A Method for Predicting Cumulative Fatigue Life of Pumped Storage Generator Motor Rotor Pigeon Tail Based on Grover-Manson Criterion

Abstract

Disclosed is a pumped storage power generation motor rotor pigeon tail accumulated fatigue life predicting method based on a Grover-Manson rule. The method includes: acquiring acceleration distribution as a load according to a rotor speed curve under actual running conditions provided by a pumped storage power plant, and respectively acquiring distribution conditions of stress along with time caused by centrifugal force of a power generation motor rotor pigeon tail in power generation starting condition, power generation stopping condition, motor starting condition, motor stopping condition, load shedding condition and runaway operating condition through dynamic computation; drawing a stress-time curve of a position most prone to fatigue damage in different working conditions, and calculating usable fatigue life times of the position; substituting actual occurrence times of various working conditions of a power generation motor already running for m years and fatigue life using times in the working conditions into a Grover-Manson rule calculation formula, respectively considering fatigue crack formation and fatigue crack expansion, and calculating according to crack formation and expansion to acquire fatigue life of the power generation motor rotor pigeon tail.

Description

technical field [0001] The invention discloses a method for predicting the cumulative fatigue life of the dove tail of a pumped storage generator motor rotor based on the Grover-Manson criterion, and relates to the field of fatigue life prediction of the rotor dove tail of the pumped storage power generator 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...

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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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