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Stochastic Aeroelastic Analysis of Composite Helicopter Rotor

Murugan, Senthil and Ganguli, Ranjan and Harursampath, Dinesh Kumar (2011) Stochastic Aeroelastic Analysis of Composite Helicopter Rotor. In: Journal of the American Helicopter Society, 56 (1).

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Official URL: http://ahsjournal.org/resource/1/jhesak/v56/i1/p01...

Abstract

The effect of uncertainty in composite material properties on the aeroelastic response, vibratory loads, and stability of a hingeless helicopter rotor is investigated. The uncertainty impact on rotating natural frequencies of the blade is studied with Monte Carlo simulations and first-order reliability methods. The stochastic aeroelastic analyses in hover and forward flight are carried out with Monte Carlo simulations. The flap, lag, and torsion responses show considerable scatter from their baseline values, and the uncertainty impact varies with the azimuth angle. Furthermore, the blade response shows finite probability of resonance-type conditions caused by modal frequencies approaching multiples of the rotor speed. The 4/rev vibratory forces show large deviations from their baseline values. The lag mode damping shows considerable scatter due to uncertain material properties with an almost 40% probability of instability in hover.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Amer Helicopter Soc Inc.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 15 Jun 2011 07:56
Last Modified: 15 Jun 2011 07:56
URI: http://eprints.iisc.ernet.in/id/eprint/38214

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