US4425785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Missile rolling tail brake torque system
Assignee: United States, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION THE, Administrator of
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Filing: 1982-01-11
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Granted: 1984-01-17
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Expires: 2002-01-11
Abstract
Abstract Apparatus for simulating varying levels of friction in the bearings 13 of a free rolling tail afterbody 11 on a canard-controlled missile 12 to determine friction effects on aerodynamic control characteristics. A ring 16 located between the missile body and the afterbody is utilized in a servo system to create varying levels of friction between the missile body and the afterbody to simulate bearing friction.
Inventors
- 👤 William T. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:50
CPC Classifications
G; G01; G01M; G01M13/00; G01M13/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
Apparatus for simulating varying levels of friction between a rotating body and a nonrotating body comprising: a ring between said rotating body and said nonrotating body; means for attaching said ring to said rotating body such that said ring rotates with said rotating body and is movable relative to said rotating body in the direction of said nonrotating body; and means for moving said ring in the direction of said nonrotating body to make frictional contact with said nonrotating body.
Claim 2
Dependent Claim
80 words
Apparatus for simulating varying levels of friction between a rotating body and a nonrotating body comprising: a ring between said rotating body and said nonrotating body; means for attaching said ring to said rotating body such that said ring rotates with said rotating body and is movable relative to said rotating body in the direction of said nonrotating body; and means for moving said ring in the direction of said nonrotating body to make frictional contact with said nonrotating body.
Claim 3
Dependent Claim
31 words
Apparatus as in claim 1 wherein said means for attaching said ring to said rotating body includes fingers and grooves on each of said ring and said rotating body that mesh.
Claim 4
Dependent Claim
40 words
Apparatus as in claim 1 wherein said means for moving said ring in the direction of said nonrotating body includes an electromagnet attached to said nonrotating body such that the magnetic path of the magnet is completed through said ring.
Claim 5
Dependent Claim
65 words
Apparatus as in claim 3 wherein said means for moving said ring further includes a torque balance that produces an electrical signal proportional to the torque applied to it, attached to said nonrotating body such that when said electromagnet causes said ring to make contact with said nonrotating body the friction between said ring and said nonrotating body applies a torque to said torque balance.
Claim 6
Dependent Claim
59 words
Apparatus as in claim 4 wherein said means for moving said ring comprises a servo system, including said electromagnet and said torque balance, in which a feedback signal is subtracted from a calibrated signal and the difference signal is applied to the coil of said electromagnet and the resulting signal produced by said torque balance is the feedback signal.
Claim 7
Dependent Claim
22 words
Apparatus as in claim 5 wherein said feedback signal is passed through a notch filter to dampen vibrations in the torque balance.
Claim 8
Dependent Claim
26 words
Apparatus as in claim 6 wherein said feedback signal is passed through a full wave rectifier to ensure that the feedback signal is the right polarity.
Claim 9
Dependent Claim
23 words
Apparatus as in claim 7 including means for measuring said feedback signal to indicate the friction between said nonrotating body and said ring.
Claim 10
Dependent Claim
17 words
Apparatus as in claim 7 including means for measuring the speed of rotation of said rotating body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |