Surface Roughness and Structural Inertia in a Mode-Based Mass-Conserving Elastohydrodynamic Lubrication Model

Boedo, S.; Booker, J. F.

doi:10.1115/1.2833518

Cited by 48 publications

(12 citation statements)

References 16 publications

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“…where, provided [M * ] is non-singular, 8represents the system complex eigenvalues. These eigenvalues are composed of a real part "a" and an imaginary part "b", given by Equation (11). s a ib = ±…”

Section: Eigenvalue Problemmentioning

confidence: 99%

Finite Element Method Applied to the Eigenvalue Analysis of Flexible Rotors Supported by Journal Bearings

Miranda¹,

Faria²

2014

ENG

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This work deals with a finite element procedure developed to perform the eigenvalue analysis of damped gyroscopic systems, represented by flexible rotors supported on fluid film journal bearings. The rotor finite element model is based on the Timoshenko beam theory, accounting for the shaft rotary inertia and gyroscopic moments. The governing equations for the hydrodynamic journal bearing are obtained through the Galerkin weighted residual method applied to the classical Reynolds equation. A perturbation scheme on the fluid film governing equation permits to obtain the zero-th and first order lubrication equations for the bearings, which allow the computation of the dynamic force coefficients associated with the bearing stiffness and damping. The rotor-bearing system equation, which consists of a case of damped gyroscopic equation, is rewritten on state form to compute the complex eigenvalues. The natural frequencies at several operating conditions are obtained and compared to the technical literature data. The influence of the effective damping on the eigenvalue real part sign is analyzed for some examples of rotor-bearing systems, showing how the stability conditions can be predicted by the eigenvalue analysis. The procedure implemented in this work can provide useful guidelines and technical data about the selection of the more appropriate set of bearing parameters for rotating machines operating at stringent conditions.

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Section: Eigenvalue Problemmentioning

confidence: 99%

Finite Element Method Applied to the Eigenvalue Analysis of Flexible Rotors Supported by Journal Bearings

Miranda¹,

Faria²

2014

ENG

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“…Distortion of the con-rod bearing that was caused by con-rod inertia forces and by oil ®lm hydrodynamic pressure force was considered by Boedo and Booker [33]. They used ®nite elements to model the connecting rod and the lubricant ®lm, and allowed for distributed con-rod mass and for conservation of mass in determination of the cavitation region in the bearing.…”

Section: Theoretical Bearing Modelsmentioning

confidence: 99%

Reciprocating machinery bearing analysis: Theory and practice

Goodwin

Nikolajsen

Ogrodnik

2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Figure 2 shows a rather coarse and somewhat irregular discretization of the 'contact zone' as produced with a commercial finite element package (ANSYS). The 111 nodes shown are related by triangular fluid finite elements (described by Boedo and Booker, 1997) and elastic solid stiffness matrices (obtained from tetrahedral elements via ANSYS). A comparison is made between solutions based on the new 'nodal' approach described by Booker (2005) and an earlier 'modal' approach reviewed by Boedo and Booker (1997).…”

Section: Introductionmentioning

confidence: 99%

IUTAM Symposium on Elastohydrodynamics and Micro-elastohydrodynamics

Snidle¹,

Evans²

2006

Solid Mechanics and Its Applications

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The fundamental questions arising in mechanics are: Why?, How?, and How much? The aim of this series is to provide lucid accounts written by authoritative researchers giving vision and insight in answering these questions on the subject of mechanics as it relates to solids.The scope of the series covers the entire spectrum of solid mechanics. Thus it includes the foundation of mechanics; variational formulations; computational mechanics; statics, kinematics and dynamics of rigid and elastic bodies: vibrations of solids and structures; dynamical systems and chaos; the theories of elasticity, plasticity and viscoelasticity; composite materials; rods, beams, shells and membranes; structural control and stability; soils, rocks and geomechanics; fracture; tribology; experimental mechanics; biomechanics and machine design.The median level of presentation is the first year graduate student. Some texts are monographs defining the current state of the field; others are accessible to final year undergraduates; but essentially the emphasis is on readability and clarity. (HB) ISBN-13 978-1-4020-4532-5 (HB) ISBN-10 1-4020-4533-6 (e-book) ISBN-13 978-1-4020-4533-2 (e-book)Published by Springer,

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Surface Roughness and Structural Inertia in a Mode-Based Mass-Conserving Elastohydrodynamic Lubrication Model

Cited by 48 publications

References 16 publications

Finite Element Method Applied to the Eigenvalue Analysis of Flexible Rotors Supported by Journal Bearings

Finite Element Method Applied to the Eigenvalue Analysis of Flexible Rotors Supported by Journal Bearings

Reciprocating machinery bearing analysis: Theory and practice

IUTAM Symposium on Elastohydrodynamics and Micro-elastohydrodynamics

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