

VIBRATIONVibration testing determines the dynamic effects on component part of vibration within the frequency ranges and magnitudes that may be encountered during field service. Vibration, for example, causes loosening of parts or relative motion between parts in the specimen, producing objectionable operating characteristics, noise, wear, and physical distortion, and often results in fatigue and failure of mechanical parts.
Vibration testing is classified into four main categories, as follows: GUNFIREThis test verifies that material can physically and functionally withstand the relatively infrequent, repetitive sustained vibration encountered in operational environments during the firing of various armaments. RANDOMThis test is characterized by irregular nonrepeating patterns and amplitude, versus time. Random vibration more closely simulates the dynamic conditions in the real world than sinusoidal vibration. SINUSOIDALThis test is characterized by vibration amplitudes which vary sinusoidally with time such as generated by rotating machinery. MIXED MODEVibrations are produced simultaneously, to simulate environments where combinations of the above are present, in the actual environment. Mixed mode vibration has been shown to more often simulate the real world environment than either sine or random vibration separately. Vibration testing is specified in the following: MILPRF27, MILT27, MILSTD1671, MILSTD202, MILJ641, MILSTD750, MILSTD810, MILSTD1621, MILSTD3885, MILE5272, MILE5400, MILT5422, MILT7743, MILF7872, MILT7928, MILM7969, MILA8064, MILK8144, MILE8189, MILR8236, MILC8384, MILF8615, MILS8805, MILV8813, MILA8870, MILM10304, MILC11015, MILR11050, MILR11539, MILC11693, MILC12889, MILR12934, MILC13486, MILF13926, MILC14409, MILR15109, MILC15240, MILC15305, MILF15733, MILP15736, MILS15743, MILS16036, MILF16377, MILE16400, MILV16556, MILR16999, MILT17113, MILT17185, MILM17185, MILT17275, MILT17293, MILV17361, MILV17456, MILV17547, MILV17639, MILP17840, MILV17840, MILP17869, MILV18110, MILF18327, MILT18404, MILP18472, MILH18766, MILI18997, MILF19004, MILM19097, MILE19100, MILN19900, MILR19648, MILM19160, MILI20037, MILS20708, MILC21097, MILT21200, MILD21625, MILV22052, MILV22133, MILC22317, MILS22432, MILC22437, MILH22594, MILV22687, MILD22706, MILR22732, MILS22885, MILA22895, MILB23071, MILA23836, MILL23886, MILP23928, MILE24091, MILE24142, MILL24223, MILP24423, MILV24509, MILT28800, MILE39029, MILH83511, MILS008834, MILT0014358, UL213, UL886, UL1474, US COAST GUARD NO. 493, ISO10055, ISO/FDIS 15540, ISO15541, RTCA/DO160, NAVMAT P9492, GR487CORE, ASTM E64491, ASTM F138799, ASTM D99968, IEC 6826, ISTA, MILT0014358, MILS008834, SCL7695, SCL7722 VIBRATION/ACOUSTIC/TEMPERATUREThe vibration/acoustic/temperature procedure is performed to determine the combined effects of vibration, acoustic noise, and temperature. A typical example of items tested are aircraft equipment such as externally carried stores. Vibration/acoustic/temperature testing is specified in the following:




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