Browsing by Subject "rotordynamics"
Now showing items 1-15 of 15
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(2022-07-25)This project presents the design of a compliantly damped tilting pad porous carbon hybrid gas bearing (CHGB), and a test rig to facilitate component and system level testing. The intent of such a bearing is to operate as ...
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(2015-05-13)In this dissertation, the influence of using induction motor in machinery train on rotordynamics is discussed. Two areas are considered – the use of variable frequency drives (VFDs), which control and drive the induction ...
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(Texas A&M University, 2005-02-17)Results are presented for experimental and theoretical rotordynamic coefficients and leakage of straight smooth annular gas seals. Experimental rotordynamic coefficients were measured and trends in changes of rotordynamic ...
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(2014-08-06)The present study is focused on accurate prediction of Morton effect problem including journal asymmetric heating and the corresponding long period amplitude oscillations using a nonlinear time transient rotordynamic ...
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(2016-12-02)Electric Submersible Pumps (ESPs) are a subgroup of pumps designed to have small diameters to accommodate tight working environments. The long length of an ESP (5-100 stages) requires a large amount of annular seals. Each ...
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(2009-06-02)Methods are presented for parameter identification of an annular gas seal on a flexiblerotor test rig. Dynamic loads are applied by magnetic bearings (MBs) that support the rotor. MB forces are measured using fiber-optic ...
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(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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(2016-05-18)Circumferential grooves are machined into the rotor surface of liquid annular seals to reduce leakage. Analyses in the literature regarding rotordynamic coefficients for smooth stator/grooved rotor (SS/GR) seals are scarce, ...
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Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing (2012-02-14)Many researchers have compared predicted stiffness and damping coefficients for tilting-pad journal bearings (TPJBs) to measurements. Most have found that direct damping is consistently overpredicted. The thrust of this ...
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(2014-11-26)This thesis presents measurements characterizing the static and dynamic performance of a BFB configured with shims of two thicknesses (30 μm and 50 μm). Parameters of interest include drag torque, rotor lift off speed, and ...
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(Texas A&M University, 2007-04-25)A rotordynamic analysis of hole-pattern gas annular seals using a two-control-volume model, Ha and Childs and frequency dependent transfer-function model, Kleynhans and Childs is modified with four features. The energy ...
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(Texas A&M University, 2004-11-15)Rotor-dynamic stability is a very important subject impacting the design, control, maintenance, and operating safety and reliability of rotary mechanical systems. As rotor-dynamic nonlinearities are significantly more ...
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(Texas A&M University, 2004-09-30)A new closed-loop frequency-domain model is developed to incorporate the water hammer effect with pump rotordynamics, in order to investigate the sub-synchronous instability problem observed in a field pump. Seal flow-rate ...
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(2016-12-09)Original Equipment Manufacturers (OEMs) increase pump efficiency by reducing process fluid leakage from high-pressure stages into low-pressure ones. Smooth, liquid annular seals are used between pump stages to achieve this ...
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(Texas A&M University, 2004-09-30)Torsional vibration is an oscillatory angular twisting motion in the rotating members of a system. It can be deemed quite dangerous in that it cannot be detected as easily as other forms of vibration, and hence, subsequent ...