采用复合材料补片对损伤的金属飞机结构进行胶接修理，可以经济而有效地恢复结构的承载能力和延长结构的使用寿命。

It is most economical and effective to renew the load carrying capability and extend the service life by employing composite patches for repair of damaged metallic aircraft structures.

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文中针对现行船舶的维修体制和船用柴油机的使用管理及修理特点，从经济性出发，分析船用柴油机的寿命。

Aimed at present Marine maintaining system, managing for usage and repair characters of Marine diesels, this paper analyses their service life accordingly.

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一是提出了科学确定修理周期要求，在参考线路累计通过总重的基础上，应用工程类比分析法和经济寿命分析法进行综合分析确定；

On the base of the reference of track total passing weight, the analysing methods of engineering analogy and economy life-span are put forword.

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