Blade Excitation by Elliptical Whirling in Viscous-Damped Jet EnginesSource: Journal of Engineering for Gas Turbines and Power:;1981:;volume( 103 ):;issue: 002::page 326Author:N. Klompas
DOI: 10.1115/1.3230724Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An extension of the author’s earlier method of analyzing multi-shaft jet engine dynamics accounting for flexibility of bladed disks is outlined to calculate the first whirl harmonic for given nonlinear characteristics of squeeze-film dampers. A second whirl harmonic, of which experimental verification is found in Campbell’s paper of 1924, is shown induced by orbit ellipticity. The possibility that this harmonic, especially due to backward whirling, may be a source of blade excitation at higher frequencies than currently recognized from linear analysis is discussed by relating some engine experience.
keyword(s): Blades , Jet engines , Whirls , Frequency , Dynamics (Mechanics) , Plasticity , Engines , Dampers AND Disks ,
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| contributor author | N. Klompas | |
| date accessioned | 2017-05-08T23:11:06Z | |
| date available | 2017-05-08T23:11:06Z | |
| date copyright | April, 1981 | |
| date issued | 1981 | |
| identifier issn | 1528-8919 | |
| identifier other | JETPEZ-26765#326_1.pdf | |
| identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/94528 | |
| description abstract | An extension of the author’s earlier method of analyzing multi-shaft jet engine dynamics accounting for flexibility of bladed disks is outlined to calculate the first whirl harmonic for given nonlinear characteristics of squeeze-film dampers. A second whirl harmonic, of which experimental verification is found in Campbell’s paper of 1924, is shown induced by orbit ellipticity. The possibility that this harmonic, especially due to backward whirling, may be a source of blade excitation at higher frequencies than currently recognized from linear analysis is discussed by relating some engine experience. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | Blade Excitation by Elliptical Whirling in Viscous-Damped Jet Engines | |
| type | Journal Paper | |
| journal volume | 103 | |
| journal issue | 2 | |
| journal title | Journal of Engineering for Gas Turbines and Power | |
| identifier doi | 10.1115/1.3230724 | |
| journal fristpage | 326 | |
| journal lastpage | 330 | |
| identifier eissn | 0742-4795 | |
| keywords | Blades | |
| keywords | Jet engines | |
| keywords | Whirls | |
| keywords | Frequency | |
| keywords | Dynamics (Mechanics) | |
| keywords | Plasticity | |
| keywords | Engines | |
| keywords | Dampers AND Disks | |
| tree | Journal of Engineering for Gas Turbines and Power:;1981:;volume( 103 ):;issue: 002 | |
| contenttype | Fulltext |