Efficient quantitative modeling method for impeller-bearing-rotor system

Abstract

The invention discloses an efficient quantitative modeling method for an impeller-bearing-rotor system, and the method comprises the steps: 1, respectively building a rotating shaft kinetic model andan impeller kinetic model through an iron-wood-octane beam finite element model and a three-dimensional entity finite element model, and building a kinetic model of a rolling bearing through a five-degree-of-freedom lumped parameter model; 2, establishing at least two six-degree-of-freedom virtual main nodes on a common connection interface of an impeller and a rotating shaft in the impeller dynamic model; 3, constructing non-matching displacement coordination transformation from the entity node to the virtual main node; and 4, performing order reduction on the impeller model by adopting a fixed interface modal synthesis method, and integrating the impeller model, the rotating shaft model and the bearing model to obtain an order reduction model of the whole impeller-bearing-rotor system. According to the method, the analysis efficiency of the rotor kinetic model can be improved, the order of the model is reduced, and a technical support is provided for modeling, analyzing and solving work of large rotating machinery.

Description

technical field [0001] The invention belongs to the field of rotor dynamics modeling and analysis, in particular to an efficient quantitative modeling method of an impeller-bearing-rotor system. Background technique [0002] Large rotating machinery is widely used in mechanical devices including aeroengines, axial compressors and turbine engines, and is a very important high-end equipment in the national economy. It plays a very important role in the fields of electric power, aviation, machinery, chemical industry, textile and so on. [0003] The impeller-bearing-rotor system, as the core functional part of these high-end equipment, works at high speed and heavy load for a long time, its dynamic characteristics directly determine the dynamic performance and working efficiency of the whole machine. At the same time, the rotor system in the working process Factors such as high speed and heavy load seriously affect its dynamic behavior, causing significant changes in its dynam...

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Problems solved by technology

[0004] At present, research at home and abroad either focuses on the modeling and analysis of the impeller structure, or greatly simplifies the impeller, and focuses on the analysis of the rotor system. Only a small amount of research uses the concentrated parameter model to construct the qualitative analysis of the impeller-bearing-rotor system. However, due to the oversimplification of these qualitative analysis models, it is difficult to achieve accurate and quantitative analysis and calculation of the complex impeller-bearing-rotor system, and the finite element modeling of the impeller-bearing-rotor system is difficult to directly use the three-dimensional finite element model. Requires extremely high computational requirements and is extremely cumbersome

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