本文针对机械结构动力修改的特征导数法(EDM)所存在的问题，提出逆特征导数法(IEDM)。

In this paper, an inverse eigen derivative method (IEDM) for dynamic modification of mechanical structures is formulated for improving the eigen derivative method (EDM).

youdao

采用矩阵迭代法可以直接迭代计算特征向量导数，避免了对奇异灵敏度方程的求解。

Using matrix iteration methods, the eigenvector derivatives can be iterated directly, solving the singular sensitivity equation can be avoided.

youdao

而且为了保持图像特征，利用图像的方向导数局部地调整非线性扩散系数。

To preserve image features, the nonlinear diffusion coefficients are locally adjusted according to the directional derivatives of the image.

youdao