Ambient vibration test is the main method of detecting a large bridge structure, Modal parameters is important to determine the health status of the bridge.

环境振动试验是检测大型桥梁结构的主要方法，检测得到的模态参数是判定桥梁健康状况的重要依据。

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But, presently the research on damage detection and diagnosis of structure focus on bridge and tier building, and the research on large space structures are few.

但是，目前结构的损伤检测与诊断研究多集中在桥梁、高层等结构上，针对大跨度空间结构损伤检测与诊断的研究很少。

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The rationality and reliability of main hoist reducer adopted with double spiders structure for large bridge crane are introduced.

介绍了设计大吨位双钩桥式起重机主起升减速器采用双行星轮结构的合理性和可靠性。

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