Prediction of the unstable regions of a reciprocal system governed by a set of linear equations with periodic coefficients

Gladwell, G. M. L.; Stammers, Charles W

doi:10.1016/0022-460x(68)90249-6

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1976

1989

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Cited by 8 publications

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“…The two-bladed helicopter rotors have received less attention after Coleman and Feingold's study. Gladwell and Stammers' 24 ' studied the reciprocal systems governed by a set of linear equations with periodic coefficients, and applied their theory to the ground resonance instability of two-bladed helicopter rotors with symmetric supports. Schroder* 21 ' studied the spatial and planar systems of two-bladed rotors on symmetrical supports.…”

Section: Review Of Existing Analysesmentioning

confidence: 99%

Helicopter ground resonance — a spatial model analysis

Nahas¹

1984

Aeronaut. j.

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Classic theory of helicopter ground resonance studies the phenomenon on a planar model obtained by reducing the dynamic parameters of the full helicopter into the plane of rotation. In this paper the phenomenon is studied on a spatial helicopter model of six degrees of body freedom. It is found that in general there exist six regions of instability, whereas the planar theory of Coleman determines only one region. The theoretical results obtained here are verified by experiments conducted on a dynamic model of helicopter. In addition, this paper reviews all the existing analyses which have studied the problem.

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Section: Review Of Existing Analysesmentioning

confidence: 99%