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Friction, Freeplay and Flutter of Manually Controlled Aircraft
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Flight Dynamics. (Flight Dynamics)ORCID iD: 0000-0002-3199-8534
2007 (English)In: IFASD 2007: International Forum on Aeroelasticity and Structural Dynamics, 2007Conference paper (Other academic)
Abstract [en]

The effect of nonlinear friction and freeplay in the control system on flut- ter is investigated for the case of light aircraft with manually operated control surfaces. A standard linear modal subspace model of the aeroelastic system is extended with nonlinear terms, so that time-domain simulations can be per- formed. Furthermore, the harmonic balance method is employed to obtain a frequency-domain formulation, which allows a convenient, though approxi- mate, computation of the stability boundary. Comparison with time-domain analyses for the case of a full aircraft configuration show that typical magni- tudes of hinge friction can stabilize oscillations with small displacement am- plitudes, while large amplitude motion remains unstable. Harmonic balance methods can be used to determine if such a behavior is present, but time- domain computations are necessary to evaluate the response of the system to a given excitation.

Place, publisher, year, edition, pages
National Category
Aerospace Engineering
URN: urn:nbn:se:kth:diva-77699OAI: diva2:491963
International Forum on Aeroelasticity and Structural Dynamics 2007, Stockholm, Sweden
QC 20120208Available from: 2012-02-08 Created: 2012-02-07 Last updated: 2012-02-08Bibliographically approved

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