Investigation of critical frequencies of the centrifugal compressor rotor with taking into account stiffness of bearings and seals | Journal of Engineering Sciences

Investigation of critical frequencies of the centrifugal compressor rotor with taking into account stiffness of bearings and seals

Author(s): Pavlenko I. V.1, Simonovsky V. I.1, Pitel’ J.2, Verbovyi A. E.1, Demianenko M. M.1

Affilation(s):

1 Sumy State University, 2 Rymskogo-Korsakova St., 40007, Sumy, Ukraine
2 Technical University of Košice, 1 Bayerova St., 08001, Prešov, Slovakia

*Corresponding Author’s Address:  i.pavlenko@omdm.sumdu.edu.ua

Issue: Volume 4; Issue 1 (2017)

Dates:
Paper received: April 14, 2017
The final version of the paper received: May 11, 2017
Paper accepted online: May 15, 2017

Citation:
Pavlenko I. V. Investigation of critical frequencies of the centrifugal compressor rotor with taking into account stiffness of bearings and seals / I. V. Pavlenko, V. I. Simonovsky, J. Pitel’, A. E. Verbovyi, M. M. Demianenko // Journal of Engineering Sciences. —  Sumy : Sumy State University, 2017. — Volume 4, Issue 1. — P. C1-C6.

DOI: 10.21272/jes.2017.4(1).c1

Research Area: Dynamics and Strength. Hermomechanics

Abstract: In this paper the implementation of the mathematical model for rotor free oscillations of centrifugal machines is considered with the use of the computer program “Critical frequencies of the rotor”. The advantage of the program is the possibility of taking into account any advance given analytic dependence of support and seal stiffness on the rotor speed. As a result of numerical calculation on the example of the multistage centrifugal compressor 295GTS2-190/44-100M eigenfrequencies, critical frequencies and corresponding mode shapes are defined. The credibility of the proposed mathematical model is confirmed by theorem of the mutual position for spectrum of eigenfrequencies and correspondent critical frequencies, as well as by comparing the results of dynamic calculation in the program “Critical frequencies of the rotor” with the results of numerical simulation in ANSYS using the 3D finite element model and drawing the Campbell diagram.

Keywords: finite element method, stiffness matrix, matrix of inertia, free oscillations, eigenfrequency, Campbell diagram.

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Scientific journal "The Journal of Engineering Sciences"
ISSN 2312-2498 (Print), ISSN 2414-9381 (Online).

Faculty of Technical Systems and Energy Efficient Technologies
Sumy State University