Topic
Blade pitch
About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
20 Aug 2007TL;DR: In this article, a pitch controller, uninterruptible power supply (112), and rotational speed detector (114) are disposed in the rotor (1) in a wind turbine, when a slip ring failure or wire breakage occurs, the pitch controller internally creates a pitch angle command so as to control the pitch angle.
Abstract: At the present invention, a pitch controller (111), uninterruptible power supply (112), and rotational speed detector (114) are disposed in the rotor (1) in a wind turbine. When a slip ring failure or wire breakage occurs, the pitch controller (111) internally creates a pitch angle command so as to control the pitch angle. Accordingly, even if the slip ring (7) between the rotor (1) and nacelle (2) fails in the wind turbine, pitch angle control is performed reliably.
22 citations
Patent•
29 May 1975
TL;DR: In this paper, a variable pitch blade and blade mount was proposed for composite fan blades and blade mounting arrangements where the blades are permitted to pivot relative to a turbine hub about an axis generally parallel to the centerline of the engine upon impact of a large foreign object, such as a bird.
Abstract: A variable pitch blade and blade mount which is suitable for propellers, fans and the like and which has improved impact resistance. The invention is particularly directed to composite fan blades and blade mounting arrangements wherein the blades are permitted to pivot relative to a turbine hub about an axis generally parallel to the centerline of the engine upon impact of a large foreign object, such as a bird. By thus providing for the pivoting of the blades upon impact, centrifugal force recovery becomes the principal energy absorbing mechanism and a blade having improved impact strength is obtained.
22 citations
TL;DR: Robust nonlinear control of a variable-pitch quadrotor with the flip maneuver with backstepping approach is presented and a systematic method to select controller gains is presented that ensures closed-loop stability.
22 citations
Patent•
23 Sep 2014TL;DR: In this paper, a turboprop control system with a turbine engine and a propeller having variable pitch blades is described. And the pilot provides, by a single power control lever 30, the control input used to control the engine and propeller.
Abstract: A turboprop control system 10 for use with a turboprop 2 having a turbine engine 12 operably coupled to and rotationally driving a propeller 14 having variable pitch blades 16 to control the engine speed, propeller speed, and propeller pitch. The pilot provides, by a single power control lever 30, the control input used to control the engine and propeller.
21 citations
Patent•
12 Oct 2010
TL;DR: In this paper, a variable pitch rate controller generates commands to drive an AC servo motor for blade feathering in an emergency wind turbine with a back-up storage unit, such as a super capacitor.
Abstract: A system and method are disclosed for an emergency feathering control of a wind turbine during emergency feathering of the turbine blades that is independent of a turbine control and pitch control unit. A variable pitch rate controller generates commands to drive an AC servo motor for blade feathering. A first pitch rate is obtained with a back-up storage unit, such as a super capacitor. The commands from the controller vary the pitch rate of the blades during feathering in an emergency to a second pitch rate that is different from the first pitch rate.
21 citations