Comparison of Predicted and Experimental Rotor Loads to Evaluate Flap‐Lag Coupling with Blade Pitch

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An analylical model far the prediction of rotor performance and structural loads has been developed to include time‐dependent variations in blade stiffness using a modal approach. Comparison of predicted rotor loads with wind tunnel rotor test results revealed the importance of using coupled modes and of choosing the most appropriate eoordinstc system to satisfy the hypothesis of time‐invariant mode shapes. The decision to employ modes that are either defined in hub or blade axis coordinates is discussed in relation to various rotor configurations. Further rotor load comparisons are presented for a distinctly different rotor using Lynx flight data. In this case, the inclusion of time‐varying structural coupling between flap and lag motions demonstrated an improved capabilily to predict the magnitude and phase of chordwise bending moments.

Document Type: Research Article


Affiliations: Westland Helicopters, Yeovil, Somerset, England

Publication date: October 1, 1979

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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    Authors can find submission guidelines and related information on the AHS website.

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