The paper is concerned with material and microslip damping in a rotor. The horizontal rotor is carried by anisotropic bearings, which means that the shaft feels three different frequencies, the rotational frequency and the difference and the sum of the rotational and vibrational frequencies. When material damping is studied, these three frequencies lead to three different equivalent viscous damping constants and the dissipated energy can be solved analytically. The rotor slot wedges in a turbine generator are used as an example of microslip damping. In this case the damping is nonlinear and the results are obtained through numerical simulations. The results show that these two different internal damping sources give both similarities and dissimilarities. The sign change and different magnitude of the dissipated energy running sub- or supercritical are the same. However the dissipated energy for material damping is not affected by gravity which microslip damping is.
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January 2001
Technical Papers
Material and Microslip Damping in a Rotor Taking Gravity and Anisotropic Bearings Into Account
Ha˚kan L. Wettergren
Ha˚kan L. Wettergren
Department of Mechanical Engineering, Linko¨ping University, SE-58183 Linko¨ping, Sweden
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Ha˚kan L. Wettergren
Department of Mechanical Engineering, Linko¨ping University, SE-58183 Linko¨ping, Sweden
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received Oct. 1999; revised Aug. 2000. Associate Technical Editor: J. Q. Sun.
J. Vib. Acoust. Jan 2001, 123(1): 30-35 (6 pages)
Published Online: August 1, 2000
Article history
Received:
October 1, 1999
Revised:
August 1, 2000
Citation
Wettergren, H. L. (August 1, 2000). "Material and Microslip Damping in a Rotor Taking Gravity and Anisotropic Bearings Into Account ." ASME. J. Vib. Acoust. January 2001; 123(1): 30–35. https://doi.org/10.1115/1.1325410
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