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I have measured the torque and the speed of a shaft whenrunning at a variable speed. From the measurements, torque fluctuations are in the torque signals and I have the feeling that the fluctuations frequency is the shaft speed. I need to verify this with some signal statistics functions. In case the shaft speed would have been constant, I would have computed the PSD of the torque signal and I would have compared its peak frequency with the shaft speed. But what should I do with two non stationary signals?

Thanks

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# Frequency correlation between two non stationary signals

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