摘要:
A rotation stabilizing device in a microgravitational rotating apparatus is provided by which vibration is suppressed and rotation is stabilized. Recess portions 10a, 10b are provided on a casing 10 so that bearings 14, 15 are arranged therein for supporting a rotary shaft 30. Experimental boxes 17a to 17h fixed to arms 16a to 16b rotate together with the rotary shaft 30. A fin 33 is fixed to outer circumferential surfaces of the experimental boxes 17a to 17b projecting outwardly therefrom. Pairs of electromagnetic coils 31a, 31b, in which the fin 33 is interposed with a predetermined gap maintained therebetween, and gap sensors 32 close thereto are fitted on the casing 10 side. Displacement of the fin 33 is detected by the gap sensors 32 to be inputted into a control unit to thereby control exciting current of the electromagnetic coils 31a, 31b. The gap is brought into the position within a demand value and rotation is stabilized.
摘要:
A substance mass measuring system is applied to a microgravitational rotating apparatus vibration control system to easily measure a mass of an object placed in an experimental box. Recess portions (10a, 10b) are provided in a casing (10). Both ends of a rotary shaft (30) are supported by bearings (11, 12) in the recess portions (10a, 10b). A lower end of the rotary shaft (30) is connected to a motor(13). Four arms (24 to 27), arranged horizontally in the direction of X and Y axes, are at their one ends fixed to the rotary shaft (30) and at the other ends fitted with experimental boxes (20 to 23). Experimental objects, such as plants or animals, are placed in the boxes (20 to 23) and rotated for experiments in the space. Vibration of the rotary shaft (30) and the boxes (20 to 23) is absorbed by the bearings (11, 12). Side plates (1a to 1d), acceleration sensors (2a to 2d) and distance sensors (3a to 3d) are arranged in the boxes (20 to 23). By collision of the object with the side plate, mass of the object is computed based on signals from the sensors (2, 3).
摘要:
A nutational motion damper includes a damping body (30) positioned and constrained by springs (40) to slide on a guide plate (34) having a surface oriented substantially perpendicular to the axis of rotation of a gyroscopic body (22) by opposed spring members. The guide plate (34) is attached to a relatively non-rotating body coupled to the rotating gyroscopic body (22) to follow nutational motion. The springs (40) define a rest position for the damping mass on the axis of rotation and also urge the damping body against the guide plate.
摘要:
The object of the invention is to make it possible to detect vibrations which would destroy a micro-gravity environment, to grasp factors of the vibrations, to detect and grasp a position and a scale of meteoroid/debris collisions, and to establish a counter-measure. Vibration sensors 2 are disposed in a matrix array on a vibrating body 1 placed in a micro-gravity environment, and the vibration data are collected and fed to a computer 5. The computer 5 analyzes a spectrum of the vibration, in a neural network section a vibration source is specified on the basis of the analyzed spectra, in a fuzzy control section, actuators 6 are driven so as to reduce harmful vibrations in response to the vibration energy and the energy source specified by the neural network section, and if necessary, a vibration factor is eliminated. The computer 5 takes in the result of driving for the actuators 6, the results are learnt in the neural network section and in the fuzzy control section to be ready for generation of vibrations at the next time. The vibration sensor 2 comprises a reflector or a transparent refractor disposed as floating in a micro-gravity space, output means fixed to the vibrating body for emitting energy towards the reflector or transparent refractor, and a receiver fixed to the vibrating body for receiving energy sent from the reflector or transparent refractor and measuring the nature of vibrations of the vibrating body on the basis of movement of the reflected or permeated energy.
摘要:
The object of the invention is to make it possible to detect vibrations which would destroy a micro-gravity environment, to grasp factors of the vibrations, to detect and grasp a position and a scale of meteoroid/debris collisions, and to establish a counter-measure. Vibration sensors 2 are disposed in a matrix array on a vibrating body 1 placed in a micro-gravity environment, and the vibration data are collected and fed to a computer 5. The computer 5 analyzes a spectrum of the vibration, in a neural network section a vibration source is specified on the basis of the analyzed spectra, in a fuzzy control section, actuators 6 are driven so as to reduce harmful vibrations in response to the vibration energy and the energy source specified by the neural network section, and if necessary, a vibration factor is eliminated. The computer 5 takes in the result of driving for the actuators 6, the results are learnt in the neural network section and in the fuzzy control section to be ready for generation of vibrations at the next time. The vibration sensor 2 comprises a reflector or a transparent refractor disposed as floating in a micro-gravity space, output means fixed to the vibrating body for emitting energy towards the reflector or transparent refractor, and a receiver fixed to the vibrating body for receiving energy sent from the reflector or transparent refractor and measuring the nature of vibrations of the vibrating body on the basis of movement of the reflected or permeated energy.
摘要:
An essentially passive and "fuel-less" method for inverting the orientation of a preferably nutationally stable, dual spin spacecraft (10) disposed in an inclined orbit, includes the steps of increasing the rotational speed of (i.e., "spinning up") the spacecraft's despun platform (20) and decreasing the rotational speed of (i.e., "spinning down") the spacecraft's rotor (16), to thereby generate, via product of inertia coupling, a transverse torque of sufficient magnitude to temporarily destabilize the spacecraft and cause the spacecraft spin axis (12), which is the minimum moment of inertia axis of the spacecraft, to diverge and precess through a flat spin orientation and towards a final, inverted orientation, e.g., disposed at a precession angle of 180° relative to the initial orientation of the spacecraft spin axis. Normally, prior to the spacecraft spin axis reaching the final, inverted orientation, the spin axis encounters and is "stuck at" a barrier nutation angle beyond which further precession of the spacecraft spin axis is not possible without the implementation of a final acquisition procedure, which includes the steps of detecting the occurrence of the spin axis reaching the barrier nutation angle, and in response thereto, instituting limit cycle rotational motion of the platform, to thereby render non-secular the rotational motion of the platform, whereby the spacecraft damping system is brought into its pull-in or effective operating range for penetrating the barrier nutation angle, in order to achieve acquisition of the final inverted orientation of the spacecraft spin axis. Limit cycle rotation of the platform is preferably effectuated by means of applying a first and a second series of torquing pulses to the spacecraft despin motor suitable for reducing the rotational speed of the platform, the first series of pulses being of larger magnitude than that of the second series of pulses.