rms
Purpose
Computes the RMS response of the given frequency response function xf or auto-spectra a to a unity white noise input over the frequency range w.
Syntax
rm = rms(t,w)
rm = rms(a,w,1)
Description
The presence of a third input argument indicates that an auto-spectrum a is used (instead of frequency response function xf).
A trapezoidal integration is used to estimate the root mean squared response
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rms =
( |
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ó
õ |
 2 |
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| 1 |
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| t() |2 d)1/2 =
( |
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ó
õ |
| 2 |
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| 1 |
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a() d)1/2
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If xf is a matrix containing several column FRF, the output is
a row with the RMS response for each column.
Warning
If only positive frequencies are used in w, the results are multiplied by 2 to account for negative frequencies.
See also
ii_cost
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