This article USES PROTO NODE build model of Part, Constructs the assembly model tree structure according to the CAD model assembly relations.

本文利用PROTO原型节点建立零部件模型，按照CAD模型的装配关系构建装配体模型树结构。

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Concentrating on the conceptual and structural stage, a hierarchical data structure of the logical assembly model was presented, and the key components of it were analyzed.

侧重于概念和结构设计阶段，提出了概念装配模型的层次化数据结构，并对其中的关键组成元素进行了分析。

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First establish finite element model of engine assembly, and provide evidence for the structure modification of engine through mode analysis.

首先建立发动机总成有限元模型，通过模态分析，为发动机的结构修改提供依据。

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