基于高分辨率时频面滤波的动液面信号识别与提取  

Identification and extraction of dynamic liquid level signals based on high resolution time-frequency plane filtering

作　　者：刘彦萍 张乃禄 仵杰 高建申 王轲 LIU Yan-ping;ZHANG Nai-lu;WU Jie;GAO Jian-shen;WANG Ke(Key Laboratory of Oil and Gas Well Measurement and Control Technology of Shaanxi Province,College of Electronic Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学电子工程学院,陕西省油气井测控技术重点实验室,西安710065

出　　处：《兰州大学学报（自然科学版）》2021年第5期675-682,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金青年科学基金项目(41704106,41804115);陕西省自然科学基础研究计划项目(青年)(2018JQ4045);陕西省教育厅专项科研计划项目(19JK0665)。

摘　　要：提出采用具有高分辨特性的同步挤压小波时频变换来获得含噪动液面信号的时频分布,从时频平面上识别出动液面信号的时频能量分布并将其截取出来,采用同步挤压重构公式得到滤波后的动液面信号,根据该信号波形出现大幅突变的位置(采样点序号)和采样频率即可确定其出现的时刻点.通过与采用小波变换取得的时频平面相对比,同步挤压小波时频平面的分辨率更高,对动液面信号的识别能力更强,能够有效提取出动液面信号,更准确地获取其开始出现的位置.Adoption of synchrosqueezing wavelet time-frequency transform of high resolution characteristics is proposed to obtain the time-frequency distribution of the dynamic liquid level signals with noise,identify and extract the time-frequency energy distribution of the dynamic liquid level signal from the time-frequency plane.The filtered dynamic liquid level signal could be obtained by using the synchrosqueezing reconstruction formula.According to the abrupt position with a large amplitude of the waveform,the appearance time point could be determined.Compared with the time-frequency plane obtained by the wavelet transform,the resolution of synchrosqueezing wavelet time-frequency plane was higher,and the identification ability for the dynamic liquid level signal was superior.The position point at which the dynamic liquid level signal begins to appear could be determined more accurately.

关 键 词：动液面 识别 提取 高分辨特性 同步挤压小波时频变换 

分 类 号：TE19[石油与天然气工程—油气勘探]