1,635 research outputs found
The Largest Rotating Machines on Earth: Challenges and Opportunities from an Aeroelastic Perspective and Beyond
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Wind Sensing: a New Technology to Estimate the Inflow at the Rotor Disk for Smart Wind Turbine and Wind Farm Control
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Online model updating by a wake detector for wind farm control
No full textAn engineering wake model is updated online based on measurements provided by shaded turbines. Departing from other approaches, the measurements include information on the impinging wakes, obtained by a wake detector based on measured rotor loads. The updated model exhibits improved prediction capabilities, and it can be used for implementing a model-based wind farm controller
On the Design of Energy Preserving and Decaying Schemes for Flexible, Nonlinear Multibody Systems
No full textEnergy preserving schemes achieve unconditional stability for nonlinear systems by establishing discrete energy preservation statements. Several schemes have been presented by various authors within drastically different frameworks: finite difference schemes based on a mid-point approximation, Galerkin and time discontinuous Galerkin approximations of the equations of motion written in the symmetric hyperbolic form, finite elements in time, and 2-stage FSAL Runge-Kutta methods. Furthermore, different types of parameterization of finite rotations were used in the various formulations. This paper presents a unified, finite difference framework which readily allows comparing the various schemes and their respective properties. Numerical examples are presented and show that the predictions of two of these schemes are in very close agreement with each other. (C) 1999 Elsevier Science S.A. All rights reserved
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