INVESTIGADORES
PREIDIKMAN Sergio
congresos y reuniones científicas
Título:
Modeling of a lifting surface with an active smart flexible flap
Autor/es:
NICOLÁS G. TRIPP; SERGIO PREIDIKMAN; ANIBAL E. MIRASSO
Lugar:
Salta
Reunión:
Congreso; MECOM 2012 - X Congreso Argentino de Mecánica Computacional; 2012
Institución organizadora:
Asociación Argentina de Mecánica Computacional
Resumen:
In the past years, the consumption of energy produced by
wind turbines had an exponential growth.This requirement gave momentum to the
development of larger turbines with the goal of producing more energy at the
same site, reducing the initial investment, and the operation and maintenance
costs.In order to achieve this objective, longer, lighter, maintenance-free
blades are required so that smaller loads are transferred to the other, more
expensive, wind turbine components. The resulting larger flexibility, imposes
new challenges to the blade and controller designs; henceforth, new concepts
are being developed to add more intelligence into these systems. During the
last few years, the electronics industry had invested resources into the
research and development of practical applications for piezoelectric ceramic
materials. The result of this effort was the development of high precision piezoelectric
actuators and sensors, which achieve forces and deformations that are
compatible with the ones needed for the control of aerodynamic surfaces. In a
former work by the authors, the aeroservoelastic behavior of a two dimensional
(2D) wind turbine typical section with an active smart flexible flap was
studied. In that work, the potential vibration control properties of an active
flexible flap were exposed. In the present work, the study is extended to the
three dimensional (3D) space. The flap is modeled as a flexible trailing edge,
excited by a piezoelectric actuator, which allows the active morphing of the
aerodynamic profile. Structurally, the flap is modeled as a continuum plate,
with fixed-free boundary conditions and a piezoelectric actuator at its
surface. The flap deflection, relative to the blade surface, is described by
the assumed modes method. The flap bending modes are excited actively by means
of a commercial piezoelectric actuator. Aerodynamically, the blade-flap system
is modeled using an unsteady version of the vortex lattice method. In this
model it is assumed that the viscous effects are confined at the boundary layer
attached to the surface and the wake shed by the surface. The wake is modeled with
vortex rings and it is allowed to move force-free. To capture the physical
aspects from the control-fluid-structure interaction, the models are combined
using a strong coupling technique. The equations of motion of the system are
integrated numerically and interactively in the time domain. In addition, the
stability and sensitivity of the system for input perturbations are analyzed.
The results show the feasibility of using this type of system in large horizontal
axis wind energy turbines.