Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery
Mechanical failures of a complex machine such as rotor widely used in severe conditions often require specialized knowledge, technical expertise, and imagination to prevent its rupture. In this paper, a model for analyzing excitation of a coupled lateral-torsional vibrations of a shaft system in an...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2020/8816191 |
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| author | Bernard Xavier Tchomeni Desejo Filipeson Sozinando Alfayo Alugongo |
| author_facet | Bernard Xavier Tchomeni Desejo Filipeson Sozinando Alfayo Alugongo |
| author_sort | Bernard Xavier Tchomeni |
| collection | DOAJ |
| description | Mechanical failures of a complex machine such as rotor widely used in severe conditions often require specialized knowledge, technical expertise, and imagination to prevent its rupture. In this paper, a model for analyzing excitation of a coupled lateral-torsional vibrations of a shaft system in an inviscid fluid is proposed. The model considers the recurrent contact of the vibrating shaft to a fixed stator. The simplified mathematical model of the rotor-stator system is established based on the energy principle. The dynamic characteristics of the fluid-rotor system are studied, and the features of rub-impact are extracted numerically and validated experimentally under the effects of the unbalance and the hydrodynamic forces. The main contribution of this article is in extraction and identification of the rub features in an inviscid medium which proved to be complex by the obstruction of the fluid and required the use of appropriate signal processing tools. The results through a synchrosqueezing wavelet transform indicated that the exciting fluid force could significantly attenuate the instability and amplitude of rubbing rotor. The experimental results demonstrated that for half the first critical speed, the subharmonic 1/2×Ω and the irregular orbit patterns provide good indices for rub detection in an inviscid fluid of the rotating shafts. Finally, it is revealed that the instantaneous frequency extraction based on wavelet synchrosqueezing is a useful tool to identify the weak and hidden peak harmonics localised in the time-frequency maps of the fluid-rotor system. |
| format | Article |
| id | doaj-art-d5a29b3e371a4c5da575aeabdee41c73 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-d5a29b3e371a4c5da575aeabdee41c732025-02-03T06:43:41ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342020-01-01202010.1155/2020/88161918816191Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating MachineryBernard Xavier Tchomeni0Desejo Filipeson Sozinando1Alfayo Alugongo2Vaal University of Technology, Mechanical Engineering Department, South AfricaVaal University of Technology, Mechanical Engineering Department, South AfricaVaal University of Technology, Mechanical Engineering Department, South AfricaMechanical failures of a complex machine such as rotor widely used in severe conditions often require specialized knowledge, technical expertise, and imagination to prevent its rupture. In this paper, a model for analyzing excitation of a coupled lateral-torsional vibrations of a shaft system in an inviscid fluid is proposed. The model considers the recurrent contact of the vibrating shaft to a fixed stator. The simplified mathematical model of the rotor-stator system is established based on the energy principle. The dynamic characteristics of the fluid-rotor system are studied, and the features of rub-impact are extracted numerically and validated experimentally under the effects of the unbalance and the hydrodynamic forces. The main contribution of this article is in extraction and identification of the rub features in an inviscid medium which proved to be complex by the obstruction of the fluid and required the use of appropriate signal processing tools. The results through a synchrosqueezing wavelet transform indicated that the exciting fluid force could significantly attenuate the instability and amplitude of rubbing rotor. The experimental results demonstrated that for half the first critical speed, the subharmonic 1/2×Ω and the irregular orbit patterns provide good indices for rub detection in an inviscid fluid of the rotating shafts. Finally, it is revealed that the instantaneous frequency extraction based on wavelet synchrosqueezing is a useful tool to identify the weak and hidden peak harmonics localised in the time-frequency maps of the fluid-rotor system.http://dx.doi.org/10.1155/2020/8816191 |
| spellingShingle | Bernard Xavier Tchomeni Desejo Filipeson Sozinando Alfayo Alugongo Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery International Journal of Rotating Machinery |
| title | Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery |
| title_full | Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery |
| title_fullStr | Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery |
| title_full_unstemmed | Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery |
| title_short | Influences of Hydrodynamic Forces on the Identification of the Rotor-Stator-Rubbing Fault in a Rotating Machinery |
| title_sort | influences of hydrodynamic forces on the identification of the rotor stator rubbing fault in a rotating machinery |
| url | http://dx.doi.org/10.1155/2020/8816191 |
| work_keys_str_mv | AT bernardxaviertchomeni influencesofhydrodynamicforcesontheidentificationoftherotorstatorrubbingfaultinarotatingmachinery AT desejofilipesonsozinando influencesofhydrodynamicforcesontheidentificationoftherotorstatorrubbingfaultinarotatingmachinery AT alfayoalugongo influencesofhydrodynamicforcesontheidentificationoftherotorstatorrubbingfaultinarotatingmachinery |