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1
Content available Effective algorithm for structural optimization subjected to fatigue damage and random excitation
Sága M., Vaško M., Ságová Z., Handrik M.
Zeszyty Naukowe. Transport / Politechnika Śląska
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2018
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z. 99
149--161
EN
The aim of the paper is to present the computationally timeconsuming task of simulating the process of randomly oscillating thin-shell structures to realize an optimal design with limitations in terms of fatigue damage. The most important aim here is to design an effective optimization algorithm and choose an appropriate approach for the evaluation of multiaxial fatigue damage in the context of the random and non-proportional character of stress in the structure when considering the standard finite element model. The authors propose their own optimization algorithm, which is described in the present study and, on the basis of tests, has proven to be suitable for the aforementioned technical problems. The proposition of algorithms for calculating the accumulation of fatigue damage in non-proportional and multiaxial stresses (especially in terms of the application of rainflow analysis by decomposition of the equivalent stress, as determined by the appropriate “fatigue” criterion) is very important in such computational processes. The entire computational process was implemented in MATLAB with the “Discret_Opt_Fat” main control program. The article presents the theoretical basis for the presented complex problem solution, its algorithmization and the technical application.
2
Content available remote Structure Analysis and Fatigue Life Prediction of the Large Scale Handling Device
Vaško M., Handrik M., Sága M., Kopas P., Vaško A.
Machine Dynamics Research
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2010
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Vol. 34, No. 4
102-109
EN
The goal of the paper was to present predictions of the fatigue lifetime of the large scale welded construction. The structural modelling and the stress-strain analysis were realised using finite element method. To determine the fatigue damage or the residual lifetime the "von Mises" equivalent stress was compared with normal stress from classical S-N (Wohler) curve (Fig. 5). The results were compared with reality, i.e. with measuring on real equipment. Distribution of the critical points confirmed consensus between both approaches (computational and experimental).
3
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.
4
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.
5
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.
6
Content available remote Mass Minimising of Truss Structures Subjected to Prescribe Fatigue Life
Sága M.
Machine Dynamics Problems
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2004
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Vol. 28, No. 4
101-106
EN
The paper presents the application of the discrete optimisation of truss structures subjected to prescibed fatigue life. It was considered the solution of the linear truss or frame mechanical systems under random excitation and rainflow decomposition of the stress response in time domain and the application of Rajchers computational way for problems analysed in freguency domain. The using optimising approach was realised by the solution program OPTIM_FAT.
7
Content available remote Lateral Forces Effect on Safety of Driving in Curve
Hajská H., Fandáková M., Kopecký M., Slabeycius J., Sága M.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
119-124
EN
In this contribution we presented measurements of lateral forces on a drum-testing machine. Measurements of lateral forces are introduced in tables and figures in dependence on radial load in different angles directional deviation.
8
Content available remote Application of Linearization Technique in Stochastic Dynamics
Sága M., Vavro J.
Machine Dynamics Problems
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2004
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Vol. 28, No. 4
107-113
EN
The paper presents the solution of the stochastic vibration of non-linear mechanical systems with Gaussian random excitations. It's realised the short review abot linearization techniques in stochastic dynamic. The presented method was used to solution of the inelastic truss structures.
9
Content available remote An Analysis of the Load Exerted on a Bearing-Type Transferring Fixed on the Frame at the Top or at the Bottom
Fandáková M., Sága M.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
95-100
EN
A building line is a common type of equipment used in the rubber-processing industry to build radial truck tyres in the semi-automatic production mode. The bearing-type transferring is part of the equipment. The paper presents an analysis of the load exerted on the bearing-type transferring depending on its fixation at the top of the frame. The paper also presents results of the stress and frequency analysis of the transferring.
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