Stability of an Unsymmetric Rotor on an Unsymmetric Support
Author: Zvolanek, Ivo
Source: Journal of the American Helicopter Society, Volume 24, Number 4, 1 October 1979 , pp. 36-42(7)
Publisher: AHS International
Abstract: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.
Document Type: Research Article
Affiliations: McDonnell Douglas Aircraft Co., St. Louis, Mo.
Publication date: October 1, 1979
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