Elastomer O-Rings as Centering Spring in Squeeze Film Dampers: Application to Turbochargers

Dousti, Saeid; Kaplan, Jason A.; Feng, He; Allaire, Paul E.

doi:10.1115/gt2013-94923

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…The O-ring under test (1) is compressed between bushing (2), connected to the stinger of shaker (7), and shaft (3), fixed to support (5). The load cell (4) is placed between support (5) and the fixed frame (6). By means of the shaker a sinusoidal displacement is imposed to the bushing.…”

Section: Methodsmentioning

confidence: 99%

“…O-rings were used in gas bearings to improve the static stiffness [2], but in most cases their main function is to overcome the whirl instability in journal bearings [3,4] or the pneumatic hammer [5]. In [6,7] an analytical model is developed to predict the restoring and hysteresis characteristics of elastomer O-rings mounted in squeeze film dampers. Stiffness and damping coefficients of the elastic supports which ensure the stability of the rotor are theoretically studied in [8], where it is shown that it is possible to avoid the half-speed whirl.…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper O-rings composed of high temperature resistant rubber are tested with a test rig for the purpose developed in University of Leuven. The aim is 2 Advances in Tribology (6) (4)…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Al‐Bender

Colombo

Reynaerts

et al. 2017

Advances in Tribology

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This paper concerns the dynamic characterization of rubber O-rings used to introduce damping in high speed gas bearing systems. O-shaped rubber rings composed of high temperature rubber compounds are characterized in terms of stiffness and damping coefficients in the frequency range 100-800 Hz. Simple formulas with frequency independent coefficients were identified to express the viscoelastic properties of the O-rings. The formulas proposed approximate the stiffness and damping coefficients of O-rings of general size.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Al‐Bender

Colombo

Reynaerts

et al. 2017

Advances in Tribology

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“…Its dynamic properties are necessary for mechanical designers, so various types of O-ring were tested, and the measured stiffness and damping coefficients were modeled as functions of temperature, frequency, squeeze, and so on. 10–13 Shoyama 14 clarified that the essential shape-independent parameter to derive the mechanical properties of the O-ring is the shear complex modulus of the rubber material, which can be obtained as a function of the deformation frequency and hydrostatic pressure by a previously proposed method. 15…”

Section: Introductionmentioning

confidence: 99%

Emergence of tangential stiffness through the use of inclined orthotropic material

Shoyama

Wada

Matsushita

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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A flexible bearing support structure is effective for stabilizing the self-excited vibration of a bearing, such as oil whirl. The stabilization effect is increased if the structure has static tangential stiffness, where the reaction force is perpendicular to the displacement. In this study, it is shown that a support component made of inclined orthotropic material, which exhibits shear–extension coupling, can have tangential stiffness.　The circumferential average of the tangential stiffness was found to vanish with a rotationally symmetric configuration of these components because the tangential forces of each component cancel out. However, the tangential force was recovered by allowing separation on the contact surface. A circular formation of an inclined orthotropic sheet that shows an axisymmetric stiffness matrix is proposed. Theoretical and numerical analyses clarified the effects of the friction coefficient, fitting interference, and degree of anisotropy of the material. Zero interference was found to be the best condition to maximize tangential stiffness.

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“…Dult [22] presented the development of preliminary equations by using differential operator algebra to analyze the motion of a simple viscoelastic rotor-shaft-system. Dousti et al [23] addressed the nonlinear dynamic behavior of O-ring seals as the centering spring in the squeeze film dampers, and the model was incorporated in a linear and time transient rotor dynamic analyzer of a vertical turbocharger. Waumans et al [24] used elastomeric O-rings in combination with a tunable squeeze film damper as the elastomer suspension in the experimental test to solve the dynamic stability problem of high-speed air bearings.…”

mentioning

confidence: 99%

Nonlinear Dynamic Analysis of a Rotor-Porous Air Journal Bearing System With O-Rings Mounted

Zhang

Feng

et al. 2021

Preprint

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Porous air journal bearings (PAJBs) with O-rings mounted are regarded as a potential choice to offer air levitation with a large load capacity and optimal start/stop characteristics, which are required in small-size and high-efficiency turbomachinery. However, the coupling of the mechanical properties of the O-rings and lubrication induce strong nonlinear characteristics, thereby affecting the dynamic responses of the rotor. In this study, a numerical model is presented, which is coupled with the excitation frequency-influenced stiffness and damping characteristics of O-rings, the Darcy’s laws, air motion equations established by the air lubrication model, and the rotor and bearing motion equations. The model is well verified by the experimental results. The effect of the different system parameters on the performance of the rotor-PAJB system (RPS) is studied by analyzing the bifurcation diagrams, orbit, Poincaré maps, and FFT plots. Results show that the motion of the rotor is changed between periodic and quasi-periodic with the variation in rotational speed, external supply pressure, bearing clearance, and porous permeability. With O-rings mounted, the stability of RPS can be increased to hinder the rotor motion from changing from periodic to quasi-periodic. The effectiveness in increasing the stability of the RPS for the O-rings with SBR as the material is better than that with NBR but weaker than that with VMQ. Moreover, only a few number of O-rings have better effects on improving the stability of the RPS.

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Elastomer O-Rings as Centering Spring in Squeeze Film Dampers: Application to Turbochargers

Cited by 5 publications

References 4 publications

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Emergence of tangential stiffness through the use of inclined orthotropic material

Nonlinear Dynamic Analysis of a Rotor-Porous Air Journal Bearing System With O-Rings Mounted

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