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Material and microslip damping in a rotor taking gravity and anisotropic bearings into account
Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
2001 (English)In: Journal of Vibration and Acoustics-Transactions of the ASME, ISSN 1048-9002, E-ISSN 1528-8927, Vol. 123, no 1, 30-35 p.Article in journal (Refereed) Published
Abstract [en]

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 nor affected by gravity which microslip damping is.

Place, publisher, year, edition, pages
2001. Vol. 123, no 1, 30-35 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-49393OAI: oai:DiVA.org:liu-49393DiVA: diva2:270289
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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Wettergren, Håkan

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