Browsing by Subject "Rotordynamics"
Now showing items 1-20 of 32
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(2020-10-29)Conventional rotordynamic analyses generally simplify the rotor, neglecting detailed geometrical characteristics. However, in modern rotating machines, rotors consist of multiple complex-shaped parts that are usually ...
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(2020-05-14)In the subsea oil and gas industry, multiphase pumps and wet gas compressors are preferred technologies as they eliminate a conventional liquid-gas separation station to save up to 30% of capital investment. Seals in ...
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(2020-11-10)The Mixing Coefficient (MC) is an uncertain, assumed parameter for predicting the leading-edge temperature of a pad film domain. The conventional approach, employing an assumed MC has shown limitations for accurately ...
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(2015-12-09)Gas turbine engine manufacturers push for increasingly simpler squeeze film damper (SFD) designs that can still provide necessary damping to suppress rotor vibrations and offer stability to rotor-bearing systems. The work ...
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(2009-05-15)Comprehensive modeling of gas foil bearings (GFBs) anchored to reliable test data will enable the widespread usage of GFBs into novel turbomachinery applications, such as light weight business aircraft engines, hybrid fuel ...
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(2011-10-21)Misalignment in turbomachinery has been commonly known to produce twotimes- running-speed (2N) response. This project aimed to investigate the source of the 2N vibration response seen in misaligned vibrating machinery ...
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(2017-12-04)Data are available for a previously tested annular seal with no swirl brakes (NSB). The NSB seal design was modified by adding slots at the inlet to produce a swirl brake (SB) seal. Tests were conducted to evaluate the ...
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Bulk-Flow analysis for force and moment coefficients of a shrouded centrifugal compressor impeller (Texas A&M University, 2005-08-29)An analysis is developed for a compressible bulk-flow model of the leakage path between a centrifugal compressor's impeller shroud and housing along the front and back side of the impeller. This is an extension of analysis ...
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(2016-10-10)Fluid forces acting on the shrouded centrifugal pump/compressor impellers are evaluated using the computational fluid dynamics (CFD) approach. A face-seal impeller is selected to study for predicting the rotordynamic ...
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(2018-10-22)Eccentrically operating turbomachinery components such as impellers and seals are subject to flow induced forces known as rotordynamic forces. Rotordynamic forces can be detrimental to the machine stability and longevity. ...
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(2022-12-13)The rotordynamic characteristics and leakage are presented for three damper seals manufactured by 3D printing with carbon fiber reinforced Nylon. The seals have texture patterns consisting of diamond shaped holes. The first ...
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(2019-07-09)Balance piston gas seals restrict leakage at the discharge of centrifugal compressors. There are multiple types including labyrinth seals, textured seals, pocket damper seals (conventional PDS), and fully-partitioned pocket ...
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(2012-10-29)Electrical Signature Analysis (ESA) has been introduced for some time to investigate the electrical anomalies of electric machines, especially for induction motors. More recently hints of using such an approach to analyze ...
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(2019-11-22)Squeeze film dampers (SFDs) in high-performance turbomachinery reduce rotor motion amplitudes as it traverses a critical speed or when the system has a dynamic instability, thus ensuring system reliability. To improve the ...
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(Texas A&M University, 2005-11-01)Rotor-bearing system characteristics, such as natural frequencies, mode shapes, stiffness and damping coefficients, are essential to diagnose and correct vibration problems during system operation. Of the above characteristics, ...
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(2010-07-14)Rotordynamic coefficients of a gas labyrinth seal are assumed to be frequency independent. However, this assumption loses its validity as rotor surface velocity approaches Mach 1. The solution procedure of 1CV model by ...
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(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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(2015-12-01)Rotordynamic and leakage data are presented for a see-through tooth-on-rotor (TOR) labyrinth seal with comparisons to a see-through tooth-on-stator (TOS) labyrinth seal. Measurements for both seals are also compared to ...
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(2022-05-26)Modern SFD designs are short in axial length to limit weight and part count and supplied with a low lubricant feed pressure to reduce operating costs related to lubricant storage and pumping power. O-rings (ORs) reduce ...
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(2017-10-09)Annular-labyrinth seals restrict leakage in turbomachinery but may provide unwanted destabilizing forces. This work provides measurements of an interlockinglabyrinth gas seal to further the understanding of leakage ...