基于MicroPython的结构应变采集系统设计  

Design of Structural Strain Acquisition System Based on MicroPython

作　　者：王立新[1,2] 王雨松 李储军 汪珂[1,2] 王超[3] WANG Lixin;WANG Yusong;LI Chujun;WANG Ke;WANG Chao(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an Shaanxi 710043,China;School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an Shaanxi 710048,China;School of Information Engineering,Chang’an University,Xi’an Shaanxi 710064,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043 [2]西安理工大学土木建筑工程学院,陕西西安710048 [3]长安大学信息工程学院,陕西西安710064

出　　处：《电子器件》2024年第4期884-890,共7页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(52078421);陕西省“特支计划”青年拔尖人才项目(陕组通字[2018]33号);中铁一院科研项目(院科19-40)。

摘　　要：为了解决现有应变数据采集设备测量通道单一以及测量精度低的问题,结合MicroPython语言设计了基于振弦式传感器的应变采集系统。该系统能够同步获取4路应变和温度数据,并对4路应变与温度数据进行组间融合;通过宽度学习系统BLS拟合应变量与温度的线性关系对融合后的应变数据进行温度补偿,提高系统的监测精度,细化系统的场景分析。依托北京宣武门地铁基坑钢梁结构进行实地监测分析,结果表明,相较于实测应变数据和利用小波分解-最小二乘法补偿的应变数据,该系统提出的融合补偿算法得到应变数据的标准差分别降低了31.6%和25.4%,该系统能实时捕获更加准确的应变量,为结构应变高精度感知提供有效途径。In order to solve the problems of single channel measurement and low accuracy measurement of existing strain data acquisition equipment,a strain acquisition system based on vibration wire strain sensor is designed with MicroPython language.Firstly,the system can synchronously acquire four channels of strain and temperature data,and perform inter-group fusion of the four channels of strain and temperature data.Then,linear relationship between strain and temperature fitted by broad learning system(BLS)is used to compensate the temperature disturbance of the fused strain data,which improves the measurement accuracy of the system and details the scene analysis.Finally,realistic monitoring analysis of a steel beam in the foundation pit of Beijing Xuanwumen subway station is performed,the strain data obtained by using the fusion compensation algorithm proposed are acquired,with standard deviation reduced by 31.6%and 25.4%respectively compared with the measured strain data and the strain data compensated by wavelet decomposition and least square method.The system can dynamically capture more accurate strain data synchronously and provide an effective method for high precision sensing of structural strain.

关 键 词：MicroPython 应变采集系统 数据融合 温度补偿 

分 类 号：TN98[电子电信—信息与通信工程]