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基于有限的风洞试验测试结果,提出了结合本征正交分解(POD)和薄板样条插值(TPS)预测未知点风压的方法,并将此方法应用于一座实际大跨度屋盖结构,在时域和频域上预测值与试验结果的对比证明了该方法的有效性和实用性。预测值与实测值的自功率谱在低频及高频部分都吻合得较好;相比自功率谱,相干函数预测的精度要低一些。同时指出POD-TPS法得到的风压值与直接薄板样条插值结果几乎是完全相同的,其预测结果完全取决于插值方法;POD法的好处在于,它将对时程的插值转换为对少量本征模态的插值,大大降低了计算量。
Based on the finite wind tunnel test results, a method of predicting the wind pressure at unknown points based on POD and TPS is proposed. The method is applied to a real long-span roof structure, The comparison between the predicted values and the experimental results in time domain and frequency domain proves the validity and practicability of the proposed method. The predicted and measured self-power spectra agree well with the low-frequency and high-frequency components. Compared with the self-power spectrum, the accuracy of the coherence function is lower. At the same time, it is pointed out that the wind pressure value obtained by POD-TPS method is almost the same as the direct thin-plate spline interpolation result. The prediction result depends entirely on the interpolation method. The advantage of POD method is that it converts the interpolation of time- The eigenmode interpolation greatly reduces the computational complexity.