现场监测脉动风速的APES法幅值谱相位谱估计  

Estimation of Fluctuating Wind Amplitude and Phase Spectrum Using APES Algorithm Based on Field Monitored Data

作　　者：王向杰 淡丹辉[1] 闫兴非 程纬[1] WANG Xiangjie;DAN Danhui;YAN Xingfei;CHENG Wei(College of Civil Enginerring,Tongii University Shanghai,200092,China;Shanghai Urban Construction Design Research Institute Shanghai,200215,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海市城市建设设计研究总院,上海200125

出　　处：《振动．测试与诊断》2019年第2期431-437,452,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家高技术研究发展计划("八六三"计划)资助项目(2014AA110402);"十二五"国家科技支撑计划课题资助项目(2012BAJ11B01);中央高校基本科研业务费专项资金;国家气象局气象行业科研专项经费的联合资助项目(201306102)

摘　　要：对于超高、大跨架构而言,风致振动是结构安全的重要威胁,对风荷载的建模分析对结构安全具有重要的意义。针对常用的Fourier算法在实测数据谱分析中具有识别精度与频率分辨率不高的缺点,采用一种非参数高精度的幅值相位估计方法(amplitude and phase estimation,简称APES),实现某桥现场实测风速数据的脉动风幅值谱和相位谱高精度估计。通过对估计结果进行统计分析,得到幅值谱与相位谱的概率统计信息并给出在各频率处建议的幅值与相位分布类型,从而提高本地区风谱模型的建模精度,这对结构抗风设计和安全评估均具有重要意义。For super-tall and long-span structures,wind-induced vibration possesses a threat to the structural safety.It is important to model and analysis the wind load.The fluctuating wind power spectra in given specifications could only reflect the second-order probabilistic characteristic,which indicates that it is not capable of fully expressing the stochastic wind field.Besides,the popular Fourier transfer algorithm cannot achieve a high estimation accuracy and high resolution.In view of this problem,a high-resolution nonparametric spectral estimation algorithm-amplitude and phase estimation(APES)is used to estimate the fluctuating wind amplitude and phase spectrum,using the field measured wind velocity data of a certain cable stayed bridge.Through statistical analysis,the mean value of the amplitude spectrum and phase spectrum,as well as the distribution type at different frequency points,are obtained,thus to improve the modeling accuracy of the fluctuating wind spectrum,which is important in anti-wind design and safety assessment.

关 键 词：脉动风 幅值谱 相位谱 结构抗风 

分 类 号：TU317.2[建筑科学—结构工程] TH824[机械工程—仪器科学与技术]