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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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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显然，差分算子及其逆算子是阶乘幂多项式的方便工具。

Clearly, the difference operator or sum operator is the convenient tool for the polynomial of factorial powers.

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显然，差分算子及其逆算子是阶乘幂多项式的方便工具。

Clearly, the difference operator or sum operator is the convenient tool for the polynomial of factorial powers.

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