A pad perturbation method for the dynamic coefficients of tilting-pad journal bearings

Allaire, Paul E.; Parsell, J. K.; Barrett, Lloyd

doi:10.1016/0043-1648(81)90281-7

Cited by 69 publications

(43 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The bearing equivalent stiffness coefficients are calculated by a simplification of the proposed perturbation method [18]. The adopted operational conditions in study are listed in Table III.…”

Section: Numerical Resultsmentioning

confidence: 99%

Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

Silveira¹,

Nicoletti²,

Fortulan³

et al. 2010

Cerâmica

View full text Add to dashboard Cite

This paper presents the development of an advanced ceramic material for manufacturing aerostatic porous bearing. The results show that there is homogeneous distribution of the pores in the alumina matrix by using different concentrations of the added component (sucrose). The average pore diameter remained around 0.14 µm and respective porosity around 28%, with small standard deviation. The mathematical model of the aerostatic porous bearing is presented, and numerical results indicate that the parameter related to porous medium (G) strongly affects the resultant bearing load capacity and stiffness. Considering the experimental and numerical results, the porous matrix obtained with 40% of sucrose concentration is more suitable for the aerostatic porous bearing application in study. Keywords: porous ceramic materials, aerostatic bearings, permeability identification, bearing modeling. Resumo Este trabalho apresenta o desenvolvimento de materiais cerâmicos porosos, obtidos a partir de cerâmicas estruturais (alumina), para a fabricação de mancais aerostáticos. Os resultados iniciais indicaram que, houve homogeneidade na distribuição dos poros na matriz de alumina, obtida com diferentes concentrações de agente poroso (sacarose). O valor médio dos poros foi de

show abstract

Section: Numerical Resultsmentioning

confidence: 99%

Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

Silveira¹,

Nicoletti²,

Fortulan³

et al. 2010

Cerâmica

View full text Add to dashboard Cite

show abstract

“…Later, Nicholas et al [3] modified the pad assembly method and used finite element method to solve the hydrodynamic pressure field. Allaire P E [4] show the complete dynamical matrices for a five pad tilting pad bearing both including the damping effects of the unloaded pads. Chen [5] presented a pad assembly method to calculate reduced dynamic stiffness and damping coefficients for flexure pivot pad journal bearings, including the effects of the flexibility of the pivot and the inertia of the pad.…”

Section: Introductionmentioning

confidence: 99%

Dynamics modeling and analysis for tilting-pad fluid film bearing considering perturbation frequency

Yang

Luo

et al. 2015

2015 International Conference on Fluid Power and Mechatronics (FPM)

View full text Add to dashboard Cite

Swing of pads on the tilting pad bearing increases the DOF of the system. Pads and journal perturbation frequency has a great influence on calculating the tilting pad bearing dynamic coefficients. The currently research, the effect of the shaft and pads perturbation frequency generally were not considered on dynamic coefficients of tilting pad bearings. Frequency reduced dynamical model of the tilting pad bearings was presented considering the effects of the perturbation frequency, and frequency reduced oil film dynamic coefficients matrix was investigated in detail. The FEM method was used to solve oil film dynamic coefficients with considering perturbation frequency for the tilting pad bearing. The numerical results indicate that the direct stiffness coefficients reduce, while the direct damping coefficients enhance, and the cross coupling stiffness and damping coefficients change little with increasing perturbation frequency.

show abstract

“…The dynamic modeling of journal bearings, specifically the TPJBs, by linear dynamic coefficients is a common approach to linear dynamic analysis of rotor-bearings systems, and researchers have proposed several procedures for evaluating such coefficients over past decades [1][2][3][4][5][6][7][8]. However, linear coefficients may not be used in an accurate prediction of unbalance response while rotating parts experiences large amplitude vibration due to high dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

“…(6), respectively. For a specified state of TPJB's DOFs and an initial guess for the oil film bulk temperature rise, the temperature distributions within the pads and the oil film can be evaluated and updated iteratively, through the Eqs (3)(4)(5)(6)(7)(8)(9)…”

mentioning

confidence: 99%

Nonlinear model identification of oil-lubricated tilting pad bearings

Asgharifard-Sharabiani

Ahmadian

2015

Tribology International

View full text Add to dashboard Cite

A pad perturbation method for the dynamic coefficients of tilting-pad journal bearings

Cited by 69 publications

References 11 publications

Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

Ceramic matrices applied to aerostatic porous journal bearings: material characterization and bearing modeling

Dynamics modeling and analysis for tilting-pad fluid film bearing considering perturbation frequency

Nonlinear model identification of oil-lubricated tilting pad bearings

Contact Info

Product

Resources

About