A Simulation Method for Vibration Response of Aeroengine Intermediate Bearing Wear Fault

Abstract

The present invention proposes a vibration response simulation method for the wear fault of an aero-engine intermediate bearing. First, the relevant parameters of the intermediate bearing are determined, wherein the wear fault is characterized by the overall wear amount and the differential wear amount, and then the intermediate bearing element is calculated according to the relevant parameters of the intermediate bearing. The initial position and velocity, contact deformation and contact length, using the intermediary bearing fault dynamics model to calculate the contact load between the intermediary bearing elements, and then calculate and store the center of mass position and velocity of the intermediary bearing elements at the next moment, until the simulation After a period of time, the contact is simulated and calculated, and the time domain diagram, envelope spectrum and statistical indicators of the vibration response signal of the intermediate bearing are calculated by using the center of mass position and velocity data of the intermediate bearing element; the invention is proposed based on the complex dynamic model of the intermediate bearing, and through the overall wear amount To characterize the wear fault by using the differential wear amount and the differential wear amount, it can accurately predict the vibration response of the common wear fault of the aero-engine intermediate bearing.

Description

technical field [0001] The invention belongs to the field of mechanical fault diagnosis, and in particular relates to a vibration response simulation method for an aeroengine intermediate bearing wear fault. Background technique [0002] As an important part of contemporary mechanical equipment, bearings are widely used in aero-engines, gas turbines, high-speed machine tools and other equipment. At present, aero-engines mostly adopt a dual-rotor structure design, in which the intermediary bearing is a key component connecting the low-pressure rotor and the high-pressure rotor. It has been working under high temperature, high speed, and poor lubrication conditions for a long time, and the failure rate is relatively high. The existence of many friction pairs leads to wear of the bearing during use. When the wear faults accumulate to a certain extent, it will have an immeasurable impact on the normal operation of the bearing and even the efficient operation of the aero-engine. ...

AI Technical Summary

Problems solved by technology

Most of the research on vibration response simulation methods of fault-intermediate bearings is based on pseudo-static models, pseudo-dynamic models or simple dynamic models, which cannot consider complex dynamic behaviors such as tilting and skewing of rolling elements, inner and outer rings, etc., resulting in vibration response simulation The result is not accurate enough

In addition, there is no research on the vibration response simulation method of wear failure of aero-engine intermediate bearings using complex dynamic models

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