基于RTK-GPS技术的高索塔振动试验与分析

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (3) : 134-136,.

论文

基于RTK-GPS技术的高索塔振动试验与分析

许昌1,2 ; 岳东杰2

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Ambient Vibration Test of High Pylon Based On RTK-GPS Technology

XU Chang1,2; YUE dongjie

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文章历史 +

摘要

随着全球定位系统(GPS)技术的不断成熟，这一实时、高动态、高精度的观测手段已逐步应用于大型桥梁的健康监测中。以某一斜拉桥高索塔为背景，建立基于RTK-GPS技术的高索塔监测系统。介绍接收机和监测点位的布设以及监测坐标系的建立。针对监测过程中所受到各类误差影响源的干扰特别是GPS多路径、环境温度变化和风荷载等低频噪声，主要采用小波多尺度分析法，对这些低频噪声和振动信号进行有效分离。通过频谱分析获取该高索塔自立状态下的自振主频，与有限元分析的结果吻合。

Abstract

The technology of real time kinematic global positioning system (RTK-GPS) has been used in the health monitoring of large structures in recent years. A structure monitoring system based on the RTK-GPS technology is devised for the high pylon of a cable-stayed bridge. The GPS receiver and its deployment, and the monitoring coordinate system for such system are also described. The rough GPS observables are processed by using the wavelet multi-resolution analysis (MRA), to eliminate some error sources or biases (e.g. multipath, the thermal and wind effect) contained within the GPS observables. The low-frequency noise and vibration signals are effectively separated, and the natural frequency of the self-erected pylon is availably obtained by using the frequency spectrum analysis. The measuring result is consistent with the the predicted value by the finite element model (FEM) analysis.