Study Of Bump-Type Foil Aero-Dynamic Bearing’s Application On An Aero-Engine

A bump-type foil aero-dynamic bearing is effective and successfully designed.It mainly contains a basic foil and plate foil.It has been applied on many fields thanks to its high rotate speeds,high stability and environmental friendly.Its application prospect is valuable.This thesis aims to study on application of bump-type aero-dynamic bearings on a type of aero-engine.Firstly,the thesis explains the basic theorem and principles of aero-dynamic bearings.Also,the thesis introduces link-spring model,which can be used to calculate the equivalent stiffness of bump-type foil.Through an example,relative parameters of bump-type foil are proposed.According to the study,equivalent stiffness increases as the opening angle of bump foil increases;load of bearing increases with the increasing of rotate speed,eccentricity or environment pressure.According to parameters of an aero-engine,design a feasible bump-type foil bearing,and calculate the bearing’s parameters.Use MATLAB GUI,achieve visualization of the program.In the end,the thesis proves feasibility of cooling of the bearing through thermodynamic calculations.