基于频谱反馈的振弦传感器自适应激励策略研究  

Research on Adaptive Excitation Strategy of Vibration Wire Sensor Based on Spectrum Feedback Information

作　　者：毛索颖 黄跃文[1,2,3] 李云友 MAO Suoying;HUANG Yuewen;LI Yunyou(Changjiang River Scientific Research Institute,Yangtze River Water Resources Commission of the Ministry of Water Resources,Wuhan Hubei 430010,China;Research Center on Water Engineering Safety and Disaster Prevention of MWR,Wuhan Hubei 430010,China;Research Center on National Dam Safety Engineering Technology,Wuhan Hubei 430010,China;State Key Laboratory for Health and Safety of Bridge Structures,Wuhan Hubei 430034,China;China Railway Bridge Science Research Institute,Ltd.,Wuhan Hubei 430034,China)

机构地区：[1]长江水利委员会长江科学院,湖北武汉430010 [2]水利部水工程安全与病害防治工程技术研究中心,湖北武汉430010 [3]国家大坝安全工程技术研究中心,湖北武汉430010 [4]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [5]中铁大桥科学研究院有限公司,湖北武汉430034

出　　处：《传感技术学报》2023年第4期522-528,共7页Chinese Journal of Sensors and Actuators

基　　金：长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2019394/GC);基于MEMS智能传感器和LoRa窄带通信的变形监测预警系统研发及应用项目(JG/20016B);国家重点研发计划项目(2022YFC3005503)。

摘　　要：振弦式传感器的激励是保证振弦传感器可靠测量的前提。针对工程中因振弦传感器激励不可靠导致的测量问题,开展了激励效果影响因素的分析与实验研究;根据低压扫频激励方式涉及的激励波形、激励步长、激励范围、激励次数等影响因素分析和实验结果,设计了预激励、分段激励和复激励三阶段,结合基于FFT的频谱测频方法,形成激励输入与测量结果输出的闭环反馈和评价机制,实现了振弦传感器的自适应激励;以卡槽式结构的振弦式应变传感器为例,证实了所提出的激励策略相较于其他策略,可有效改善振弦传感器的激励质量,提高振弦传感器测量的可靠性和准确性。The vibration excitation is the key to ensure the reliable measurement of the vibrating wire sensor.Aiming at the problem that the vibrating wire sensor measurement is not reliable due to the unreliability of excitation in engineering,analysis and experimental stud⁃ies on the influencing factors of excitation effect are performed.According to the research of the influencing factors such as excitation waveform,excitation step,excitation range and excitation times involved in low⁃voltage frequency sweep excitation,three stages are de⁃signed to realize the self⁃adaptive excitation of the vibrating string sensor i.e.,pre⁃excitation,segmented excitation and compound excita⁃tion.Combined with the frequency measurement method based on FFT,the closed⁃loop feedback and evaluation mechanism of excitation input and measurement result output is formed,realizing the adaptive excitation of vibration wire sensor.Experimental results show that the proposed excitation strategy can effectively improve the excitation quality and the reliability and accuracy of the measurement com⁃pared with other strategies.

关 键 词：振弦式传感器 激励策略 自适应 频谱分析 扫频激励 大坝安全监测 FFT 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]