Investigation of Rotor Wake Turbulence Through Cyclostationary Spectral Analysis

Abstract

The present paper introduces cyclostationary spectral analysis as a new approach to analyze the turbulence\nvelocity measurements generated by a rotor. To apply this technique, a random signal should have periodic statistical\ncharacteristics and should be suitable for many rotating mechanical system as shown in recent studies. However,\nthis method has never been applied on rotor velocity measurements. Via a Wigner–Ville representation, the\ninstantaneous power spectra of the turbulence in the wakes and in between the wakes will be depicted and analyzed.\nThe usefulness of the technique applied to rotor-generated turbulence is that it can separate the spectrum of the\nturbulence in between the wakes from that in the wake with a much greater frequency resolution than conventional\nspectral analysis.