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Method and device for predicting and monitoring high-cycle fatigue life of turbine welded rotor

A technique for welding rotors, high cycle fatigue, used in mechanical equipment, engine components, machines/engines, etc.

Active Publication Date: 2014-08-20
SHANGHAI POWER EQUIP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods for predicting and monitoring the life of steam turbine rotors provide a method for predicting and monitoring the low-cycle fatigue life of steam turbine welded rotors. For the prediction and monitoring of high-cycle fatigue life of steam turbine welded rotors, there is no suitable method and device available. use

Method used

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  • Method and device for predicting and monitoring high-cycle fatigue life of turbine welded rotor
  • Method and device for predicting and monitoring high-cycle fatigue life of turbine welded rotor
  • Method and device for predicting and monitoring high-cycle fatigue life of turbine welded rotor

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Embodiment

[0079] Such as figure 1 As shown, a block diagram of a high-cycle fatigue life monitoring device for a steam turbine welded rotor of the present invention. The high-cycle fatigue life device for a steam turbine welded rotor of the present invention is composed of an ultrasonic flaw detector 1 and a calculation server 2. The ultrasonic flaw detector 1 and a steam turbine welded rotor and a calculation server 2Connect.

[0080] Such as figure 2 As shown, the flow chart of the method for monitoring the high-cycle fatigue life of a steam turbine welded rotor of the present invention, such as image 3 As shown, the computer software block diagram adopted by the calculation server of the present invention is written in C language, installed on the calculation server of the high cycle fatigue life of the steam turbine welded rotor, and applied to the calculation and control of the high cycle fatigue life of the steam turbine welded rotor.

[0081] For a certain model of 300MW thermal pow...

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Abstract

The invention relates to a method and device for predicting and monitoring the high-cycle fatigue life of a turbine welded rotor. The method for monitoring the high-cycle fatigue life of a turbine welded rotor consists of specific steps of: determining, through flaw detection, the crack size of a welding rotor of the turbine, determining a fatigue crack extensional stress strength factor threshold value delta KthR, distinguishing the possibility of the crack fatigue extension of the welded rotor of the turbine, calculating the maximum stress sigma max of the high cycle fatigue of welded rotor of the turbine, the critical size ac of the welded rotor of the turbine, the life circulation times of the high cycle fatigue of the turbine rotor, the average high cycle fatigue circulation times ey of the welded rotor of the turbine, the life year of the high cycle fatigue of the welded rotor of the turbine, and controlling the safety of the life of the high cycle fatigue of the welded rotor of the turbine. Through the invention, quantitative prediction and quantitative monitoring of the high-cycle fatigue life of a turbine welded rotor are realized.

Description

Technical field [0001] The invention relates to a method and a device for predicting and monitoring the high-cycle fatigue life of a steam turbine welded rotor, and belongs to the technical field of steam turbines. Background technique [0002] In the steady-state rated load operation of the steam turbine, due to the centrifugal load and thermal load, the stable static stress generated in the steam turbine welded rotor is called the average stress. The static long-span, hundreds of tons of steam turbine welded rotor, under its own gravity load, produces compressive stress on the outer surface of the welded rotor above the center of gravity, and tensile stress on the outer surface of the welded rotor below the center of gravity. In the operation of the steam turbine, a certain point on the outer surface of the welded rotor, in addition to the stable average stress generated by the centrifugal load and thermal load, when the point rotates to the top of the welded rotor (90° positio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D21/00
Inventor 史进渊邓志成汪勇杨宇华浩磊
Owner SHANGHAI POWER EQUIP RES INST
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