INVESTIGADORES
PREIDIKMAN Sergio
congresos y reuniones científicas
Título:
Simulation of a Lifting Surface with a Flexible Piezoelectric Actuator in a Rotating Environment
Autor/es:
NICOLÁS G. TRIPP; SERGIO PREIDIKMAN; ANIBAL E. MIRASSO
Lugar:
Mendoza
Reunión:
Congreso; ENIEF 2013 - XX Congreso sobre Métodos Numéricos y sus Aplicaciones; 2013
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 study made by the authors, the
aeroservoelastic behavior of a lifting surface with a fixed end and a flexible
piezoelectric actuator was analyzed. In that work it was shown that the
flexible piezoelectric actuator is an effective tool for vibration control. In
the present paper, the analysis of the aeroservoelastic behavior of a lifting
surface with a flexible piezoelectric actuator is extended to a non-inertial
coordinate system that spins around an inertial one. The actuator is composed
of a flexible trailing edge with embedded piezoelectric layers that enables the
active control of the local aerodynamic forces. Structurally, both the flexible
surface and flap are modeled as continuous beams with fixed-free end
conditions. The displacements are described by a series expansion of assumed modes.
The system aerodynamics are modeled with an unsteady version of the vortex
lattice method
(UVLM). High Reynolds
number flow is assumed, therefore viscous effects are confined at the boundary
layers and the wake shed by the surface. Both surface and wake are idealized as
vortex sheets which in turn are discretized with vortex rings. In order to
capture the physical aspects from the fluid-structure-control interaction, the
aerodynamic and structural numerical models are combined by means of a strong
coupling technique. The system equations of motion are integrated iteratively
in the time domain. Numerical experiments are performed on a 100m test blade.
The results show the feasibility of utilizing this type of actuators in the
control of large horizontal axis wind turbines.