Bearing dynamic performance analysis method considering influence of rotor and elastic support

Abstract

The invention provides a bearing dynamic performance analysis method considering the influence of a rotor and an elastic support, and the method comprises the steps: calculating the acting force of a rolling body and a ferrule through combining the force balance relation of a bearing-rotor-elastic support system; calculating the acting force of the rolling body, the retainer and the lubricating oil in combination with oil supply conditions; solving a rolling body and retainer motion differential equation to obtain rolling body and retainer motion; solving the corrected motion states of the rolling body and the retainer according to a motion differential equation of the supporting substructure, and calculating the performance parameters of the bearing at the moment and the constraint reaction force of the supporting substructure; solving a rotor motion differential equation to obtain rotor displacement and speed response; and substituting the displacement of the rotor node where the bearing is located into the bearing mechanical model, and repeating the process to obtain the time domain response of the bearing-rotor-elastic support system in a preset time period. According to the method, the coupling relation among the lubrication effect, the holder vibration, the rotor inertia and the elastic support deformation is comprehensively considered, and a theoretical method is provided for introducing the influence of the elastic support and the rotor during bearing performance simulation.

Description

technical field [0001] The disclosure relates to the technical field of mechanical dynamics, in particular to a method for analyzing the dynamic performance of a bearing considering the influence of rotors and springs. Background technique [0002] Rolling bearings are widely used in various rotating machines such as aero-engines, gas turbines, and rocket engines. Elastic bearings are used to cooperate with rolling bearings to support the work of the rotor system and adjust the critical speed region of the rotor system. The damping and deformation of the elastic bearings can absorb part of the vibration of the rotor. , and then reduce the impact on the components inside the bearing. A large number of designs and tests have found that the design parameters of the rotor and spring will affect the performance of the rolling bearing. Unreasonable design of the spring and rotor system will increase the failure rate of the bearing. [0003] In order to improve the cooperative perf...

AI Technical Summary

Problems solved by technology

At present, the bearing-rotor-spring model established based on the existing technology can be divided into two categories: one category simplifies the bearing or rotor model of the system, and this type of model cannot truly reflect the slipping effect inside the bearing, the movement of the cage and the deformation of the rotor , Coupling law of motion inertia

Another type of model has preliminarily established a model and algorithm for the coupling analysis of the complete dynamics of the bearing and the rotor and the bearing seat. However, in order to stabilize the calculation, the algorithm needs to introduce artificially increased damping to the support on the one hand, and the calculation results are uncertain. On the one hand, it is difficult for this model to deal with the model with large difference between elastic support, rotor stiffness and bearing stiffness, because this type of model has the characteristics of coupling multi-rigid body motion and large deformation motion, and ordinary modeling and solving algorithms are used for this type of model. The model is prone to failure, and the stability of the numerical solution of this type of model needs to be further improved

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