..., 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...

... of magnitude faster to execute; however, it relies on an assumed (largely unknown) reference GVF. dampers rotordynamics force coefficients A broad range of operation speeds, including a passage through critical speeds, and the implementation of tighter clearances in secondary flow passages can...

...-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 Conselho Nacional de Desenvolvimento Científico e Tecnológico 10.13039/501100003593 304212/2021-0 Coordenação de...

... rotordynamics kriging surrogate models Francis hydropower unit Figure 3 shows the main geometrical parameters of a TPJ bearing, in which R is the shaft radius, R P is the pad radius, h P is the pad thickness, O S ( x R , y R ), O P , and O P' are the shaft center, the pad center...

... https://youtu.be/7KcRS04FZY4?t=117 7 https://www.youtube.com/watch?v=zXHlw92tzqM 8 https://youtu.be/7KcRS04FZY4 e-mail:  lsanandres@tamu.edu e-mail:  bryanrgz@tamu.edu 26 08 2020 19 09 2020 20 10 2020 Gas bearings rotordynamics shock test...

... definiteness of J ¯ ¯   G and, in turn (using Eq. (49) ), of I ¯ ¯   G as necessary. Note that the preceding procedure is general; neither specific to the present effort nor to rotordynamic systems. for arbitrary scalars a i , i = 1,2...

... 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...

... rotordynamics aero-engines The control of rotor vibration is essential in aero-engine design. In addition to the safety requirement of avoiding rotor bend critical speeds within the engine running range, the response of the many other modes of the rotors and engine structure system must be controlled...

...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...

... coefficients may be affected by misalignment. The rotordynamic simulator test rig at NASA Glenn Research Center (Fig. 2 ) ( 10 ) was used to conduct misalignment tests on two journal GFBs. The specific geometry of the individual bumps is proprietary and the reader is referred to the patent for more details...

... 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...