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A small reaction wheel viewed in profile A momentum/reaction wheel comprising part of a high-accuracy Conical Earth Sensor to maintain a satellite's precise attitude. A reaction wheel (RW) is an electric motor attached to a flywheel, which, when its rotation speed is changed, causes a counter-rotation proportionately through conservation of angular momentum. [1]
Alternatively, reaction wheels can be used for attitude control. Use of diverted engine thrust to provide stable attitude control of a short-or-vertical takeoff and landing aircraft below conventional winged flight speeds, such as with the Harrier "jump jet", may also be referred to as a reaction control system. [1]
Another method for achieving three-axis stabilization is to use electrically powered reaction wheels, also called momentum wheels, which are mounted on three orthogonal axes aboard the spacecraft. They provide a means to trade angular momentum back and forth between spacecraft and wheels. To rotate the vehicle on a given axis, the reaction ...
I used to design both Reaction Wheels and Momentum Wheels for spacecraft. Although they each have similarities between them, they are different animals. A reaction wheel imparts a instantaneous reaction torque into the spacecraft structure when accelerated / decelerated from 'coasting' RPM.
The slew of 3-axis stabilized spacecraft is typically in closed loop control with thrusters or electrically-powered reaction wheels maintaining or altering the craft's attitude based on sensor measurements. A typical example is a space telescope that should be turned to observe a new celestial object.
Reaction wheels, inertial measurement units, and star trackers are used to maintain orientation, with cold gas thrusters to desaturate the wheels. Communications are in X-band via a 60 cm (24 in) diameter dish antenna. A 200 cm (79 in) boom extends above the spacecraft, hosting the EMAG and ELP mNLP sensors. [2]
The following other wikis use this file: Usage on cs.wikipedia.org Reverzní Segnerovo kolo; Usage on fr.wikipedia.org Bateau pop-pop; Tourniquet de Feynman
The spade discovered in archaeological excavations in Poole Harbour is 3,500 years old. ‘Unique’ Bronze Age wooden spade found during wetlands creation project Skip to main content