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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modeling and dynamic characterization of nonlinear non-smooth aeroviscoelastic systems

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Author(s):
Sales, Thiago de P. [1] ; Pereira, Daniel A. [1] ; Marques, Flavio D. [2] ; Rade, Domingos A. [1]
Total Authors: 4
Affiliation:
[1] Aeronaut Inst Technol ITA, Div Mech Engn, Sao Jose Dos Campos - Brazil
[2] Univ Sao Paulo, Sao Carlos Sch Engn, Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MECHANICAL SYSTEMS AND SIGNAL PROCESSING; v. 116, p. 900-915, FEB 1 2019.
Web of Science Citations: 0
Abstract

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. (AU)

FAPESP's process: 15/20363-6 - Fault tolerant identification and control of rotating systems
Grantee:Katia Lucchesi Cavalca Dedini
Support Opportunities: Research Projects - Thematic Grants