Browsing by Author "Vance, John M."
Now showing items 21-33 of 33
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Srinivasan, Anand (Texas A&M University, 2004-09-30)Internal friction has been known to be a cause of whirl instability in built-up rotors since the early 1900's. This internal damping tends to make the rotor whirl at shaft speeds greater than a critical speed, the whirl ...
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Gamal Eldin, Ahmed Mohamed (2009-05-15)This dissertation discusses research on the leakage and rotordynamic characteristics of pocket damper seals (PDS) and see-through labyrinth seals, presents and evaluates models for labyrinth seal and PDS leakage and PDS ...
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Yim, Kyung Bin (Texas A&M University. Libraries, 1984)By employing the extended Hamilton principle, both equations of motion and associated boundary conditions are derived for three different models subjected to non-conservative torques: the cantilevered rotor, the uniform ...
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Carter, Clint Ryan (2009-06-02)This thesis presents the static and dynamic performance data for a 5 pad tilting pad bearing in both the load-on-pad (LOP) and the load-between-pad (LBP) configurations over a variety of different loads and speeds. The ...
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Jafri, Syed M. (Texas A&M University, 2005-08-29)A two-mass model with a spring and a damper in the vertical direction, accounting for vertical translational motion and a torsional spring and a damper connecting the rotational motion of two masses is used to simulate the ...
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Vance, John M. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 1998-01-13)A damper seal (310) and method of sealing and damping a rotating shaft (312) are disclosed. The damper seal (310) includes a stator housing (314), a plurality of cavities (C1, C2, C3, C4), a first sealing blade (316) for ...
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Vance, John M.; Shultz, Richard R. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 1998-08-18)A damper seal and method of sealing and damping a rotating shaft are disclosed. The damper seal includes a stator housing, a plurality of cavities, a first modulator for modulating the fluid flow into the cavities, and a ...
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Shultz, Richard R.; Vance, John M. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 1996-07-30)A damper seal (10) and method of sealing and damping a rotating shaft (12) is provided with a stator housing (14) and at least two sealing blades, an upstream sealing blade (16) and a downstream sealing blade (18). There ...
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Ertas, Bugra Han (Texas A&M University, 2005-11-01)The present work describes experiments conducted on several pocket damper seal (PDS) designs using a high pressure annular gas seal test rig. Both rotating and non-rotating tests were conducted for a 12, 8, and 6 bladed ...
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Jafri, Syed Muhammad Mohsin (Texas A&M University, 2007-09-17)This dissertation presents an experimental and theoretical study of subsynchronous rotordynamic instability in rotors caused by interference and shrink fit interfaces. The experimental studies show the presence of strong ...
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Van Der Velde Alvarez, Daniel Eduardo (2009-05-15)This thesis presents the results for measured and predicted rotordynamic coefficients and leakage for a convergent-tapered honeycomb seal (CTHC). The test seals had a diameter of 114.968 mm (4.5263 in) at the entrance, and ...
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Wade, Jonathan Leigh (Texas A&M University, 2004-09-30)This thesis documents the results of high pressure testing of hole-pattern annular gas seals conducted at the Texas A&M University's Turbomachinery Laboratory. The testing conditions were aimed at determining the test seals ...
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Richards, Robert L.; Vance, John M.; Paquette, Donald J.; Zeidan, Fouad Y (Texas A&M University. Turbomachinery Laboratories, 1995)A new type of labyrinth seal that reduces cross coupled rotor forces and produces a remarkable amount of damping has been invented at Texas A&M University. Laboratory tests have shown complete elimination of critical speeds ...