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Fan noise (Blade-passage Frequency)

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Old   November 9, 2004, 01:19
Default Fan noise (Blade-passage Frequency)
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I have a fan noise problem.

What does the blade-passage frequency (BPF) mean?

Could I get some reference materials (Books or papers)??

Thanks a lot.

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Old   November 9, 2004, 04:39
Default Re: Fan noise (Blade-passage Frequency)
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BPF means the frequency at which would see the blades of a rotor pass if you look at it but are not moving with the rotor (for instance observing from an adjacent stator).

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