Aero-engine intermediate bearing wear fault vibration response simulation method

Abstract

The invention provides an aero-engine intermediate bearing wear fault vibration response simulation method. Firstly, relevant parameters of an intermediate bearing are determined; wherein the abrasionfault is characterized by the total abrasion loss and the differential abrasion loss; calculating the initial position and speed of an intermediate bearing element according to the related parametersof the intermediate bearing; the contact deformation amount and the contact length are determined; calculating the contact load between the intermediate bearing elements by using an intermediate bearing fault kinetic model; calculating and storing the position and the speed of the mass center of the intermediate bearing element at the next moment, simulating and calculating contact after the simulation time is reached, and calculating a time domain graph, an envelope spectrum and a statistical index of the vibration response signal of the intermediate bearing by utilizing the position and thespeed data of the mass center of the intermediate bearing element; the method is provided on the basis of the complex dynamic model of the intermediate bearing, the wear fault is represented throughthe total wear amount and the differential wear amount, and accurate vibration response prediction can be carried out on the common wear fault of the intermediate bearing of the aero-engine.

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. ...

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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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