基于组合带阻滤波器与样本熵的科氏流量计挂壁故障检测方法  

A fault detection method for Coriolis flow meters based on combined band-stop filter and sample entropy

作　　者：思悦 张炎羿 王丽洁 元振毅 李淑娟[1] Si Yue;Zhang Yanyi;Wang Lijie;Yuan Zhenyi;Li Shujuan(School of Mechanical and Precision Instrument Engineering,Xi′an University of Technology,Xi′an 710048,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《仪器仪表学报》2025年第2期132-140,共9页Chinese Journal of Scientific Instrument

基　　金：陕西省重点研发计划(2023-YBGY-338)项目资助。

摘　　要：测量管故障是影响和制约科氏流量计测量精度、可靠性和安全性的关键因素。挂壁故障是科氏流量计服役过程中极易出现的测量管故障形式之一,挂壁故障的产生使科氏流量计物理刚性值发生变化,导致计量校准因子发生偏移,直接影响质量流量及其他流体信息的测量精度;另外,若挂壁故障不能及时被预警,则故障增长可能造成管道堵塞,严重时引发爆炸,造成重大工业安全事故。因此,检测科氏流量计服役状态、识别测量管挂壁故障,是提高科氏流量计测量精度、可靠性和安全性的迫切需求。故提出了一种基于组合带阻滤波器与样本熵的挂壁故障检测方法。由于振动响应信号通常包含多种模态特征信号和干扰信号。组合带阻滤波器能有效滤除干扰信号并保留目标模态特征信号。通过计算不同状态下模态特征信号的样本熵,可充分利用其对信号动态变化的高度敏感性。故障发生时,信号复杂性显著增加,样本熵值随之变化,为故障诊断和评估提供可靠依据。通过对比正常与故障状态的样本熵值,可定量分析故障严重程度,实现流量计故障状态的有效监测。实验结果表明,该方法可有效识别科氏流量计测量管的挂壁故障,且识别效果优于现有其他方法。The failure of the measurement tube is a key factor affecting and constraining the measurement accuracy,reliability,and safety of Coriolis flow meters.Wall attachment failure is one of the forms of measurement tube failure that can easily occur during the service life of Coriolis flow meters.The occurrence of wall attachment failure changes the physical rigidity of the Coriolis flow meter,leading to a shift in the calibration factor,which directly affects the measurement accuracy of mass flow and other fluid information.Furthermore,if wall attachment failure is not promptly warned,its progression may result in pipeline blockage and,in severe cases,even explosions,posing significant industrial safety risks.Therefore,detecting the service status of Coriolis flowmeters and identifying wall attachment faults in the measuring tube are urgent needs to improve the measurement accuracy,reliability,and safety of Coriolis flowmeters.To address this issue,this paper proposes a wall attachment fault detection method based on a combination of band-stop filters and sample entropy.Since vibration response signals typically contain multiple modal characteristic signals as well as interference signals,the combined band-stop filter effectively eliminates interference while preserving target modal characteristic signals.By calculating the sample entropy of modal characteristic signals under different states,the method fully utilizes its high sensitivity to dynamic signal changes.When a fault occurs,the complexity of the signal increases significantly,causing the sample entropy value to change accordingly,providing a reliable basis for fault diagnosis and evaluation.By comparing the sample entropy values of normal and faulty states,it is possible to quantitatively analyze the severity of faults,thereby achieving effective monitoring of the flow meter′s fault conditions.The experimental results indicate that this method can effectively identify the wall-hanging faults of the Coriolis flowmeter measurement tube,outperforming existin

关 键 词：科氏流量计 组合带阻滤波器 样本熵 故障检测 

分 类 号：TG806[金属学及工艺—公差测量技术] TH165.4[机械工程—机械制造及自动化]