This phenomenon is all existed under various kinds of optimization criterion of the progressive structural optimization design.
在渐进结构优化设计的各种优化判据下都存在这一现象。
In this paper, the basic structural characteristics of combination forecasting model is studied under the criterion of vectorial Angle cosine.
针对基于向量夹角余弦准则下组合预测模型，研究它的基本结构特征。
Extending it to iterative solution of structural optimization nonlinear criterion equations, complete automatization of iterative seeking solution for structural optimization can be implemented.
将其推广到结构优化非线性准则方程组的迭代求解，可实现结构优化迭代求解的完全自动化。
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