船用燃气轮机盘-叶耦合系统固有振动特性研究

随着船用燃气轮机的转子轮盘不断向轻、薄的方向优化，只考虑根部固支下叶片的振动已不再能满足安全需求，将轮盘—叶片作为一个耦合系统来研究其振动特性是十分必要的。而且转子在高温高转速下工作，为了准确求解耦合系统的振动特性，不可忽视温度、转速对振动的影响。文章建立了船用燃气轮机转子盘—叶模型，应用有限元程序和循环对称结构算法，从实际工况角度出发，计算不同旋转、不同温度及其变化率下耦合系统的固有振动特性。归纳出温度、转速与盘—叶耦合系统固有振动特性间的关系，为预防船用燃气轮机转子出现耦合共振危险及可靠性计算提供了数值依据。

Research of vibration characteristics of blades-disc coupled system for marine gas-turbine

As turbine disc of marine gas-turbine is continuously developing towards the direction of light and thin, considering only the blade vibration under fixed support on root area can no longer meet the de-sign requirements, and it is very necessary to take disc-blade as a coupled system to study its natural vi-bration. Turbine rotor works under high temperature and high rotational speed. In order to accurately solve the natural vibration characteristics of coupled systems, the influence of temperature and rotational speed can not be ignored. By establishing turbine disc-blade model, using finite element program and cyclic sym-metric structure algorithm, the natural vibration characteristics of coupled system under different rotation, temperature and change rate which are from the aspect of actual working conditions were calculated, and the relationship among the natural vibration characteristics of disc-blade coupled system, the temperature and the rotation speed was concluded. The results could provide numerical basis for the turbine’s reliabil-ity and prevent the coupling resonance risk of the turbine rotor.