With the reverse design engineering theory, the reverse designs of the structure, CAD hydraulic properties, and the processing and material of the impeller are carried out.

根据反求工程理论，进行该叶轮的结构反求设计、CAD辅助水力性能反求设计和工艺及材料的反求设计。

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Compare with metals material, engineering plastics are a sort of new type project structure material, and lack the complete theories method and data in design and choice of materials.

工程塑料是一种新兴工程结构材料，与金属材料相比，在选材、设计和使用方面缺乏系统完整的理论方法和资料。

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The performance of the cushioning device is improved by using the intelligent material of the airbag combined with the advanced design concept of structure.

智能气囊采用了智能材料与结构新概念设计，可提高缓冲器的性能。

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