LIFING AND PERFORMANCE OPTIMIZATION LIMIT MANAGEMENT FOR TURBINE ENGINE
First Claim
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1. A control for a turbine engine system comprising a plurality of components including a multi-shaft turbine engine and one or more electrical machines coupled to the shafts of the turbine engine, the control comprising:
- a constraint analyzer to determine applicable component limits based on current operating conditions of the turbine engine system, wherein each of the component limits defines an operating region in which, if the component limit is exceeded, the life or safety of the component may be compromised; and
a limit management optimizer to generate a desired operating point and one or more possible operating points for the system based on the current operating conditions, the applicable component limits, and an optimization objective, wherein the one or more possible operating points each represents a functional trade-off involving a reduction in a component function to maintain the component limits, an objective trade-off involving a modification of the optimization objective to maintain the component limits, or a modification of one or more of the component limits.
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Abstract
A control for a multi-shaft turbine engine system using electrical machines seeks optimal system performance while accommodating hard and soft component limits. To accommodate the component limits, the control may generate a number of possible operating point options reflecting potential trade-offs in performance, lifing, efficiency, or other objectives.
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Citations
17 Claims
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1. A control for a turbine engine system comprising a plurality of components including a multi-shaft turbine engine and one or more electrical machines coupled to the shafts of the turbine engine, the control comprising:
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a constraint analyzer to determine applicable component limits based on current operating conditions of the turbine engine system, wherein each of the component limits defines an operating region in which, if the component limit is exceeded, the life or safety of the component may be compromised; and a limit management optimizer to generate a desired operating point and one or more possible operating points for the system based on the current operating conditions, the applicable component limits, and an optimization objective, wherein the one or more possible operating points each represents a functional trade-off involving a reduction in a component function to maintain the component limits, an objective trade-off involving a modification of the optimization objective to maintain the component limits, or a modification of one or more of the component limits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling the allocation of power extracted from a plurality of shafts of a turbine engine during operation of the turbine engine, the shafts having one or more electrical machines coupled thereto, the method comprising:
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analyzing current operating conditions of the turbine engine; determining a optimization objective, the optimization objective being defined to maximize one of performance, efficiency, component lifing, reliability, and stability of the turbine engine; determining a component limit based on the current operating conditions, the component limit relating to a component of the turbine engine; determining a desired operating point for the turbine engine based on the current operating conditions and the optimization objective, determining whether the desired operating point violates the component limit; and determining one or more possible operating points for the turbine engine, each of the possible operating points representing one of a functional trade-off involving a reduction in the operation of a component of the turbine engine to maintain the component limit, an objective trade-off involving a modification of the optimization objective to maintain the component limit, and a modification of the component limit. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A system for controlling the allocation of power between or among electrical machines of a turbine engine, the system comprising:
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a low pressure turbine, coupled to the turbine engine via a low pressure shaft; a high pressure turbine, coupled to the turbine engine via a high pressure shaft; electrical machines coupled to the low pressure shaft and the high pressure shaft, the electrical machines configured to extract rotational power from the low pressure shaft and the high pressure shaft and output electrical power; controllers coupled to each of the electrical machines to control the amount of rotational power extracted by the electrical machines; and a limit management optimizer to, during operation of the turbine engine, adjust the allocation of power extraction between or among the electrical machines to achieve an operating point based on current operating conditions of the turbine engine, an optimization objective for the turbine engine, and a component limit of a component of the system.
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17. (canceled)
Specification