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This Series provides the necessary elements to the development and validation of numerical prediction models for hydrodynamic bearings. This book with the specific case of internal combustion engine (ICE) journal bearing lubrication. Many examples, relating to various types of ICE, are presented.
Hydrodynamic Lubrication is the culmination of over 20 years close, collaborative work by the five authors and discusses the practical use of the formalization of low pressure lubrication. The work concentrates on the developments to journal and thrust bearings and includes subjects such as: • the dynamic behaviour of plain and tilting-pads • the thermal aspects • the positive and negative effects of non-cyclindricity and shape defects resulting from manufacturing or operation • the effects of inertia • the appearance of Taylor's vortices and of turbulence and their repercussions. The book contains an abundance of test results objectively compared with theoretical conclusions and a chapter on "technical considerations" to ensure that draft mechanisms will work satisfactorily under the imposed conditions. Hydrodynamic Lubrication is an essential reference book for future and practising engineers who want to put hydrodynamic and hydrostatic journal bearings and thrust bearings into operation under conditions of total safety.
This Series provides the necessary elements to the development and validation of numerical prediction models for hydrodynamic bearings. This book describes the rheological models and the equations of lubrication. It also presents the numerical approaches used to solve the above equations by finite differences, finite volumes and finite elements methods.
hydrodynamics, and bearing housing elasticity, the elastohydrodynamic simulation of the crankshaft/main-bearings system is performed in this dissertation.
The compliant marine bearing is a type of journal bearing which features an elastomeric bushing and commonly utilizes water as the bearing lubricant. The term compliant follows from the deformation of the elastomeric bushing at substantially reduced hydrodynamic pressures compared to bearings with bushings comprised of metals such as bronze, brass, or steel. The operating regime of marine bearings under purely hydrdocynamic action is aptly called soft-EHL in which elasto-hydrodynamic lubrication occurs at sub-Hertizan pressures within the bearings' conformal contacts. Marine bearing bushings are typically profiled designs with lubricant grooves distributed around their circumference. The lubricant grooves serve as axial flow passages and contribute negligibly to the generation of hydrodynamic bearing pressures. The regions between the lubricant grooves are referred to as lands and generate hydrodynamic bearing forces which support static an dynamic radial loads applied to the bearings. Compliant marine bearings primarily serve in marine applications as stern tube and strut bearings, which support the propeller driveshaft at the rear of shipping vessels. This work provides a detailed theoretical development of a Reynolds equation-based model suitable to predict the static and dynamic performance of hydrodynamic bearings with compliant bushings. The dynamic performance is embodied in linearized dynamic coefficients which are calculated from a perturbed set of differential equations. The numerical solution of the model is exercised through a wide number of application cases to verify several modeling assumptions related to: bushing compliance, fluidinertia, and turbulence. Primarily, a simplified slider bearing geometry is investigated as it functions as a surrogate for a single stave in a full marine bearing. A FRF-based method to predict the dynamic behavior of hydrodynamic bearings (and seals) within a higher-fidelity CFD environment has been developed and deployed by leveraging the open-source continuum mechanics library OpenFOAM. The method is successfully employed in the evaluation of the dynamic coefficients of rigid slider and journal bearing geometries. The dynamic coefficients predicted by the FRF-based approachand the perturbed Reynolds equation showed good coincidence for the linear slider and journal bearing geometries and operating conditions considered. The FRF-based approach for the identification of bearing dynamic coefficients is general and applicable to bearings which feature compliant bushings or complex geometric features. Numerical results from models of varying complexity are compared with each other in an effort to verify the assumptions associated with the compliant, perturbed Reynolds equation. Modeling assumptions regarding lubricant inertia, turbulence, and the constitutive modeling of the bearing bushing are explored in detail.