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Indexed by:期刊论文

Date of Publication:2016-05-01

Journal:ICIC Express Letters

Included Journals:EI、Scopus

Volume:10

Issue:5

Page Number:1151-1156

ISSN No.:1881803X

Abstract:Control surface freeplay is an important structural nonlinearity in aeroelastic systems. In this paper, the effect of the control surface freeplay nonlinearity on the dynamic responses of an airfoil section is studied, and an active vibration suppression system with compensator is designed. Wagner function and Duhamel formulation are used to model the aerodynamic loads based on Theodorsen theory. The vibration characteristics of the nonlinear systems with different freeplay gaps are analyzed, and compared to the linear system without freeplay. Bifurcation and limit cycle oscillations occur due to the control surface freeplay, and the nonlinear systems are also divergent above the linear flutter speed. The influence of the freeplay nonlinearity on the closed-loop system is studied with a controller designed using LQR and over-damping phenomenon is found. The response speed of the closed-loop system for vibration suppression is improved effectively with the compensator. ? 2016 ICIC International.