Journal
JOURNAL OF FLUIDS AND STRUCTURES
Volume 69, Issue -, Pages 89-107Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jfluidstructs.2016.11.019
Keywords
Nonlinear aeroelasticity; Grazing bifurcation; Aperiodic solution; Limit cycle oscillations; Wind tunnel; Freeplay
Categories
Funding
- European Union [307265]
- Erasmus+ Programme
- European Research Council (ERC) [307265] Funding Source: European Research Council (ERC)
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Freeplay is a significant source of nonlinearity in aeroelastic systems and is strictly regulated by airworthiness authorities. It splits the phase plane of such systems into three piecewise linear subdomains. Depending on the location of the freeplay, limit cycle oscillations that span either two or three of these subdomains can result. The purpose of this work is to demonstrate the existence of two-domain cycles both theoretically and experimentally. A simple aeroelastic system with pitch, plunge and control deflection degrees of freedom is investigated in the presence of freeplay in pitch. It is shown that two-domain and three-domain cycles can result from a grazing bifurcation and propagate in the decreasing airspeed direction. Close to the bifurcation, the two limit cycle branches interact with each other and aperiodic oscillations ensue. Equivalent linearization is used to derive the conditions of existence of each type of limit cycle and to predict their amplitudes and frequencies. Comparisons with measurements from wind tunnel experiments demonstrate that the theory describes these phenomena with accuracy.
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