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Comprehensive multibody dynamics analysis for rotor aeromechanics predictions in descending flight

Published online by Cambridge University Press:  27 January 2016

J.-S. Park  and
S. N. Jung
J.-S. Park
Affiliation:
Department of Aerospace Information Engineering, Konkuk University, Seoul, South Korea
S. N. Jung*
Affiliation:
Department of Aerospace Information Engineering, Konkuk University, Seoul, South Korea
*
snjung@konkuk.ac.kr
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Abstract

This paper studies the rotor aeromechanics in descending flight using a nonlinear flexible multibody dynamic analysis code, DYMORE. A freewake model is included in DYMORE to improve the rotor wake modelling. The wind-tunnel test data of the Higher-harmonic Aeroacoustics Rotor Test (HART) II rotor, with and without higher harmonic pitch control (HHC), and the flight test data of the full-scale utility helicopter rotor in descent are used for the aeromechanics correlation at an advance ratio of 0·15. The blade-vortex interaction (BVI) airloads are reasonably predicted for both the HART II and utility helicopter rotors, although some BVI peaks are missed on the advancing sides for both the rotors. The flap deflections and elastic torsion deformations at the blade tip are fairly correlated against the measured data of the HART II rotor. The correlation of blade structural moments for both HART II and utility helicopter rotors are not as good as the lift predictions; however, a reasonable prediction is obtained for the utility helicopter rotor.

Type
Research Article
Information
The Aeronautical Journal , Volume 116 , Issue 1177 , March 2012 , pp. 229 - 249
Copyright
Copyright © Royal Aeronautical Society 2012 

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