= Order Analysis of a Vibration Signal in MATLAB documentation
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https://www.mathworks.com/help/signal/ug/order-analysis-of-a-vibration-signal.html
MathWorks worked example. Introduction explicitly identifies simulated helicopter accelerometer data. The RPM-order-map section describes constant-phase resampling and the distinction between rotational orders and ordinary frequencies; the later sections extract order amplitudes and waveforms. The example is a software demonstration, not an independently reported helicopter experiment.
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