BERMAN updating arithmetic makes use of experimental model matrix and eigenvalue to modify the finite element academic model, based on the model orthographical condition of non-damping system.
BERMAN修正方法基于无阻尼系统的模态正交条件，利用实验模态矩阵和特征值对有限元理论模型进行修正。
Orthographical experimentation was used to search the optimum formula and the best processing condition.
采用正交实验的方法寻求最佳配方和工艺条件。
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