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Research Papers: Gas Turbines: Structures and Dynamics

Compliant Hybrid Journal Bearings Using Integral Wire Mesh Dampers

[+] Author and Article Information
Bugra H. Ertas

Rotating Equipment Group, Vibration and Dynamics Laboratory, GE Global Research Center, Niskayuna, NY 12309ertas@research.ge.com

J. Eng. Gas Turbines Power 131(2), 022503 (Dec 22, 2008) (11 pages) doi:10.1115/1.2967476 History: Received March 30, 2008; Revised April 07, 2008; Published December 22, 2008

The following work presents a new type of hybrid journal bearing developed for enabling oil-free operation of high performance turbomachinery. The new design integrates compliant hydrostatic-hydrodynamic partitioned bearing pads with two flexibly mounted integral wire mesh dampers. The primary aim of the new bearing configuration was to maximize the load-carrying capacity and effective damping levels while maintaining adequate compliance to misalignment and variations in rotor geometry. The concept of operation is discussed along with the description of the bearing design. Several experiments using room temperature air as the working fluid were performed that demonstrate proof of concept, which include lift-off tests, bearing load tests, and rotordynamic characterization tests. The experiments demonstrate stable operation to 40,000 rpm (2.8×106 DN) of a 2.750 in. (70 mm) diameter bearing. In addition to the experimental results, an analytical model is presented for the compliant bearing system. The aeroelastic theory couples the steady state numerical solution of the compressible Reynolds flow equation with a flexible structure possessing translational and rotational compliance. This was achieved by formulating a fluid-structure force balance for each partitioned bearing pad while maintaining a global mass flow balance through the hydrostatic restrictors and bearing lands. Example numerical results for pad pressure profile, film thickness, torque, and leakage are shown.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Various types of gas lubricated journal bearings

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Figure 2

Compliant hybrid journal bearing with IWMD

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Figure 3

Generation II style single piece bearing housing design and concept of operation

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Figure 4

Vibration response: ultrahigh-speed test to 40 krpm (6.2 bar supply pressure and 200 N bearing load)

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Figure 5

Test setup for lift-off tests and load tests

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Figure 6

Modes of operation

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Figure 7

Experimental setup for measuring rotordynamic force coefficients

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Figure 8

Static displacement tests

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Figure 9

Rotordynamic coefficients: 200 N Y direction static load and X and Y spectral vibration amplitudes: 0.0127 mm

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Figure 11

Algorithm flowchart for bearing code and sample analysis results

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Figure 12

Integral squeeze-film damper with flexure pivot bearing

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