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Order in Rotating Fan with 7 blades

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Old   June 24, 2019, 10:28
Default Order in Rotating Fan with 7 blades
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Hi All

Does anyone have experience in the cooling fan order calculation which is based on the Acoustics topic.
I am wondering how to calculate the 7th order ,14th order , 30th order etc to identify the noise level in that order. Is it similar to the blade passing frequency ?
Thanks in advance !!
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