Method and apparatus for optimizing the performance envelope of an engine
First Claim
1. A method for optimization of a performance envelope which is used during a first time between overhauls initially authorized for an existing rotorcraft engine (M) to enable said engine (M) to be used in an optimized performance envelope which is used during a second time between overhauls that is different from said performance envelope initially authorized for said engine (M), comprising:
- compensating said optimization by a change to a total service life of said engine using an apparatus that includes a meter provided with a clock and a calculatorwherein a real damage at a current instant ER3 is determined by
ER3=ER2+K2/TBO×
D2,where ER2 is the real damage at a previous instant, K2 is a deterioration coefficient of said engine between said previous and the current instant, TBO is said first time between overhauls and D2 is a duration in which a monitored temperature has resulting from a power change between said previous and the current instant; and
displaying a real damage on a display provided in a cockpit of the rotorcraft.
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Accused Products
Abstract
A method for doing an optimization of the performance envelope initially authorized for an existing rotorcraft engine (M) to enable the engine (M), to be used in an optimized performance envelope that is different from the performance envelope initially authorized for the engine, is remarquable in that this optimization is compensated by modifying the total service life of the engine (M).
14 Citations
20 Claims
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1. A method for optimization of a performance envelope which is used during a first time between overhauls initially authorized for an existing rotorcraft engine (M) to enable said engine (M) to be used in an optimized performance envelope which is used during a second time between overhauls that is different from said performance envelope initially authorized for said engine (M), comprising:
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compensating said optimization by a change to a total service life of said engine using an apparatus that includes a meter provided with a clock and a calculator wherein a real damage at a current instant ER3 is determined by
ER3=ER2+K2/TBO×
D2,where ER2 is the real damage at a previous instant, K2 is a deterioration coefficient of said engine between said previous and the current instant, TBO is said first time between overhauls and D2 is a duration in which a monitored temperature has resulting from a power change between said previous and the current instant; and
displaying a real damage on a display provided in a cockpit of the rotorcraft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for optimizing a performance envelope of a rotorcraft engine (M), comprising:
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providing an initially-authorized performance envelope comprising at least one operating rating corresponding to a given power level selected from the group consisting of a maximum takeoff power (PMD), a maximum continuous power (PMC) for a single-engine rotorcraft, a super-emergency power (PSU), a maximum emergency power (PMU) and an intermediate emergency power (PIU) for a multiengine rotorcraft, said PSU, PMU or PIU being utilized when one engine is inoperative for the multiengine rotorcraft; calculating in real time an instantaneous damage of said engine (M); and from said instantaneous damage, deducing a real damage of said engine. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for optimization of a performance envelope which is used during a first time between overhauls initially authorized for an existing rotorcraft engine (M) to enable said engine (M) to be used in an optimized performance envelope which is used during a second time between overhauls that is different from said performance envelope initially authorized for said engine (M), comprising:
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compensating said optimization by a change to a total service life of said engine, using an apparatus that includes a meter provided with a clock and a calculator wherein at instant t1, a real damage is equal to ER1, and when the engine (M) changes from power P1 to power P2 corresponding to a temperature T4 of T41, a duration D1 for when the power is at P2, t2 is an instant corresponding to an end of the duration D1, and when a power P3 is delivered from instant t2 to instant t3, a real damage ER3 at an instant t3 is determined by ER3=ER2+K2/TBO×
D2,where ER2 is the real damage at the previous instant t2, K2 is a deterioration coefficient of said engine between said previous instant and a current instant, TBO is the first time between overhauls and D2 is a duration in which a monitored temperature has a value of T42 arising from p3 resulting from a power change between said previous and the current instant.
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Specification