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。文中介绍了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。
Abstract: Proper orthogonal decomposition (POD) is an effective technique for data reduction and feature extraction of the random field. This paper introduces the basic theory of the POD and main advantages of its applications to wind engineering of structures, these include 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, the POD technique can be used to predict pressure time series in the regions without pressure taps by using the existing pressure time series. Taking the pitched roof as an example, mentioned contents above which include reconstruction and prediction of wind pressure field was investigated by using the wind pressure data which are measured simultaneously in a wind tunnel test. The effectiveness and practicability of POD was illustrated by comparing with original data in the time domain and frequency domain.