This report presents a synopsis of the research work. Specific accomplishments are itemized below: (1) Experimental facilities have been developed. This includes a magnetic bearing test rig and an auxiliary bearing test rig. In addition, components have been designed, constructed, and tested for use with a rotordynamics test rig located at NASA Lewis Research Center. (2) A study of the rotordynamics of an auxiliary bearing supported T-501 engine model was performed. (3) An experimental/simulation study of auxiliary bearing rotordynamics has been performed. (4) A rotordynamical model for a magnetic bearing supported rotor system, including auxiliary bearing effects has been developed and simulation studies performed.(5) A finite element model for a foil bearing has been developed and studies of a rotor supported by foil bearings have been performed. (6) Two students affiliated with this project have graduated with M.S. degrees

Flowers, George T.

English

Progress made in the current year is listed, and the following papers are included in the appendix: Steady-State Dynamic Behavior of an Auxiliary Bearing Supported Rotor System; Dynamic Behavior of a Magnetic Bearing Supported Jet Engine Rotor with Auxiliary Bearings; Dynamic Modelling and Response Characteristics of a Magnetic Bearing Rotor System with Auxiliary Bearings; and Synchronous Dynamics of a Coupled Shaft/Bearing/Housing System with Auxiliary Support from a Clearance Bearing: Analysis and Experiment

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Influence of backup bearings and support structure dynamics on the behavior of rotors with active supports

Influence of Back-Up Bearings and Support Structure Dynamics on the Behavior of Rotors With Active Supports

This semiannual status report lists specific accomplishments made on the research of the influence of backup bearings and support structure dynamics on the behavior of rotors with active supports. Papers have been presented representing work done on the T-501 engine model; an experimental/simulation study of auxiliary bearing rotordynamics; and a description of a rotordynamical model for a magnetic bearing supported rotor system, including auxiliary bearing effects. A finite element model for a foil bearing has been developed. Additional studies of rotor/bearing/housing dynamics are currently being performed as are studies of the effects of sideloading on auxiliary bearing rotordynamics using the magnetic bearing supported rotor model

NASA-CR-197438
INFLUENCE OF BACKUP BEARINGS AND SUPPORT STRUCTURE z../'h _i._._
DYNAMICS ON THE BEHAVIOR OF ROTORS WITH ACTIVE SUPPORTS ,_/_
Semi-annual Status Report for Research Grant Number NAG3-1507
submitted to:
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135
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George T. Flowers, Ph.D
Assistant Professor
Department of Mechanical Engineering
Auburn University
Auburn University, AL 36849-5341
Phone: (334) 844-3330
February, 1995
https://ntrs.nasa.gov/search.jsp?R=19950016773 2020-06-16T08:13:27+00:00Z
Progress to Date
This report documents the progress that has been made in the proposed research work since the
first annual report. Substantial progress has been made toward fulfilling the goals of year two.
Specific accomplishments for the past six months are itemized below.
. A paper has been presented that documents the work using the T-501 engine model. The
paper was presented at the Symposium on Nonlinear and Stochastic Dynamics, held at
the 1994ASME Winter Annual Meeting, November 13-18, 1994, Chicago, Illinois. The
paper has also been submitted to the ASME Journal of Vibration and Acoustics.
. A paper that discusses some of the work using the T-501 engine model has been
presented at the First Industry University Symposium on High Speed Civil Transport
Vehicles, December 4-6, 1994, Greensboro, North Carolina. A copy of the paper is
included in the Appendix.
. Development of the experimental facilities has continued. This includes a new design
for the magnetic bearing (shown in Figure 1) and the inclusion of housing dynamics in
an additional test rig (shown in Figure 2).
. A paper that documents an experimental/simulation study of auxiliary bearing
rotordynamics has been accepted for presentation at the 40 _ ASME International Gas
Turbine and Aeroengine Conference, June 5-8, 1995, Houston, Texas. A copy of the
paper is included in the Appendix.
. A paper that describes a rotordynamical model for a magnetic bearing supported rotor
system, including auxiliary bearing effects has been written and submitted to the ASME
15th Biennial Conference on Vibration and Sound, to be held in Boston, Massachusetts,
Sept. 17-21, 1995. A copy of the paper is included in the Appendix.
. A finite element model for a foil bearing has been developed. Rotordynamical studies
of a rotor supported by foil bearings is currently underway.
. Additional studies of rotor/bearing/housing dynamics are currently being performed with
the experimental rig and simulation models.
8, The effects of sideloading on auxiliary bearing rotordynamics is being studied using the
magnetic bearing supported rotor model.
Bibliography
1. Flowers, G.T., Xie, Huajun, and Lawrence, C. "Steady-State Dynamic Behavior of an
2
Auxiliary BearingSupportedRotorSystem," presentedat the Symposium on Nonlinear
and Stochastic Dynamics, held at the 1994 ASME Winter Annual Meeting, November 13-
18, 1994, Chicago, Illinois.
1 Flowers, G.T., Xie, H., and Sinha, S.C., " Dynamic Behavior of a Magnetic Beating
Supported Jet Engine Rotor with Auxiliary Bearings," presented at the First
Industry University Symposium on High Speed Civil Transport Vehicles, Greensboro,
North Carolina, December 4-6, 1994.
o Lawen, James L., lr., and Flowers, George T.,"Synchronous Dynamics of a Coupled
Shaft/Bearing/Housing System With Auxiliary Support From a Clearance Bearing:
Analysis and Experiment," accepted for presentation at the 40 h ASME International Gas
Turbine and Aeroengine Conference, June 5-8, 1995.
. Free, A., Flowers, George T., and Trent, Victor S., "Dynamic Modelling of a Magnetic
Bearing Rotor System Including Auxiliary Bearings," submitted to the ASME 15th
Biennial Conference on Vibration and Noise, Sept. 17-21, 1995, Boston, Massachusetts.
3
Figure 1.a: Magnetic Bearing Supported Rotor Test Rig (Front View)
Figure l.b: Magnetic Bearing Supported Rotor Test Rig (Side View)
ORIGINAl. PAG_
8LACK AND WHITE PHOToGR_F.I_
Figure 2.a: Shaft/Bearing/Housing Rotordynamics Test Rig
Figure 2.b: Shaft/Bearing/Housing Rotordynamics Test Rig (Side View)
5 ORIGINAL PA_E
_LACK AND WHITE PHOTOGRt_F.ri


Influence of Back-Up Bearings and Support Structure Dynamics on the Behavior of Rotors With Active Supports

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