高速公路斜拉桥索力检测数据快速采集与识别方法
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摘要
索力监测是高速公路斜拉桥健康监测的重要内容之一。将拉索振动加速度信号采集与信号处理并行,可缩短索力检测数据的输出间隔,提高索力监测的实时性。基频法是测量拉索索力的简便快捷的方法,其中拉索振动基频的准确识别是关键。我们提出了基于多次自相关的振动基频识别方法,实验验证,该方法在有干扰信号存在的情况下能准确识别拉索振动的基频。
Cable tension is an important item for the cable-stayed bridge health monitoring.Based on data cache,the tension measurement period is shorted mostly by having data acquirement and cable computation paralleled.Natural frequency method is simple and efficient for cable tension computation.A new method for cable vibration natural frequency is introduced and implemented.By the property that the spectrum of cable vibration wave consists of constant approximately distance peaks,the multiple auto-correlation function is used to find the average distance.Experiences show that this method is more robust than traditional one.
Cable tension is an important item for the cable-stayed bridge health monitoring.Based on data cache,the tension measurement period is shorted mostly by having data acquirement and cable computation paralleled.Natural frequency method is simple and efficient for cable tension computation.A new method for cable vibration natural frequency is introduced and implemented.By the property that the spectrum of cable vibration wave consists of constant approximately distance peaks,the multiple auto-correlation function is used to find the average distance.Experiences show that this method is more robust than traditional one.
引文
[1]刘效尧,蔡键,刘晖.桥梁损伤诊断[M].北京:人民交通出版社,2002.
[2]张运波,林玉森,高伟,等.部分斜拉桥的索力测试与分析[J].铁道标准设计,2005(5):63-65.
[3]高建勋.斜拉桥索力测试方法及误差研究[J].公路与汽运,2004(4):80-81.
[4]林志宏,徐郁峰.频率法测量斜拉桥索力的关键技术[J].中外公路,2003(5):1-4.
[5]刘碧慧.马桑溪长江大桥拉索索力远程自动实时监测技术研究[D].重庆:重庆大学,2005.
[6]程辉,田石柱.斜拉索基频识别的改进方法[J].低温建筑技术,2006(4):54-56.
[7]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003(3):100-106.
[2]张运波,林玉森,高伟,等.部分斜拉桥的索力测试与分析[J].铁道标准设计,2005(5):63-65.
[3]高建勋.斜拉桥索力测试方法及误差研究[J].公路与汽运,2004(4):80-81.
[4]林志宏,徐郁峰.频率法测量斜拉桥索力的关键技术[J].中外公路,2003(5):1-4.
[5]刘碧慧.马桑溪长江大桥拉索索力远程自动实时监测技术研究[D].重庆:重庆大学,2005.
[6]程辉,田石柱.斜拉索基频识别的改进方法[J].低温建筑技术,2006(4):54-56.
[7]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003(3):100-106.
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