Dynamic Characteristics of a Hard Disk Drive Spindle System Due to Imperfect Shaft Roundness
This paper proposes a modified Reynolds equation for the coupled journal and thrust fluid dynamic bearings (FDBs) to include variable film thickness due to imperfect roundness of a rotating shaft. A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reac...
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| Veröffentlicht in: | IEEE transactions on magnetics 2009-11, Vol.45 (11), p.5148-5151 |
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| container_title | IEEE transactions on magnetics |
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| creator | Koak, K.Y. Kim, H.W. Jung, K.M. Jang, G.H. |
| description | This paper proposes a modified Reynolds equation for the coupled journal and thrust fluid dynamic bearings (FDBs) to include variable film thickness due to imperfect roundness of a rotating shaft. A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reaction force, moment, and friction torque of FDBs are calculated by integrating the pressure and shear stress along the fluid film. The dynamic behavior of a hard disk drive (HDD) spindle system is investigated by solving the equations of motion with six degrees of freedom using the Runge-Kutta method. This research shows that the imperfect roundness of the shaft increases the nonlinearity of FDBs. Imperfect roundness of the shaft generates harmonics of the groove number plusmn 1 in the bearing reaction force and the displacement of the HDD spindle system even in the case of stationary grooved FDBs. |
| doi_str_mv | 10.1109/TMAG.2009.2029642 |
| format | Article |
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A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reaction force, moment, and friction torque of FDBs are calculated by integrating the pressure and shear stress along the fluid film. The dynamic behavior of a hard disk drive (HDD) spindle system is investigated by solving the equations of motion with six degrees of freedom using the Runge-Kutta method. This research shows that the imperfect roundness of the shaft increases the nonlinearity of FDBs. Imperfect roundness of the shaft generates harmonics of the groove number plusmn 1 in the bearing reaction force and the displacement of the HDD spindle system even in the case of stationary grooved FDBs.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2009.2029642</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Bearings ; Cross-disciplinary physics: materials science; rheology ; Dynamic behavior ; Dynamical systems ; Exact sciences and technology ; Finite element methods ; fluid dynamic bearings (FDBs) ; Fluid dynamics ; Friction ; groove ; Hard disks ; Magnetism ; Manufacturing ; Materials science ; Mathematical analysis ; Nonlinear dynamical systems ; Nonlinear dynamics ; Nonlinear equations ; Other topics in materials science ; Physics ; Reynolds equation ; Roundness ; Shafts ; Shape ; Spindles ; Stress ; Torque</subject><ispartof>IEEE transactions on magnetics, 2009-11, Vol.45 (11), p.5148-5151</ispartof><rights>2015 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reaction force, moment, and friction torque of FDBs are calculated by integrating the pressure and shear stress along the fluid film. The dynamic behavior of a hard disk drive (HDD) spindle system is investigated by solving the equations of motion with six degrees of freedom using the Runge-Kutta method. This research shows that the imperfect roundness of the shaft increases the nonlinearity of FDBs. Imperfect roundness of the shaft generates harmonics of the groove number plusmn 1 in the bearing reaction force and the displacement of the HDD spindle system even in the case of stationary grooved FDBs.</description><subject>Bearings</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Dynamic behavior</subject><subject>Dynamical systems</subject><subject>Exact sciences and technology</subject><subject>Finite element methods</subject><subject>fluid dynamic bearings (FDBs)</subject><subject>Fluid dynamics</subject><subject>Friction</subject><subject>groove</subject><subject>Hard disks</subject><subject>Magnetism</subject><subject>Manufacturing</subject><subject>Materials science</subject><subject>Mathematical analysis</subject><subject>Nonlinear dynamical systems</subject><subject>Nonlinear dynamics</subject><subject>Nonlinear equations</subject><subject>Other topics in materials science</subject><subject>Physics</subject><subject>Reynolds equation</subject><subject>Roundness</subject><subject>Shafts</subject><subject>Shape</subject><subject>Spindles</subject><subject>Stress</subject><subject>Torque</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpdkE1LAzEQhoMoWKs_QLwEQTytJtkkuzlKV6ugCH7chBCzE5q6HzXZFfrvTWnx4GWGmXnel-FF6JSSK0qJun57uplfMUJUKkxJzvbQhCpOM0Kk2kcTQmiZKS75ITqKcZlGLiiZoI9q3ZnWWzxbmGDsAMHHwduIe4cNvjehxpWPX7gK_gfw68p3dZP6Og7Q4moEPPT4oV1BcGAH_LowbsAv_djVHcR4jA6caSKc7PoUvd_dvs3us8fn-cPs5jGzueBDBqJ0ljIlXGmZzF0NLCfEEFGzT0GEU6KslZMgwBjOC_eZttRyUI7kTFqVT9Hl1ncV-u8R4qBbHy00jemgH6MupSqFKoRI5Pk_ctmPoUvP6VJIxShnRYLoFrKhjzGA06vgWxPWmhK9SVtv0tabtPUu7aS52BmbaE3jgumsj39CxqgocskTd7blPAD8nQVL3-Uq_wWc2YdF</recordid><startdate>20091101</startdate><enddate>20091101</enddate><creator>Koak, K.Y.</creator><creator>Kim, H.W.</creator><creator>Jung, K.M.</creator><creator>Jang, G.H.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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A finite element method is used to solve the modified Reynolds equation to calculate the pressure. Reaction force, moment, and friction torque of FDBs are calculated by integrating the pressure and shear stress along the fluid film. The dynamic behavior of a hard disk drive (HDD) spindle system is investigated by solving the equations of motion with six degrees of freedom using the Runge-Kutta method. This research shows that the imperfect roundness of the shaft increases the nonlinearity of FDBs. Imperfect roundness of the shaft generates harmonics of the groove number plusmn 1 in the bearing reaction force and the displacement of the HDD spindle system even in the case of stationary grooved FDBs.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TMAG.2009.2029642</doi><tpages>4</tpages></addata></record> |
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| subjects | Bearings Cross-disciplinary physics: materials science rheology Dynamic behavior Dynamical systems Exact sciences and technology Finite element methods fluid dynamic bearings (FDBs) Fluid dynamics Friction groove Hard disks Magnetism Manufacturing Materials science Mathematical analysis Nonlinear dynamical systems Nonlinear dynamics Nonlinear equations Other topics in materials science Physics Reynolds equation Roundness Shafts Shape Spindles Stress Torque |
| title | Dynamic Characteristics of a Hard Disk Drive Spindle System Due to Imperfect Shaft Roundness |
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