Constant-pressure pre-tightening angular contact bearing rigidity numerical correction method considering vibration influence

Abstract

The invention discloses a constant-pressure pre-tightening angular contact bearing rigidity numerical correction method considering vibration influence. The method comprises the following steps: 1, constructing a finite element model of a rotor system; 2, constructing an angular contact bearing simplified model; 3, solving a bearing load-rigidity curve, and assigning an initial value to rigidity;4, carrying out modal shape trial calculation on the rotor system containing the bearing equivalent spring model; and 5, carrying out bearing rigidity iterative correction considering the vibration load. A two-dimensional equivalent spring model is constructed by using Matrix27 in ANSYS software, so that the calculation amount of carrying out overall numerical simulation of the rotor system is reduced on the premise of ensuring the calculation precision. When the spring rigidity is corrected, the vibration mode characteristics of a target structure are combined, main factors influencing the bearing rigidity are comprehensively considered, and the influence of steady-state vibration and pre-tightening force on the bearing rigidity is emphatically inspected. A macroscopic rotor system and amicroscopic bearing mechanical analysis model can be effectively communicated, and a large number of application requirements exist in actual work.

Description

technical field [0001] The invention belongs to the technical field of vibration reliability of rotor structures, and specifically relates to an iterative correction method for angular contact bearing stiffness that can consider vibration loads under constant pressure and preload conditions. Background technique [0002] Structural damage caused by resonance is a common fault in the rotor structure, and avoiding resonance under actual working conditions is an important concern in the design of the rotor structure. Angular contact bearings, as a commonly used connection between the rotor structure and the load-bearing frame, not only have an important impact on the overall resonance frequency of the rotor system, but also its stress status under resonance conditions should also receive special attention. [0003] When the rotor system resonates, the bearing as the connecting part of the rotor and the stator will change under load, and the contact state between the rolling ele...

AI Technical Summary

Problems solved by technology

Many researchers have carried out a large number of special studies on bearings, and proposed a mechanical analysis model that considers the contact between rolling elements and raceways, which improves the simulation accuracy, but makes the local model of the bearing too complex and greatly increases the amount of calculation. It is difficult to carry out the dynamic simulation of the complex rotor system as a whole

Therefore, so far, a bearing numerical simulation model that can not only consider the influence of the vibration of the whole machine on the working state of the bearing, but also satisfy the accuracy of the modal analysis results of the whole machine, and perform dynamic analysis of the whole machine for the complex rotor system has not yet been given. However, this kind of model that can effectively connect the macroscopic rotor system and the microscopic bearing mechanical analysis has a large demand in practical work.

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