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Fig. 11-26. Random Vibration. The plot shown on the left is an example of how acceleration from random vibration would vary overtime. The probability density curve (center), with the same vertical scale, describes the relative likelihood of acceleration being at a given value. This is a normal distribution, with each tick mark on the vertical scale representing a standard deviation, a. The figure on the right is a plot of power spectral density. It describes the frequency content of the vibration and Is equal to the mean-square acceleration (g2) in a selected frequency band divided by the width, in Hz, of that band.

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