| 基于EMD的桥梁GPS动态监测数据处理 |
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| 引用本文： | 王海,岳东杰.基于EMD的桥梁GPS动态监测数据处理[J].测绘工程,2015(11):68-72. |
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| 作者姓名： | 王海 岳东杰 |
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| 作者单位： | 河海大学 测绘科学与工程系,江苏 南京,210098 |
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| 摘 要： | 采用GPS监测运营期大跨度桥梁时,受到交通载荷和观测噪声的影响,GPS监测序列中的振动信号(mm级)完全被湮没,如何从监测序列中提取桥梁变形信息及其振动特性是桥梁健康检测的重要内容。文中利用EMD方法对GPS监测序列进行处理,得到一定数量的本征模态函数(IMF),选取特定的IMF做信号重构和功率谱分析,得到桥梁变形信息和振动特性,相较于传统FFT方法,能准确识别结构振动频率,同时提取变形特征。
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| 关 键 词： | EMD 动态监测 数据处理 频谱分析 特征提取 |
Dynamic GPS monitoring data processing based on EMD |
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| Abstract: | When GPS is used to monitor a large span bridge in the operation period ,because of being affected by the traffic load and the observation noise ,the vibration signal (mm level ) of GPS monitoring is completely obliterated .Thus how to extract the deformation information and the vibration characteristics of bridge from the GPS monitoring series is an important content of the bridge health monitoring .This paper uses the EMD method to process GPS monitoring series ,and gets a certain number of intrinsic mode function (IMF) .With selecting the specific IMF signal reconstruction and power spectrum analysis ,the bridge deformation information and vibration characteristics are obtained .Compared with the traditional FFT method ,it can accurately identify the vibration frequency of the structure of bridge ,and at the same time extract the deformation characteristics . |
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| Keywords: | EMD(Empirical Mode Decomposition) dynamic monitoring data processing spectrum analysis feature extraction |
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