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Modal analysis of rotor on piecewise linear journal bearings under seismic excitation

Gaganis Vasileios, Zisimopoulos, A, Nikolakopoulos, Pantelēs, Papadopoulos C.

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URIhttp://purl.tuc.gr/dl/dias/67A54C54-0C80-461E-B025-8B209DE4233B-
Identifierhttps://doi.org/10.1115/1.2893963-
Identifierhttp://vibrationacoustics.asmedigitalcollection.asme.org/article.aspx?articleid=1470141-
Languageen-
Extent7 pagesen
TitleModal analysis of rotor on piecewise linear journal bearings under seismic excitationen
CreatorGaganis Vasileiosen
CreatorΓαγανης Βασιλειοςel
CreatorZisimopoulos, Aen
CreatorNikolakopoulos, Pantelēsen
CreatorPapadopoulos C.en
PublisherThe American Society of Mechanical Engineersen
Content SummaryA rotor bearing system is expected to exhibit large vibration amplitudes when subjected to a large seismic excitation. It is possible that these vibrations can lead to large values the eccentricity of the bearings. Then the bearing is operated in highly nonlinear region because the stiffness and the damping coefficients are nonlinear as functions of the eccentricity. To solve this problem numerical integration must be performed with high cost in computer time. The idea of this paper was to divide the nonlinear area into more areas where the stiffness and damping coefficients could be considered to be constants. In other words the bearing coefficients are considered to be piecewise constant. The excitation due to the earthquake is modelled as a movement of the base of the bearings using the El Centro data for the acceleration. Then a simplified modal analysis for each of these piecewise linear regions can be performed. The equation of motion of the rotor contains rotational speed depended terms, known as gyroscopic terms, and terms due to base excitation. The response and the variation of the dynamic properties of this complicated rotor bearing system are investigated and presented.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-11-07-
Date of Publication1999-
SubjectAutomatic computersen
SubjectAutomatic data processorsen
SubjectComputer hardwareen
SubjectComputing machines (Computers)en
SubjectElectronic brainsen
SubjectElectronic calculating-machinesen
SubjectElectronic computersen
SubjectHardware, Computeren
Subjectcomputersen
Subjectautomatic computersen
Subjectautomatic data processorsen
Subjectcomputer hardwareen
Subjectcomputing machines computersen
Subjectelectronic brainsen
Subjectelectronic calculating machinesen
Subjectelectronic computersen
Subjecthardware computeren
SubjectQuakes (Earthquakes)en
Subjectearthquakesen
Subjectquakes earthquakesen
Bibliographic CitationB. J. Gaganis, A. K. Zisimopoulos, P. G. Nikolakopoulos and C. A. Papadopoulos, “Modal analysis of rotor on piecewise linear journal bearings under seismic excitation”, Journal of Vibration and Acoustics, vol. 121, no. 2, pp. 190-196, 1999. doi:10.1115/1.2893963en

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