Font Size: a A A

Reconstruction And Prediction Of Wind Pressure Field For High-Rise Building

Posted on:2010-11-24Degree:MasterType:Thesis
Country:ChinaCandidate:D H WangFull Text:PDF
GTID:2132360275473300Subject:Structural engineering
Abstract/Summary:PDF Full Text Request
The Proper Orthogonal Decomposition (POD) is an optimal decomposition of random fields in terms of an energy representation. It is a tool for data compression and characteristic analysis of extractable. the principle of POD is deduced separately by the Mercer theorem and the concept of Rayleigh quotient and its extreme property in this article. Based on the Proper Orthogonal Decomposition, the surface of high-rise building wind pressure field is reconstructed with only a number of eigen modes , Analysis and summarization is also made to law of the reconstruction.Combined with simultaneous measurement wind pressure data of wind tunnel tests, the POD technique has been used to predict the wind pressure time series on the high-rise building where the pressure taps are not distributed. Surface interpolation, inverse distance interpolation, B-spline interpolation, cubic spline interpolation and bilinear interpolation five methods are employed to obtain the values of the proper modes on high-rise building where wind pressure time series are to be predicted. using the principal coordinates from the covariance analysis of the original pressure field and the new proper mode values, the wind pressure time series on the high-rise building without the pressure taps are acquired. In the time domain and frequency domain comparison of prediction by five interpolation methods with the measured wind pressure, we can see that the result of the cubic spline interpolation is the highest prediction accuracy and stability of the best, followed by surface interpolation prediction, also that the POD in the prediction of the surface wind field .on high-rise building is effective.Finally, Application of normalized POD technology , the original field pressure is further refined, The fluctuating wind pressure time series is decomposed into variance and normalized the time series, In the prediction of wind pressure field, the each interpolation method has different impact in two parts, with the help of normalized POD technology, the best interpolation method is choose to predict each part, that overcomes the disadvantage of inaccurate in partial pressure prediction and improves prediction accuracy.
Keywords/Search Tags:wind load, the proper orthogonal decomposition, wind field reconstruction, wind field prediction, wind tunnel test, high-rise building, interpolation
PDF Full Text Request
Related items