System and method of determining centrifugal turbomachinery remaining life
First Claim
1. A turbomachine comprising:
- an impeller;
a speed sensor arranged to detect a speed associated with an impeller speed;
a temperature sensor arranged to detect a temperature associated with an impeller exit temperature;
a controls system having impeller parameters including impeller speed and exit temperature, a calculation methodology mathematically manipulating the impeller parameters to determine a remaining life of the impeller, and a programmed response triggered by the controls system in response to the remaining life reaching a threshold; and
wherein the impeller parameters include stress characteristics of the impeller having fatigue strength modification factors including at least one of impeller surface finish, load on an impeller area, and size of an impeller feature.
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Accused Products
Abstract
A centrifugal turbomachine includes an impeller and a speed sensor arranged to detect a speed associated with an impeller speed. A temperature sensor is arranged to detect a temperature associated with an impeller exit temperature. A controls system has impeller parameters, which includes the impeller speed and exit temperature. A calculation methodology is used to mathematically manipulate the impeller parameters to determine a remaining life of the impeller. A program response, such as a warning indication, is triggered by the control system in response to the remaining life reaching a threshold. The controls system monitors the speed and temperature of the impeller. The controls system internally calculates the remaining life based upon the speed and the temperature. In one example, a change in remaining life is calculated in response to a change in speed that results in an impeller stress that exceeds an endurance strength for the impeller.
39 Citations
16 Claims
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1. A turbomachine comprising:
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an impeller; a speed sensor arranged to detect a speed associated with an impeller speed; a temperature sensor arranged to detect a temperature associated with an impeller exit temperature; a controls system having impeller parameters including impeller speed and exit temperature, a calculation methodology mathematically manipulating the impeller parameters to determine a remaining life of the impeller, and a programmed response triggered by the controls system in response to the remaining life reaching a threshold; and wherein the impeller parameters include stress characteristics of the impeller having fatigue strength modification factors including at least one of impeller surface finish, load on an impeller area, and size of an impeller feature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of calculating impeller remaining life comprising the steps of:
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a) monitoring a speed of an impeller; b) monitoring a temperature associated with the impeller; c) iteratively calculating a remaining life of the impeller based upon a change in the speed and the temperature; d) producing a warning indication when the remaining life reaches a threshold; and e) avoiding an undesired change in speed when the remaining life reaches the threshold. - View Dependent Claims (10, 11, 12, 13)
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14. A turbomachine comprising:
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an impeller; a speed sensor arranged to detect a speed associated with an impeller speed; a temperature sensor arranged to detect a temperature associated with an impeller exit temperature; and a controls system having impeller parameters including impeller speed and exit temperature, a calculation methodology mathematically manipulating the impeller parameters to determine a remaining life of the impeller based upon changes in the impeller speed, and a programmed response triggered by the controls system in response to the remaining life reaching a threshold, the programmed response including avoidance of undesired changes in the impeller speed. - View Dependent Claims (15, 16)
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Specification