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Meaning of 'Mean frequency' using PSD moments

JBlackhole
16-Pearl

Meaning of 'Mean frequency' using PSD moments

To all

I am looking at the Dirlik calculation method for fatigue analysis/damage. The method is based on PSD moments and one of the variables is called the mean frequency (xm) (see below for definition). Does anyone know what this "mean frequency" is/represent?

PSDMoment_xm.PNG

Thanks

Regards

JXB

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