Generator rotor crack propagation prediction system and operation conditions determination support system, method, and program, and operation control system
First Claim
1. A generator rotor crack propagation prediction system, comprising:
- memory means;
interface means that inputs data and outputs results;
stress calculation means that calculates the mean stress in a generator rotor shaft dovetail and stores the stress in the memory means;
factor range calculation means that calculates the stress intensity factor range of shaft dovetail crack and stores the stress intensity factor range in the memory means; and
crack propagation amount calculation means that calculates an amount of the shaft dovetail crack propagation from the mean stress and stress intensity factor range stored in the memory means, and crack data.
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Abstract
An object of the present invention is to control crack propagation, either by predicting shaft dovetail crack propagation with high accuracy, or by determining operation conditions under which the crack does not extend. The crack propagation prediction system includes an operation processing unit, an interface unit, and a memory unit. The operation processing unit includes a stress calculation unit that calculates the mean stress generated in the shaft dovetail, a factor range calculation unit that calculates the stress intensity factor range for the crack in the shaft dovetail, and a crack propagation amount calculation unit that calculates an amount of the shaft dovetail crack propagation for an arbitrary time period, from the obtained mean stress and the stress intensity factor range, an operation pattern, an operation time, and data on the crack. The stress calculation unit includes as individual calculation units that calculate separately different types of mean stress, a contact surface pressure stress calculation unit, a thermal stress calculation unit, and a residual stress calculation unit, as well as a mean stress calculation unit that sums these mean stresses.
12 Citations
15 Claims
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1. A generator rotor crack propagation prediction system, comprising:
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memory means;
interface means that inputs data and outputs results;
stress calculation means that calculates the mean stress in a generator rotor shaft dovetail and stores the stress in the memory means;
factor range calculation means that calculates the stress intensity factor range of shaft dovetail crack and stores the stress intensity factor range in the memory means; and
crack propagation amount calculation means that calculates an amount of the shaft dovetail crack propagation from the mean stress and stress intensity factor range stored in the memory means, and crack data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11)
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8. A generator rotor operation conditions determination support system, comprising:
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memory means;
interface means that inputs data and outputs results;
factor range calculation means that calculates and stores in the memory means the stress intensity factor range for a crack generated in the shaft dovetail, based on the size, position, and shape of the crack in the shaft dovetail;
operation limitation value calculation means that calculates as an operation limiting value that determines operation conditions and stores in the memory means the mean stress at which the crack does not extend corresponding to the stress intensity factor range stored in the memory means, based on material lower bound stress intensity factor range data; and
operation pattern determination means that determines an operation pattern in which the crack does not extend, based on the operation limiting value stored in the memory means, and using mean stress data created from various types of operation pattern. - View Dependent Claims (9)
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12. A generator rotor crack propagation prediction method for predicting generator rotor shaft dovetail crack propagation using operation processing means that carries out calculations to predict crack propagation, memory means that stores calculation results, and interface means that receives data input and outputs results, the method comprising the steps of:
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calculating the mean stress in the shaft dovetail using the calculation means;
calculating the stress intensity factor range for a crack in the shaft dovetail;
calculating and storing in the memory means an amount of the shaft dovetail crack propagation from the obtained mean stress and stress intensity factor range, and crack data; and
displaying the obtained calculation result using the interface means.
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13. A generator rotor operation conditions determination support method for determining generator operation conditions to suppress generator rotor shaft dovetail crack propagation, using operation processing means that carries out calculations to determine operation conditions, memory means that stores calculation results, and interface means that receives data input and outputs results, the method comprising the steps of:
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calculating the stress intensity factor range for a shaft dovetail crack, based on the size, position, and shape of the shaft dovetail crack using the calculation means;
calculating the mean stress at which the crack does not extend corresponding to the obtained stress intensity factor range as an operation limiting value that determines the operation conditions, based on material lower bound stress intensity factor range data;
determining and storing in the memory means the operation pattern in which the crack does not extend, based on the obtained operation limiting value, using mean stress data created from various types of operation pattern; and
displaying the obtained calculation result using the interface means.
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14. A generator rotor crack propagation prediction program that predicts generator rotor shaft dovetail crack propagation using a computer, the program causing the computer to implement:
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a stress calculation function that calculates the mean stress generated in a shaft dovetail;
a factor range calculating function that calculates the stress intensity factor range for a crack generated in a shaft dovetail; and
a crack propagation amount calculation function that calculates an amount of the shaft dovetail crack propagation, from the obtained mean stress and stress intensity factor range, and crack data.
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15. A generator rotor operation conditions determination support program that determines generator operation conditions to suppress generator rotor shaft dovetail crack propagation using a computer, the program causing the computer to implement:
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a factor range calculation function that calculates the stress intensity factor range for a crack generated in a shaft dovetail based on the size, position, and shape of the shaft dovetail crack;
an operation limiting value calculation function that calculates the mean stress at which the crack does not extend corresponding to the obtained stress intensity factor range as an operation limiting value that determines the operation conditions, based on material lower bound stress intensity factor range data; and
an operation pattern determining function that determines an operation pattern in which the crack does not extend, based on the obtained operation limiting value, using mean stress data created from various types of operation pattern.
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Specification