基于希尔伯特—黄变换的过闸水流脉动压力时频特性分析  

Time-frequency Characteristics Analysis of Pulsating Pressure of Water Flow Through Gate Based on Hilbert-Huang Transform

作　　者：张蕊 沈春颖[1] 马江霞 ZHANG Rui;SHEN Chun-ying;MA Jiang-xia(School of Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Huaneng Lancang River Hydropower Inc.,Kunming 650214,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]华能澜沧江水电股份有限公司,云南昆明650214

出　　处：《水电能源科学》2023年第5期174-177,共4页Water Resources and Power

基　　金：国家自然科学基金项目(52069009);昆明理工大学引进人才科研启动基金项目(KKSY201904008)。

摘　　要：平面闸门通过启闭控制蓄水和泄水,在运作时容易受水流脉动压力作用而发生破坏。为研究闸门启闭运动与过闸水流的相互作用过程,首先对不同底缘形式下的闸门启闭过程中过闸水流进行三维数值模拟,再采用希尔伯特—黄变换对过闸水流脉动压力信号进行时频特性分析,得到信号的时间—频率—幅值信息,对比分析发现在前倾45°、后倾30°的组合式闸门底缘,在闸门底部受脉动压力作用较平缓,测点能量幅值的变化差值最小,水流流态较为稳定。该研究可为平面闸门过闸水流脉动压力分析提供参考。The plane gate controls water storage and discharge by opening and closing,and is easily damaged by the pulsating pressure of the water flow during operation.In order to study the interaction process between the opening and closing motion of the gate and the flow through the gate,this paper firstly conducted a three-dimensional numerical simulation of the flow through the gate during the opening and closing process of the gate under different bottom edge forms.And then the Hilbert-Huang transform was used to analyze the flow through the gate,and the time-frequency-amplitude information of the signal.The information analysis and comparison found that the bottom edge of the combined gate with a forward tilt of 45°and a backward tilt of 30°is gently affected by the pulsating pressure at the bottom of the gate,and the change difference of the energy amplitude at the measuring point was the smallest,and the water flow state was relatively stable.This study can provide a reference for the analysis of the pulsating pressure of the water flow through the plane gate.

关 键 词：平面闸门 闸门底缘 脉动压力 希尔伯特—黄变换 时频特性分析 

分 类 号：TV131[水利工程—水力学及河流动力学]