Wyniki wyszukiwania - Biblioteka Nauki

1

Numerical modeling of elastomeric bearings in structural engineering

100%

Gerhaher U. , Strauss A. , Bergmeister K.

Advances in Materials Science

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2011

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tom Vol. 11, nr 3(29)

51-63

EN

The intention of this paper is the discussion of different possibilities for the numerical modeling of elastomeric bearings. It is focused on issues of the complex material behavior and the specific mechanical conditions of the bearings. The relevant considerations are based on the experiences from extensive material tests on elastomer and reinforcement as well as from loading and deformation tests on full scale bearings. It shows the possibilities and the limitations of the numerical bearing models as a tool for research and bearing design.

2

Rock strength anisotropy in high stress conditions: a case study for application to shaft stability assessments

80%

Watson J. M. , Vakili M. , Jakubowski M.

Studia Geotechnica et Mechanica

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2015

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tom Vol. 37, nr 1

115--125

EN

Although rock strength anisotropy is a well-known phenomenon in rock mechanics, its impact on geotechnical design is often ignored or underestimated. This paper explores the concept of anisotropy in a high stress environment using an improved unified constitutive model (IUCM), which can account for more complex failure mechanisms. The IUCM is used to better understand the typical responses of anisotropic rocks to underground mining. This study applies the IUCM to a proposed rock shaft located in high stress/anisotropic conditions. Results suggest that the effect of rock strength anisotropy must be taken into consideration when assessing the rock mass response to mining in high stress and anisotropic rock conditions.

3

Application of the Control Volume Method using the Voronoi polygons for numerical modeling of bio-heat transfer processes

80%

Ciesielski M. , Mochnacki B.

Journal of Theoretical and Applied Mechanics

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2014

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tom Vol. 52 nr 4

927--935

EN

In the paper, the problem concerning the numerical modeling of thermal processes in the domain of a biological tissue being in thermal contact with the environment is discussed. The changing ambient temperature causes that the non-steady heat transfer process is con- sidered. The cross-section of the forearm (2D problem) is treated as a non-homogeneous domain in which the sub-domains of skin tissue, fat, muscle and bone are distinguished. From the mathematical point of view, the boundary-initial problem described by the system of energy equations (the Pennes equations), boundary conditions on the external surface of the system, boundary conditions on the surfaces limiting the successive sub-domains and the initial condition is analyzed. At the stage of numerical computations, the Control Volume Method using the Voronoi polygons is applied. In the final part of the paper, examples of computations are shown.

4

Numerical Modeling of Self-Ignition of Energetic Materials

80%

Sućeska M. , Matečić-Muśanić S.

Central European Journal of Energetic Materials

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2004

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tom Vol. 1, nr 1

23-41

EN

Thermal decomposition of energetic materials is accompanied by generation of heat, and under certain conditions may lead to the well-known phenomenon of the self-ignition (or thermal explosion). Therefore, it is of great concern of explosive community to predict whether or not a specimen of energetic material will ignite or not under given conditions (defined primarily by a specimen mass and shape, surrounding temperature, etc.). In order to describe the reactive heat conduction phenomena in an infinite slab, cylindrical, and spherical geometry of an explosive material, an own computer program, based on the thermal explosion theory and the finite difference method, was developed. The program was tested by the comparison of calculated times to ignition for some standard high explosives with times to ignition determined experimentally, as well as with times to ignitions calculated by some other authors. The results of calculations were also compared with the results of calculation according to an analytical solution of the heat balance equation derived by Frank-Kamenetskii. It was found out that not only values of the activation energy and pre-exponential factor, but also the kinetic model of thermal decomposition used in the calculation, have a crucial influence on the results of calculation. It was also shown that the Frank-Kamenetskii equation gives considerably lower values of the times to ignition, and higher values of the critical temperatures for explosives studied.

5

Comparison of numerical models for hydroforming of X-shapes

80%

Sadłowska H. , Kocańda A.

Computer Methods in Materials Science

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2007

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tom Vol. 7, No. 2

294-298

EN

Hydroforming could be regarded as one of the most advanced and complicated process of metal forming. The common way of hydroforming is to deform sheet metal or tube by means of fluid pressure. By this way some products of very complicated shapes could be obtained. The hydroforming is very useful for producing whole components that would otherwise be made from multiple stampings joined together. For example, such shapes are difficult or impossible to produce by another processes like welding or casting. Hydroforming processes are usually associated with very high strains which lead to failures commonly observed in sheet metal forming, e.g. fracture or wrinkling. These failures are difficult to avoid by designing the process in a traditional way and finding the process parameters by trial and error method. Recently numerical modeling has proved to be a powerful tool for development of hydroforming processes. Hydroforming has been considered as a kind of sheet metal forming process. Majority of numerical models for sheet metal forming has been based on 2D geometry and shell elements in order to simplify the calculations. In this paper, there have been presented both 3D-shell and 3D-solid models for numerical modeling of hydroforming of copper X-shapes. This process has been chosen because of many difficulties in finding proper process parameters by a common designing way. The X-joint hydroforming is conducted to bulge a cylindrical tube with internal pressure and axial load using the displacement of the compressing punches. Proper process parameters, i.e. internal pressure and axial feeding, allow to obtain an X-shape without failures. If internal pressure is too high, the bursting will occur. On th other hand, if the axial feeding force is too high then the wrinkling of the tube will occur. There have been performed experimental tests on hydroforming of X-shapes. Tubular copper blanks with the initial outer diameter 22 mm and the wall thickness 1 mm were used to make X-shapes. A straight tube blank of 120 mm in the length was placed and restrained in the die that determined the final shape of the component. The tube was sealed at the ends by the axial punches. As the velocities of the left and right axial punches were kept constant during deformation process, then the axial feeding force was a result of deformation resistance of a tube blank. On the other hand, the internal pressure was changing according to specified internal pressure versus punch displacements curve. The computer simulations of hydroforming of X-shapes were made using MSC.MARC software. The geometrical models and process parameters corresponded with experimental ones. There were created two numerical models. 3D-membrane/shell elements describing hydroformed tube were used in the first model. Second model was built with typical 3D-solid elements. The results of computer simulations have been compared with the results of experiments. Both 3D-shell and 3D-solid models have provided quite high accuracy in getting the X-shape geometry for various process parameters. However, only 3-D model has been useful to analyse thickness distribution in X-shapes. The calculated stress and strain states as well as thickness ditributions have been taken into account to analyse failures occuring during hydroforming.

PL

Modelowanie komputerowe jest bardzo pomocne w rozwoju procesów kształtowania hydromechanicznego. Dotychczas stosowano różnorodne modele numeryczne, ale wobec braku porównań trudno było ocenić ich przydatność do modelowania poszczególnych procesów. W referacie przedstawiono wykorzystanie modeli 3D-shelI oraz 3D-solid do modelowania hydromechanicznego kształtowania czwórników z miedzi. Wyniki obliczeń porównano z wynikami doświadczeń. Uzyskano bardzo dużą dokładność obliczeń dla obydwu modeli przy wyznaczaniu kształtu czwórników dla różnych parametrów procesu. Jednakże to model 3D-solid okazał się znacznie lepszy i dokładniejszy przy analizie rozkładu grubości ścianek czwórników i historii obciążenia.

6

An analysis of the influence of fracturing technological parameters on fracture propagation using numerical modeling

80%

Dudek J. , Janiga D. , Wojnarowski P.

AGH Drilling, Oil, Gas

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2017

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tom Vol. 34, no. 3

677--690

EN

Nowadays, hydraulic fracturing is one of the most common treatments for both conventional and unconventional fields, a stimulation technique designed to increase well production through the reduction of flow resistance caused by the drilling process or genuine reservoir properties. In this article the planar, three-dimensional numerical model of hydraulic fracturing treatment is presented. Based on the given model, the influence analysis of the basic technological parameters of the fracturing in a directional well on fracture propagation was conducted. The presented analysis shows the crucial role of numerical modeling in the process of hydraulic fracturing treatment design. The outcomes allowed us to identify the sensitivity of the obtained fracturing effects on the change of the treatment of technical parameters.

7

Numerical modeling of open pit (OP) to underground (UG) transition in coal mining

80%

Nguyen P. M. V. , Niedbalski Z.

Studia Geotechnica et Mechanica

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2016

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tom Vol. 38, nr 3

35--48

EN

The primary objective of the present paper is an attempt at evaluating the influence of sub-level caving operations on the slope stability of a still-functioning open pit coal mine in Vietnam. Initially, various methods of predicting the impact of under- ground mining on surface stability are discussed. Those theoretical considerations were later utilized in the process of constructing a Flac-2D-software-based numerical model for calculating the influence of underground operation on the deformation and possible loss of stability of an open pit slope. The numerical analysis proved that the values of open pit slope displacements were affected mainly by underground exploitation depth, direction of operation (i.e., from one slope to the other) and the distance from the slope plane. Real geomechanical strata parameters from the Vietnamese coal basin of Cam Pha were used in the modeling process. The paper is, therefore, a critical review of the hitherto proposed methods of predicting the impact of underground operation (UG) on open pit mining (OP), illustrated with selected examples of case studies on OP-UG interaction, followed by an original experiment based on numerical modeling method. This is first such study for the genuine conditions of the coal mining in Vietnam. The obtained results, however, should not be generalized due to a highly specific character of the analyzed phenomenon of mining-induced surface deformation. The practical implications of the study may occur extremely useful in the case of an UG-OP transition. Such a transition is often necessary for both technical and economical reasons, as in some coal basins open pit operations at greater depths occur unfeasible, which calls for a proper selection of parameters for a planned underground operation.

8

Numerical model of detector for in vivo internal dosimetry in radiological incidents

80%

Ośko J. , Tymińska K.

Polish Journal of Medical Physics And Engineering

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2012

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tom 18

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nr 2

29-39

EN

The aim of this work was to create a numerical model of scintillation detector and to check whether such detector can be used for the measurements of internal contamination in emergency conditions. The purpose of the measurements would be only detection of possible contamination, without identification of radioactive isotopes, and hence without estimation of effective dose. However, in emergency conditions, it is sufficient for the rapid selection of a group of contaminated persons, who should be subjected to careful inspection in the laboratory conditions. The calculations were performed for three detector positions relatively to the phantom. The distribution of dose rate was also calculated, in order to find the best geometry for dose rate measurements around human body. Another problem under consideration was the possible influence of radioactive contamination in the environment on the registration of the gamma spectrum emitted from the whole body phantom. Performed calculations showed that there is a possibility to measure internal contamination outside laboratory, even in contaminated area.

9

Numerical Modeling of Ice Jam Formation in the Wloclawek Reservoir

80%

Kolerski T.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2011

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tom Vol. 15, No 3-4

283-295

EN

Ice jam formation in a run-of-the-river reservoir and the effects of ice jam on water levels and water velocity were simulated using a two-dimensional model for simulating river ice dynamics (DynaRICE). The record ice jam of January 1982 in the Wloclawek Reservoir is also examined here. The simulation showed that the ice jam in question was formed by surface ice produced in the Vistula River, upstream of the reservoir. The effect of thermal production of suspended frazil in the reservoir on ice jam was negligible. The simulated water level as well as the ice jam profile were in agreement with the observed data. The ice discharge upstream of the reservoir and the volume of ice in the Wloclawek Reservoir were calculated. The results showed that there was less ice in the reservoir than claimed in previous literature. Suspended frazil and the undercover transport mechanism were not taken into account in this study.

10

Uwarunkowania techniczne i geomechaniczne drążenia głównej komory laboratorium astrofizycznego w górotworze kopalni Polkowice-Sieroszowice

80%

Pytel W. M.

Górnictwo i Geoinżynieria

|

2011

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tom R. 35, z. 2

493-500

PL

Kopalnia Polkowice-Sieroszowice jest jednym z siedmiu lokalizacji rozpatrywanych jako miejsce budowy podziemnego laboratorium astrofizycznego w ramach europejskiego projektu LAGUNA. Dokonany przegląd kopalnianych warunków techniczno-infrastrukturalnych, geologicznych i geomechanicznych wykazał, że jest ona doskonała pod każdym względem jako miejsce posadowienia ogromnego detektora cząstek neutrino wypełnionego 100 tys. tonami ciekłego argonu. W prezentowanej pracy przedstawiono procedurę trójwymiarowego modelowania numerycznego (metoda różnic skończonych) zachowania się głównej komory detektora GLACIER wydrążonej w masywie polkowickiego anhydrytu. Ogólnie, wszystkie skały zwięzłe (anhydryty, dolomity, piaskowce) zostały zamodelowane jako materiały sprężysto-plastyczne (idealnie plastyczne lub z osłabieniem). Ze względu na wyjątkowo duże rozmiary projektowanego obiektu (wysokość 47,5 m, średnica 79 m) a także na wyjątkowo wielkie szkody w przypadku jego niestateczności, analizę przeprowadzono dla wystarczająco dużego zapasu bezpieczeństwa. W analizie uwzględniono także przestrzennie niejednorodny stan naprężeń pierwotnych.

EN

The Polkowice-Sieroszowice mine is considered to be a candidate for the future pan-European underground laboratory analyzed in the framework of the LAGUNA project. The review of the local technical/infrastructural, geological and geomechanical conditions has proved that it is a perfect place to host the 100 kton liquid argon detector. The geomechanical models have been developed and solved using FLAC3D software utilizing the finite differences method. Calculation results have been presented in the form of 3D stress and translation distribution contours, and the areas prone to instability occurrence have been indicated as well. All rocks of the coherent type (anhydrite, dolomite, sandstone) have been modeled as elastic-plastic (some of them ideally plastic, some of them with strain softening). Due to extremely large size of the analyzed object (47.5 m of height, 79 m of the diameter) as well as due to severe consequences of its possible failure, the geomechanical considerations have been performed for a sufficiently large safety margin. The heterogeneous state of the primary stress with different spatial characteristics has been also considered in the analyses.

11

Numeryczne modelowanie pola georadarowego przy pomocy metody FDTD

80%

Gołębiowski T.

Geoinformatica Polonica

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2006

|

tom T. 8

23-36

PL

W artykule przedstawiono sposób numerycznego modelowania elektromagnetycznego (georadarowego) pola falowego przy pomocy metody różnic skończonych w wersji FDTD (Finite Difference Time Domain Method). Obecnie stosuje się kilka metod modelowania pola georadarowego, a najpopularniejszą z nich jest metoda FDTD, z tego powodu autor ograniczył się tylko do opisu tej metody. W pierwszej części artykułu zamieszczono krótkie wprowadzenie do metody georadarowej (GPR), aby nie pojawiały się niejasności w drugiej części, opisującej specyfikę modelowania pola georadarowego. Druga część artykułu przedstawia szeroki opis sposobu przygotowania modelu numerycznego i prowadzenia symulacji komputerowych z uwzględnieniem specyfiki metody georadarowej.

EN

In the paper the method of numerical modelling of electromagnetic (georadar) wave field is described. The only method discussed is the FDTD (Finite Difference Time Domain Method), because among the different methods using numerical modelling of georadar (GPR) wave field this one is the most popular. The first part of the paper includes a short introduction to the GPR method, in case any ambiguities might appear in the second part of the paper. The second part presents a rich description of the way of the numerical model constraction and the way of carrying out computer simulation for GPR method.

12

Hip joint implants - survey of numerical modeling

80%

Bajer C. , Małdyk P. , Kowalczewski J.

Journal of Theoretical and Applied Mechanics

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1999

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tom nr 3

435-454

EN

In the paper the discussion of the modeling of hip joint implants is presented. the historical attempts to implant construction finally led to complex solutions. To date almost all experiences have learned from clinic observation and rather tests and trial methods than systematic research. Numerical simulations have been limited to simple stress analysis. All phenomena responsible for the damage in the treated joint are not fully explained. The comlexity of the problem is presented in the paper. The stress concentration in the region of rigid inclusion is pointed as one of the mechanical destructive factors. The change of the stem form and material rigidity cuuld reduce extremal stresses by 10-20%.

PL

W pracy omówiono modelowanie implantów stawu biodrowego. Historyczne próby ich konstruowania doprowadziły do bardzo złożonych rozwiązań. Dotąd niemal wszystkie doświadczenia zdobywano w obserwacjach klinicznych i próbach, a nie w wyniku systematycznych badań. Numeryczne symulacje ograniczono do prostej analizy stanu naprężenia. Większość zjawisk odpowiedzialnych za uszkodzenia badanych stawów nie jest w pełni wyjaśniona. W pracy zwrócono uwagę na złożoność zagadnienia. Za jeden z czynników niszczących uznano koncentracje naprężeń w strefach sztywnych wtrąceń. Zmiana kształtu trzpienia i sztywności materiału pozwala zmniejszyć ekstremalne naprężenia o 10-20%.

13

Parallel computing of metal forming simulation in QForm software

80%

Gerasimov D. , Gartvig A.

Computer Methods in Materials Science

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2016

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tom Vol. 16, No. 3

139--142

EN

In this study, the effectiveness of parallelization of data and tasks implemented in QForm software is investigated. The dependence of the number of simultaneously working logical processors or cores of a multicore CPU on the solving time of metal forming simulation is shown. The simulation processes are parallelized in QForm software by means of Intel® Math Kernel Library, so the principle of parallelization is not described in this article. The aim was to show how the existing solution could he effectively used for simulation of metal forming processes and which solving processes can he parallelized.

PL

W pracy badano efektywność zrównoleglenia danych i zadań zaimplementowanych w programie QForm. Pokazano zależność liczby pracujących równocześnie procesorów lub rdzeni wielordzeniowej CPU od czasów obliczeń dla symulacji odkształcania materiałów. Symulacje zrównoleglono w programie QForm za pomocą Math Kernel Library i zasady zrównoleglenia nie są opisane w artykule. Celem pracy było pokazanie jak rozwiązanie może zostać efektywnie wykorzystane w symulacjach plastycznej przeróbki i które procesy obliczeniowe mogą zostać zrównoleglone.

14

Numerical model of plastic destruction of thick steel structural elements

80%

Kowalski J. , Kozak J.

Polish Maritime Research

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2018

|

tom nr 2

78--84

EN

In the shipbuilding industry, the risk of brittle fracture of the structure is limited by using certified materials with specified impact strength, determined by the Charpy method (for a given design temperature) and by supervising the welding processes (technology qualification, production supervision, non-destructive testing). For off-shore constructions, classical shipbuilding requirements may not be sufficient. Therefore, the regulations used in the construction of offshore structures require CTOD tests for steel and welded joints with a thickness greater than 40 mm in the case of high strength steel and more than 50 mm in the case of other steels. Classification societies do not accept CTOD test results of samples with a thickness less than the material tested. For this reason, the problem of theoretical modeling of steel structure destruction process is a key issue, because laboratory tests for elements with high thickness (in the order of 100 mm and more) with a notch are expensive (large samples, difficulties in notching), and often create implementation difficulties due to required high load and range of recorded parameters. The publication will show results and conclusions from numerical modeling of elastic properties for steel typical for offshore applications. Calculations were carried out at the Academic Computer Centre in Gdańsk.

15

Investigations of Dual Plug Argon Blowing for Efficient Mixing at Ladle Furnace Station

80%

Warzecha M. , Hutny A. , Warzecha P. , Kutyła Z. , Merder T.

Archives of Metallurgy and Materials

|

2021

|

tom Vol. 66, iss. 2

561--572

EN

The article presents the results of model research concerning the change of technology of argon blowing into liquid steel at the ladle furnace, using the dual plug system. The results of numerical simulations were verified with experimental data carried out on the water model device. The verified model was used to perform numerical simulations to predict the impact of using a new gas injection technology - with different flow rates - on the time to achieve the assumed degree of metal chemical homogenization after alloy addition. Simulation results show that argon blowing metal bath in dual plug mode can effectively reduce mixing time compared to conventional technology with the same gas flow rates. Generally, the use of the dual plug system is beneficial for reducing the bath mixing time, however, the assumed optimal proportion of gas blown through individual plug should be followed. Finally, numerical predictions were used to perform experimental melt under industrial conditions. Industrial verification has clearly confirmed the validity of numerical modeling and showed that also in industrial conditions, a shorter time of chemical homogenization was obtained for the dual plug system.

16

Wykorzystanie modelowania numerycznego procesów sufozji w ocenie stanu i rewitalizacji małych elektrowni wodnych

80%

Bolt A. , Sukowski T. , Szudek W.

Inżynieria Morska i Geotechnika

|

2006

|

tom nr 4

232-240

PL

Przedstawiono przykłady zastosowania standardowych programów komputerowych do symulacji procesów sufozyjnych w obiektach małych elektrowni wodnych i ich wykorzystywania do oceny stanu budowli ziemnych oraz podłoża. Celem jest wybór optymalnych metod zabezpieczenia tych budowli. Podstawowymi warunkami osiągnięcia powyższego celu jest udokumentowana, sprawdzalna diagnoza stanu obiektu, dostosowana do potrzeb zespół monitoringu parametrów określających stan obiektu, sprawdzalna modelowo zasadność i skuteczność wykonywania prac związanych a usuwaniwm przyczyn zagrożeń. Przedstawiono na przykładach metodykę postępowania wraz z wynikami obliczeń i pomiarów oraz wnioskami dotyczącymi przewidywania zagrożeń obiektu i usuwania przyczyn ich powstawania.

EN

Example of application of standard software for simulation of piping (suffusion) in small water-power plants and its implementation for an assessment of the state of earth dams and subsoil in order to select effective method for the protection. Proper diagnosis, suitable monitoring system and efficiency of justified remedial works. Some examples with processing methodology supported by results of measurements and numerical simulations are shown.

17

Analiza numeryczna procesu kucia matrycowego na gorąco odkuwki wydłużonej z występem na końcu

80%

Hawryluk M. , Rychlik M. , Krawczyk J. , Gronostajski Z. , Nowak B. , Jabłoński P.

Hutnik, Wiadomości Hutnicze

|

2017

|

tom Vol. 84, nr 8

317--321

PL

W pracy przedstawiono wyniki modelowania numerycznego procesu kucia odkuwki wydłużonej z występem na końcuadaptera realizowanego na prasie korbowej w matrycach otwartych na gorąco. Celem analizy była poprawa przemysłowego procesu wytwarzania odkuwki. Termomechaniczny model kucia odkuwki adaptera z odkształcalnymi narzędziami opracowano przy użyciu oprogramowania Qform 7. Do zbudowania modeli narzędzi kuźniczych wykorzystano program Catia V5R20. W wyniku przeprowadzonego modelowania uzyskano, m.in.: rozkłady odkształceń plastycznych i temperatur dla odkuwki i narzędzi oraz dodatkowo rozkładu naprężeń średnich i zastępczychw matrycach oraz przebiegów sił kucia. Otrzymane wyniki pozwalają na pełną analizę procesu kucia, w tym:identyfikację potencjalnych wad odkuwki (zakuć) oraz obszarów narzędzi najbardziej podanych na uszkodzenie. Wykorzystanie uzyskanych wyników z modelowania numerycznego pozwoliło na poprawę i wprowadzenie usprawnień w przemysłowym procesie kucia.

EN

The paper presents the results of numerical modeling of the forging process of the forging with elongated end-piece – an adapter made on crank press in hot dies with flash. The objective of the analysis was to improve the industria lforging process.Thermomechanical model of adapter forging with deformabletoolsdevelopedusing the software Qform 7. To buildmodels of forging tools used in the program Catia V5R20.As a result of the modeling was obtained: distributions of plastic deformations and temperatures for forgings and tools and additionally distribution of meanand von Misses stresses in dies and as well forging forces.The obtained results allow for a full analysis of the forging process, including: identification of potential defects of forgings (laps) and areas of the tools most reported for damage. Using the resultsof numerical modeling was allowed to improve and putim provements in the industrial forging process.

18

Numerical Assessment of the Experimental Thermoelectric Cooling System Effectiveness

80%

Gołębiowska J. , Widomski M. K.

Journal of Ecological Engineering

|

2022

|

tom Vol. 23, nr 12

99--110

EN

Solid-state thermoelectric elements, such as thermoelectric (TE) modules, can be used as cooling devices. Small-sized TE modules, characterized by: lack of moving parts, no required refrigerants application as well as variable possible installation and operation positions, allow, in several specified cases, achieving the advantage in cooling process over the conventional refrigeration devices. This paper presents the results of the preliminary numerical determination of energetic efficiency of thermoelectric cooling system, applied for cooling a small-scale experimental room. The heat exchangers used in the cooling system consisted of heat sinks and radiators installed on the both sides of the TE module. The numerical assessment included in this paper, based on a 3D model reflecting the experimental room and thermoelectric cooling system, allowed determining the relation between TE module power supply characteristics and cooling effects, as well as time-related temperature distribution inside the modeled experimental room. The commercial modeling software FLUENT, ANSYS 12.0 by ANSYS Inc. was applied in numerical calculations. The results of the performed laboratory studies were used as a basis for model development, required input data, initial and boundary conditions. The results of laboratory tests showed the influence of amperage of power supply on the efficiency of cooling characteristics, as well as distribution of air temperature inside the experimental room. Calibration and validation of the developed model was also based on the results of laboratory experiment. The obtained results of numerical calculations showed the influence of amperage of power supply on efficiency of cooling characteristics as well as distribution of air temperature inside the experimental room.

19

Advances and generic problems in instrument design methodology

80%

Khan S. H. , Finkelstein L.

Metrology and Measurement Systems

|

2007

|

tom Vol. 14, nr 1

39-57

EN

The paper is based on a long-term programme of research on mathematical modelling and design of instruments and instrument elements in the Measurement and Instrumentation Centre of City University, London. It considers the principal generic problems of design methodology of instrument systems and aspects of the research agenda that arises from them. It describes, in particular, recent advances in the computer aided design of sensors and actuators.

20

Experimental Methods of Validation for Numerical Simulation Results on Steel Flow through Tundish

80%

Pieprzyca J. , Warzecha P. , Merder T. , Warzecha M.

Archives of Metallurgy and Materials

|

2016

|

tom Vol. 61, iss. 4

2057--2060

EN

The article presents experimental results on the impact of tundish flow regulator influencing the liquid steel flow course. The research was conducted based on the hybrid modelling methods understood as a complementary use of Computational Fluid Dynamics (CFD) methods and physical modelling. Dynamic development of numerical simulation techniques and accessibility to highly advanced and specialized software causes the fact that these techniques are commonly used for solving problems related to liquid flows by using analytical methods. Whereas, physical modelling is an important cognitive tool in the field of empirical identification of these phenomena. This allows for peer review and specification of the researched problems. By exploiting these relationships, a comparison of the obtained results was performed in the form of residence time distribution (RTD) curves and visualization of particular types of liquid steel flow distribution zones in the investigated tundish.