The dynamic force transmissibility (DFT) of aerospace flywheel rotor system (FRS) supported by angular contact ball bearings (ACBBs) is examined in this paper. The influence of combined loads and contact angle variation is considered in the Sjovall formula to accurately solve the load distribution and nonlinear stiffness of ACBB. Subsequently, the lateral vibration model of FRS is established by considering the nonlinear stiffness characteristics of ACBB. The DFT of the system is solved via harmonic balance method and arc length continuation, and the stability of the results is determined. Numerical integration and dynamic tests are utilized to verify the accuracy of harmonic balance results. Based on the proposed model, the effects of rotor unbalance excitation, axial preload, and rotor damping on the DFT of the system are discussed. The soft-stiff transition phenomenon is observed in terms of the varying supporting stiffness of ACBB wherein deformation is measured under axial preload. The value of rotor unbalanced mass determines the nonlinear characteristics of FRS. The results provide an important reference for dynamic performance evaluation and vibration isolation device design of aerospace FRS.

本文研究了由角接触球轴承（ACBB）支撑的航空飞轮转子系统（FRS）的动态力传递能力（DFT）。在Sjovall公式中考虑了组合载荷和接触角变化的影响，以准确解决ACBB的载荷分布和非线性刚度。随后，通过考虑ACBB的非线性刚度特性，建立FRS的横向振动模型。通过谐波平衡法和弧长连续法求解系统的DFT，并确定结果的稳定性。利用数值积分和动态测试来验证谐波平衡结果的准确性。基于提出的模型，讨论了转子不平衡励磁，轴向预载和转子阻尼对系统DFT的影响。根据ACBB的变化支撑刚度观察到了软硬过渡现象，其中变形是在轴向预紧力下测量的。转子不平衡质量的值决定了FRS的非线性特性。研究结果为航空FRS的动态性能评估和隔振装置设计提供了重要的参考。