Aeronautics and astronautics – Retarding and restraining devices – Friction brakes
Patent
1989-11-16
1991-08-27
Peters, Jr., Joseph F.
Aeronautics and astronautics
Retarding and restraining devices
Friction brakes
244110R, 244110F, 244110H, 114145R, B64C 2568
Patent
active
050427504
ABSTRACT:
An apparatus for controlling the rate of deceleration of a moving body. The apparatus has a cable or net for engaging a moving body and tape connected to the cable or net. The tape is wound onto a reel at the start of a deceleration and is unwindable from the reel during the deceleration so that unwinding the tape from the reel causes a corresponding rotation of the reel. A pump is operatively connected to the reel so that rotation of the reel causes pumping of a hydraulic fluid at a rate which increases as the rate of rotation of the reel increases. A control valve disposed across the discharge of the pump varies pressure drop across the control valve. A brake is provided for applying a braking force to the reel, and an actuator is provided for varying the braking force applied by the braking means in response to the pressure drop. A signal representative of the total linear length L that the tape has been unwound from the reel from the start of the deceleration to a particular time and the linear velocity V of the tape at that time are generated continuously or at frequent intervals during a deceleration. The actual flow rate FA through the control valve is also measured. A computer controls the actual flow rate FA through the control valve so that the value of FA divided by the value of V is approximately equal to a value R at the particular time during a deceleration, where R is a predetermined function of the linear length L the flexible means has been unwound.
REFERENCES:
patent: 2987278 (1961-06-01), Hoffman et al.
patent: 3138355 (1964-06-01), Larson et al.
patent: 3172626 (1965-03-01), Haber et al.
patent: 3317164 (1967-05-01), Marcheron
patent: 3350039 (1967-10-01), Crater
patent: 3414333 (1968-12-01), Merle
patent: 3474989 (1969-10-01), Strance
patent: 3599905 (1971-08-01), Strance
patent: 4331309 (1982-05-01), Myhr
Article, "Bringing Aviation to a Cool and Controlled Stop", David W. Moser and Andrew B. Walsh--B. F. Goodrich Aerospace and Defence, pp. 135, 140.
Datron Inc.
Ellis Christopher P.
Peters Jr. Joseph F.
Shiells Theodore F.
Spatz William J.
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