Simulation analysis and experimental verification on bearings fatigue life of a centrifugal pump
In response to the issue where a centrifugal pump's actual bearing life falled lower than its design life in engineering,an IS 100-80-160 centrifugal pump was taken as the research subject,and the numerical simulation was performed.The simulation results under multiple working conditions were compared with the empirical Steponff formula for calibrating the pump's bearing life in nuclear pumps in engineering,and it was discovered that the radial force value calculated by the Steponff formula was relative small.To analyze the calculated bearing life verification error,the radial force was loaded onto the inner ring of the bearing for finite element fatigue life simulation analysis.It is discovered that both the radial force calculation error and the variation under operating conditions will result in significant bearing life deviation.This deviation is maximum under rated operating conditions and gradually de-creases as radial force increases.The safety factor is determined to be higher when comparing the com-puted results of ISO life with the simulated fatigue life.Ultimately,the centrifugal pump test bench for radial force and bearing life demonstrates that the Steponff formula's calculation value is not precise enough,which will result in a significant difference between the bearing's real life and its design life.Therefore,the application range of the Steponff formula must be taken into account when choosing large low specific speed centrifugal pump bearings.At the same time,numerical simulation can be used to verify the rated life of the pump bearing,which has some engineering significance for the large pump bearings'current life check.
万方数据
维普
