测绘工程
測繪工程
측회공정
ENGINEERING OF SURVEYING AND MAPPING
2015年
11期
68-72
,共5页
EMD%动态监测%数据处理%频谱分析%特征提取
EMD%動態鑑測%數據處理%頻譜分析%特徵提取
EMD%동태감측%수거처리%빈보분석%특정제취
EMD(Empirical Mode Decomposition)%dynamic monitoring%data processing%spectrum analysis%feature extraction
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。
採用GPS鑑測運營期大跨度橋樑時，受到交通載荷和觀測譟聲的影響，GPS鑑測序列中的振動信號（mm級）完全被湮沒，如何從鑑測序列中提取橋樑變形信息及其振動特性是橋樑健康檢測的重要內容。文中利用 EMD方法對GPS鑑測序列進行處理，得到一定數量的本徵模態函數（IMF），選取特定的IMF做信號重構和功率譜分析，得到橋樑變形信息和振動特性，相較于傳統FFT方法，能準確識彆結構振動頻率，同時提取變形特徵。
채용GPS감측운영기대과도교량시，수도교통재하화관측조성적영향，GPS감측서렬중적진동신호（mm급）완전피인몰，여하종감측서렬중제취교량변형신식급기진동특성시교량건강검측적중요내용。문중이용 EMD방법대GPS감측서렬진행처리，득도일정수량적본정모태함수（IMF），선취특정적IMF주신호중구화공솔보분석，득도교량변형신식화진동특성，상교우전통FFT방법，능준학식별결구진동빈솔，동시제취변형특정。
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 .
