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http://dx.doi.org/10.5139/JKSAS.2013.41.6.440

Vibratory Loads Reduction of a Rotor in Slow Descent using Higher Harmonic Control Technology  

You, Younghyun (Department of Aerospace Information Engineering, Konkuk University)
Jung, Sung Nam (Department of Aerospace Information Engineering, Konkuk University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.41, no.6, 2013 , pp. 440-447 More about this Journal
Abstract
In this paper, a higher harmonic control (HHC) methodology is applied to find the optimum input scenario for the vibratory hub loads reduction. A comprehensive aeroelastic analysis code, CAMRAD II, is used to model the HART (Higher-harmonic-control Aeroacoustic Rotor Test) II rotor, and parametric study is conducted for the best HHC inputs leading to a minimum vibration (MV) condition. The resulting outcomes are compared with the earlier HART II test results. It is indicated that the control input adopted in the MV condition showed less satisfactory results. The new MV condition obtained in the present investigation can achieve 45% lower vibration level than the baseline uncontrolled condition. The optimum HHC input results lead to 3/rev harmonic input having $0.8^{\circ}$ amplitude and $350^{\circ}$ phase angle. About 5% reduction in the required power is possible but accompanies with the increase of vibration level.
Keywords
Higher Harmonic Control; HART II; Hub Vibratory Loads; Vibration Index; Minimum Vibration;
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