Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings
In vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, th...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2014/309767 |
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| author | Mattias Nässelqvist Rolf Gustavsson Jan-Olov Aidanpää |
| author_facet | Mattias Nässelqvist Rolf Gustavsson Jan-Olov Aidanpää |
| author_sort | Mattias Nässelqvist |
| collection | DOAJ |
| description | In vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, the bearing properties are calculated at a static eccentricity. For tilting-pad bearings, there are no existing analytical expressions for bearing parameters and the bearing parameters are dependent on eccentricity and load angle. The objective of this paper is to present a simplified method to perform numerical simulations on vertical rotors including bearing parameters. Instead of recalculating the bearing parameters in each time step polynomials are used to represent the bearing parameters for present eccentricities and load angles. Numerical results are compared with results from tests performed in a test rig. The test rig consists of two guide bearings and a midspan rotor. The guide bearings are 4-pad tilting-pad bearings. Shaft displacement and strains in the bearing bracket are measured to determine the test rig’s properties. The comparison between measurements and simulated results shows small deviations in absolute displacement and load levels, which can be expected due to difficulties in calculating exact bearing parameters. |
| format | Article |
| id | doaj-art-bddcab35dd4e48fb8ae006a4aaa8fa99 |
| institution | DOAJ |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-bddcab35dd4e48fb8ae006a4aaa8fa992025-08-20T03:23:33ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342014-01-01201410.1155/2014/309767309767Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad BearingsMattias Nässelqvist0Rolf Gustavsson1Jan-Olov Aidanpää2Hydro Power, ÅF, 80320 Gävle, SwedenMechanical and Hydraulic Engineering, Vattenfall R&D, 814 26 Älvkarleby, SwedenMechanics of Solid Materials, Luleå University of Technology, 97187 Luleå, SwedenIn vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, the bearing properties are calculated at a static eccentricity. For tilting-pad bearings, there are no existing analytical expressions for bearing parameters and the bearing parameters are dependent on eccentricity and load angle. The objective of this paper is to present a simplified method to perform numerical simulations on vertical rotors including bearing parameters. Instead of recalculating the bearing parameters in each time step polynomials are used to represent the bearing parameters for present eccentricities and load angles. Numerical results are compared with results from tests performed in a test rig. The test rig consists of two guide bearings and a midspan rotor. The guide bearings are 4-pad tilting-pad bearings. Shaft displacement and strains in the bearing bracket are measured to determine the test rig’s properties. The comparison between measurements and simulated results shows small deviations in absolute displacement and load levels, which can be expected due to difficulties in calculating exact bearing parameters.http://dx.doi.org/10.1155/2014/309767 |
| spellingShingle | Mattias Nässelqvist Rolf Gustavsson Jan-Olov Aidanpää Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings International Journal of Rotating Machinery |
| title | Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings |
| title_full | Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings |
| title_fullStr | Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings |
| title_full_unstemmed | Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings |
| title_short | Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings |
| title_sort | experimental and numerical simulation of unbalance response in vertical test rig with tilting pad bearings |
| url | http://dx.doi.org/10.1155/2014/309767 |
| work_keys_str_mv | AT mattiasnasselqvist experimentalandnumericalsimulationofunbalanceresponseinverticaltestrigwithtiltingpadbearings AT rolfgustavsson experimentalandnumericalsimulationofunbalanceresponseinverticaltestrigwithtiltingpadbearings AT janolovaidanpaa experimentalandnumericalsimulationofunbalanceresponseinverticaltestrigwithtiltingpadbearings |