排灌机械工程学报2026，Vol.44Issue(4)：331-339,9.DOI:10.3969/j.issn.1674－8530.24.0063
基于Hankel－DMD的立式混流泵压力脉动特性分析
Analysis of pressure pulsation characteristics of vertical mixed-flow pumps based on Hankel－DMD
摘要
Abstract
To ensure the safe operation of vertical mixed-flow pumps in low-head pumping stations,it is necessary to accurately identify the pressure pulsations in the vaneless space.Based on numerical simulation results,time-series data was constructed and a dynamic mode decomposition approach en-hanced by the delayed-embedding property of the Hankel matrix was employed to enable the extraction of dominant dynamic features from one-dimensional signals.The frequency components obtained from this method were compared with those derived from Fourier transform analysis to verify identification accuracy.Three typical flow conditions were examined to analyze the dominant frequencies,energy dis-tribution,and modal characteristics of pressure pulsations in the vaneless region.Signal reconstruction using a limited number of low-order modes was conducted to evaluate error levels and the stability of the method.The results show that the proposed approach effectively identifies the primary frequencies induced by rotor－stator interaction and outperforms the Fourier transform in extracting low-energy com-ponents.The low-order reconstruction maintains a high degree of consistency with the original signal,demonstrating good error control.The study concludes that this method can accurately characterize pressure pulsation characteristics of the vaneless region of vertical mixed-flow pumps,and provides valuable technical support for analyzing complex time-series data and assessing the operational safety of pumping stations.关键词
立式混流泵/压力脉动/快速傅里叶变换/动态模态分解/数值模拟Key words
vertical mixed-flow pump/pressure pulsation/fast Fourier transform/dynamic mode decomposition/numerical simulation分类
农业科技引用本文复制引用
乔凤权,孙毅,吴延昭,陈北帅,陶然,肖若富..基于Hankel－DMD的立式混流泵压力脉动特性分析[J].排灌机械工程学报,2026,44(4):331-339,9.基金项目
国家自然科学基金资助项目(52079142,52509134) （52079142,52509134）
