Abstract
Vibration and real-time flow control of the 2D blade section of wind turbines with three degrees of freedom (3-DOF), excited by external pitch motion, are investigated based on an H-inf (H∞) controller using linear-matrix-inequality (HIC/LMI) design. The real-time flow control for the purpose of aeroelastic flutter suppression includes not only the driving process of real-time physical equipment, but also the realization of real-time control algorithm in the physical controller. The aeroelastic system combined with pitch motion is controlled by a kind of HIC/LMI algorithm. The real-time external pitch motion is driven by rack-piston cylinder (RPC) using a hydraulic transmission system (HTS). The unsteady aerodynamic loads model is simplified by the HTS system. The HTS is actuated by a proportional-flow valve (PFV) which is controlled by another HIC/LMI algorithm, a novel algorithm for waveform tracking. According to the result of waveform tracking, the input current signal of PFV is realized by the configuration of the controller hardware system and its external circuits. In two types of HIC/LMI algorithms, controller stabilities are affirmed using Lyapunov analyses, and controller values are derived and obtained by using LMI designs. Flutter suppression for divergent and instable displacements is shown, with obvious controlled effects illustrated. An online monitoring experimental platform using hardware-in-the-loop simulation, based on Siemens S7-200 programmable logic controller (PLC) hardware and Kingview detection system, is built to implement pitch motion based on HTS and configure the signal input of PFV in pitch control.
Highlights
Aeroelasticity and stability analysis are interdisciplinary fields of study dealing with the interactions between aerodynamic forces and elastic structures for turbomachinery cascades, aircraft wings or wind turbine blades
The unsteady aerodynamics and structural dynamics result in a set of linear aeroelastic equations for 2D typical airfoil according to classical flutter theories, which are especially suitable for qualitative analysis of aeroelastic responses of large wind turbine blades
Manny scholars have adopted Euler or Navier-Stokes models based on computational fluid dynamics (CFD), panel method models based on boundary element flow model (BEFM) and other interaction models for unsteady flow modeling in turbomachinery cascades or wind turbine blades to study the aeroelastic stability for classical flutter
Summary
Aeroelasticity and stability analysis are interdisciplinary fields of study dealing with the interactions between aerodynamic forces and elastic structures for turbomachinery cascades, aircraft wings or wind turbine blades. The flow solver was based on BEFM with unsteady potential flow described using a panel method Coupling schemes using both explicit and implicit design and two turbulence models with wall functions and wall treatment, have been used in a Navier-Stokes CFD aeroelastic model to investigate classical flutter of wind turbine blade sections [3]. The 2D section exhibits bending and twist displacements excited by external pitch motion, investigation and research on aeroelastic behavior of three degrees of freedom (3-DOF) blade are performed based on two types of HIC/LMI algorithms. Real-time flow control and classical flutter are investigated based on 3-DOF blade section rather than conventional 2-DOF (elastic bending and twist displacements) airfoil. Siemens S7-200 PLC hardware and a Kingview detection system, is built to implement pitch control based on KOS communication
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