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.
    or  slope?  
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.
  flower  Hz
  fupper  Hz
  psdupper  g2/Hz
 psdlower  g2/Hz 
 OR
 slope dB/oct.
 
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.
Mean Square value =
 g2
Root Mean Square value =
 g