Abstract
Two basic classifications of vibration as found on land, sea, air and space vehicles are discussed: (1) sinusoidal, one-frequency-at-a-time vibration that seldom exists outside the laboratory; and (2) random, relatively broad-frequency-spectrum vibration commonly found in actual service.
Designers who need experimental verification of dynamic properties generally specify sinusoidal vibration forcing. The results of such tests are often used for design improvement. However, reliability specialists should insist that field environments be simulated as closely as is practical; this requires random vibration forcing, which is far more difficult to specify and far more expensive to accomplish.
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Abbreviations
- A :
-
peak value of acceleration
- a :
-
instantaneous value of acceleration
- D :
-
peak-to-peak value of displacement
- f :
-
frequency
- f N :
-
natural frequency
- K :
-
spring stiffness
- M :
-
mass
- Q :
-
maximum value of transmissibility
- T :
-
transmissibility ratio
- W :
-
weight
- X :
-
peak value of displacement
- x :
-
instantaneous value of displacement
- \(\ddot x\) :
-
instantaneous value of acceleration
- Z :
-
mechanical impedance
- π:
-
pi
- σ:
-
sigma
- sin:
-
sine of angle
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Tustin, W. Basic considerations for simulation of vibration environments. Experimental Mechanics 13, 390–396 (1973). https://doi.org/10.1007/BF02324043
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DOI: https://doi.org/10.1007/BF02324043