Patent US3709033A successfully refreshed from Google Patents.
US3709033A
Expired / Lapsed
US
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Velocity monitor for aircraft
Assignee: Rolls Royce PLC
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Filing: 1970-10-19
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Granted: 1973-01-09
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Expires: 1990-10-19
Abstract
Abstract This invention pertains to a velocity monitor for an aircraft wherein a signal is given if, during the ground-roll of a takeoff, the actual velocity falls below that necessary for successful take-off. To this end there is provided in series connection an accelerometer, a first and a second integrator, a function generator and a comparator for the first integral being a signal of actual velocity and the output of the function generator being a signal of desired velocity. The output of the comparator shows whether actual velocity is above or below the desired velocity.
Inventors
- 👤 J Pollitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:29
CPC Classifications
G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P7/00; G05; G05D; G05D1/00; G05D1/0083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
Apparatus for monitoring the velocity of an aircraft comprising means capable of cooperating with the aircraft for producing a first velocity signal indicAtive of the actual velocity of the vehicle, means capable of cooperating with the vehicle for producing a signal indicative of the distance travelled by the vehicle, means for deriving a second velocity signal which is a predetermined function of the distance signal and has a mean slope, means for varying the mean slope of said function to produce a modified function signal, means for comparing the first velocity signal and the modified function signal to produce an output indicative of the relative superiority of the compared signals, an accelerometer, an instrument for the display of acceleration including two independently movable indicators, means for driving one of the indicators in response to the output of the accelerometer, and means for setting the other indicator connected to said means for varying the mean slope of said function to make the latter indicator variable in response to actuation of the setting means.
Claim 2
Dependent Claim
172 words
Apparatus for monitoring the velocity of an aircraft comprising means capable of cooperating with the aircraft for producing a first velocity signal indicAtive of the actual velocity of the vehicle, means capable of cooperating with the vehicle for producing a signal indicative of the distance travelled by the vehicle, means for deriving a second velocity signal which is a predetermined function of the distance signal and has a mean slope, means for varying the mean slope of said function to produce a modified function signal, means for comparing the first velocity signal and the modified function signal to produce an output indicative of the relative superiority of the compared signals, an accelerometer, an instrument for the display of acceleration including two independently movable indicators, means for driving one of the indicators in response to the output of the accelerometer, and means for setting the other indicator connected to said means for varying the mean slope of said function to make the latter indicator variable in response to actuation of the setting means.
Claim 3
Dependent Claim
119 words
Apparatus for monitoring the velocity of an aircraft comprising in series connection an accelerometer, a first integrator, a second integrator, a function generator for generating a predetermined function having a means slope, and manually operable means for varying the mean slope of the output of the function generator; and further comprising a comparator having as its inputs the output of the first integrator and the output of the manually operable means, a display means connected to the comparator for showing whichever of the two comparator inputs is the greater, a display means for the output of the accelerometer, a scale of acceleration included in the latter means, and the manual means being arranged to be settable against said scale.
Claim 4
Dependent Claim
119 words
Apparatus for monitoring the velocity of an aircraft comprising in series connection an accelerometer, a first integrator, a second integrator, a function generator for generating a predetermined function having a means slope, and manually operable means for varying the mean slope of the output of the function generator; and further comprising a comparator having as its inputs the output of the first integrator and the output of the manually operable means, a display means connected to the comparator for showing whichever of the two comparator inputs is the greater, a display means for the output of the accelerometer, a scale of acceleration included in the latter means, and the manual means being arranged to be settable against said scale.
Claim 5
Dependent Claim
184 words
Apparatus for monitoring the velocity of an aircraft during ground roll comprising first integrating means capable of cooperating with an accelerometer in said aircraft for producing a first velocity signal corresponding to the actual instantaneous velocity of the aircraft; second integrating means coupled to the output of said first integrating means for producing a signal corresponding to the actual instantaneous distance travelled by said aircraft during ground roll; function generator means having its input coupled only to the output of said second integrating means for producing a second velocity signal which is a predetermined increasing function of the actual instantaneous distance travelled by said aircraft, said predetermined function having a mean positive slope; means for varying the mean slope of said predetermined function as an approximate function of the acceleration required at the commencement of the take-off run to produce a modified function signal corresponding to the desired velocity of said aircraft; and means for comparing the first velocity signal and the modified function signal to produce an output indicative of the actual instantaneous velocity of the aircraft as compared to the desired velocity.
Claim 6
Dependent Claim
184 words
Apparatus for monitoring the velocity of an aircraft during ground roll comprising first integrating means capable of cooperating with an accelerometer in said aircraft for producing a first velocity signal corresponding to the actual instantaneous velocity of the aircraft; second integrating means coupled to the output of said first integrating means for producing a signal corresponding to the actual instantaneous distance travelled by said aircraft during ground roll; function generator means having its input coupled only to the output of said second integrating means for producing a second velocity signal which is a predetermined increasing function of the actual instantaneous distance travelled by said aircraft, said predetermined function having a mean positive slope; means for varying the mean slope of said predetermined function as an approximate function of the acceleration required at the commencement of the take-off run to produce a modified function signal corresponding to the desired velocity of said aircraft; and means for comparing the first velocity signal and the modified function signal to produce an output indicative of the actual instantaneous velocity of the aircraft as compared to the desired velocity.
Claim 7
Independent Claim
197 words
The method of monitoring the velocity of an aircraft during ground-roll prior to take-off comprising the steps of a. determining the initial acceleration required at the commencement of the ground-roll to attain said take-off velocity and setting a function modifier in accordance with said initial acceleration, b. determining the actual instantaneous acceleration of said aircraft during ground-roll, c. displaying the initial acceleration required at the commencement of ground-roll to attain safe take-off velocity and the actual instantaneous acceleration of said aircraft, d. determining the actual instantaneous velocity of said aircraft during ground-roll, e. determining at each instant the distance travelled by said aircraft during ground-roll, f. generating a predetermined velocity function varying substantially with the distance travelled during ground-roll by said aircraft, said predetermined velocity function having a mean slope, g. modifying the mean slope of said predetermined velocity function in accordance with said initial acceleration reQuired for a safe take-off to produce a modified velocity function, h. comparing the instantaneous velocity of said aircraft with said modified velocity function, and i. indicating whether the instantaneous velocity is less than the modified velocity function, as instantaneous velocity less than the modified velocity function being unsafe for take-off.
Claim 8
Independent Claim
197 words
The method of monitoring the velocity of an aircraft during ground-roll prior to take-off comprising the steps of a. determining the initial acceleration required at the commencement of the ground-roll to attain said take-off velocity and setting a function modifier in accordance with said initial acceleration, b. determining the actual instantaneous acceleration of said aircraft during ground-roll, c. displaying the initial acceleration required at the commencement of ground-roll to attain safe take-off velocity and the actual instantaneous acceleration of said aircraft, d. determining the actual instantaneous velocity of said aircraft during ground-roll, e. determining at each instant the distance travelled by said aircraft during ground-roll, f. generating a predetermined velocity function varying substantially with the distance travelled during ground-roll by said aircraft, said predetermined velocity function having a mean slope, g. modifying the mean slope of said predetermined velocity function in accordance with said initial acceleration reQuired for a safe take-off to produce a modified velocity function, h. comparing the instantaneous velocity of said aircraft with said modified velocity function, and i. indicating whether the instantaneous velocity is less than the modified velocity function, as instantaneous velocity less than the modified velocity function being unsafe for take-off.
References Cited (Backward Citations)
US3034096A
Cited
US3077110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |