US4776541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidic momentum controller
Assignee: National Aeronautics and Space Administration
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Filing: 1987-02-27
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Granted: 1988-10-11
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Expires: 2007-02-27
Abstract
Abstract Large angular control moments and torques are developed by controllably circulating a relatively small mass of liquid (22) through small diameter pipes (20) describing a large diameter loop (15f,a,b). The loop (15), by thus generating and storing angular momentum, can thereby provide efficient cancellation of periodic, non-accumulating, externally induced rotational disturbances. The loop (15) is preferably located on or near the periphery of a structure (10) which is to be thus stabilized.
Inventors
- 👤 Ronald S. Maynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:04
CPC Classifications
B; B64; B64G; B64G1/00; B64G1/22; B64G1/24; B64G1/38; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2121; Y10T74/2122
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A method for controlling and maintaining in any desired stable attitude a delta shaped space station in low earth orbit, comprising: installing three independent, planer, fluidic loops containing fluid having a density and viscosity approximating that of water or less around the periphery of three non-parallel faces of the delta shaped space station; providing means responsive to disturbances produced by aerodynamic and gravity gradients of the delta shaped space station for generating signals proportional thereto; and providing means in each loop responsive to said signals for propelling said fluid through said loop in a direction and a speed and velocity to generate control torque and momentum counteracting said disturbances.
Claim 2
Independent Claim
109 words
A method for controlling and maintaining in any desired stable attitude a delta shaped space station in low earth orbit, comprising: installing three independent, planer, fluidic loops containing fluid having a density and viscosity approximating that of water or less around the periphery of three non-parallel faces of the delta shaped space station; providing means responsive to disturbances produced by aerodynamic and gravity gradients of the delta shaped space station for generating signals proportional thereto; and providing means in each loop responsive to said signals for propelling said fluid through said loop in a direction and a speed and velocity to generate control torque and momentum counteracting said disturbances.
Claim 3
Dependent Claim
42 words
The method specified in claim 1 and including installing fluid reservoirs in communication with the fluidic loop whereby by increasing or decreasing the amount of fluid in the respective reservoirs the overall total mass distribution of the space station can be adjusted.
Claim 4
Dependent Claim
35 words
The method specified in claim 2 including attaching radiating fins and sources of heat to the fluidic loop whereby the absorbed heat is radiated into open space during transport of the fluid in the loop.
Claim 5
Dependent Claim
35 words
The method specified in claim 1 including attaching radiating fins and sources of heat to the fluidic loop whereby the absorbed heat is radiated into open space during transport of the fluid in the loop.
Claim 6
Dependent Claim
14 words
The method specified in claim 1 including providing micrometeorite shielding for the fluidic loops.
Claim 7
Dependent Claim
132 words
A space station capable of being maintained in any desired stable attitude in low earth orbit, said station comprising: at least one independent, planer, fluidic loop containing fluid having a density and velocity approximating that of water or less attached around a periphery of the space station; a plurality of spaced ballast reservoirs in the fluidic loop; means responsive to disturbances produced by aerodynamic and gravity gradients for generating signals proportional to such disturbances; means to increase or decrease the amount of fluid in respective ballast reservoirs whereby the total mass distribution of the space station can be adjusted; and means in said fluidic loop responsive to said signals for propelling said fluid through said loop in a direction and speed and velocity to generate control torque and momentum counteracting said disturbances.
Claim 8
Dependent Claim
132 words
A space station capable of being maintained in any desired stable attitude in low earth orbit, said station comprising: at least one independent, planer, fluidic loop containing fluid having a density and velocity approximating that of water or less attached around a periphery of the space station; a plurality of spaced ballast reservoirs in the fluidic loop; means responsive to disturbances produced by aerodynamic and gravity gradients for generating signals proportional to such disturbances; means to increase or decrease the amount of fluid in respective ballast reservoirs whereby the total mass distribution of the space station can be adjusted; and means in said fluidic loop responsive to said signals for propelling said fluid through said loop in a direction and speed and velocity to generate control torque and momentum counteracting said disturbances.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |