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Stability of an Unsymmetric Rotor on an Unsymmetric Support

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The stability of unsymmetric rotors on unsymmetric supports has long been of interest to engineers of rotating machinery. This topic is particularly germane to the study of two‐bladed helicopter rotors, which are unsymmetric by design. The equations of motion are derived for a two‐bladed rotor on an unsymmetric elastic support. Four degrees‐of‐freedom are considered. Two of these represent support flexibility, and two represent rotor flexibility. Stability is determined by various methods, and the results obtained are compared with previous work. These comparisons verify some qualitative predictions of earlier research snd also identify new mechanisms of instability that have not been previously understood.
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Document Type: Research Article

Affiliations: McDonnell Douglas Aircraft Co., St. Louis, Mo.

Publication date: 1979-10-01

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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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