摘要:
Described herein are systems and methods for attitude determination using infrared Earth horizon sensors (EHSs) with Gaussian response characteristics. Attitude information is acquired by detecting Earth's infrared electromagnetic radiation and, subsequently, determining the region obscured by Earth in the sensors' fields of view to compute a nadir vector estimation in the spacecraft's body frame. The method can be applied when two sensors, each with known and distinct pointing directions, detect the horizon, which is defined as having their fields of view partially obscured by Earth. The method can be implemented compactly to provide high-accuracy attitude within small spacecraft, such as CubeSat-based satellites.
摘要:
A supporting mechanism of a micro gravity rotating apparatus in which magnetic bearings are applied to the rotary shaft in order to absorb and damp vibration of the rotary shaft. A casing (10) is provided with recesses (10a, 10b), coils (1, 2) of magnetic bearings (11, 12) are arranged on the periphery thereof and vibration sensors (3, 4) are arranged on the inside thereof. Lower end of a rotary shaft (30) is coupled with a motor (13), opposite end parts of the rotary shaft are supported by magnetic force, four arms (24 to 27) are secured on the X and Y axes in the horizontal direction and experiment boxes (20 to 23) are fixed to the forward ends thereof. Experiments are conducted by placing plants, animals, or the like, in the boxes (20 to 23) and then turning the boxes (20 to 23) in the space. The rotary shaft (30) vibrates due to unbalance of objects in the boxes and the vibration is detected by means of the vibration sensors (3, 4) and absorbed by controlling the exciting current of the coils (1, 2).
摘要:
In a magnetically mounted, position-stabilised flywheel, the force-generating systems (M1) at least for the rotary drive are designed to operate on the electrodynamic principle and located inside the wheel hub. The coils are situated on the stator (S) and the associated permanent magnets are situated on the rotor (R). Unwanted oscillations are effectively damped. Transferring the drive to the interior of the hub permits the use of small coils. The angular range of the wheel is sufficiently large.
摘要:
In a magnetically mounted oscillation-damped flywheel, both the force generating systems (M1, M2) for the radial drive and transverse movement and the corresponding control sensors (SE1...SE4) are located in the wheel hub. Parasitic oscillations can thus be drastically attenuated without any adverse effect on the wheel's swivelling range.
摘要:
Sistema de propulsión en órbita por medio de cables conductores flotantes embarcado en un vehículo espacial (1), que comprende dos conjuntos de cables conductores electrodinámicos (2, 3) conectados respectivamente a cada uno de los dos polos (4, 5) de una fuente generadora de potencia eléctrica (6), y en donde cada conjunto está formado por al menos un cable conductor. En presencia de un plasma y un campo magnético, como en la ionosfera terrestre, una corriente eléctrica fluye de forma natural a lo largo de los cables conductores. Por la interacción del campo magnético con dicha corriente se genera una fuerza de Lorentz sobre los cables. Dicha fuerza se puede utilizar para controlar la órbita del vehículo espacial (1), variándola en sentido y magnitud por medio de la fuente generadora de potencia eléctrica (6), lo que permite modificar la intensidad y sentido de la corriente a lo largo de los cables.
摘要:
La présente invention concerne un procédé (50) de commande de magnéto-coupleurs (24) d'un système de contrôle d'attitude d'un véhicule spatial (10) soumis à un champ magnétique externe de direction variable, lesdits magnéto-coupleurs étant mis en œuvre pour dé-saturer un dispositif de stockage (20) de moment angulaire par transfert de moment angulaire et étant adaptés à former, en coopération avec le champ magnétique externe local, des couples magnétiques dans un plan orthogonal à la direction dudit champ magnétique externe local, dit « plan de contrôle local ». Le procédé (50) de commande est caractérisé en ce que le couple magnétique à former dans le plan de contrôle local est déterminé en fonction de la composante d'un couple de contrôle d'attitude souhaité qui est orthogonale au plan de contrôle local, dite « composante localement incontrôlable », la contribution de la composante localement incontrôlable au couple magnétique à former étant non nulle lorsque ladite composante localement incontrôlable est non nulle.
摘要:
Die Erfindung zeigt eine Satelliten-Konstellation bestehend aus einem Master-Satelliten und einem oder mehreren Slave-Satelliten, bei der von den vom Slave-Satelliten benötigten Regelkreisen mindestens einer über Master-Satelliten geschlossen wird.
摘要:
The system of the present invention is a spacecraft architecture for precision motion control of a payload (10) while isolating disturbances and vibrations to the payload. The motion of the payload module is controlled by reacting on the support module (12) using non-contact actuators (14) disposed between the two modules. The motion of the support module is controlled to follow the payload module using external actuators (24, 26, 28, 30, 32) that react against the surroundings. This system achieves vibration isolation down to zero frequency and is not limited by sensor characteristics.
摘要:
A satellite comprises at least one surface (4, 5) intended mainly for exposure to solar radiation and extending away from the satellite in a predetermined direction (Y), an on-board computer (8) having connected thereto an attitude sensing system (7), an orbit control system for imparting thrust to the satellite along predetermined axes, and an attitude control system. Said satellite further comprises a device (6') for controlling the tilt of said surface in parallel with a plurality of planes containing said predetermined direction (and therefore particularly in parallel with the plane of a solar panel forming said surface). Said tilt control device is controlled by said on-board computer. Said tilting can generate a moment of pitch or relocate the centre of gravity onto the axis of the orbit control system.
摘要:
La présente invention concerne un procédé (50) de détection de panne d'un bras de propulsion (20, 21 ) comportant un propulseur (30, 31 ) et une articulation (22, 23, 24), ledit bras de propulsion étant adapté à former un couple qui est relié à un état du bras de propulsion par une fonction de formation de couple. Ledit procédé comporte : - le calcul (51 ) d'un espace d'isolation de panne, associé à l'articulation du bras de propulsion, en fonction du gradient de la fonction de formation de couple, - l'estimation (52) d'une vitesse de rotation de l'engin spatial (10), - l'estimation (53) d'un résidu de moment cinétique de l'engin spatial, - le calcul (54) d'un résidu articulaire, associé à l'articulation du bras de propulsion, par projection du résidu de moment cinétique sur l'espace d'isolation de panne, - la recherche (55) d'une panne d'articulation en fonction du résidu articulaire.