THE UNBALANCE RESPONSE OF A FLEXIBLE ROTOR MOUNTED ON UNCENTRALIZED SQUEEZE-FILM DAMPER BEARINGS

Document Type : Original Article

Authors

1 Lecturer, Aeronautical Department, Military Technical College, Cairo, EGYPT.

2 Head of Applied Mechanics Group, School of Mechanical Engineering, Cran-field Institute of Technology, Bedford, ENGLAND.

Abstract

This paper deals with the steady-state response of a single disc flexible. rotor supported on two uncentralized squeeze-film damper bearings and sub-jected to varying degrees of unbalance. The measured responseil-on an exp-erimental rotor operating to speeds exceeding its first bending critical show that the uncentralized squeeze-film damper bearing has a very desira-ble effect under the abusive conditions of large unbalance. The unbalance level was increased by a factor of three in some tests and yet the corresponding vibrational amplitude of the disc, at the first bending critical speed, was increased by less than 30 %. The results predicted :
from a computer simulation study, where the equations of motion are in-tegrated forward in time until steady-state orbits are reached and aut-omatically plotted, show good qualitative agreement with the experimental results.

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