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1
Content available Simplified computation methodology for contact forces on tapered rolling bearing with flexible parts
Sapietová A., Novák P., Šulka P., Sapieta M., Jakubovičová L.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2018
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z. 99
177--182
EN
Durability calculations of bearings take in account the distribution of forces on rollers. Calculation of these forces in flexibly supported rings is the aim of the paper. We use simplified finite element (FE) models of bearings, which are integrated into the external geometry. This approach can consider the stiffness of the surrounding structure as well as the clearance of the bearing rings, the misalignment of bearings, shaft deflections, and the forces of crowning rollers. The presented results show an influence of the initial radial interference of the outer ring with housing on the distribution of forces in bearing rollers. As the radial stiffness of the housing is close to the stiffness of the outer ring interference, this causes considerable deformation of the housing. The presented approach is also able to calculate the distribution of contact pressures over any rolling element.
2
Content available remote Some Notes on Analysis of Bending and Torsion Combined Loading
Jakubovičová L., Sága M., Kopas P., Handrik M., Vaško M.
Machine Dynamics Research
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2010
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Vol. 34, No. 3
97-105
EN
The purpose of this paper is to present procedure of stress and strain distribution analyses at the testing sample. Experimental device is designed for combined bending - torque loading. Structural design of the equipment allows loading by constant turn of the clamping parts. The stress and strain magnitude in test sample depends on the shape and material sample. To obtain the exact solution of the stress and strain values is generally very difficult and therefore for their specification was used FE method and experimental measurement using optical system ARAMIS.
3
Content available remote Identification of the BW Hysteric Material Model Parameters and Application on Energy Fatigue Curve
Sága M., Vaško M., Kopas P., Jakubovičová L.
Machine Dynamics Research
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2010
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Vol. 34, No. 4
79-87
EN
The paper deals with the numerical computational tools application for the hysteretic curve identification using Karray-Bouc (KB) and Ramberg-Osgood (RO) material models. The Karray-Bouc model parameters was determined from Ramberg-Osgood model and Manson-Coffin curve parameters. Using special Matlab's procedures we can calculate dissipative (hysteretic) energy density per cycle and express Manson-Coffin curve in energy version.
4
Content available remote Computational Simulations of Stress Distribution in Surrounding of Graphite Particles
Kopas P., Handrik M., Jakubovičová L., Sága M.
Machine Dynamics Research
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2010
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Vol. 34, No. 3
115-123
EN
The goal of the paper has been to present a computational simulation of the stress distribution in the surrounding of graphite particles. There were designed four algorithms for creation fields with random shape of graphite particles. Based on quantitative and qualitative evaluating of these algorithms it can be seen that the only appropriate field generation procedure with graphite particles is algorithm call "diffusion of carbon". Main objective of statistical processing of analysis result is determination of the 99.8% quantile stress concentration function for one or more graphite particles.
5
Content available remote Trefftz functions using the fundamental solution with the singularity outside the domain
Jakubovičová L., Vaško M., Kompiš V.
Computer Assisted Mechanics and Engineering Sciences
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2003
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Vol. 10, No. 4
515-521
EN
Two types of Trefftz (T-) functions are often used - fundamental solutions with their singularities outside the given region and general solutions of homogenous differential equations. For elasticity problems the general solution of the homogeneous differential equation (equilibrium equation in displacements known as Lame-Navier equations) can be found in the polynomial form. In this paper we present the first type of T-functions. The paper deals with the investigation of accuracy and stability of the resulting system of discretized equations in relation to the position of the source (singularity) point. In this way non-singular reciprocity based boundary integral equations relate the boundary tractions and the boundary displacements of the searched solution to corresponding quantities of the known solutions. It was found that there exist an optimal relation of the distance of the singularity to the distance of the collocation points where both the integration accuracy and numerical stability are good.
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