针对某涡扇发动机悬臂高速转子在结构设计阶段，提出空心轴和实心轴两种方案，基于梁单元有限元法分别建立带空心轴和带实心轴的转子动力学分析模型，并开展了临界转速和振型计算。计算结果表明：转子宜选用空心轴结构；在此基础上，进行了带空心轴的转子不平衡响应对特征位置上的不平衡量的敏感程度分析，为高速动平衡试验的平衡面选择提供了依据；最后，完成了带空心轴模拟转子在全转速范围内的动力特性试验和工作转速下的高速动平衡试验。转子平稳越过两阶弯曲临界转速并安全运行至工作转速，验证了转子采用空心轴结构以及动力学设计的合理性；与试验结果比较，建立的有限元模型计算误差不大于4.08%，很好地反映了转子的动力特性；高速动平衡后转子在工作转速下的挠度大幅降低，不低于33.33%；研究成果为真实低压转子的结构、动力学设计和试验研究提供了参考和技术支持，具有重要的工程价值。

Two schemes, hollow shaft and solid shaft were proposed for the cantilever high-speed rotor of a turbofan engine during the structural design stage. Based on the beam element finite element method, rotor dynamic analysis models with hollow shaft and solid shaft were established, and critical speed and vibration mode calculations were carried out. The calculation results show that hollow shaft structure is suitable for the rotor. Then, an analysis was conducted on the sensitivity of the unbalance response of a rotor with a hollow shaft to the unbalance amount at the characteristic position, providing a basis for the selection of balance surfaces in high-speed dynamic balance test. Finally, the dynamic characteristics test of the simulated rotor with hollow shaft within the full speed range and the high-speed dynamic balance test research at the working speed were completed. The rotor smoothly crossed the two orders bending critical speed and safely operated to the working speed, verifying the rationality of the rotor's hollow shaft structure and dynamic design. Compared with the experimental results, the calculation error of the established finite element model is not more than 4.08%, which well reflects the dynamic characteristics of the rotor. After high-speed dynamic balancing, the deflection of the rotor at the working speed is significantly reduced, not less than 33.33%. The research results provide reference and technical support for the structural, dynamic design, and experimental research of real low-pressure rotors, and has important engineering value.