Flap-wise stall flutter suppression of bending-shear coupling blades based on the piezoelectric actuation and robust control
The stall flutter and the active control of a wind turbine blade with flap-wise bending and transverse shear coupling were investigated based on the piezoelectric actuation and robust control in order to deal with the flap-wise fracture failure of the blade.The structure was modeled as a thin-walled single-cell composite section with a piezoelectric patch embedded.The aerodynamic expressions were based on a stall aerodynamic model suitable for pure pitch motions.The Galerkin method was adopted for the decoupling treatment and the aerodynamic calculation was carried out along the spanwise direction of the blade by using the strip method.The stability analysis and stall flutter suppression were implemented based on time domain responses by virtue of the active control including the piezoelectric feedback actuation and 3-weight mixed-sensitivity H∞ (3 WMSH) robust control.The piezoelectric feedback control was achieved,resulting in a flap bending motion at the blade tip based on the structural tailoring technology.The 3-weight robust control through the third weight for the noise attenuation can restrict the output signal,and force the system to be stable.In order to verify the universality of the 3WMSH control,a further validation on the 3WMSH control was put forward concerning the phase plane analysis and the eigenvalue analysis on the cases of large range variable pitch angles and ply angles.
flap-wise bending/transverse shear couplingstall flutterpiezoelectric actuationflutter suppression3-weight mixed-sensitivity H∞ control
NETL
NSTL
万方数据
维普
