期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 116, 期 -, 页码 900-915出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2018.07.003
关键词
Nonlinear aeroelasticity; Typical section model; Free-play; Viscoelasticity; Subcritical bifurcation; Limit cycle oscillation
资金
- National Council for Scientific and Technological Development (CNPq)
- National Institute of Science and Technology of Smart Structures in Engineering (INCT-EIE) [574001/2008-5]
- CNPq [301633/2013-3, 402238/2013-3, 307658/2016-3]
- So Paulo State Research Agency (FAPESP) [2015/20363-6]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [15/20363-6] Funding Source: FAPESP
In this work, viscoelastic materials are adopted for handling aeroelastic features of typical section models with three degrees-of-freedom, which present non-smooth, free-play type nonlinearities in their control surface. A rotational viscoelastic damper is added to the resilient element associated to the control surface motion of the typical section. Equations of motion are derived accounting for the viscoelastic damper dependence on frequency and temperature. For this, a fractional derivatives-based viscoelasticity constitutive law is considered. Aerodynamic forces are introduced based on linear potential unsteady aerodynamics accounting for arbitrary airfoil motions. The aeroelastic behavior is investigated through time domain simulations, from which bifurcation diagrams are constructed. Numerical results show that the addition of viscoelastic damping can increase the flutter speed noticeably and reduce the amplitudes of limit cycle oscillations for the system under consideration. Another observed benefit provided by the viscoelastic damper is that undesirable subcritical behavior for the bifurcation onset can be eliminated or modified to have a supercritical character. The influence of temperature on the aeroviscoelastic behavior is also investigated. Using the proposed strategy, nonlinear instabilities can be controlled, improving the safety margins of aeroelastic systems. (C) 2018 Elsevier Ltd. All rights reserved.
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