In the 4th chapter, we build a simple high-level workflow modeling language-M4L, which is used to describe the plat independent model based on multi meta-model.
第四章，构造一个简单的高层次描述语言m4l，使用它描述基于多元模型的平台无关的工作流模型。
After getting the relatively accurate static stiffness of groundsill, the soil-frame structure dynamics interaction is studied by the simplified method in the 4th chapter.
在得到比较精确的地基静刚度后，本文通过第四章中的简化算法求解了地基与结构的动力相互作用。
In the 4th chapter, the BP neural networks is used to study the sample data, thus realize the mapping from absorbing energy of Charpy Experiment to fracture toughness on the basis of probability.
第四章主要是应用神经网络算法学习由数值计算得到的样本，实现了由夏比吸收能量值到断裂韧性值的在概率基础上的映射。
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