Dynamic Characteristics of Spiral-Grooved Opposed-Hemisphere Gas BearingsSource: Journal of Tribology:;2017:;volume( 139 ):;issue: 003::page 31704DOI: 10.1115/1.4034423Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The traditional eight-coefficient bearing model only considers the translational motion of the bearings and neglects the tilting motion and coupling effects between them. In this paper, the dynamic characteristics of the spiral-grooved opposed-hemisphere gas bearing considering five degrees-of-freedom are studied, and 50 dynamic coefficients including the translational, tilting, and coupling components are completely calculated. The Reynolds equations and their perturbed equations are solved by the finite element method to obtain the dynamic stiffness and damping coefficients. The effects of the tilting motion on the dynamic coefficients and response are analyzed, respectively. The results show that the coupling coefficients between the translational and tilting motions, which have been neglected in most previous studies, are significant at large eccentricity ratio. But these coupling coefficients have little effect on the dynamic response. On the other hand, the influences of the tilting motion on the synchronous response and natural frequency are remarkable and will decrease the stability of the rotor bearing system.
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| contributor author | Yang, Guangwei | |
| contributor author | Du, Jianjun | |
| contributor author | Ge, Weiping | |
| contributor author | Liu, Tun | |
| contributor author | Yang, Xiaowei | |
| date accessioned | 2017-11-25T07:19:37Z | |
| date available | 2017-11-25T07:19:37Z | |
| date copyright | 2016/30/11 | |
| date issued | 2017 | |
| identifier issn | 0742-4787 | |
| identifier other | trib_139_03_031704.pdf | |
| identifier uri | http://138.201.223.254:8080/yetl1/handle/yetl/4235906 | |
| description abstract | The traditional eight-coefficient bearing model only considers the translational motion of the bearings and neglects the tilting motion and coupling effects between them. In this paper, the dynamic characteristics of the spiral-grooved opposed-hemisphere gas bearing considering five degrees-of-freedom are studied, and 50 dynamic coefficients including the translational, tilting, and coupling components are completely calculated. The Reynolds equations and their perturbed equations are solved by the finite element method to obtain the dynamic stiffness and damping coefficients. The effects of the tilting motion on the dynamic coefficients and response are analyzed, respectively. The results show that the coupling coefficients between the translational and tilting motions, which have been neglected in most previous studies, are significant at large eccentricity ratio. But these coupling coefficients have little effect on the dynamic response. On the other hand, the influences of the tilting motion on the synchronous response and natural frequency are remarkable and will decrease the stability of the rotor bearing system. | |
| publisher | The American Society of Mechanical Engineers (ASME) | |
| title | Dynamic Characteristics of Spiral-Grooved Opposed-Hemisphere Gas Bearings | |
| type | Journal Paper | |
| journal volume | 139 | |
| journal issue | 3 | |
| journal title | Journal of Tribology | |
| identifier doi | 10.1115/1.4034423 | |
| journal fristpage | 31704 | |
| journal lastpage | 031704-11 | |
| tree | Journal of Tribology:;2017:;volume( 139 ):;issue: 003 | |
| contenttype | Fulltext |