Shaft break detection
First Claim
1. A method of detecting shaft break in a shaft system comprising a shaft coupled between two masses, the method comprising steps to:
- define a time-dependent rotational speed equation for the shaft in terms of system inertia for an engine transient event;
discretize the rotational speed equation in terms of a discrete time constant in a discrete domain;
recursively define the discretized equation to give a recursive equation;
solve the recursive equation to determine the discrete time constant;
define a threshold as a function of engine power, wherein the threshold is a value of the discrete time constant calculated as the function of engine power; and
set a shaft break detection signal to TRUE and reduce or stop a drive to the shaft if the discrete time constant is less than the threshold.
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Abstract
The present invention provides a method of detecting shaft break in a shaft system comprising a shaft coupled between two masses. The method comprises a number of steps. Firstly, to define a time-dependent rotational speed equation for the shaft in terms of system inertia for an engine transient event. Then to discretize the rotational speed equation in terms of a discrete time constant in the discrete domain. Then to recursively define the discretized equation to give a recursive equation and to solve the recursive equation to determine the discrete time constant. Then to define a threshold as a function of engine power and then to set a shaft break signal to TRUE if the discrete time constant is greater than the threshold. A shaft break detection system is also provided by the present invention.
8 Citations
18 Claims
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1. A method of detecting shaft break in a shaft system comprising a shaft coupled between two masses, the method comprising steps to:
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define a time-dependent rotational speed equation for the shaft in terms of system inertia for an engine transient event; discretize the rotational speed equation in terms of a discrete time constant in a discrete domain; recursively define the discretized equation to give a recursive equation; solve the recursive equation to determine the discrete time constant; define a threshold as a function of engine power, wherein the threshold is a value of the discrete time constant calculated as the function of engine power; and
set a shaft break detection signal to TRUE and reduce or stop a drive to the shaft if the discrete time constant is less than the threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A shaft break detection system comprising:
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a shaft coupled between two masses; at least one sensor to sample rotational speed of the shaft; a processor to process the sampled speed to recursively solve a discretised rotational speed equation to determine a discrete time constant; a processor to determine a threshold as a function of engine power, wherein the threshold is a value of the discrete time constant calculated as the function of engine power; and
a comparator to set a shaft break detection signal to TRUE in order to reduce or stop a drive to the shaft if the discrete time constant is less than the threshold. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification