Comprehensive evaluation method for flow-induced vibration performance of pump

摘要

A comprehensive evaluation method for pump flow induced vibration performance: first, utilizing an experimental test or value to produce by calculation pressure pulsation data at a pump impeller outlet and to calculate a dimensionless pressure pulsation coefficient time-domain transformation function; then, performing a fast Fourier transformation with respect to the time-domain transformation function to acquire a frequency-domain transformation function, then performing a full frequency domain search, arranging in a descending order according to amplitude and selecting the first three frequency points to serve as calculation frequency points; then, employing a analytic hierarchy process to determine weight factors of the amplitudes of the calculation frequency points in a pump flow inducted vibration overall evaluation, and finally, by means of a calculation with respect to the amplitudes of the calculation frequency points and the corresponding weight factors, acquiring a third-order comprehensive vibration pressure of a pump to evaluate the overall vibration level of the pump. The method takes into comprehensive consideration the amplitudes of a pump impeller outlet pressure pulsation transformation function on multiple frequency points, overcomes the lopsidedness in the past where only the vibration amplitude at a main frequency is taken into consideration in evaluating pump vibration performance, and has broad engineering application values.