A Chambered Porous Damper for Rotor Vibration Control: Part I—Concept Development

Tecza, J.; Walton, James F.

doi:10.1115/1.2906717

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…The following comparative studies on the theoretical prediction of blade loss in the rotors of turbomachines were performed, and the experimental results were reported. Tecza and Walton (1993) and Walton and Martin (1993) carried out studies on imbalance vibration control by applying a squeeze film damper (SFD) to the nonlinearity of rotor movement caused by a sudden blade loss, and Zhang et al (1992) proposed the porous squeeze film damper (PSFD) for vibration control after a blade loss and conducted a comparative study on the vibration performances of an SFD and a PSFD using a Jeffcott rotor. Stallone et al (1983) used a mode composition method to predict the dynamic behavior caused by fan blade loss in an aero-engine and verified the effectiveness of the analytical method by comparing the results to experimental results.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of high-speed rotor supported by hybrid foil-magnetic bearing with sudden imbalance

Jeong

Lee

2015

Journal of Vibration and Control

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A hybrid foil-magnetic bearing (HFMB) was successfully studied as a vibration isolator by introducing a sudden imbalance or an unexpected disturbance during turbine/rotor operation. This HFMB is used to achieve stability during transient vibration behavior. The HFMB consists of two oil-free bearing technologies: an active magnetic bearing (AMB) and air foil bearing (AFB). Using both technologies takes advantage of the strengths of each bearing while compensating for their inherent weaknesses. In addition, the HFMB has good dynamic characteristics, and the damping can be adjusted using the appropriate gain selection for the AMB controller. Based on these unique features, dynamic stability can be enhanced, even if a sudden imbalance occurs while the rotor is operating. In this study, a rigid rotor was operated at up to 12,000 rpm and tested using a control algorithm to reduce the sudden imbalance vibration amplitudes. The experiment was conducted under the situation that the mass dropped out at 6,000 rpm. In order to validate the stability performance of the HFMB with a sudden mass loss, the vibration response results for the AFB and HFMB were compared. When applying the HFMB, the asynchronous vibration was suppressed, and the 1x vibration results showed reductions of almost 30%. When the sudden mass loss occurred, the magnetic control force was remarkably effective at reducing the asynchronous vibration of the rotor supported by the HFMB. In conclusion, it was experimentally verified that using the HFMB made sudden imbalance vibration control possible during rotor operation with an air foil bearing. In this respect, the HFMB has the characteristics of high stiffness/damping, which prevent rubbing and suppress excessive vibration due to a sudden imbalance event.

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Section: Introductionmentioning

confidence: 99%

Vibration control of high-speed rotor supported by hybrid foil-magnetic bearing with sudden imbalance

Jeong

Lee

2015

Journal of Vibration and Control

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“…A proper choice of the total clearance and the number of foil sleeves will reduce the nonlinearities associated with high eccentricity ratio operation. Tecza and Walton (1993) proposed a porous damper design. With porous elements between discrete chambers to absorb energy, linear damper behaviour over a wide vibration amplitude range is retained.…”

Section: Introductionmentioning

confidence: 99%

An Improved Squeeze Film Damper for Rotor Vibration Control: Theoretical Results

Zhao

Linnett

Hahn

1994

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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This paper proposes an improved squeeze film damper which will prevent the bistable operation associated with conventional squeeze film dampers at large unbalances and/or at small bearing parameters. It consists of a conventional squeeze film damper with a flexibly supported outer ring. This secondary flexible support is considered to be massless, and to have a constant stiffness and damping. The effectiveness of this damper in preventing bistable operation is investigated over a wide range of operating conditions for a rigid rotor supported on a centrally preloaded squeeze film damper. It is shown that depending on relevant parameters such as the stiffness ratio between the secondary support and the retaining spring, the damping coefficient of the support, and the mass ratio between the damper outer ring and the rotor, this proposed damper is very effective in preventing bistable operation even for high unbalance conditions.

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Long duration blade loss simulations including thermal growths for dual-rotor gas turbine engine

Sun

Palazzolo

Provenza

et al. 2008

Journal of Sound and Vibration

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A Chambered Porous Damper for Rotor Vibration Control: Part I—Concept Development

Cited by 4 publications

References 5 publications

Vibration control of high-speed rotor supported by hybrid foil-magnetic bearing with sudden imbalance

Vibration control of high-speed rotor supported by hybrid foil-magnetic bearing with sudden imbalance

An Improved Squeeze Film Damper for Rotor Vibration Control: Theoretical Results

Long duration blade loss simulations including thermal growths for dual-rotor gas turbine engine

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