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论文类型：期刊论文

发表时间：2016-05-01

发表刊物：ICIC Express Letters

收录刊物：EI、Scopus

卷号：10

期号：5

页面范围：1151-1156

ISSN号：1881803X

摘要：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.