Yazarlar

• Bolat, Fevzi Cakmak(2)
• Sivrioglu, Selim(2)

• MakaleAçık Erişim2020Scopus SJRQ2/r/bayburt/13546
  Switching linear quadratic Gaussian control of a flexible blade structure containing magnetorheological fluid

  Sivrioglu, Selim; Bolat, Fevzi Cakmak

  The present study suggests a new active control structure with a switching algorithm for control current of the electromagnetic actuator to suppress vibrations of a flexible blade element containing magnetorheological (MR) fluid. An identification model between MR fluid inside the blade and the electromagnetic actuator is utilized to derive the force equation. Since only one electromagnet is employed to suppress the blade vibration, a single-sided control actuation occurs in the proposed system. Therefore, the pulling force used for vibration control is generated by the actuator when the blade moves to downward direction. A switching linear quadratic Gaussian (LQG) controller that produces always a positive control input is designed to attenuate the blade vibrations. The LQG controller with switching is experimentally implemented under the impact and steady-state aerodynamic disturbances. The results of experiments show that the proposed switching controller is effective to attenuate vibrations of the flexible blade element.

  AtıfScopus15·WoS11·OpenAlex13

  İncele
• MakaleAçık Erişim2018Scopus SJRQ2/r/bayburt/12407
  Active control of a small-scalewind turbine blade containing magnetorheological fluid

  Bolat, Fevzi Cakmak; Sivrioglu, Selim

  This research study proposes a new active control structure to suppress vibrations of a small-scale wind turbine blade filled with magnetorheological (MR) fluid and actuated by an electromagnet. The aluminum blade structure is manufactured using the SH3055 (BergeyWindpower Co. Inc., Norman, OK, USA) code numbered airfoil which is designed for use on small wind turbines. A dynamic interaction model between the MR fluid and the electromagnetic actuator is constructed to obtain a force relation. A detailed characterization study is presented for the proposed actuator to understand the nonlinear behavior of the electromagnetic force. A norm based multi-objective H2/H∞ controller is designed using the model of the elastic blade element. The H2/H∞ controller is experimentally implemented under the impact and steady state aerodynamic load conditions. The results of experiments show that the MR fluid- electromagnetic actuator is effective for suppressing vibrations of the blade structure.

  AtıfScopus23·WoS22·OpenAlex22

  İncele