POD原理解析及在结构风工程中的几点应用  

Theory of POD and its application in wind engineering of structures

作　　者：李方慧[1,2] 倪振华[3] 沈世钊[4] 顾明[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]黑龙江大学建筑工程学院,哈尔滨150086 [3]汕头大学土木工程系,汕头515063 [4]哈尔滨工业大学土木工程学院,哈尔滨15009

出　　处：《振动与冲击》2009年第4期29-32,共4页Journal of Vibration and Shock

基　　金：土木工程防灾国家重点实验室博士后基金(2006-C-02);黑龙江省教育厅科学技术研究面上项目(11521219);中国博士后科学基金资助(20070410736);国家创新研究群体科学基金(50621062)联合资助

摘　　要：本征正交分解(POD)是压缩数据和提取随机场本质特征的有效技术。介绍了POD的基本原理及其在结构风工程研究方面的主要优点,这些优点包括仅使用少量的本征模态就可很好的重建风压场;预测风压场时可提高测压点的分辨率,根据已有的风压数据获得没有布置测压点处的风压时间序列。以双坡屋盖为例,利用风洞试验同步测量的风压数据对以上几方面基本内容进行讨论,包括风压场的重建和预测分析。通过在时域和频域与实验结果对比表明POD技术的有效性和实用性。Proper orthogonal decomposition (POD) is an effective technique for data reduction and feature extraction of a random field. The basic theory of POD and main advantages of its applications in wind engineering of structures were presented. These advantages included that the original pressure field can be accurately reconstructed with a limited number of modes; the prediction of the wind pressure field increases the pressure tap resolution; POD technique can be used to predict pressure time series in the regions without pressure taps by using the existing pressure time series. Taking a pitched roof as an example, the contents mentioned above including reconstruction and prediction of wind pressure field were investigated using the wind pressure data measured simultaneously in a wind tunnel test. The effectiveness and practicability of POD were illustrated by comparing new data with test data in time domain and frequency domain.

关 键 词：本征正交分解 双坡屋盖 风压场重建 风压场预测 

分 类 号：TU312[建筑科学—结构工程]