高速公路斜拉桥索力检测数据快速采集与识别方法

The method of data fast acquisition and recognition for cable detect system on highway cable-stayed bridge

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 computa- tion. A new method for cable vibration natural frequency is introduced and implemented. By the prop- erty 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 meth- od is more robust than traditional one.