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1
Application of an inhomogeneous CTMC model for a telephone call center
Burak M.
Studia Informatica
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2016
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Vol. 37, nr 2
15--27
EN
In this paper we consider modeling an inbound telephone call center, where the callers may balk or abandon, with an inhomogeneous continuous time Markov chain model. We further discuss the practical application of the uniformization method and compare it to traditional call center modeling methods based on stationary approximations.
PL
W artykule omawiane jest modelowanie telefonicznego call center za pomocą łańcuchów Markowa z czasem ciągłym. Model uwzględnia możliwość rozłączenia się klienta (opuszczenia kolejki), jeżeli nie może być on obsłużony natychmiast (balking) lub gdy okres oczekiwania przekracza jego cierpliwość (abandonment). Artykuł porównuje praktyczne zastosowanie metody uniformizacji oraz metod przybliżonych, zakładających (chwilową) stacjonarność systemu.
2
Content available Cu-etp copper monotonic tensile test modeling in ls-dyna software using hardening and damage models
Burak M., Pejkowski Ł., Skibicki D., Stopel M.
Journal of Polish CIMEEAC
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2015
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Vol. 10, no 1
23--28
EN
This paper deals with modeling of monotonic tensile test of Cu-ETP copper in numerical environment using finite element method. The research aims to verify the capabilities of LS-Dyna software in terms of modeling the strain hardening and damage of the material. The numerical analyses were proceeded by experimental tests to determine the materials constants of isotropic hardening model and constant required for modeling of material’s damage. Determined material constants were implemented into LS-Dyna environment using MAT_Damage_3 material model. The specimen model was built using eight-node hexahedrons. Both in case of experimental and numerical tests, the controlled parameter was displacement of the specimen. Obtained strain-stress curves were analyzed and conclusions were drawn.
3
Content available Sposoby modelowania elementów konstrukcji wsporczych infrastruktury drogowej
Stopel M., Burak M.
Postępy w Inżynierii Mechanicznej
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2014
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nr 3(2)
49--57
PL
W pracy przedstawiono wybrane sposoby modelowania słupa wsporczego znaku drogowego w programie LS-Dyna. Podjęto próbę wykazania zalet i wad dla poszczególnych rozwiązań. Podczas analizy skupiono się na sposobie modelowania słupa, upraszczając pozostałe elementy konstrukcji w tym utwierdzenie w podłożu.
EN
This paper presents some ways of modeling the supporting pole for a traffic sign in the LS-Dyna. An attempt was made to demonstrate the advantages and disadvantages for each solution. Analysis is focused on the modeling method, whereas the the remaining elements of construction are simplified.
4
Content available Porównanie klasycznych metod szacowania niskocyklowej trwałości zmęczeniowej z podejściem CDM
Burak M., Skibicki D.
Postępy w Inżynierii Mechanicznej
|
2014
|
nr 3(2)
5--12
PL
W pracy skupiono się na porównaniu podejść szacowania trwałości zmęczeniowej metodami tzw. klasycznymi (Morrow, Morrow (σm), SWT) – szeroko wykorzystywanymi w obliczeniach zmęczeniowych – z podejściem kontynualnej mechaniki uszkodzenia (Continuum Damage Mechanics – CDM).
EN
The study focused on a comparison of approaches for estimating the fatigue life of the so-called classical methods (Morrow, Morrow (σm), SWT) widely used in the fatigue calculation with the approach of Continuum Damage Mechanics (CDM).
5
Content available Tensometric verification of numerical calculations of frame structure of single axis manure spreader
Cichański A., Skibicki D., Lis Z., Burak M., Stopel M.
Journal of Polish CIMAC
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2013
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Vol. 8, no 3
15--23
EN
The study presents a manner of experimental testing of frame structure of single axis manure spreader. The work aimed at verification of strains determined by FEM in two areas. The first area was the manure box floor, which operated in harshest conditions. The other issue involved verification of correctness of maximum strains determined for the entire structure. Significant issue was to consider of variability of distribution and values of loads. The work suggests reflecting of the variable values through a set of manure box load variants describing stages of the manure spreader loading, unevenness of loading as well as unloading. Obtained by experiment values of stresses have been compared with results of numerical calculations by finite elements method which has proven their high compliance. Maximum stresses have been determined with accuracy of ca. 7%. A load variant affects determined strain values. Strains determined in variants reflecting loading and unevenness of load are characterised by a smaller error than in the case of variants reflecting unloading. This indicates to a greater accuracy of determination of strains with higher values.
6
Content available Structural analysis of the fan section of the air handling unit on dynamic load defined by seismic spectrum
Skibicki D., Burak M., Pejkowski Ł., Piotrowski M.
Journal of Polish CIMAC
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2013
|
Vol. 8, no 3
93--101
7
Content available Numerical analysis of frame structure of single axis manure spreader
Cichański A., Burak M., Stopel M.
Journal of Polish CIMAC
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2013
|
Vol. 8, no 3
9--14
EN
The study describes issues of research of frame structure of single axis manure spreader of loading capacity 14t. During the tests state of stress in frame structure and manure box have been specified. Manner of preparation of numerical model and results of tests performed with its use have also been described. On the basis of the results modification of the construction in critical areas has been proposed. Introduction of modifications resulted in improvement of frame structure of manure spreader strength state.
8
Content available Non-proportional load conditions
Pejkowski Ł., Skibicki D., Burak M., Piotrowski M.
Journal of Polish CIMAC
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2013
|
Vol. 8, no 3
57--62
EN
This paper deals with fatigue behavior of pure copper in different load conditions, including complex proportional and non-proportional loads. The material has been chosen due to its potential high sensitivity for nonproportional loads. The aim of this paper is search for relationship between the fatigue life of pure copper and shear stress vector paths in non-proportional load conditions.
9
Content available Influence of connection type on the fatigue life of welded
Mroziński S., Piotrowski M., Burak M., Pejkowski Ł.
Journal of Polish CIMAC
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2013
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Vol. 8, no 3
45--55
10
Content available Strain gauge verification of numerical analysis of forage trailer supporting structure
Cichański A., Burak M., Skibicki D., Lis Z.
Journal of Polish CIMAC
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2012
|
Vol. 7, no 3
41-46
EN
The paper presents experimental verification of forage trailer supporting structure. Conditions for performance of strain gauge measurements of stresses at selected frame points were presented. Results of strain gage measurements were compared with results of calculations by method of complete elements. Dozen percentage compliance of results of numerical calculations and experimental measurements was obtained. Maximum stresses were specified with accuracy of ca.2%. During measurements asymmetrical distribution of load in the frame was stated.
11
Content available Numerical analysis of forage trailer supporting structure
Cichański A., Burak M., Skibicki D., Stopel M.
Journal of Polish CIMAC
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2012
|
Vol. 7, no 3
29-34
EN
The paper discusses issues of examination supporting structure of forage trailer. Tests were applied to supporting structure, lowered in order to adjust the height of mix feeding for younger cattle. Lowering obtained by spreading of supports caused increase of the structure effort and increase of stress exceeding acceptable values. The paper describes the manner of preparation of numerical model and results of tests performed with its application. Based upon the results modification of the structure in critical areas was proposed. Implementation of such modifications resulted in improvement of effort of forage trailer supporting structure.
12
Content available Analytical verification of numerical analysis of forage trailer supporting structure
Cichański A., Burak M., Skibicki D., Pejkowski Ł.
Journal of Polish CIMAC
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2012
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Vol. 7, no 3
35-40
EN
The paper presents manner of analytical modelling of forage trailer supporting structure. Process of obtaining mathematical model from physical model was presented as well as final form of mathematical model in the form of equations describing deflections and stresses of the forage trailer construction. Results of analytical calculations were compared with results of numerical calculations with the method of complete elements. Good, 5%, compliance of the results of analytical and numerical calculations was achieved.
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