Two-domain and three-domain limit cycles in a typical aeroelastic system with freeplay in pitch


Journal Article

© 2016 Elsevier Ltd 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.

Full Text

Duke Authors

Cited Authors

  • Verstraelen, E; Dimitriadis, G; Rossetto, GDB; Dowell, EH

Published Date

  • February 1, 2017

Published In

Volume / Issue

  • 69 /

Start / End Page

  • 89 - 107

Electronic International Standard Serial Number (EISSN)

  • 1095-8622

International Standard Serial Number (ISSN)

  • 0889-9746

Digital Object Identifier (DOI)

  • 10.1016/j.jfluidstructs.2016.11.019

Citation Source

  • Scopus