Transient intrinsic orthogonal decomposition method applied to coupled fault rotor-bearing system

Abstract

The invention discloses a transient intrinsic orthogonal decomposition method applied to a coupled fault rotor-bearing system. The method comprises the following steps: firstly, establishing a 24-degree-of-freedom rotor-bearing system model with cracks and rub-impact coupling faults, then providing a transient intrinsic orthogonal decomposition (TPOD) dimensionality reduction method to carry out dimensionality reduction on the rotor-bearing system model, comparing the model with a single fault rotor system, namely a crack rotor, a rub-impact rotor and a fault rotor model containing nonlinear oil film force (an original system), and analyzing the dynamic characteristics of the rotor-bearing system with the coupling fault. The dimensionality of a coupling fault simplified model after dimensionality reduction is determined by adopting a POM energy method, and the effectiveness of a TPOD dimensionality reduction method is verified by comparing bifurcation diagrams. The dimension reduction model obtained through the method can well keep the dynamic characteristics of an original model, meanwhile, the dimension reduction model can be applied to a rotor model supported by a loose sliding bearing or a ball bearing, application of the dimension reduction method in a coupling fault rotor system is popularized, and the dimension reduction efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of rotor-bearing systems, and in particular relates to a transient intrinsic orthogonal decomposition method. Background technique [0002] The impact of faults on rotating machinery on its own dynamic behavior has always been a research hotspot. The existence of faults may affect the dynamic behavior of the structure, and in severe cases, it will cause damage to the rotating machinery and have catastrophic consequences. For the high-dimensional nonlinear dynamic characteristics of the faulty rotor system, although an accurate dynamic model can be established, it is difficult to conduct accurate nonlinear dynamic characteristics analysis due to its huge dimension. Therefore, it is necessary to conduct dimension reduction research on the shaft structure model, and various dimension reduction methods can be used, such as the central manifold method, intrinsic orthogonal decomposition (POD) method, Galerkin met...

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Problems solved by technology

[0002] The impact of rotating machinery faults on their own dynamic behavior has always been a research hotspot. The existence of faults may affect the dynamic behavior of the structure. In severe cases, it will cause damage to the rotating machinery and have catastrophic consequences.

For the high-dimensional nonlinear dynamic characteristics of the faulty rotor system, although an accurate dynamic model can be established, it is difficult to analyze the accurate nonlinear dynamic characteristics due to its huge dimension

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