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Research Papers: Gas Turbines: Structures and Dynamics

Nonlinear Dynamic Characterization of Oil-Free Wire Mesh Dampers

[+] Author and Article Information
Bugra H. Ertas

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

Huageng Luo

Noise and Vibration Group, Vibrations and Dynamics Laboratory, GE Global Research Center, Niskayuna, NY 12309luoh@crd.ge.com

J. Eng. Gas Turbines Power 130(3), 032503 (Apr 03, 2008) (8 pages) doi:10.1115/1.2836744 History: Received June 20, 2007; Revised October 07, 2007; Published April 03, 2008

The present work focuses on the dynamic characterization of oil-free wire mesh dampers. The research was aimed at determining nonlinear stiffness and damping coefficients while varying the excitation amplitude, excitation frequency, and static eccentricity. Force coefficients were extracted using a forced response method and also a transient vibration method. Due to the nonlinearity of the dampers, controlled amplitude single frequency excitation tests were required for the forced excitation method, whereas the transient response was analyzed using a Hilbert transform procedure. The experimental results showed that eccentricity has minimal influence on force coefficients, whereas increasing excitation amplitude and frequency yields decreasing stiffness and damping trends. In addition to the parameter identification tests, a rotating test was performed demonstrating high-speed damping capability of the oil-free wire mesh dampers to 40,000 rpm, which was also simulated using a nonlinear rotordynamic response to imbalance analysis.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Wire mesh dampers

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Figure 2

Nonrotating forced excitation test setup

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Figure 3

Example forced excitation impedance test: bearing support parameters

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Figure 4

Direct stiffness and damping results for two wire mesh dampers: forced excitation tests

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Figure 5

Al-Khateeb’s stick-slip model (8)

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Figure 6

Transient impact hammer test setup and test matrix

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Figure 7

(a) An impulse response and its Fourier spectrum and (b) raw impulse response and cleaned mode

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Figure 8

Identification results

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Figure 9

Amplitude dependency of the damper characteristics

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Figure 10

Rotordynamic model: long rotor configuration

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Figure 11

Predicted rotordynamics: long rotor with integral wire mesh dampers

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Figure 12

Measured rotordynamics: fixed end synchronous response to imbalance

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