Research on Dynamic Stress Testing and Fatigue of Head Cover Bolt in High Head Pumped Storage Unit
During the operation of the water pump turbine,due to vibration transmission,the top cover bolts are subjected to cyclic alternating stress,which may result in fatigue fracture caused by the dynamic stress on the bolts.Based on a high head pumped storage power station project,combined with the structural design and on-site operation of the pump turbine,the dynamic stress of the top cover bolts under different working conditions was tested.Finite element analysis software was used to comprehensively analyze the dynamic stress of the bolts.Then,based on the theory of fatigue cumulative damage,the rainflow counting method was used to statistically calculate the results.Combined with the S-N curve of the bolts,fatigue damage analysis based on dynamic stress was carried out to obtain the fatigue damage of the top cover bolts.
pumped turbine unithead cover boltfinite element analyzedynamic stressfatigue
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