基于wMPS测量刚性结构振动频率的可行性研究  

Feasibility of measuring vibration frequency of rigid structure based on wMPS

作　　者：熊春宝[1] 白洪志 王猛[1] XIONG Chunbao;BAI Hongzhi;WANG Meng(School of Civil Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《振动与冲击》2021年第19期41-47,58,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51775380)。

摘　　要：工作空间定位系统(wMPS)是一种基于光电扫描的新型网络式大尺寸三维坐标测量系统,具有精度高、动态性好、并行测量的优势,是针对工业测量中大尺度结构开发的仪器。针对全球卫星导航系统(GNSS)、自动全站仪(RTS)等大地测量设备无法完全满足人形天桥等小型刚性结构的固有参数测量的问题,把wMPS引入结构健康监测领域中。采用逆向工程法建立试验台模拟结构振动频率,应用快速傅里叶变换(FFT)分析随时间序列变化获取的位移数据来确定wMPS测量结构固有参数的可行性及其测量范围,并采用GNSS-RTK进行对比试验分析。试验结果表明,wMPS能识别结构固有参数,当位移幅值大于3 mm小于30 mm时可以识别到4 Hz的频率,为相对刚性结构健康监测提供了新的参考途径。The workspace measurement positioning system(wMPS)is a new network type large-scale 3D coordinate measurement system based on photoelectric scanning.It has advantages of high precision,good dynamic performance and parallel measurement.It is an instrument developed for large-scale structure in industrial measurement.Here,aiming at the problem of global navigation satellite system(GNSS),robotic total stations(RTS)and other geodesy equipment being not able to fully meet the measurement of inherent parameters of small rigid structures,such as,footbridges,wMPS was introduced into the field of structural health monitoring.The reverse engineering method was used to establish a test platform to simulate vibration frequency of a structure.The fast Fourier transform(FFT)was used to analyze displacement data obtained with variation of time series,and determine the feasibility and measurement range of wMPS for measuring structure inherent parameters.GNSS-RTK was used for contrastive test analysis.The test results showed that wMPS can be used to identify structure inherent parameters,and identify frequencies within the range of 0-4 Hz when displacement amplitude is within the range of 3-30 mm;the study results can provide a new reference for health monitoring of relatively rigid structures.

关 键 词：工作空间定位系统(wMPS) 固有频率 健康监测 刚性结构 

分 类 号：TH761[机械工程—仪器科学与技术] TU196.4[机械工程—精密仪器及机械]