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In wind turbine, Is the number of revolution taken in 1s is called 1P frequency? If not, is it possible to find the 1P rpm from rpm measured for 1 hour (that is, I have 60 rpm data points from tachometer)?

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  • $\begingroup$ You are mixing up your units. RPM per hour makes no sense. Do you mean revolutions per hour? Edit required. $\endgroup$ – Transistor Jul 7 '18 at 18:00
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    $\begingroup$ I meant I have measured rpm every minute for an hour. That is, I have 60 rpm data points $\endgroup$ – Selva Jul 7 '18 at 18:15
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The constant rotational speed is the first excitation frequency, mostly referred to as 1P. The second excitation frequency is the rotor blade passing frequency: NbP in which Nb is the number of rotor blades: 2P for a turbine equipped with two rotor blades, 3P for a three bladed rotor.

source: https://ocw.tudelft.nl/wp-content/uploads/Soft_soft___Berlijn_2002.pdf

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In wind turbine, is the number of revolution taken in 1 s is called 1P frequency?

According to Dynamics of offshore wind turbines supported on two foundations you are correct.

If not, is it possible to find the 1P rpm from rpm measured for 1 hour (that is, I have 60 rpm data points from tachometer)?

Average the RPM readings and divide by 60 (seconds in one minute).

Disclaimer: I looked up the first part. I am an EE but never heard of 1P before.

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