Efficient quantitative modeling method for impeller-bearing-rotor system

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, t