Abstract In this paper, the proper orthogonal decomposition (POD) method is first time apply to the dimension reduction of dual rotor-bearing experiment rig which is similar to an aero-engine rotor. The basic theory of the POD method and the application in dynamical system are introduced. The supporting bearing nonlinearity and the coupling misalignment of high and low pressure rotors are considered, and the dynamical model is established by finite element method based on dual rotor experiment rig. The frequency behaviors of dual rotor-bearing coupling misalignment response are discussed via comparing the numerical and experiment results to verify the efficiency of the model. The POD method is used for dimension reduction of rotor-bearing system, and the dynamical behaviors of the reduced-order model (ROM) are compared with the full order system (FOM) and experiment to verify the higher computational efficiency and accuracy of the POD method. These results in this paper can provide engineering guidance to actual dual rotor-bearing system with coupling misalignment fault.

中文翻译：

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POD法在带联轴器不对中的双转子轴承系统中的应用

摘要 本文首次将适当正交分解(POD)方法应用于类似航空发动机转子的双转子轴承实验台的降维。介绍了POD方法的基本理论及其在动力系统中的应用。考虑了支承轴承的非线性和高低压转子的耦合不对中，基于双转子实验台采用有限元方法建立了动力学模型。通过比较数值和实验结果，讨论了双转子轴承耦合不对中响应的频率行为，以验证模型的有效性。POD方法用于转子轴承系统的降维，将降阶模型（ROM）的动力学行为与全阶系统（FOM）进行比较和实验，以验证POD方法具有更高的计算效率和准确性。本文的研究结果可为实际存在联轴器不对中故障的双转子轴承系统提供工程指导。