摘要:
The inventive electromagnetic propelling device comprises four open magnetic cores (1,2,3,4) concentrating a vertical component of the geomagnetic field in an orbital vehicle which is oriented in the orbital coordinate system, three inducing windings (5,6,7) made of isolated copper wire and having a rectangular wind. One side of the winding is arranged inside the concentrated vertical component of the geomagnetic field thereby producing an external linear force when of direct current passes through the tandem direct current windings. Said external force acts upon the orbital vehicle in the direction of the flight thereof. The force direction is defined by the direction of the current in the inducing windings of the propelling device.
摘要:
Disclosed is a torque/reactive momentum wheel control system (300) for use in satellites for dynamic attitude maintenance and alteration where the flywheel of each momentum wheel (302a, 302b, 302c, 302d) is levitated by a high-temperature superconducting element repulsively interacting with permanent magnets in the flywheel. The spin rate (rpm) of the flywheel being controlled by either an active magneto or electromagneto drive system. Each momentum wheel is cooled by a cryo-cooler (304).
摘要:
A momentum management system (10) for spacecraft attitude control. The momentum management system (10) includes a rotor (14) that provides control torques to a spacecraft. A drive (25) is provided to rotate the rotor (14), and a torque generation device (27) to impart torque to the rotor (14). A gimbal assembly (12) couples the drive (25) to the rotor (14). The gimbal assembly (12) has a spinning gimbal (18), and attaches to the drive (25) and the rotor (14) through the use of flexure joints (20). These flexure joints (20) permit the rotor (14) to tilt in two axes relative to a drive shaft (22), through a range of angles from about 0 degrees to about 7 degrees under the control of the torque generation device (27).
摘要:
El sistema de generación de potencia eléctrica en órbita por medio de cables conductores flotantes embarcado en un vehículo espacial (1) comprende dos conjuntos de cables conductores electrodinámicos desnudos (sin aislante eléctrico) (2,3) conectados respectivamente a cada uno de los dos polos (4,5) de un sistema de utilización o almacenamiento de potencia eléctrica (6), y en donde cada conjunto está formado por al menos un cable conductor. En presencia de un plasma y de un campo magnético, como es el caso de un satélite orbitando en la ionosfera terrestre, una corriente eléctrica fluye de forma natural a lo largo de los cables conductores proporcionando una potencia eléctrica. La cantidad de potencia eléctrica obtenida dependerá del ambiente espacial, de la velocidad del satélite relativa al plasma, y de las propiedades y diseño de los cables (longitud, sección y material). El sistema se podrá optimizar empleando materiales que favorezcan la emisión de electrones por efecto termiónico o fotoeléctrico. Dichos materiales se utilizarán en la composición de los cables o para revestir su superficie a lo largo de su extensión completa o de partes de ella.
摘要:
Un dispositif d'action comprend des premiers moyens électromagnétiques (ME-H) installés sur un premier corps (H) et définissant un premier moment magnétique (MH) ainsi qu'un champ magnétique, et des seconds moyens électromagnétiques (ME-F) installés sur un second corps (F), distant du premier corps (H), et définissant un second moment magnétique (M F ) propre à interagir avec le champ magnétique. Il comprend en outre i) des moyens (ME-H) pour faire varier le premier moment magnétique (M H ) selon une première loi de variation choisie, afin de faire varier temporellement le champ magnétique, ii) des moyens (ME-F) pour faire varier le second moment magnétique (M F ) selon une seconde loi de variation de sorte qu'une force et un couple souhaités soient induits au niveau du second corps (F), et iii) des moyens de calcul (MC) chargés de déterminer la seconde loi de variation en fonction au moins de la force et du couple souhaités et de la première loi de variation.
摘要:
A space ship/space station (1) includes propulsion rockets (60) for translation and thrusters for station keeping and attitude control. The inner components (2, 8) are rotated to produce variable finite gravities, while the outer components are stationary for zero gravity. A vertical main module (2) has a horizontal network of minor modules (8) attached thereto to form the spokes and periphery of a wheel structure. This module network is rotated by electromagnetic bearings (44, 10) powered by vehicle (1) electricity. Docking nodes (68) are provided for visiting space ships. A meteor shield (84) is provided around main module (2) and the network of minor modules (8).
摘要:
The present invention provides a method for distinguishing a boundary of an object, and the object itself, from its background. In the method electromagnetic radiation is detected from at least two fields of view substantially spanning the boundary of the object and background adjacent to the boundary and superimposed or overlaid as images onto a detector (36). The method includes correlating spatial transitions in intensity of the overlaid images on the detector with a boundary of the object. When used for determining the attitude of a satellite with respect to the earth, the detector is a thermal infrared detector (36) thereby providing a sharp contrast between the thermal emission of the earth and cold space. The invention provides a simple, effective method and device for determining satellite orientation and/or attitude with respect to a thermal infrared-emitting target body. The sensor includes a segmented limb-looking mirror (32) to provide multiple fields-of-view within the field-of-regard and superimposing these fields-of-view as images onto a common detector (36). The required resolution can be obtained while providing a wide range of operational orbital altitudes. The attitude of the satellite can vary by a large angle from the minimal orientation while still permitting an accurate determination of attitude. Multiple channels in a modular form provide redundancy, improved accuracy, and the opportunity of providing more diverse configurations. The utilization of uncooled microbolometer arrays as imaging detectors removes the requirement for additional cooling equipment thereby providing a low cost, small size and low mass sensor with configurational flexibility and no moving parts.
摘要:
A system and a method for controlling a low-orbiting artificial satellite, wherein aerodynamic control surfaces causing rotation of the satellite about two axes on contact with the upper layers of the atmosphere are combined with magnetic couplers (1, 2, 3) using the Earth's magnetic field to cause rotational movement about the three main pitch, roll and yaw axes. The attitude of the satellite may thus be controlled with very high accuracy and low power consumption. Control laws are provided.
摘要:
The correcting torque magnetically applied to a satellite to control at least its roll/yaw attitude is determined by establishing the direction of the rolling/yawing plane, wherein a correcting torque can be generated strictly in this plane, by the interaction of a magnetic moment produced on board in the plane of the pitch axis and of the earth's magnetic field with said magnetic field. A control law is used whose gains vary as a function of the local magnetic field of the earth to take into account the predetermined stresses exerted on the poles of the system.
摘要:
A control moment gyroscope (10) including a rotor (16) extending along a rotor axis (18). The rotor includes a first and second rotor end. A gimbal housing (12) includes a magnetic suspension system for magnetically suspending the rotor (16) within the gimbal housing (12) to allow rotation of the rotor about the rotor axis. A first and second conical clutch (22, 24) positioned adjacent to the first and second rotor end, respectively, and connected to the gimbal housing couples the rotor to the gimbal housing if the magnetic suspension system is inoperative. The gyroscope (10) also includes an apparatus for forcing the first and second clutches (22, 24) to couple the rotor (16) to the gimbal housing (12).