本文对燃气—蒸汽联合循环机组轴系布置方案进行了详细研究，将其分为普通单轴布置轴系、带有SSS离合器（同步自动离合器）的单轴布置轴系、多轴布置中的燃气轮机轴系和汽轮机轴系4种类型。并且分析了4种类型与常规机组汽轮机轴系的区别，并通过对某联合循环电厂轴系的典型振动故障分析，讲述了此方面研究的重要性。本文从现场振动故障诊断和理论研究两个方面总结了近些年联合循环机组轴系振动的研究进展，提出带有SSS离合器的单轴布置轴系和多轴布置中带有SSS离合器的汽轮机轴系是今后的研究方向。

Compared with a traditional single absorption type refrigeration cycle, a hybrid working medium power and cooling cogeneration cycle will be favorable to enhancing the utilization efficiency of the intermediate temperature waste heat from an industry, however, the study of the mechanism governing the enhancement of the performance and efficiency is still not going deep into enough. Models for a simplified ammoniawater power and cooling cogeneration cycle system and an ammoniawater absorption type refrigeration cycle system were established and a fair bench mark for comparison was proposed. Through an analysis and comparson of the flow path, structure and thermodynamic characteristics, the difference between the hybrid working medium power and cooling cogeneration cycle and absorption type refrigeration cycle in the energy conversion and utilization was revealed and the mechanism governing the enhancement in the performance of the power and cooling cogeneration cycle was also analyzed. It has been noted that the expansion extent in the turbine is a key factor influencing the proportion of the thermal energy distributed in the power subcycle and the refrigeration sub-cycle and the thermal energy stepped utilization extent and the influence of the thermal energy on the performance of the system was also studied.

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