Analysis and Measurement of Static Deflection of Water Pump Rotor

The method of obtaining the maximum value of static deflection based on least square method curve fitting is introduced which is more accurate than the direct measurement data. The static deflection measurement data of the pump rotor were simulated using a simply supported beam as an example by adding errors in the data. The accuracy and rationality of cubic spline fitting and polynomial fitting in static deflection measurement were compared. The error might increase by using the cubic spline fitting when there are measurement errors. The error of static maximum deflection value after polynomial fitting is reduced to 27.8% of the direct measurement error, and the accuracy is better than that of the nearest measured point data instead of the static maximum deflection. The finite element simulation of pump rotor is carried out by using ANSYS in this paper to verify the feasibility.