结果表明，多参考点互相关差分模型能够有效地进行环境激励下的模态识别，并且多项式特征值法比增广矩阵法所得结果更好。

It shows that the presented method can be used to identify modal parameters effectively under ambient excitation and that the polynomial eigenvalue method is superior to the augmented matrix method.

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实践证明，三至五次多项式就能产生足够小的残差和单调递增的导数。

In general, experience has shown that third-to fifth-degree polynomials produce sufficiently low residuals and monotonically increasing derivatives .

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然后，将差分公式展开，得出了直接用自变量的多项式形式表示的改进的EVERETT插值公式。

Then an improved EVERETT interpolation formula in the form of polynomial of the variable is obtained by developing the differential form.

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