... and footprint, turbine efficiency, and rotordynamics. Rotordynamic stability is assessed considering the high fluid density and related cross coupling effects. Finally, shaft end sizing, cooling system design, and the integration of dry gas seals are discussed. Fig. 6 Enthalpy-entropy diagram...

..., facing large pressure differentials along with significant changes in gas density, produce sizeable lateral forces that impact compressor stability and rotordynamic performance. There is extensive archival data on the dynamic forced performance of LS and textured surface seals. However, the experimental...

... Feb. 20, 2018, http://oaktrust.library.tamu.edu/handle/1969.1/93197 [2] Vance , J. M. , Zeidan , F. Y. , and Murphy , B. , 2010 , Machinery Vibration and Rotordynamics , John Wile & Sons , New York , pp. 216 – 238 . [3] San Andrés , L. , Diaz , S...

...-mail:  patrick.b.lamas@usp.br e-mail:  rnicolet@sc.usp.br 04 04 2022 29 08 2022 29 11 2022 rotordynamics vibration structural dynamics modal analysis Fig. 1 Test rig of the rotor with longitudinal periodicity: (1) shaft, (2) self-aligning ball bearings, (3) electric motor, (4...

...@ufu.br 24 04 2020 05 10 2020 31 03 2021 hydrodynamic bearings rotordynamics kriging surrogate models Francis hydropower unit Since the classical lubrication equation developed first by Reynolds [ 1 ], thermal variations, mechanical strain, and turbulence effects have...

... Fuel Cell Reactor and a Micro Gas Turbine ,” J. Power Sources , 96 ( 2 ), pp. 352 – 368 . 10.1016/S0378-7753(00)00668-6 [5] Childs , D. , 1993 , “ Additional Bearing Configurations ,” Turbomachinery Rotordynamics: Phenomena, Modeling, and Analysis , Wiley , New York , pp. 191...

... 12 2013 This paper focuses on extending an earlier investigation on the systematic and rational consideration of uncertainty in reduced order models of rotordynamics systems. The current effort concentrates on the consistent introduction of uncertainty in mass properties on the modal mass...

... by a diaphragm coupling. A total of four radial AFBs support the two rotors, and one set of double acting thrust foil bearing is located inside the gas generator turbine. The rotor configuration results in eight degree of freedom (DOF) rotordynamic motions, which are two cylindrical modes and two conical modes...

... Kligerman , Y. , Grushkevich , A. , and Darlow , M. S. , 1998 , “ Analytical and Experimental Evaluation of Instability in Rotordynamics System With Electromagnetic Eddy-Current Damper ,” ASME J. Vibr. Acoust. 0739-3717 , 120 , pp. 272 – 278 . 10.1115/1.2893817 Tonoli...

...Raghavendra Murthy; Marc P. Mignolet; Aly El-Shafei In the first part of this series, a comprehensive methodology was proposed for the consideration of uncertainty in rotordynamic systems. This second part focuses on the application of this approach to a simple, yet representative, symmetric rotor...

...Raghavendra Murthy; Marc P. Mignolet; Aly El-Shafei A systematic and rational approach is presented for the consideration of uncertainty in rotordynamics systems, i.e., in rotor mass and gyroscopic matrices, stiffness matrix, and bearing coefficients. The approach is based on the nonparametric...

... , respectively from the top down. The final observation of this series of testing is the rotordynamic behavior of the system as it changes with increased misalignment. The observations are preliminary but are noteworthy and deserving of further investigation. As the angle of misalignment increases...

... on a small rotor supported on flexure pivot hydrostatic pad gas bearings (FPTPBs) demonstrate stable rotordynamic responses up to 100,000 rpm (limit of the drive motor). Test rotor responses show the feed pressure raises the system critical speed (increase in bearing direct stiffness) while the viscous...