以下为句子列表：
英文: Abstract: The investigation about the present situation of safeness,the analysis and summary about the present situation of safeness study at home and abroad, and the prospect about the development trend of safeness technique for tower crane are carried o
中文: 文摘:对塔式起重机安全性现状进行了调查，并对国内外塔式起重机安全性研究的现状进行了分析与总结，最后，对塔式起重机的安全性技术的发展趋势进行了展望。
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英文: This paper establishes vibration models of the hoisting and balancing booms of the QTZ400 tower crane, discusses factors that influence the booms' natural frequencies, and describes the mecessity of vibration analysis during tower crane design.
中文: 摘要以QTZ400型塔式起重机为例，建立其吊臂和平衡臂系统的振动模型，分析影响固有频率的因素，并详细地阐述了进行振动分析在塔式起重机设计中的必要性。
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英文: Force study for slewing ring of tower crane QTZ
中文: QTZ 塔机上回转支座的受力特征研究
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