Abstract
Flap/lag stall nonlinear flutter and active control of anisotropic composite wind turbine blade modeled as antisymmetric beam analysis have been investigated based on robust H2controller. The blade is modeled as single-cell thin-walled beam structure, exhibiting flap bending moment-lag transverse shear deformation, and lag bending moment-flap transverse shear deformation, with constant pitch angle set. The stall flutter control of dynamic response characteristics of composite blade incorporating nonlinear aerodynamic model is investigated based on some structural and dynamic parameters. The aeroelastic partial differential equations are reduced by Galerkin method, with the aerodynamic forces decomposed by strip theory. Robust H2optimal controller is developed to enhance the vibrational behavior and dynamic response to aerodynamic excitation under extreme wind conditions and stabilize structures that might be damaged in the absence of control. The effectiveness of the control algorithm is demonstrated in both amplitudes and frequencies by description of time responses, extended phase planes, and frequency spectrum analysis, respectively.
Highlights
Flap/lag stall flutter in dynamic stall state is an important reason of fatigue damage for large-scale wind turbine blades
For the active control of aeroelastic instability for large wind turbines blade based on load reduction, some researchers have conducted a lot of work in the last few years
Classical flutter and active control of singlecell thin-walled composite wind turbine blade beam with bending-twist coupling based on actual physical piezoelectric actuation and intelligent linear quadratic Gaussian (LQG) algorithm are analyzed in [6]
Summary
Flap/lag stall flutter in dynamic stall state is an important reason of fatigue damage for large-scale wind turbine blades. The advanced active twist rotor blade incorporating single crystal macrofiber composite actuators and the aeroelastic analysis are designed and performed by Park and Kim [5]. In these works, the active control properties dynamically represent an actual physical structure and mechanism, the intelligent control theory and algorithms are rarely used. Classical flutter and active control of singlecell thin-walled composite wind turbine blade beam with bending-twist coupling based on actual physical piezoelectric actuation and intelligent LQG algorithm are analyzed in [6]. In present work the stall nonlinear flutter and control of large-scale wind turbine blade under extreme conditions have been investigated for composite single-cell thin-walled structure based on robust H2 optimal control. Stall nonlinear flutter stability and robust H2 optimal control effects based on different parameters are analyzed here by dynamic responses
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