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首页> 外文期刊>Electric Power Components and Systems >Fatigue Life Prediction of Rotor Slot-Dovetails in Pumped Storage Generator/Motor Considering Transient Loading
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Fatigue Life Prediction of Rotor Slot-Dovetails in Pumped Storage Generator/Motor Considering Transient Loading

机译：考虑瞬时载荷的抽水蓄能发电机/电动机转子槽燕尾榫的疲劳寿命预测

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摘要

For fatigue life prediction, the maximum stress calculated by the structural static analysis is used as load calculation in normal continuous operating conditions, which is not valid in time-varying performing situations. This article proposes a fatigue life prediction method considering repetitive time-varying and asymmetrical stresses as a stress spectrum for calculation loading to predict the accumulative fatigue life for the rotor slot-dovetails of the pumped storage generator/motor (PSGM) under multiple transient situations. The structural transient analysis is performed to calculate the time-varying stress caused by the centrifugal force. Then, the total stress is obtained by superimposing the centrifugal stress with the thermal stress caused by temperature difference, which is used as the loads for fatigue life calculations. Through fatigue life calculation in each condition, the numbers of cycles to failure and the initial sites of impending failures are determined. By the cumulative fatigue damage rule, the practical operating data is to predict the service life. By this prediction method, the fatigue fracture sites are in the slot-dovetail, and the minimum service life is estimated.
机译：对于疲劳寿命预测，通过结构静态分析计算出的最大应力用作正常连续运行条件下的载荷计算，这在时变的执行情况下无效。本文提出了一种疲劳寿命预测方法，该方法将反复时变和非对称应力作为应力谱，用于计算负荷，以预测抽水蓄能发电机组/电动机（PSGM）在多个瞬态情况下转子槽燕尾的累积疲劳寿命。进行结构瞬态分析以计算由离心力引起的随时间变化的应力。然后，通过将离心应力与温度差引起的热应力相叠加来获得总应力，该总应力被用作疲劳寿命计算的载荷。通过计算每种情况下的疲劳寿命，可以确定故障循环次数和即将发生故障的初始位置。根据累积疲劳损伤规则，实际运行数据将预测使用寿命。通过这种预测方法，疲劳断裂部位位于槽楔形榫中，并估计了最小使用寿命。

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