Misalignment In A Complete Shell Gas Foil Journal Bearing

Carpino, Marc; Peng, Jiayu; Medvetz, Lynn

doi:10.1080/10402009408983365

Cited by 36 publications

(16 citation statements)

References 3 publications

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“…A model that does not include membrane effects will underpredict the maximum load because of contact between the top foil and the journal. Similar effects of membrane strains were discussed by Carpino, et al (22), (23).…”

Section: Resultssupporting

confidence: 53%

Thermal Structural Effects in a Gas-Lubricated Foil Journal Bearing

Talmage

Carpino

2011

Tribology Transactions

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A theoretical model for gas-lubricated foil journal bearings that incorporates thermal structural effects is presented. Bending and membrane effects in the top foil resulting from temperature are included along with thermal expansion of the journal, subfoil, and bearing housing. The model includes thermal transport through the journal, foils, and bearing housing. Pressure in the gas film is predicted using the Reynolds equation, and a thermal bulk flow model is used to predict temperature. The results demonstrate that models will overpredict film thickness along the side edge of a bearing if thermal strain in the top foil is not included. In addition, the results show the need for a three-dimensional thermal flow model at the trailing edge of a bearing when backflow occurs.

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Section: Resultssupporting

confidence: 53%

Thermal Structural Effects in a Gas-Lubricated Foil Journal Bearing

Talmage

Carpino

2011

Tribology Transactions

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“…[5]- [8] into Eq. [2], neglecting the higherorder terms, it yields the zeroth-order and first-order equations. These equations for perturbation in film thickness due to journal displacement can be expressed in the following non-dimensional form:…”

Section: Perturbationmentioning

confidence: 99%

The Influence of the Slip Flow on Steady-State Load Capacity, Stiffness and Damping Coefficients of Elastically Supported Gas Foil Bearings

Lee

Choi

Lee

et al. 2002

Tribology Transactions

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Tlte .sli/)flon~ effect is considered to estiniate the load capacity tion with slipflow conditions is used to evaluate the load capaci~n c l tlte clyrtuntic coefficient.^ of an elastically-supported gas foil ty. The linearized dynamic coefficient equations are obtained by hearing when the locrrl Kt~udsen nrtntbcr for the mininlun~ film the perturbation method. Nunzericul predictions compare the storthickrre.ss is greater that1 0.01. The contl~ressible Reynolds equaic and dynamic force perforniances considering slip flow at roomto-high temperate with the performance of elastically-supported Presented a s a Soclety of Trlbologlsts and Lubrlcatlon Engineers foil bearing withor4t slipflow for a range of bearing compliances ature is significant in the region of low bearing numbers.= accommodation coefficient = damping coefficients; ni, 11 = s or y = rndinl clearance = foil structural compliance; cf = IIKf = r:lrel:iction coefficient = bearing diameter = ecce~itricity = film thickness; = / L / C = nominal film thickness = perturbi~tion component of h; nl = x, y, x or y = resultant forces in s and y direction = foil structur;~l stiffness per unit area = stiffness coefficients; nl,n = x or y = Knudsen number = nominal Knudsen number = benring length = pressure; fi = pip,, = i~~iibient pressure = perturbation component of p; nt = x, y, x or Ij = bearing radius = time variable = velocity of journal surface = load capacity = foil deflection = axial coordinate = nondimensional compliance; a = P,/cK, = normalized difference in damping coefficient, AC = (C, -Cs)IC, = normalized difference in stiffness coefficient, AK = (K,, -Ks)IK,, = normalized difference in load capacity, AW = CW, -Ws)IWns =journal position perturbations =journal velocity perturbations = eccentricity ratio = attitude angle = whirl frequency ratio = rarefaction coefficient = molecular mean free path = circumferential coordinate = bearing number; A = (6p W /~, ) ( R / C )~, = A; = fluid viscosity =journal angular velocity = unit vector in the Bdirection 0 = steady state x = perturbation x component Y = perturbation y component x = perturbation x component Y = perturbation jc component Downloaded by [University of Texas Libraries] at 02:

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“…Very little work has been reported on GFB misalignment. Carpino (1994) analyzed misalignment effects and found that load capacity is not affected strongly, but minimum film thickness decreases with increased misalignment. However, those results were for very small angular misalignments (maximum angle equal to C/L radians) relative to those in the present tests (maximum angle of 10.4 C/L radians).…”

Section: Misalignmentmentioning

confidence: 99%