基于压力变送器的主梁挠度监测系统动态性能研究
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摘要
为研究基于压力变送器的竖向位移监测系统进行动态位移监测的适用性,以桥梁健康监测中常用的主梁挠度监测系统为对象,采用正弦波位移加载方式,研究影响监测系统位移振幅比的因素,并根据一阶系统传递函数分析其时滞常数和幅频曲线。结果表明:水管长度、水管材质、水柱高度、位移幅值对位移振幅比的影响很小,加载频率是主要影响因素;时滞常数随被测点竖向位移动态频率的增大而增大,频率不大于0.2Hz时,时滞常数可按13.3s取值;要求振幅比不小于0.95时,频率不应大于0.025Hz。
To study the applicability of a vertical displacement monitoring system based on pressure transmitter for monitoring the dynamic displacement,taking a monitoring system for monitoring the deflection of main girder which is commonly adopted in bridge health monitoring(BHM)as an object,we investigated the influence factors on amplitude ratio of the monitoring system by adopting a sinusoidal displacement loading method.Moreover,we analyzed the time-lag constant and frequency-amplitude curve according to the transfer function of a first-order system.The results show that the predominate influential factor is loading frequency,and other factors,such as pipe length,pipe material,water column′s height and displacement value,have limited effects.The time-lag constant will increase as the dynamic frequency of vertical displacement at the measured spot increases.When the loading frequency is not higher than 0.2 Hz,the time-lag constant can be taken as 13.3 s.The loading frequency should not be higher than 0.025 Hz when the amplitude ratio is not less than 0.95.
To study the applicability of a vertical displacement monitoring system based on pressure transmitter for monitoring the dynamic displacement,taking a monitoring system for monitoring the deflection of main girder which is commonly adopted in bridge health monitoring(BHM)as an object,we investigated the influence factors on amplitude ratio of the monitoring system by adopting a sinusoidal displacement loading method.Moreover,we analyzed the time-lag constant and frequency-amplitude curve according to the transfer function of a first-order system.The results show that the predominate influential factor is loading frequency,and other factors,such as pipe length,pipe material,water column′s height and displacement value,have limited effects.The time-lag constant will increase as the dynamic frequency of vertical displacement at the measured spot increases.When the loading frequency is not higher than 0.2 Hz,the time-lag constant can be taken as 13.3 s.The loading frequency should not be higher than 0.025 Hz when the amplitude ratio is not less than 0.95.
引文
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[2]王翔,王波,汪正兴.高速铁路运营期基础沉降长期监测技术研究[J].铁道工程学报,2017,34(5):11-14.(WANG Xiang,WANG Bo,WANG Zheng-xing.Research on the Long-Term Monitoring Technology of Subgrade Settlement for High-Speed Railway in Operation Period[J].Journal of Railway Engineering Society,2017,34(5):11-14.in Chinese)
[3]荆国强,王波,柴小鹏,等.高速铁路桥梁动力响应监测数据分析方法及其应用[J].桥梁建设,2018,48(2):31-36.(JING Guo-qiang,WANG Bo,CHAI Xiao-peng,et al.Analysis Method and Its Application of Dynamic Response Monitoring Data of High-Speed Railway Bridges[J].Bridge construction,2018,48(2):31-36.in Chinese)
[4]朱世峰,汪正兴.液气耦合式结构竖向位移测量系统精度及误差分析[J].世界桥梁,2015,43(2):55-59.(ZHU Shi-feng,WANG Zheng-xing.Precision and Error Analysis of Liquid-Air Coupling Structural Vertical Displacement Measuring System[J].World Bridges,2015,43(2):55-59.in Chinese)
[5]何先龙,杨学山,赵立珍.一种新的高速铁路桥梁动挠度测试方法[J].测控技术,2014,33(7):50-53.(HE Xian-long,YANG Xue-shan,ZHAO Li-zhen.ANew Method for Dynamic Deflection Measurement of High-Speed Railway Bridge[J].Measurement&Control Technology,2014,33(7):50-53.in Chinese)
[6]余加勇,邵旭东,晏班夫,等.基于全球导航卫星系统的桥梁健康监测方法研究进展[J].中国公路学报,2016,29(4):30-41.(YU Jia-yong,SHAO Xu-dong,YAN Ban-fu,et al.Research and Development on Global Navigation Satellite System Technology for Bridge Health Monitoring[J].China Journal of Highway and Transport,2016,29(4):30-41.in Chinese)
[7]王翔,钟继卫,王波.桥梁动态挠度图像识别测试技术研究[J].世界桥梁,2015,43(3):59-62.(WANG Xiang,ZHONG Ji-wei,WANG Bo.Study of Bridge Dynamic Deflection Identification and Testing Technique Based on Image Processing[J].World Bridges,2015,43(3):59-62.in Chinese)
[8]程景扬,刘夏平,孙卓,等.连通管液压动态特性试验研究[J].广州大学学报(自然科学版),2013,12(2):44-48.(CHENG Jing-yang,LIU Xia-ping,SUN Zhuo,et al.The Accuracy Analysis of Pressure Connected Pipe Bridge Deflection Monitoring System[J].Journal of Guangzhou University(Natural Science Edition),2013,12(2):44-48.in Chinese)
[9]魏斌,王强.封闭式连通管挠度测量系统动态特性研究[J].交通标准化,2014,42(11):139-143.(WEI Bin,WANG Qiang.Dynamic Characteristic of Closed-End Connecting Pipe Deflection Monitoring System[J].Transportation Standardization,2014,42(11):139-143.in Chinese)
[10]蔡长林.振动环境对基于压力变送器的桥梁主梁变形监测影响研究(硕士学位论文)[D].哈尔滨:哈尔滨工业大学,2014.(CAI Chang-lin.Vibration Environment Impact on Bridge Girder Deflection Monitoring Base on the Pressure Transmitters(Master Dissertation)[D].Harbin:Harbin Institute of Technology,2014.in Chinese)
[11]钱学森,宋健.工程控制论(修订版)[M].北京:科学出版社,1980.(QIAN Xue-sen,SONG Jian.Engineering Cybernetics(Revised Edition)[M].Beijing:Science Press,1980.in Chinese)