Method for predicting fatigue life of rotor pigeon tail part of pumped storage power generation motor based on Corten-Dolan rule

Abstract

The invention discloses a method for predicting fatigue life of a rotor pigeon tail part of a pumped storage power generation motor based on a Corten-Dolan rule. The method comprises the steps of: according to rotor speed curves provided by a pumped storage power plant under different actual operation conditions, obtaining acceleration distributions as loads, and obtaining the time-varying stress distribution situations caused by centrifugal forces of the rotor pigeon tail part of a power generation motor under a power generation starting condition, a power generation shutdown condition, an electric starting condition, an electric shutdown condition, a load shedding condition and a runaway speed operating condition; according to a maximum value of total stresses under various conditions, determining a stress maximum value under occurred conditions in combination with the occurred conditions in the known running time m years, and solving the available times of the fatigue life of the rotor pigeon tail part of a motor under the single action of the conditions; according to a Corten-Dolan rule calculation formula, obtaining a life prediction coefficient in combination with the actual number of occurrence of various conditions of a power generation motor which has been run for m years; and calculating and obtaining the use period of the fatigue life of the rotor pigeon tail part of the power generation motor according to the life prediction coefficient and the year m.

Description

technical field [0001] The invention discloses a method for predicting the fatigue life of a rotor dove tail of a pumped storage power generation motor based on the Corten-Dolan criterion, and relates to the field of prediction of the fatigue life of the rotor dove tail of a pumped storage power generation motor. Background technique [0002] Pumped-storage generator motors have two main working conditions: power generation and electric power generation, with high speed, large unit capacity, frequent start and stop of the unit, and positive and negative rotation of the rotor. At the same time, with the increase of the operating life of the pumped storage power station, the faults and accidents of the generator motor occur frequently, and the safety and stability problems become increasingly prominent. [0003] At present, there are few studies on the fatigue life prediction of the rotor pigeon tail of the pumped storage generator motor. Because the generator motor has power ...

AI Technical Summary

Problems solved by technology

The existing research method is to obtain the maximum stress distribution of each working condition through static calculation, and then use it as a load for fatigue life prediction. This method cannot reflect the change of stress distribution over time.

In addition, there is no research on the fatigue life prediction of the pumped storage generator motor rotor dove tail by calculation criteria

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