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US 4,051,720 AGranted
Engine useful life measuring device
AssigneeRolls-Royce (1971) Limited
InventorClive Seymour Barrington
Life of this patent
Estimating the term…
Abstract
The useful life of rotating machines is used up depending upon the load which the machine has to bear. In some machines it is necessary to measure the usage of the machine life and the present invention provides a device for doing this. In the described embodiment the device is applied to a gas turbine engine in which measurement of speed changes between certain speed levels is used to indicate the life usage.
Claims5
A device for measuring the use of the useful life of a rotating machine, comprising means for generating a signal having a characteristic related to a variable load of the machine;
- a plurality of detectors each responsive to a different level of said characteristics of said signal, the said detectors comprising a first set of detectors which respond to lower levels of said characteristic and a second set of detectors which respond to higher levels of said characteristic, the means for generating the count being associated only with the second set of detectors;
- means for generating a count which means is associated with said detectors and arranged to generate a count when the characteristic of said signal changes between predetermined levels of said characteristic consequent upon a corresponding machine load change;
- and means for summating successive counts generated by said means thereby to give an indication of the usage of said useful life.
Dependencies are inferred from the claim text.