AREA UNDER LOG-LOG PSD GRAPH
The area under a psd-frequency graph is equal to the mean square value of the signal. This program calculates the mean square and root mean square (rms) value under a straight line log-log curve, i.e. when the slope is given in dB/octave.
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or
slope?
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Five input values are required:
- Whether the slope is positive or negative
- The lower frequency value in Hertz
- The upper frequency value in Hertz
- The upper power spectral density (psd) value in g2/Hz
- Either the lower psd value in g2/Hz
OR the slope of the line in decibels per octave.
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flower
Hz
fupper
Hz
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psdupper
g2/Hz
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psdlower
g2/Hz
OR
slope
dB/oct.
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Allowed frequency values: 0.001 to 9,999 Hz
Allowed psd values: 0.0001 to 1 g2/Hz
Allowed slope values: 1 to 10 dB/oct.
Results are given to 5 significant figures. Results over 100g rms are probably meaningless for most vibration testing scenarios and will not be displayed.
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Mean Square value =
g2
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Root Mean Square value =
g
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