Finite element analysis of high-speed grooved gas bearings /
A novel unite element procedure is devised to model grooved gas bearings and seals operating at high speeds. The procedure, founded on the Galerkin weighted residual method with a new class of high order shape functions, is employed to develop efficient computational models and to investigate the ef...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1999.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=730316871&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | A novel unite element procedure is devised to model grooved gas bearings and seals operating at high speeds. The procedure, founded on the Galerkin weighted residual method with a new class of high order shape functions, is employed to develop efficient computational models and to investigate the effects of high speeds on the steady-state and dynamic performance of gas lubricated spiral groove face seals (SGFSS), spiral groove thrust bearings (SGTBS) and herringbone groove journal bearings (HGJBS). The high order shape functions are derived from an approximate solution to the non-linear Reynolds equation within an element. The novel high order finite element procedure not only performs as efficiently as upwind finite element procedures widely used in diffusion-convection problems, but also does not require special schemes to evaluate the addiction flow terms in the Reynolds equation or introduces artificial diffusion into the solution. Efficiency and accuracy of the high order Galerkin procedure are successfully evaluated for one- and two-dimensional gas bearings. Seal opening force, leakage flow, power loss and dynamic force coefficients are predicted for coned-face and misaligned gas SGFSS operating at high speeds. The analysis shows that negative face coning and large misalignment angles can induce negative angular damping coefficients increasing the seal susceptibility to angular motions at high speeds. Also load capacity and dynamic force coefficients are predicted for gas HGJBs with a rotating smooth journal operating at high speeds. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xvii, 109 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 94-102). |