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Optimal Trailing Edge Flap Positions of Helicopter Rotor for Various Thrust Coefficients to Solidity (Ct/σ) Ratios

Authors: Saijal K. K., K. Prabhakaran Nair


This study aims to determine change in optimal locations of dual trailing-edge flaps for various thrust coefficient to solidity (Ct /σ) ratios of helicopter to achieve minimum hub vibration levels, with low penalty in terms of required trailing-edge flap control power. Polynomial response functions are used to approximate hub vibration and flap power objective functions. Single objective and multiobjective optimization is carried with the objective of minimizing hub vibration and flap power. The optimization result shows that the inboard flap location at low Ct /σ ratio move farther from the baseline value and at high Ct /σ ratio move towards the root of the blade for minimizing hub vibration.

Keywords: Helicopter rotor, Trailing-edge flap, Thrust coefficient to solidity (Ct /σ) ratio, Optimization.

Digital Object Identifier (DOI):

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[1] P.P. Friedmann, The Renaissance of Aeroelasticity and its Future, Vol 37, pp.105-121, Journal of Aircraft, 1999.
[2] R. Loewy, Helicopter Vibrations: A Technological Perspective, 43(4), pp.4-30, Journal of American Helicopter Society, 1984.
[3] K. Nguyen and I. Chopra, Application of Higher Harmonic Control to Rotors Operating at High Speed and Maneuvering Flight, 35, pp.78-89, Journal of American Helicopter Society, 1990.
[4] C.E. Hammond, Wind Tunnel Results Showing Rotor Vibratory Loads Reduction Using Higher Harmonic Blade Pitch, 28, pp.9-15, Journal of American Helicopter Society, 1983.
[5] K.F. Guinn, Individual Blade Control Independent of a Swashplate, 25-31, Journal of American Helicopter Society, 1982.
[6] N.D. Ham, A Simple System for Helicopter Individual Blade Control Using Modal Decomposition, Vol 4, pp.23-28, Vertica, 1980.
[7] J. Milgram, I. Chopra and F.K. Straub, Rotors with Trailing Edge Flap: Analysis and Comparison with Experimental Data, 43(4), pp.319-332, Journal of American Helicopter Society, 1998.
[8] P.P. Friedmann, M. De Terlizzi and T.F. Myrtle, New Developments in Vibration Reduction with Actively Controlled Trailing Edge Flaps, 33(10–11), pp.1055-1083, Math. Comput. Model., 2001.
[9] M.V. Fulton and R.A. Ormiston, Hover Testing of a Small Scale Rotor with On-blade Elevons, 46(2), pp.96-106, Journal of American Helicopter Society, 2001.
[10] N. Koratkar and I. Chopra, Closed-loop wind tunnel testing of a smart rotor model with trailing edge flaps, 47(4), pp.263-272, Journal of American Helicopter Society, 2002.
[11] S.R. Viswamurthy and R. Ganguli, An Optimization Approach to Vibra- tion Reduction in Helicopter Rotors with Multiple Active Trailing Edge Flaps, 8(3), pp.185-194, Aerosp. Sci. Technol., 2004.
[12] J.S. Kim, E.C. Smith and K.W. Wang, Helicopter Vibration Suppression via Multiple Trailing Edge Flaps Controlled by Resonance Actuation System, pp.7-10, Paper presented at the American Helicopter Society 60th Annual Forum, Baltimore, Maryland, USA, 2004.
[13] H. Agarwal and J.E. Renaud, Reliability Based Design Optimization Using Response Surfaces in Application to Multidisciplinary Systems, 36(3), pp.291-311, Engineering Optimization, 2004.
[14] S. Venkataraman, Reliability Optimization Using Probabilistic Sufficiency Factor and Correction Response Surface, 38(6), pp.671-685, Engineering Optimization, 2006.
[15] R. Jin, W. Chen and T.W. Simpson, Comparative Studies of Meta- modelling Techniques under Multiple Modelling Criteria, 23(1), pp.1-13, Structural Multidisciplinary Optimization, 2001.
[16] R. Ganguli, Optimum Design of a Helicopter Rotor for Low Vibration Using Aeroelastic Analysis and Response Surface Methods, 258(2), pp.327-344, Journal of Sound and Vibration, 2002.
[17] S.R. Viswamurthy and R. Ganguli, Optimal Placement of Trailing- edge flaps for Helicopter Vibration Reduction Using Response Surface Methods, Vol.39, No.2, pp.185-202, Engineering Optimization, 2007.
[18] K.K. Saijal, R. Ganguli and S.R. Viswamurthy, Optimization of Heli- copter Rotor Using Polynomial and Neural Network Metamodels, Vol.48, No.2, pp.553-566, Journal of Aircraft, 2.