Blade pitch

About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.

Pitch change mechanism

Abstract: The invention concerns a pitch change mechanism for an aircraft propeller in which a common ring gear (51) changes pitch of all propeller blades on a given rotor simultaneously Motion of the ring gear (51) is induced by a planet (40)-and-carrier (101) system driven by a pinion (110) Acceleration of the pinion causes a change toward flat pitch Deceleration of the pinion causes change toward feathered pitch If the motor driving the pinion fails, a large deceleration occurs, driving the blades to a safe, feathered position

Wind turbine blade pitch control system

Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

Control logic for a wind energy system

Abstract: The invention relates to wind energy system comprising a rotor (3) which can be wind-driven and which comprises adjustable rotor blades (4). The wind energy system also comprises a generator which is directly or indirectly connected to the rotor and which is provided for generating electrical energy. The generator can output power with a variable rotational speed of the rotor. A management system is also provided which is designed to regulate the rotational speed of the rotor within a predetermined wind speed range by adjusting the rotor blade angle, and which can shut down the operation of the system when a shut-down speed is exceeded. According to the invention, a wind energy system can be economically manufactured in an advantageous manner while using fewer materials and accruing lower energy costs if the management system is designed to regulate downward the rotational speed of the rotor and the power output by adjusting the rotor blade angle within a range between a predetermined limiting speed and the shut-down speed.

Control system for blades for a variable pitch propeller

Abstract: A system (10) for controlling propeller blade pitch is disclosed. The system (10) comprises a transfer tube (18), wherein the transfer tube (18) defines an element of the rotatable portion (12) and wherein the transfer tube (18) is non-translating relative the rotatable (12) and non-rotatable portions (26). A transfer bearing (16) for providing hydraulic fluid to and interfacing with the transfer tube (18) is also used, wherein the transfer bearing (16) is located on the non-rotatable portion (26). The system further includes a pitch change actuator (22) and a mechanism form (74) for actuating the pitch change actuator (22), wherein the mechanism (74) is fluidically connected to and translatable relative to the transfer tube (18). A device for measuring blade angle of the propeller blade (120) is also provided, wherein the device is separate and distinct from the transfer tube (18).