基于SIMP密度函数惩罚模型和优化准则法，建立了一种设计变量的显式迭代格式。

Further, an implicit iterative algorithm for the design variables is also established based on SIMP interpolation scheme and optimality criteria method.

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本文将数学规划法与优化准则法有机地结合起来，导出了一种新的优化方法——变尺度梯度投影法。

A new nonlinear optimization method called variable metric gradient projection method is presented. It is a combination of mathematical programming with optimality criterion.

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该方法利用最大似然准则建立目标函数，同时利用非线性共轭梯度法来优化求解目标函数。

The objective function was established based on the maximum likelihood rule, which was solved by nonlinear conjugate gradient method.

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