Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/30—Flywheels
  • F16F15/315—Flywheels characterised by their supporting arrangement, e.g. mountings, cages, securing inertia member to shaft
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
  • B64G1/00—Cosmonautic vehicles
  • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
  • B64G1/24—Guiding or controlling apparatus, e.g. for attitude control
  • B64G1/28—Guiding or controlling apparatus, e.g. for attitude control using inertia or gyro effect

Definitions

• the present invention relates to a flywheel which has a stator and a rotor rotatably mounted thereon, which has a flywheel on the outer circumference, means being provided which dampen undesired vibrations of the rotor.
• a flywheel e.g. used to stabilize spacecraft
• a prescribed swirl should be achieved at a certain speed. Since in a rotating body the moment of inertia and thus the twist is dependent on the square of the distance of the rotatable mass, the flywheel is provided on the outer radius of the rotor; this is connected to a bearing on the stator by means of connecting elements, for example spokes.
• connecting elements for example spokes.
• a rotor represents a system capable of oscillation. In particular when the spacecraft is started, very large load peaks can occur when external excitations occur with the resonance frequency of the system, which can damage the bearing, if not render the entire flywheel completely unusable.
• the flywheel has two separate flywheels.
• damping elements for example friction linings
• the two inertial masses are arranged with respect to one another in such a way that they touch each other as soon as one or both vibrate.
• the degree of damping depends solely on the vibration behavior of the two flywheels; a variable influencing of the damping from the outside is not possible here.
• the two flywheels and their mutual distance must be dimensioned within very narrow tolerances.
• the invention is based on the object of specifying a flywheel of the type mentioned at the outset, in which the vibration damping can be controlled and with as little complex means as possible.
• the elastic hollow body used according to the invention which can be filled with a gas or a liquid, can be expanded to different extents, with which its pressure on the flywheel can be controlled.
• the damping of the rotor can thus be adjusted very flexibly by placing the hollow body under a more or less strong gas or liquid pressure.
• the figure shows a cross section through a flywheel.
• the flywheel essentially consists of a stator 1 which is rigidly connected to a housing 2, and a rotor which is rotatably mounted on the stator 1.
• the rotor has a hub 3 which is rotatably arranged on the stator 1 by means of bearings 4 and 5.
• An annular flywheel 8 is connected to the hub 3 via spokes 6 and 7. Especially when a spacecraft is launched, in which such a flywheel is installed, the flywheel mass with the spokes vibrates very strongly, so that there is a risk that bearings 4 and 5 will be destroyed. Means are therefore provided which can dampen undesirable vibrations of the rotor.
• the rotor is surrounded by a holder 9 designed as a cylinder.
• this holder 9 is provided with two cutouts 10 and 11, which are provided on its inside and open towards the flywheel 8.
• An elastic hollow body 12, 13 forming a closed ring is accommodated in each of these recesses 10, 11.
• the hollow bodies 12, 13 can be filled with a gaseous or liquid medium.
• each hollow body 12, 13 has a valve, not shown in the drawing. Because the hollow bodies 12, 13 are elastic, they expand to a greater or lesser extent depending on the amount of gas or liquid supplied.
• the holder 9 is arranged with the hollow bodies 12 and 13 so close to the flywheel 8 that the hollow bodies 12 and 13 touch the flywheel 8 in the expanded state.
• Vibrations of the rotor are damped by the friction of the flywheel 8 on the hollow bodies 12, 13. Since the hollow bodies 12, 13 can be expanded to different extents, the degree of damping can be controlled. Any desired vibration damping can only be set by means of an easy-to-use gas or liquid flow control.
• the invention is not tied to the use of two annular hollow bodies as damping elements. Under certain circumstances, only an annular hollow body is sufficient. Deviating from this, several smaller hollow bodies can also be arranged distributed around the rotor.

Landscapes

• Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Remote Sensing (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Radar, Positioning & Navigation (AREA)
• Combined Devices Of Dampers And Springs (AREA)

Applications Claiming Priority (2)

Publications (1)

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Citations (2)

• 1992
  • 1992-05-23 DE DE19924217129 patent/DE4217129C1/de not_active Expired - Fee Related
• 1993
  • 1993-05-13 WO PCT/DE1993/000416 patent/WO1993024763A1/de not_active Ceased

Patent Citations (2)

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