INVESTIGADORES
PREIDIKMAN Sergio
congresos y reuniones científicas
Título:
Aeroservoelastic Behavior of a Wind Turbine Typical Section with an Active Smart Flexible Flap
Autor/es:
NICOLÁS G. TRIPP; SERGIO PREIDIKMAN; ANIBAL E. MIRASSO
Lugar:
Rosario, Santa Fe
Reunión:
Congreso; ENIEF 2011 - XIX Congreso sobre Métodos Numéricos y sus Aplicaciones; 2011
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 this work, the aeroservoelastic
behavior of a wind turbine blade typical section equipped with an active smart
flap is numerically simulated. The bending and torsion stiffness of the blade
are modeled by means of two springs placed at the shear center of the blade's
section. The displacements associated to these two deformation modes are
described by means of two discrete generalized coordinates. Structurally, the flap
is modeled as a continuous beam, with fixed-free boundary conditions, and an
embedded piezoelectric actuator. The bending mode of the flap is actively
excited through the use of a commercially available piezoelectric actuator. The
model response was compared to the data published by the actuator manufacturer.
Aerodynamically, the blade-flap system is modeled assuming the hypotheses of
thin airfoil theory. The aerodynamic loads are determined by replacing the
vortex sheet with a two dimensional (2D) version of the non-linear, unsteady,
vortex lattice method. 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 wind energy turbines.