本征正交分解技术在屋盖风压场重建与预测中的应用

给出利用本征正交分解(POD)对屋盖风压场进行重建和预测的研究结果.对一个双坡屋盖用同步多点压力扫描系统进行了风洞试验,根据POD技术采用前若干阶本征模态重建屋盖风压场.采用两种方案预测未布置测压点位置的风压时间序列.第一种方案中利用插值技术获得没有测压点位置的本征模态值.第二种方案对参考屋盖和需预测的新屋盖分别进行试验,结合由参考屋盖试验萃取的本征模态和由新屋盖试验的风压数据计算的主坐标,预测出新屋盖未知区域的风压时间序列.文中对风压场重建和预测的效果作了分析,而且比较了根据测量的风压数据和预测的风压数据所计算的屋盖风致响应.

Reconstruction and Prediction of Wind Pressure Field on Roof

An investigation to reconstruction and prediction of wind pressure field on roof with proper orthogonal decomposition(POD)is presented.The wind tunnel tests of a pitched roof are conducted by synchronous multi-pressure scanning system.The pressure field on the roof is reconstructed by the first several proper modes,and the pressure time series on locations of the roof where the pressure taps are not attached are predicted by two schemes.The interpolation technique is adopted to obtain the proper modes on locations without taps in the first scheme,two measurements are involved for a reference roof and a newly predicted roof respectively in the second scheme.The proper modes extracted from the measurement of the reference roof and the principal coordinates evaluated via pressure data from the measurement of the new roof are combined to obtain the pressure time series on the unknown regions of the new roof.The effectiveness of pressure reconstruction and prediction are examined,and the wind-induced response of the roof is calculated the results from measured pressure data and predicted pressure data respectively are compared.