NONLINEAR RESPONSE OF A NON-ROTATING ROTOR BLADE TO A PERIODIC GUST

A rotating slotted cylinder (RSC) gust generator installed in the Duke University low speed wind tunnel was used to generate a gust excitation field, and the nonlinear response of a non-rotating flexible rotor blade to periodic gust excitations was studied theoretically and experimentally. The quant...

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Bibliographic Details
Published inJournal of fluids and structures Vol. 10; no. 7; pp. 721 - 742
Main Authors Tang, D.M., Dowell, E.H.
Format Journal Article
LanguageEnglish
Published London Elsevier Ltd 01.10.1996
Elsevier
Subjects
Applied sciences
Continuous cycle engines: steam and gas turbines, jet engines
Engines and turbines
Exact sciences and technology
Mechanical engineering. Machine design
Static conditions
Pulse response
Stall
Wind tunnel test
Dynamic stability
Testing equipment
Theoretical study
Helicopter rotor
Aeroelasticity
Non linear effect
Experimental study
Gust
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Summary:A rotating slotted cylinder (RSC) gust generator installed in the Duke University low speed wind tunnel was used to generate a gust excitation field, and the nonlinear response of a non-rotating flexible rotor blade to periodic gust excitations was studied theoretically and experimentally. The quantitative agreement between theory and experiment indicates that the assumption of an uniform chordwise gust angle of attack and an approximate solution procedure of the nonlinear equations are allowable for a high aspect ratio blade and the parameter range considered in this study. For a periodic gust flow field, the effects of geometric structural nonlinearity and aerodynamic nonlinearity on dynamic aeroelastic behavior are significant and lead to aperiodic or chaotic motion when stall occurs.
ISSN:0889-9746
1095-8622
DOI:10.1006/jfls.1996.0050