Estimation of Rotordynamic Seal Coefficients Using Active Magnetic Bearing Excitation and Force Measurement

Wagner, Christian; Tsunoda, Wataru; Berninger, Tobias F. C.; Thümmel, Thomas; Rixen, Daniel J.

doi:10.1007/978-3-319-91217-2_1

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…where is the mass of the rotor, is the position stiffness, and is the current stiffness. It is noted that the influence of nonconservative forces such as the inner damping in the rotor or the cross-stiffness and cross-damping in fluid seals can be included as cross-coupling terms [17]. By discretizing ( 8), (9) with the sample time by the following matrix transformation, we obtain…”

Section: Modeling Of a 2-dof Amb Systemmentioning

confidence: 99%

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Adaptive MIMO pole placement control for commissioning of a rotor system with active magnetic bearings

et al. 2020

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Section: Modeling Of a 2-dof Amb Systemmentioning

confidence: 99%

“…where 1 and 2 are used to design the desired performance of the closed-loop controller, that is, the locations of the closed-loop poles. By considering the generalized canonical form ( 16), (17) the closed-loop system representation (36) can be expressed with the submatrices…”

Section: Pole Placementmentioning

confidence: 99%

Adaptive MIMO pole placement control for commissioning of a rotor system with active magnetic bearings

et al. 2020

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“…To reduce leaks between compressor stages, labyrinth seals are used, which are subject to high requirements for operational reliability [9]. At the same time, the use of non-contact gas-dynamic seals in a compressor design can lead to unstable, self-exciting behavior of a rotor [10]. Work [11] presents a case of increased rotor vibrations due to the occurrence of non-conservative gas-dynamic forces in labyrinth seals.…”

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confidence: 99%

Influence of Methane-Hydrogen Mixture Characteristics on Compressor Vibrations

Modorskii,

Cherepanov

2024

FDMP

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A transition to clean hydrogen energy will not be possible until the issues related to its production, transportation, storage, etc., are adequately resolved. Currently, however, it is possible to use methane-hydrogen mixtures. Natural gas can be transported using a pipeline system with the required pressure being maintained by gas compression stations. This method, however, is affected by some problems too. Compressors emergency stops can be induced by vibrations because in some cases, mechanical methods are not able to reduce the vibration amplitude. As an example, it is known that a gas-dynamic flow effect in labyrinth seals can lead to increased vibrations. This paper presents the numerical simulation of rotor oscillations taking into account a gas-dynamic load. The influence of a transported mixture on the oscillatory process is investigated. Mixtures consisting of methane and hydrogen in various proportions and an air mixture are considered. The results are discussed for various operating pressures and include the rotor motion trajectories and oscillation frequency spectra obtained numerically. It is shown that the gas mixture composition has a significant effect on the oscillations and their occurrence. Hydrogen as a working fluid reduces the vibration amplitude. Operating a compressor with hydrogen leads to a decrease in the resonant frequency, bringing it closer to the operating one. However, the operating pressure at which maximum oscillations are observed depends slightly on the gas mixture composition.

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Rotor frequency response self-identification using an active tilting-pad bearing

Silva,

Nicoletti

2024

J Braz. Soc. Mech. Sci. Eng.

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Estimation of Rotordynamic Seal Coefficients Using Active Magnetic Bearing Excitation and Force Measurement

Cited by 3 publications

References 7 publications

Adaptive MIMO pole placement control for commissioning of a rotor system with active magnetic bearings

Adaptive MIMO pole placement control for commissioning of a rotor system with active magnetic bearings

Influence of Methane-Hydrogen Mixture Characteristics on Compressor Vibrations

Rotor frequency response self-identification using an active tilting-pad bearing

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