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中文摘要：
对于高速电机机组而言，在设计阶段准确预测转子动态特性，尽量减小发生故障的可能性是至关重要的。该文用有限元分析及实验方法计算由柔性联轴器耦合的多跨转子轴系临界转速及振动模态，用有限元软件的弹簧单元模拟弹性联轴器的轴向、径向及扭转刚度，分析联轴器刚度、结构参数对轴系临界转速的影响。研究表明：轴系临界转速及振动模态不同于单转子，可以通过改变膜片的刚度、结构参数等来调整系统某些阶次的临界转速，使转子具有良好的动态特性。
英文摘要：
For a high-speed motor unit, it is very important to accurately predict dynamic characteristics of the rotor for high speed performance at the design stage so as to minimize the likelihood of failure. Finite element （FE） analysis and experimental measurements are used to calculate the critical speeds, and the modes of multi-span shafting coupled by flexible coupling, and the axial, radial and torsional stiffness of elastic coupling are simulated using the spring element of FE analysis tools. The influence of coupling stiffness and leading design parameters of coupling are analyzed. The results show that the critical speeds and mode shapes of shafting are different from a single rotor, and can be adjusted by changing the stiffness and structure of coupling in order that the shafting has sound dynamic properties.
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