Random Vibration

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Random Vibration

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. </dd>
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 (g2 per cycle per second), sometimes called acceleration density or acceleration spectral density. [[/a>|/a> ]]


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use