期刊
AEROSPACE SCIENCE AND TECHNOLOGY
卷 50, 期 -, 页码 44-54出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ast.2015.12.022
关键词
Aeroelasticity; Hopf bifurcation; Flutter; Hardening nonlinearity; Free-play nonlinearity; Higher-order spectra
资金
- Brazilian National Research Council - CNPq [305700/2013-8]
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- FAPEMIG through the INCT/EIE [CNPq 574001/2008-5]
- CNPq through the INCT/EIE [CNPq 574001/2008-5]
- CAPES through the INCT/EIE [CNPq 574001/2008-5]
This paper presents an investigation about the dynamic response of a three-degree of freedom airfoil with hardening nonlinearity in the pitching stiffness and free-play nonlinearity in the control surface stiffness using bifurcation and HOS analysis. An experimental apparatus was conceived to test an airfoil aeroelastic responses when nonlinearities of varying intensities are present. A numerical model is also used to simulate at the same conditions of the experimental tests. It is based on the classical theory for the linear unsteady aerodynamics with corrections for arbitrary motions coupled to a three-degree of freedom typical aeroelastic section, where the hardening effect is modeled by means of rational polynomial function, while the free-play is represented by hyperbolic functions combination. Aeroelastic responses are analyzed from numerical and experimental results. Hopf bifurcations are identified and diagrams of amplitudes versus airspeeds are used to investigate the conditions in which the system is supercritical or subcritical. Higher-order spectra analysis is also used to check on frequency couplings, thereby allowing to identify quadratic- and cubic-like nonlinear behavior. The study of the phenomena associated with the hardening, free-play and their intensity variation effects may be useful in the mitigation of undesired responses of aeroelastic systems. (C) 2016 Elsevier Masson SAS. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据