Random Vibration
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Random Vibration
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An oscillation whose instantaneous magnitude is not specified for any given instant
of time. The instantaneous magnitudes of a random oscillation are specified
only by probability distribution functions giving the fraction of the total
time that the magnitude, or some sequence of magnitudes, lies within a specified
range.
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A random vibration whose instantaneous magnitudes occur according to
the Gaussian distribution is called Gaussian
random vibration. Wide-band vibration amplitude is usually expressed as root-mean-square
acceleration in gravitational units of acceleration g. The parameter used
to specify the frequency distribution of a random vibration is power spectral
density (g^{2} per cycle per second), sometimes called acceleration
density or acceleration spectral density. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use