Theory of POD and its application in wind engineering of structures

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.