Loads transfer principles of coaxial helicopter rotors

Han, D. and Barakos, G. N. (2023) Loads transfer principles of coaxial helicopter rotors. Journal of the American Helicopter Society, 68(1), 012008. (doi: 10.4050/JAHS.68.012008)

Abstract

The load transfer principles of coaxial rotors are analyzed from a theoretical point of view. The theoretical expressions of hub forces and moments are derived by summing the Fourier series of the root forces and moments from all the blades of a coaxial rotor system with the assumption that the rotor loads are identical between the two rotors. The analytical relations indicate that changing the rotor-to-rotor phase angle may be used to reduce (and even eliminate) the magnitudes of specific harmonics of rotor thrust, drag, and pitching moment, but the reduction is accompanied by an increase in the magnitudes of rotor side force, rolling moment, and torque for the same harmonic and vice versa.

• Item Type: Articles
• Additional Information: This work was supported by the National Natural Science Foundation of China (11972181).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Barakos, Professor George
• Authors: Han, D., and Barakos, G. N.
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: Journal of the American Helicopter Society
• Publisher: American Helicopter Society
• ISSN: 0002-8711
• ISSN (Online): 2161-6027
• Published Online: 12 August 2022
• Copyright Holders: Copyright © 2023 Vertical Flight Society
• First Published: First published in Journal of the American Helicopter Society 68(1): 012008
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

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