Fluid–structure interaction technique seems to be one of the most promising possibilities for theoretical analysis lubrication problems. It allows coupling different physical fields in computational task, taking into account between them. In this article, two sets fluid–structure analyses focusing on bearing performance evaluation are presented. One was applied a water-lubricated journal and other hydrodynamic thrust lubricated with oil. Steady-state operation considered both cases....

Water-lubricated bearings have been used for many years in shipbuilding, hydropower, and other industries because of their advantages, including extensive serviceable life, low coefficient friction, longevity shaft sleeve, good abrasion resistance, maintenance required, unit simplicity, no danger pollution, price. Various types water-lubricated sliding tested at the Technical University Gdansk, stiff composite bearings, ceramic as well elastic polymer ones. It was unequivocally determined...

Fluid film thickness in a compliant foil bearing is greatly influenced by the deflection of structure. Therefore, order to properly model performance bearing, it mandatory that structure due generated hydrodynamic pressure determined accurately. This article proposes an easy-to-use two-dimensional model, which takes into account detailed geometry bump foil-top assembly and interaction between bumps can predict stresses arbitrary load. The proposed first validated using finite element...

ABSTRACT Water-lubricated bearings have been applied to support ship screw shafts for over a hundered years. Development of plastic materials has caused that novel sliding polymers appeared available on the market and being approved by classification institutions, possible be in shipbuilding. However subject - matter literature there is no reference application fitted with metal or ceramic bushes Nevertheless they important merits such as low resistance motion, long service life stability...

Selecting the appropriate bearing system for rotor requires a good knowledge of available solutions and operating conditions machine. For newly designed machinery in adverse conditions, selecting bearings that ensure correct long-lasting operation can be extremely challenging. Difficulties increase when machine's parameters are beyond technical capabilities solutions. This article presents course design process results numerical experimental research prototype microturbine uses an innovative...

Hydropower industry increasingly frequently uses water lubricated bearings in turbines. This stems from the lack of negative impact such solution on environment. The paper presents an analysis influence shaft misalignment a turbine with main bearing its hydrodynamic capacity. theoretical was based results calculations for experimentally verified elastohydrodynamic lubrication (EHL) model. obtained showed stiffness bush material and degree bearing's

First gas-lubricated compliant foil bearings (CFBs) were built in the 1950s. Due to their significant advantages, such as oil-free operation, good tolerance bearing misalignment and very low maintenance, they have been penetrating applications for high speed compressors, air-cycle machines gas turbines. The work presented here investigates a novel idea of water-lubricated bearings, which could be used where environmentally friendly lubrication is desired, example hydroelectric turbines or...

The paper presents an analysis of the load-carrying capacity a historic hydrodynamic water-lubricated radial bearing unconventional segment design installed in Braniewo Hydroelectric Power Plant. aim calculations was to determine whether operates conditions or mixed lubrication, as well establish optimal geometry axial grooves allowing for highest capacity. Computer simulations were performed using proprietary ARTbear software developed at Machine Design and Vehicles Department Gdańsk...

Water lubricated rubber bearings are used from many years in ship building and other industry because of their advantages such as: long serviceable life, low coefficient friction, life shaft sleeve, good vibration damping, abrasion resistance, maintenance required, grit particles abrasives expelled through the grooves [1,2,3,4].

The paper presents a new idea of foil water-lubricated bearing and the methodology hydrodynamic characteristics calculations. Two different computer models were built in order to assess theoretical these bearings. Firstly structural model coupled with fluid which takes into account: flow deformed gap — specific design support friction support. second is based on structure interaction simulation. Due fact that it necessary define physical properties materials for models, special tribology...

The main purpose of the research was to determine possibilities and experimentally test benefits ofreplacing conventional oil lubrication with ecological water lubrication. Tests were carried out on a rigfor hydrodynamic radial bearings under conditions representative expected applications for bearingin turbines. Bearings made from polymer material PEEK (polyether ether ketone) tested understatic loads. tests two types lubrication: pure oil, viscosity ofISO VG 46. A comparison friction...

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Abstract The article presents the analysis, project, and experimental examination of an original rigid riser for Coil Tubing Pipes. principle operation is based on use friction forces. research included FEM analysis designed riser, calculations required bolt tensions, checking effect clamping force stress distribution in pipeline. results computer simulation were verified a specially test rig. described design was implemented LOTOS Petrobaltic platform, thus eliminating need purchase...

Abstract The article describes the result of theoretical research aimed at assessing loads and operating conditions a Coiled Tubing pipeline injecting water, suspended to mining platform Lotos Petrobaltic. For this purpose, appropriate calculation models have been developed using Finite Element Method (FEM), taking into account nature analyzed object its loads. analyzes were carried out for two pipes (previously operated newly proposed) differing in geometrical strength parameters. was...

The article introduces a design and analysis results of prototype ORC (organic Rankine cycle) turbo generator rotor assembly 300kW power, supported by tilting-pad bearings original design. calculations were performed for rotor. shaft this machine is with two radial bearings, lubricated an unusual lubricant – low-boiling-point agent. main objective the presented research was to perform verifying feasibility using hydrodynamic low-viscosity support rather massive high-speed developed determine...

The paper contains the results from a technical analysis of conditions operation hydrodynamic bearings supporting drums ore processing mills at KGHM Polska Miedź S.A. A theoretical was performed on grounds onsite examination and measurements principal dimensions interest. computer simulation covered characteristics oil film in as function bearing clearance, load, lubricant viscosity, journal tilting relation to two planes (horizontal vertical). indicate that currently operate close maximum...