Rotor Drop Characteristics of Active Magnetic Bearings under Typical Maneuvering Conditions

Junfei Liao; Xiaohu Wang

doi:10.54691/c31m1y42

Authors

Junfei Liao
Xiaohu Wang

DOI:

https://doi.org/10.54691/c31m1y42

Keywords:

Aero Engines; Active Magnetic Bearings; Protective Bearings; Rotor Drop; Mechanical Loads.

Abstract

To address the critical safety risks of high-speed rotor drop and subsequent rub-impact following the failure of active magnetic bearings (AMBs) in aero-engines, this paper establishes a nonlinear dynamic model for a flexible AMB rotor-protective bearing system that fully couples maneuvering flight loads. The rotor model is constructed based on the Timoshenko beam theory and the finite element method (FEM). By incorporating the Hunt-Crossley nonlinear contact model and the multidimensional maneuvering additional inertial force field, the transient dynamic equations of the system are solved over the entire process using the Newmark-HHT method. Furthermore, the evolutionary laws of the rotor drop impact characteristics under vertical translational overload, rolling maneuvers, and coupled translational-rotational maneuvers are systematically and quantitatively analyzed.

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