Dynamic analysis of centrifugal machines rotors supported on ball bearings by combined application of 3D and beam finite element models

15th International Scientific and Engineering Conference Hermetic Sealing, Vibration Reliability and Ecological Safety of Pump and Compressor Machinery HERVICON+PUMPS-2017

机械制造;生态环境科学

Pavlenko, I.V.^1 ; Simonovskiy, V.I.^1 ; Demianenko, M.M.^1

Department of General Mechanics and Machine Dynamics, Sumy State University, 2 Rymskogo-Korsakova Street, Sumy

40007, Ukraine^1

关键词: 3-D finite elements;    Beam finite elements;    Bearing stiffness;    Centrifugal machine;    Centrifugal oil pumps;    Critical frequencies;    Forced oscillations;    Residual unbalance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/233/1/012053/pdf
DOI  :  10.1088/1757-899X/233/1/012053

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This research paper is aimed to investigating rotor dynamics of multistage centrifugal machines with ball bearings by using the computer programs "Critical frequencies of the rotor" and "Forced oscillations of the rotor," which are implemented the mathematical model based on the use of beam finite elements. Free and forces oscillations of the rotor for the multistage centrifugal oil pump NPS 200-700 are observed by taking into account the analytical dependence of bearing stiffness on rotor speed, which is previously defined on the basis of results' approximation for the numerical simulation in ANSYS by applying 3D finite elements. The calculations found that characteristic and constrained oscillations of rotor and corresponded to them forms of vibrations, as well as the form of constrained oscillation on the actual frequency for acceptable residual unbalance are determined.