

The test time duration In each direction shall be at least 1 ud.nute followlng centrifuge stabi~iaation. Cm centrifuges, a test time of 1 minute I* usually aufficiant to detemine StruCtWd SOU@IeES (~Oper operation); howaver, the test time w be inbr&s6d. Test times for other apparatus will probablybe shorter, depending upon the type of apparatus. At the conclusion of the test, the test item shall be operated “ad the results compared with the data obtained in ac- cordance with section 3, Ganeral Requirements, paragraph 3.2.1. The test itea shall then be inspected as specified in section 3, General Requirements, paragraph 3.2.4. 3.4 Frocsdure II. Cmerational test.

- ‘lhetest itcm shall be installed on the accelerationapparatus in accordance with section 3, General Requirenanta, WWrar@ 3.2.2, by its ncmal mounting means. Ihe G level shall be detemined accordance with 3.2, and shall be applied while the test item is operating. in MX’IWOD513.1 20 October 1969 513.1-2 (

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