Identification of Modal Parameters of an Elastic Rotor with Oil Film Bearings
The dynamic behavior of many rotating machines e.g., turbines, compressors, pumps is influenced by stiffness and damping characteristics of nonconservative effects like oil film forces, forces in seals etc. It is important to know that besides the forced unbalance vibrations also unstable vibrations may occur, caused by the abovementioned selfexciting mechanisms /1/. To have a better understanding of the vibration behavior of rotating systems, the knowledge of the modal parameters — eigenvalues and eigenvectors — is very valuable.
KeywordsModal Parameter Frequency Response Function Natural Mode Journal Bearing Natural Vibration
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- 1.Wachel, J.C., “Rotordynamic Instability Field Problems”, NASA Conference Publication 2250, Rotordynamic Instability Problems in High Performance Turbomachinery, proceedings of a workshop held at Texas AM University, May 10–12, 1982, pp. 1–19.Google Scholar
- 2.Nordmann, R., “Ein Näherungsverfahren zur Berechnung der Eigenwerte und Eigenformen von Turborotoren mit Gleitlagern, Spalterregung, äußerer und innerer Dämpfung”, Dissertation TH Darmstadt, 1974.Google Scholar
- 3.Morton, P.G., “The Derivation of Bearing Characteristics by Means of Transient Excitation Applied Directly to a Rotating Shaft”, IUTAM-Symposium, Dynamics of Rotors, Lyngby, Denmark, Springer Verlag 1975, pp. 350–379.Google Scholar
- 4.Klostermann, A. L., “On the Experimental Determination and Use of Modal Representation of Dynamic Characteristics”, Ph. D. dissertation, University of Cincinnati, 1971.Google Scholar
- 5.Nordmann, R., “Modal Parameter Identification and Snsitivity Analysis in Rotating Machinery”, International Conference “Rotordynamic Problems in Power Plants”, Proceedings of the IFTOMM Conference, Rome, Italy, Sept. 29-Oct. 1, 1982, pp. 95–102.Google Scholar