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Rotor hub and pitch bearing without mounted rotor blades. The pitch bearing, also named blade bearing, is a component of modern wind turbines which connect the rotor hub and the rotor blade. [1] The bearing allows the required oscillation to control the loads and power of the wind turbine. The pitch system brings the blade to the desired ...
DVOR (Doppler VOR) ground station, collocated with DME. On-board VOR display with CDI MCT DVOR, Manchester Airport, United Kingdom.. Very High Frequency Omnidirectional Range Station (VOR) [1] is a type of short-range VHF radio navigation system for aircraft, enabling aircraft with a VOR receiver to determine the azimuth (also radial), referenced to magnetic north, between the aircraft to/from ...
The forces at play are rather tangential force, which pulls the blade around, and radial force, which acts against the bearings. When the rotor is stationary, no net rotational force arises, even if the wind speed rises quite high—the rotor must already be spinning to generate torque. Thus the design is not normally self-starting.
A VOR/DME ground station in Germany In radio navigation , a VOR/DME is a radio beacon that combines a VHF omnidirectional range (VOR) with a distance-measuring equipment (DME). [ 1 ] The VOR allows the receiver to measure its bearing to or from the beacon, while the DME provides the slant distance between the receiver and the station.
The yaw bearing system aligns the blades to the wind. It consists of the ring gear, yaw motor and the yaw bearing clamp assemblies . [2] The yaw bearing can be of the roller or gliding type and it serves as a rotatable connection between the tower and the nacelle of the wind turbine.
Rotor solidity is a function of the aspect ratio and number of blades in the rotor and is widely used as a parameter for ensuring geometric similarity in rotorcraft experiments. It provides a measure of how close a lifting rotor system is to an ideal actuator disk in momentum theory .
Blade element momentum theory is a theory that combines both blade element theory and momentum theory. It is used to calculate the local forces on a propeller or wind-turbine blade. Blade element theory is combined with momentum theory to alleviate some of the difficulties in calculating the induced velocities at the rotor.
The CDI was designed to interpret a signal from a VOR, LDA, or ILS receiver. These receivers output a signal composed of two AC voltages. When used with a VOR, a converter decodes this signal, and, by determining the desired heading or radial from a resolver connected to the OBS knob, provides a 150mV control signal to drive the CDI needle left or right.