基于频率法的索力测量系统
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摘要
为了在工程现场快速方便地检测斜拉桥的拉索索力,依据随机振动法索力检测原理,开发了一种新型的索力测量系统。通过对随机振动法索力检测方法的概述,介绍了该系统的性能、硬件结构和软件模块,并重点阐述了通过数字滤波抑制快速傅里叶分析(FFT)的混频现象、自动扫描确定主振频率和提高索力计算精度的方法和措施。索力测量系统以AT89C55WD单片机(SCM)为平台,集成了电荷放大器、信号分析仪和计算器的相关功能。在工程现场,只需输入少量参数,拉索振动信号采集、信号的快速傅里叶分析和对应的索力计算即可在线自动完成。
In order to measure the cable tensions of a cable-stayed bridge quickly and conveniently at a construction site,a new measuring system of cable tension was developed according to the random vibration frequency method. With summarizing the principle of the random vibration frequency method,the function,hardware construction and software module of this system were introduced.The ways and means to solve some key technical problems were discussed emphatically using digital filter to restrain frequency confusion of FFT,scanning and confirming main frequency of a vibration signal,and improving calculation precision of a cable tension.The system was based on an AT89C55WD SCM.The functions of a charge amplifying,a signal analyser and a calculator were integrated in an instrument.After a few parameters were inputted,the collecting vibration signal,the FFT of the signal and the estimating cable force could be carried out automatically on line at a construction site.
In order to measure the cable tensions of a cable-stayed bridge quickly and conveniently at a construction site,a new measuring system of cable tension was developed according to the random vibration frequency method. With summarizing the principle of the random vibration frequency method,the function,hardware construction and software module of this system were introduced.The ways and means to solve some key technical problems were discussed emphatically using digital filter to restrain frequency confusion of FFT,scanning and confirming main frequency of a vibration signal,and improving calculation precision of a cable tension.The system was based on an AT89C55WD SCM.The functions of a charge amplifying,a signal analyser and a calculator were integrated in an instrument.After a few parameters were inputted,the collecting vibration signal,the FFT of the signal and the estimating cable force could be carried out automatically on line at a construction site.
引文
[1]许俊.斜拉索索力简化计算中的精度分析[J].同济大学学报:自然科学版,2001,29(5):611-615.XU Jun.Precision Analysis of Calculating TensionForce of Cable[J].Journal of Tongji University:Nat-ural Science,2001,29(5):611-615.
[2]段波,曾德荣,卢江.关于斜拉桥索力测定的分析[J].重庆交通学院学报,2005,24(4):6-12.DUAN Bo,ZENG De-rong,LU Jiang.Analysis withDetermining Cable Tension of Cable-Stayed Bridges[J].Journal of Chongqing Jiaotong University,2005,24(4):6-12.
[3]乔陶鹏,严普强,邓焱,等.斜拉索索力估算中振动信号处理方法的改进[J].清华大学学报:自然科学版,2003,43(5):644-647.QIAO Tao-peng,YAN Pu-qiang,DENG Yan,et al.Data Process Sing of Vibration Signals for Cable Ten-sion Estimation[J].Journal of Tsinghua University:Natural Science Edition,2003,43(5):644-647.
[4]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):148-151.ZHANG Hong-yue,TIAN Shi-zhu.A Method to En-hance the Estimation Accuracy of Stay Cable Tension[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(4):148-151.
[5]宋一凡,贺拴海.斜拉索动力计算长度研究[J].中国公路学报,2001,14(3):70-72.SONG Yi-fan,HE Shuan-hai.Research on DynamicCalculating Length of Cable in Cable Stayed Bridges[J].China Journal of Highway and Transport,2001,14(3):70-72.
[6]李惠,刘敏,欧进萍,等.斜拉索磁流变智能阻尼控制系统分析与设计[J].中国公路学报,2005,18(4):37-41.LI Hui,LIU Min,OU Jin-ping,et al.Design and A-nalysis of Magnetorheological Dampers with Intelli-gent Control Systems for Stay Cables[J].China Jour-nal of Highway and Transport,2005,18(4):37-41.
[7]陈常松,陈政清,颜东煌.柔索索力主频阶次误差及支承条件误差[J].交通运输工程学报,2004,4(4):17-20.CHEN Chang-song,CHEN Zheng-qing,YAN Dong-huang.Frequency Number Error and Support Condi-tion of Flexible Cable Tension[J].Journal of Trafficand Transportation Engineering,2004,4(4):17-20.
[8]梅葵花,吕志涛.CFRP斜拉索的静力特性分析[J].中国公路学报,2004,17(2):43-45.MEI Kui-hua,LU Zhi-tao.Static Characteristic Anal-ysis of CFRP Cables[J].China Journal of Highwayand Transport,2004,17(2):43-45.
[9]谭冬莲,肖汝诚.基于Levenberg-Marquardt算法的桥梁结构静力参数识别[J].交通运输工程学报,2005,5(3):56-59.TAN Dong-lian,XIAO Ru-cheng.Static Parameter I-dentification of Bridge Structure Based on Levenberg-Marquardt Algorithm[J].Journal of Traffic andTransportation Engineering,2005,5(3):56-59.
[10]陈水生.斜拉桥拉索的MR半主动控制研究[J].中国公路学报,2004,17(2):50-54.CHEN Shui-sheng.Research on MR Semi-active Con-trol of Cables in Cable-Stayed Bridges[J].China Jour-nal of Highway and Transport,2004,17(2):50-54.
[11]侯俊明,彭晓彬,叶力才.斜拉索索力的温度敏感性[J].长安大学学报:自然科学版,2002,22(4):34-36.HOU Jun-ming,PENG Xiao-bin,YE Li-cai.Tempera-ture Effect on Cable s Forces Controlling of Cable-Stayed Bridge[J].Journal of Chang an University:Natural Science Edition,2002,22(4):34-36.
[12]狄谨,武隽.自锚式悬索桥主缆线形计算方法[J].交通运输工程学报,2004,4(3):38-43.DI Jin,WU Jun.Calculation Methods for Cable Curveof Self-anchored Suspension Bridge[J].Journal ofTraffic and Transportation Engineering,2004,4(3):38-43.
[13]颜海,范立础.大跨度斜拉桥索梁锚固中的非线性接触问题[J].中国公路学报,2004,17(2):46-49.YAN Hai,FAN Li-chu.Research on Nonlinear Con-tact Problem of Cable-Beam Anchorage for Long-SpanCable-Stayed Bridge[J].China Journal of Highwayand Transport,2004,17(2):46-49.
[14]尚鑫,徐岳.基于灰色理论的斜拉桥安全性评价[J].长安大学学报:自然科学版,2004,24(1):52-55.SHANG Xin,XU Yue.Safety-Based Cables Condi-tion Evaluation of Cable Stayed Bridge with GreyTheory[J].Journal of Chang an University:NaturalScience Edition,2004,24(1):52-55.
[15]殷学纲,姚建军.中承式拱桥吊索损伤对吊索系静张力的影响[J].中国公路学报,2004,17(1):45-48.YIN Xue-gang,YAO Jian-jun.Effect on Sling SystemTension from Sling Damage in Mid-supported ArchBridge[J].China Journal of Highway and Transport,2004,17(1):45-48.
[16]陈政清.斜拉索风雨振现场观测与振动控制[J].建筑科学与工程学报,2005,22(4):5-10.CHEN Zheng-qing.On-Site Observation of Wind-RainInduced Vibration of Stay Cables and Its Control[J].Journal of Architecture and Civil Engineering,2005,22(4):5-10.
[2]段波,曾德荣,卢江.关于斜拉桥索力测定的分析[J].重庆交通学院学报,2005,24(4):6-12.DUAN Bo,ZENG De-rong,LU Jiang.Analysis withDetermining Cable Tension of Cable-Stayed Bridges[J].Journal of Chongqing Jiaotong University,2005,24(4):6-12.
[3]乔陶鹏,严普强,邓焱,等.斜拉索索力估算中振动信号处理方法的改进[J].清华大学学报:自然科学版,2003,43(5):644-647.QIAO Tao-peng,YAN Pu-qiang,DENG Yan,et al.Data Process Sing of Vibration Signals for Cable Ten-sion Estimation[J].Journal of Tsinghua University:Natural Science Edition,2003,43(5):644-647.
[4]张宏跃,田石柱.提高斜拉索索力估算精度的方法[J].地震工程与工程振动,2004,24(4):148-151.ZHANG Hong-yue,TIAN Shi-zhu.A Method to En-hance the Estimation Accuracy of Stay Cable Tension[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(4):148-151.
[5]宋一凡,贺拴海.斜拉索动力计算长度研究[J].中国公路学报,2001,14(3):70-72.SONG Yi-fan,HE Shuan-hai.Research on DynamicCalculating Length of Cable in Cable Stayed Bridges[J].China Journal of Highway and Transport,2001,14(3):70-72.
[6]李惠,刘敏,欧进萍,等.斜拉索磁流变智能阻尼控制系统分析与设计[J].中国公路学报,2005,18(4):37-41.LI Hui,LIU Min,OU Jin-ping,et al.Design and A-nalysis of Magnetorheological Dampers with Intelli-gent Control Systems for Stay Cables[J].China Jour-nal of Highway and Transport,2005,18(4):37-41.
[7]陈常松,陈政清,颜东煌.柔索索力主频阶次误差及支承条件误差[J].交通运输工程学报,2004,4(4):17-20.CHEN Chang-song,CHEN Zheng-qing,YAN Dong-huang.Frequency Number Error and Support Condi-tion of Flexible Cable Tension[J].Journal of Trafficand Transportation Engineering,2004,4(4):17-20.
[8]梅葵花,吕志涛.CFRP斜拉索的静力特性分析[J].中国公路学报,2004,17(2):43-45.MEI Kui-hua,LU Zhi-tao.Static Characteristic Anal-ysis of CFRP Cables[J].China Journal of Highwayand Transport,2004,17(2):43-45.
[9]谭冬莲,肖汝诚.基于Levenberg-Marquardt算法的桥梁结构静力参数识别[J].交通运输工程学报,2005,5(3):56-59.TAN Dong-lian,XIAO Ru-cheng.Static Parameter I-dentification of Bridge Structure Based on Levenberg-Marquardt Algorithm[J].Journal of Traffic andTransportation Engineering,2005,5(3):56-59.
[10]陈水生.斜拉桥拉索的MR半主动控制研究[J].中国公路学报,2004,17(2):50-54.CHEN Shui-sheng.Research on MR Semi-active Con-trol of Cables in Cable-Stayed Bridges[J].China Jour-nal of Highway and Transport,2004,17(2):50-54.
[11]侯俊明,彭晓彬,叶力才.斜拉索索力的温度敏感性[J].长安大学学报:自然科学版,2002,22(4):34-36.HOU Jun-ming,PENG Xiao-bin,YE Li-cai.Tempera-ture Effect on Cable s Forces Controlling of Cable-Stayed Bridge[J].Journal of Chang an University:Natural Science Edition,2002,22(4):34-36.
[12]狄谨,武隽.自锚式悬索桥主缆线形计算方法[J].交通运输工程学报,2004,4(3):38-43.DI Jin,WU Jun.Calculation Methods for Cable Curveof Self-anchored Suspension Bridge[J].Journal ofTraffic and Transportation Engineering,2004,4(3):38-43.
[13]颜海,范立础.大跨度斜拉桥索梁锚固中的非线性接触问题[J].中国公路学报,2004,17(2):46-49.YAN Hai,FAN Li-chu.Research on Nonlinear Con-tact Problem of Cable-Beam Anchorage for Long-SpanCable-Stayed Bridge[J].China Journal of Highwayand Transport,2004,17(2):46-49.
[14]尚鑫,徐岳.基于灰色理论的斜拉桥安全性评价[J].长安大学学报:自然科学版,2004,24(1):52-55.SHANG Xin,XU Yue.Safety-Based Cables Condi-tion Evaluation of Cable Stayed Bridge with GreyTheory[J].Journal of Chang an University:NaturalScience Edition,2004,24(1):52-55.
[15]殷学纲,姚建军.中承式拱桥吊索损伤对吊索系静张力的影响[J].中国公路学报,2004,17(1):45-48.YIN Xue-gang,YAO Jian-jun.Effect on Sling SystemTension from Sling Damage in Mid-supported ArchBridge[J].China Journal of Highway and Transport,2004,17(1):45-48.
[16]陈政清.斜拉索风雨振现场观测与振动控制[J].建筑科学与工程学报,2005,22(4):5-10.CHEN Zheng-qing.On-Site Observation of Wind-RainInduced Vibration of Stay Cables and Its Control[J].Journal of Architecture and Civil Engineering,2005,22(4):5-10.
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