Squeeze film dampers supporting high-speed rotors: Rotordynamics

Hamzehlouia, Sina; Behdinan, Kamran

doi:10.1177/1350650120922082

Cited by 14 publications

(6 citation statements)

References 46 publications

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“…The vibration caused by an imbalance significantly influences the dynamic characteristics of a bearing-rotor system with a high DN value [8][9][10]. An oil film damper can attenuate the amplitude of vibration caused by residual imbalance and the external force of the casing.…”

Section: Introductionmentioning

confidence: 99%

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Li,

Cui,

Deng

2024

Lubricants

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(1) Background: To better understand the dynamic characteristics of a ball bearing with an elastic ring squeeze film damper (ERSFD) under sudden unbalance, a novel dynamic model was established by fully considering the coupling between the ERSFD, bearing outer ring (the journal), rotor, and disc (loading bearing); (2) Methods: An improved secant method was developed to determine the initial eccentricity values of the bearing’s outer ring and the disc. The dynamic response of the outer ring under different speed ratios, damping ratios, and mass ratios was solved using the variable-step Runge–Kutta method; (3) Results: In comparison, a low-speed ratio, high damping ratio, and low mass ratio were more conducive to suppressing the bearing vibration. When the imbalance was suddenly introduced, the displacement amplitude of the eccentricity, transmissibility, amplitude–frequency response, and the radius of the outer ring center locus increased; (4) Conclusions: This work provides a reference for further studying the nonlinear vibration of rolling bearings coupled with an ERSFD.

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Section: Introductionmentioning

confidence: 99%

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Li,

Cui,

Deng

2024

Lubricants

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“…For the purpose of safe operation, vibration suppression is becoming increasingly important [2] in the design of dual rotor systems, especially within the context of high speed and high thrust-to-weight ratios for modern aeroengines. Previously, squeeze film dampers have been widely applied for rotor vibration control, although unsuitable structural parameters could result in excessive nonlinear vibrations [3]. One possible solution to this problem is introducing active actuators into the rotor support structures, which makes it possible to change support's dynamic parameters in real time.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis of dual rotor system equipped with active friction dampers based on harmonic balance method and sensitivity analysis

Jiang,

Zhang,

Gao

et al. 2024

Preprint

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Numerical investigations are essential in appropriately determining normal forces for active dry friction dampers (ADFDs) within rotor systems, although existing methods suffer from the deficits of low-efficiency and over-simplifications. Within this paper, a harmonic-balance-based approach is proposed to efficiently obtain the responses of ADFDs-dual rotor system and a local sensitivity analysis is developed together with it to directly visualize the influences of ADFDs. The fixed-interface mode synthesis method and the trajectory tracing method are first utilized to reduce the system dimension. Then, a novel sampling strategy is proposed for the harmonic balance procedure to guarantee the orthogonality of Fourier basis. The resultant nonlinear equation is solved by the arclength continuation technique. To visually present the variation of rotor responses as the normal force of ADFD changes, a local sensitivity analysis method is developed together with the harmonic-balance-based solver. The frequency-domain sensitivity coefficients are derived analytically to facilitate computation of sensitivities. Numerical validations are carried to show the efficiency and accuracy of the developed method. The influences of ADFDs on rotor responses are discussed both numerically and experimentally. It is found that, due to the multiple excitations in dual rotor system, rotor whirl motions could exhibit the characteristics of multi-valued frequencies. The influences of ADFD on rotor responses are related to the rotational speeds, the ADFD normal forces and the ADFD installation positions. The developed method could intuitively show the influences of these factors on rotor vibration suppression, which provides an efficient tool for parameter optimization.

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“…Combining the aforementioned concepts, the integral squeeze film damper (ISFD) structure emerged in the early 1990s. This damper significantly improves the rotor system's vibration damping capacity while also making up for the traditional SFD's nonlinearity of oil film force [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

Yan,

Lu,

Pan

et al. 2024

Machines

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Integral squeeze film damper (ISFD) is a new type of structure that appeared on the basis of traditional squeeze film damper (SFD). Since the oil film in ISFD is a segmented structure without annular flow, the nonlinearity of the oil film force has been improved to a great extent. The dynamic characteristic coefficients of ISFD have a close relationship with its damping performance. This work investigates and studies the dynamic characteristic parameters of ISFD by means of numerical analysis and experimental validation techniques in order to examine the dynamic features and unveil the damping mechanism. The ISFD solid and fluid analysis models are created, and the computational fluid dynamics (CFD) and mechanical performance analyses are completed. The force acting on the ISFD’s S-type elastomer under excitation conditions is revealed in the mechanical property analysis, and the flow characteristics of the internal oil film are investigated in the CFD analysis. It is discovered that the ISFD has good linear damping and stiffness characteristics, and numerical analytical values for the ISFD’s damping and stiffness coefficients are obtained. By constructing a bi-directional excitation test rig, the experimental values of the ISFD stiffness coefficient and damping coefficient are determined. These values are in close agreement with the results of the numerical analysis, confirming the accuracy of the ISFD’s numerical analysis conclusions.

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Squeeze film dampers supporting high-speed rotors: Rotordynamics

Cited by 14 publications

References 46 publications

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Research on Sudden Unbalance Response of Rigid-Elastic-Oil Coupled Ball Bearings

Vibration analysis of dual rotor system equipped with active friction dampers based on harmonic balance method and sensitivity analysis

Research on Dynamic Characteristic Coefficients of Integral Squeeze Film Damper

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