Temat: Finite Elements Method - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis and monitoring of electrical grounding grid encapsulated with concrete: case study using simulation in finite element method
Autorzy:: Pereira, T. M.
Lima, R.
Gomes, V. M.
Calixto, W. P.
Alves, A. J.
Powiązania:: https://bibliotekanauki.pl/articles/136184.pdf
Data publikacji:: 2017
Wydawca:: EEEIC International Barbara Leonowicz Szabłowska
Tematy:: grounding systems
finite elements method
Opis:: This work study the influence of concrete, plaster, clay and others buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons on different grounding systems. The study includes comparison of six different grounding system on dry season and wet season. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest.
Źródło:: Transactions on Environment and Electrical Engineering; 2017, 2, 2; 31-36
2450-5730
Pojawia się w:: Transactions on Environment and Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical analysis of temperature influence on deformation and effort of bimetallic element
Autorzy:: Panowicz, R.
Kucewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/241699.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite elements method
bimetallic elements
thermoelasticity
Opis:: Bimetallic elements consist of at least two, connected together, material layers. The materials have different coefficients of thermal expansion. An active layer of bimetallic elements has a greater thermal expansion coefficient, whereas a passive layer has a lower one. Therefore, deformation of bimetallic elements occurs due to a change in temperature. The simplest case of bimetallic elements is a strip, which bends in the shape of an arc. As a consequence of elements deformation, stresses appear in them. An important problem is optimization of each layer of the element to achieve certain characteristics of the system. The elements should work in an elastic domain in the entire operating range. The aim of the paper is to present both numerical and analytical results for three different bimetallic elements. The following pairs of materials are considered: invar – incoloy, steel – brass and aluminium – molybdenum subjected to uniform heating. An influence of temperature and active layer dimensions of the sample on deformation and stresses of each layer was developed. It was found that the stress value is close to zero, on the boundary of each layer, for characteristic deflections of the considered bimetallic elements. The results of numerical analyses were compared with a theoretical solution presented by Timoshenko. Numerical analyses were performed using the Finite Element Method implemented in the commercial software LS-Dyna.
Źródło:: Journal of KONES; 2016, 23, 3; 389-394
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: An analysis on the effect of crosscuts within shaft protective pillars on deformations of the surrounding rock mass deformations
Autorzy:: Warchala, Ewa
Szostak-Chrzanowski, Anna
Powiązania:: https://bibliotekanauki.pl/articles/1402313.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: finite elements method
stress
protective pillar
deformation
Opis:: The development of crosscuts within mining shafts’ protective pillars causes a change of state of stress in the surrounding rock mass. It also causes deformations of the rock mass and the surface. It is essential to conduct prediction analysis of the deformations and stresses in order to secure a proper functioning of a shaft located within the protective pillar. It is recommended that the analysis should be based on the integration of the finite element method (FEM) and geodetic monitoring results. FEM makes it possible to determine the rock mass stresses and displacements in the shaft protective pillars and in the surrounding rock mass. It makes is possible to determine the safety and proper functioning of the shaft. The results of the FEM analysis of the impact of crosscuts and mining activities on rock mass deformations inside and on the surface of the protective shaft pillar are presented. The influence of mining extractions was investigated. The mining panels were located around the safety pillar in three regions NW, SE and SW and the crosscut were located within the safety pillar. The presented methodology will allow for the determination of the deformations and strains in case of farther development of crosscuts within the protective shaft pilar and by planned mining activities around the pillar.
Źródło:: Mining Science; 2020, 27; 253-265
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analysis of the detonation initiation point position influence on the cylindrical fragmentation warhead effectiveness
Autorzy:: Panowicz, R.
Konarzewski, M.
Trypolin, M.
Powiązania:: https://bibliotekanauki.pl/articles/243709.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite elements method
dynamics
directed fragmentation warheads
Opis:: The article presents results of the numerical analyses of the fragmentation warhead, which is one of the key elements of the missile used to combat anti-tank missiles. The fragmentation warhead is composed of such elements as outer casing, inner casing, explosive material and fragmentation liner. The fragmentation liner is built from steel spheres or cylinders embedded in epoxy resin. As a result of the explosive material detonation the pressure wave is generated, which affects the liner, causes its fragmentation, and drives each splinter. In order to perform numerical analyses the model of the cylindrical fragmentation warhead with a diameter of 80 millimetres and a length of 100 mm was prepared. The fragmentation liner consists of steel spheres with a diameter of 5 mm. It was assumed in simulation that the detonating material is the plastic explosive C4. The influence of the position of the explosive charge detonation initiation point of the fragmentation warhead on its effectiveness was studied. Effectiveness was evaluated by measuring the maximum speed obtained by the fragments and their spatial distribution. A three-dimensional model of the studied system has been prepared using the MSC Patran software and the numerical analyses were performed using the finite element method with explicit scheme of the time integration implemented in the LS-Dyna solver. To model gas domain Arbitrary Lagrangian-Eulerian (ALE) method was used and interaction between gas and solid body was modelled with FSI coupling.
Źródło:: Journal of KONES; 2016, 23, 1; 263-270
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Evaluation of impact of the deflector shape on effectiveness of weakening the blast wave originating from a mine or IED
Autorzy:: Panowicz, R.
Nowak, J.
Konarzewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/244439.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite elements method
simulation
military vehicles
deflector
Opis:: The situations which our forces faced during various stabilization military missions showed that light armored vehicles are not secure enough in the case of the mine or improvised explosive devices explosion. Nowadays, the primary way of protection against this type of threat is application of a V-shape bottom in the vehicle. Such a configuration of the bottom allows dissipation of explosion energy whereby the impulse, which is transmitted to the construction – the vehicle bottom or frame, has a much lower value than in the case where the bottom is flat. In the literature it is possible to find the results of model tests on an experimental laboratory test stand. These studies show that the value of the impulse which is transmitted to the structure depends on the shape of the deflector, actually on its angle. Assuming the above condition, there were performed numerical analyses of the values of the impulse transmitted to the construction for deflectors with different angles and for a variety of loads masses. The aim of the numerical analyses was to find the optimal angle of the deflector for the considered situation. In this model, the optimal value of the angle is that in which the considered value of the impulse transmitted to the construction reaches the minimum value. For this purpose, there was made a finite element model of deflector corresponding to the conditions of the experiment. The shell elements were used in this model. The model was loaded with a pressure impulse derived from the detonation of an explosive. The blast wave interaction with the structure was modeled using the fluid structure interaction. The numerical analyses were based on the finite element method with the explicit time integration method implemented in the LS-DYNA program.
Źródło:: Journal of KONES; 2013, 20, 2; 329-334
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Profesor Olgierd Cecil Zienkiewicz – sylwetka wybitnego inżyniera
Professor Olgierd Cecil Zienkiewicz – a distinguished engineer
Autorzy:: Fórmaniak, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/1939498.pdf
Data publikacji:: 2019
Wydawca:: Polski Uniwersytet na Obczyźnie w Londynie
Tematy:: Olgierd Cecil Zienkiewicz
engineering
Finite Elements Method
Opis:: The article discusses both private and professional life of prof. Olgierd Cecil Zienkiewicz who spent most of his life in England. He was a distinguished engineer, specialising in designing and building huge architectural constructions. What brought him international recognition, however, was his creation of Finite Elements Method, which found its practical use. The method enables the simulation of a design issue in the computer memory without the necessity to build an actual prototype, which greatly facilitates the design process.
Źródło:: Zeszyty Naukowe PUNO; 2019; 215-223
2052-319X
Pojawia się w:: Zeszyty Naukowe PUNO
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical analysis of a shell with a main shaped charge warhead stroke into a bar armour with square section
Autorzy:: Niezgoda, T.
Panowicz, R.
Sybilski, K.
Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/247419.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mechanics
finite elements method
bar armor
RPG
Opis:: Recent operations of Polish troops within the framework of peacemaking missions' uncovered weak points of the equipment used there. It turned out that one of the most significant threats is a shell equipped with a main shaped charge warhead used by partisan detachments. These can break even 900mm of shell-proof steel so it is very difflcult to protect anything from the shells. One of the ways of protection from high explosive anti-tank (HEAT) warheads is using bar armours. This paper focuses on analysis of a shell with PG-7G main shaped charge warhead stroke into a bar armor with a square section. This work presents a short description of the analyzed object. Moreover, there is a principle of operation of a shell with the speciflcation of the most trouble elements from the point ofview of high velocity partial stream creation. In addition, the paper indicates steps of a numerical model construction together with geometry simplifications and initial-marginal conditions. On the basis of the results the researchers evaluated the extent of destruction of shell key elements. Furthermore, the work indicates drawings with deformed parts and presents stresses maps of these elements. The summary states to what extent PG-7G shell stroke into the armor made of bars with a square section influences reduction of operation efficacy of this type of firearm. Calculations were conducted in LS-Dyna system, which is used for oscillation analyses with a finite elements method. In order to solve the motion equation the researchers used an ordinary integration method used for i.e. analyses of highly non-linear oscillation phenomena.
Źródło:: Journal of KONES; 2010, 17, 3; 327-332
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Introduction to numerical analysis of directed fragmentation warheads
Autorzy:: Panowicz, R.
Nowak, J.
Konarzewski, M.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/243275.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite elements method
dynamic
directed fragmentation warheads
Opis:: The aim of the paper is to presents one of the possible approaches to the numerical analysis of the behaviour of directed fragmentation war heads. These kinds of warheads consists of: metallic or composite cover, explosive material and a driven and fragmentation liner. The explosives are initiated by a booster causes driving the liner in a few milliseconds up to about 900 m/s. The liner fragments into many parts during this intensive and dynamic load. The fragments move in a cone which dimensions depend on the warheads shape and mechanical parameters of others warheads parts. All of the warheads elements are selected to meet the assumed parameters. The fragments velocity, their mass or geometric dimensions and cone angle are the most important parameters of the warheads fragments. Such a warhead, in the initial phase of the liner driving can be numerically modelled in the field of the continuum damage mechanics. Such a description is presented in other papers. This approach in a further phase of driving cause the increases of inaccuracies. Therefore, this paper proposes the use of ALE and FSI approach to describe the behaviour of the fragmentation warheads. A three-dimensional numerical model of the directed fragmentation warheads was made in the MSC Patran, and the dynamic phenomena analysis used a nonlinear finite element method implemented in the LS-Dyna program.
Źródło:: Journal of KONES; 2013, 20, 4; 319-325
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Selected Methods of Obtaining Adequate Forms of Deformation of Supercritical Thin-Walled Flat Plates
Autorzy:: Kopecki, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2024021.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: finite elements method
nonlinear analysis
advanced deformation
isogrid
Opis:: The study includes considerations on the numerical methods of obtaining the correct forms of deformation of thin-walled plates subjected to pure shear, operating under conditions of critical loads. Selected methods were presented and subjected to comparative tests, allowing for the obtaining of a state of large deformations of a perfectly flat system, loaded in its plane. These methods are based on application various forms of initial imperfections into the system, either geometrically or physically. A new solution was proposed in this area, differing in its essence from most commonly used solutions.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 2; 184-190
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Adhesive bonded hot dip zinc coated sheet and titanium sheet joint strength - numerical analysis
Autorzy:: Rudawska, A.
Dębski, H.
Powiązania:: https://bibliotekanauki.pl/articles/248038.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adhesive joint
finite elements method (FEM)
adhesive joints strength
Opis:: This paper describes a numerical analysis of adhesively bonded hot dip zinc coated sheet and titanium sheet and its comparison with the results of experimental tests. The study aims at presenting a comparative analysis of numerical calculation results with the results of strength test of the joints in question. Numerical simulations are an invaluable extension of experimental tests and, moreover, prove particularly useful at joint designing and analysis stages. The calculations were conducted with ABAQUS Standard software and allowed for the destructive force value obtained in experimental tests. Strength tests were conducted on single-lap adhesive joints for given structural materials; the samples were shear-loaded. The comparison of the results of experimental tests and numerical analysis led us to observe certain inconsistencies in the destructive force values, consequently providing information on the accuracy of a numerical model when compared with the actual model. Geometric model of the analysed single-lap adhesive joint, numerical model of the analysed single-lap adhesive joint, adhesive layer failure criterion description, visualisation of the analysed single-lap joint failure process, visualisation of adhesive joint failure stages of adhesive layer are presented.
Źródło:: Journal of KONES; 2012, 19, 1; 339-345
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Influence of destructor case type on behaviour of fragments in military vehicles active protection system
Autorzy:: Nowak, J.
Panowicz, R.
Konarzewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/243721.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite elements method
simulation
military vehicles
directed fragmentation warheads
Opis:: Military vehicles active protection systems against cumulative missiles are designed to destroy the attacking missile before it hits the vehicle armour. The article presents the results of numerical studies of one of the elements of active protection system, which is the fragmentation destructor. A typical directed fragmentation warhead consists of a few parts: metallic or composite case, explosive material and fragmentation elements in the form of spheres, cylinders. The authors of this study evaluated the influence of the destructor case type – in particular material – on the effectiveness of the destructor. The effectiveness was evaluated on the basis of the maximum speed of balls. Evaluation was performed for the selected balls from each layer. Numerical calculations were performed for two materials of the case: steel and aluminum. It was assumed in simulation that the detonating material is the plastic explosive C4. The numerical analyses were based on the finite element method with the explicit time integration method implemented in the Ls-Dyna program. The interaction of solid and gaseous medium has been modelled using ALE coupling. Mechanical properties of the case were described using a simplified Johnson-Cook type material. The detonation process was described using programmed burn model approximations, and the behaviour of detonation products was described with the JWL (John, Wilkins, Lee) equation.
Źródło:: Journal of KONES; 2014, 21, 1; 183-187
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Modelowanie nacisku na powierzchni styku wargowego pierścienia uszczelniającego z wałem
Modelling the pressure on contact surface of sealing ring and shaft
Autorzy:: Grabka, L.
Markowicz, J.
Szweda, S.
Powiązania:: https://bibliotekanauki.pl/articles/199525.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniki Górniczej KOMAG
Tematy:: węzeł uszczelniający
metoda elementów skończonych
sealing ring
finite elements method
Opis:: W opracowaniu przedstawiono metodykę wyznaczania nacisku na powierzchni styku wargowego pierścienia uszczelniającego z wałem za pomocą metody elementów skończonych. Omówiono budowę modelu MES węzła uszczelniającego. Przedstawiono przykładowe wyniki analizy z uwzględnieniem stanu naprężenia spowodowanego montażem pierścienia uszczelniającego na wale, ciśnienia oleju oraz statusu elementów kontaktowych.
Methodology for determination of pressure on the contact surface of sealing ring with shaft using the Finite Elements Method (FEM) is presented. FEM model of the sealing node is discussed. Some results of analysis, including stress caused by installation of sealing ring on the shaft, oil pressure and status of contact elements, are given.
Źródło:: Maszyny Górnicze; 2013, 31, 4; 20-26
0209-3693
2450-9442
Pojawia się w:: Maszyny Górnicze
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Numerical analysis of impact load of arch yielding support
Autorzy:: Tokarczyk, J.
Turewicz, K.
Smolnik, G.
Rotkegel, M.
Powiązania:: https://bibliotekanauki.pl/articles/243887.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: virtual prototyping
finite elements method
mining
impact analysis
experimental test
Opis:: Bumping is one of the natural hazards that occur in Polish collieries. It is a common phenomenon but difficult to predict and very often it causes huge losses in mining equipment and roadway structure. Death of miners working underground is most severe result of bumping. To reduce or even to eliminate results of bumping, especially fatal cases, many safety measures have been used. Frame of arch support is one of the measures applied to reduce dangerous results of bumping. Simulation test ofimpact load of arch yielding support was presented in the paper. The simulation of support load was realized in two stages. Static load of frame of yielding arch support was simulated at the first stage. Among others simulation of assembly of arch support components was carried out. Non-linear simulation, including contact phenomena, was conducted for that purpose. First stage of the task was realized in MSC.Marc/Mentat software Structure of yielding arch support was dynamically loaded at the second stage. The forcing corresponded to real dynamic loads that werefound in mine workings. Second stage of the task was realized in MSC.Dytran software The results of simulations carried out at the KOMAG Institute of Mining Technology were compared with the results of tests of arch supports, which were realized at the Central Mining Institute.
Źródło:: Journal of KONES; 2010, 17, 1; 455-464
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Influence of the crack tip model on results of the finite elements method
Wpływ modelu wierzchołka pęknięcia na wyniki uzyskane metodą elementów skończonych
Autorzy:: Graba, M.
Gałkiewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/281432.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fracture mechanics
finite deformation
stress distribution
J integral
CTOD
finite elements method
Opis:: The paper contains recommendations of finite element models of the crack tip neighborhood to obtain results independent of the finite element mesh. The recommendations are valid for elastic-plastic problems and finite strains. As an example, analysis of single edge notched specimens under bending is presented.
W pracy przeprowadzono analizę wpływu modelu MES na wartość naprężeń przed frontem pęknięcia w materiałach sprężysto-plastycznych, wyznaczaną w sposób numeryczny wartość całki J oraz rozwarcie wierzchołka pęknięcia (RWP). Obliczenia prowadzono dla płaskiego stanu odkształcenia przy założeniu dużych odkształceń.
Źródło:: Journal of Theoretical and Applied Mechanics; 2007, 45, 2; 225-237
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Metoda pozycjonowania powierzchni stawowych w modelowaniu MES
A method for positioning the geometrical models of human joints in different positions
Autorzy:: Klekiel, T.
Powiązania:: https://bibliotekanauki.pl/articles/99017.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Śląska. Katedra Biomechatroniki
Tematy:: modelowanie
metoda Newtona
metoda elementów skończonych
modelling
Newton method
finite elements method
Opis:: Praca dotyczy opracowania metody przeznaczonej do pozycjonowania modeli geometrycznych kości na podstawie przyjętego obiektywnego kryterium. Zagadnienie zdefiniowano jako problem optymalizacyjny. Zastosowano metodę Newtona do pozycjonowania elementów kostnych stawu kolanowego dla dowolnego kąta zgięcia. Zaproponowano rozwiązanie umożliwiające ustalenie wzajemnego położenia powierzchni stawowych stawu kolanowego dla modeli geometrycznych kości udowej oraz piszczelowej pozyskanej z tomografii komputerowej dla wyprostowanej kończyny. Zastosowanie proponowanej metody umożliwia dokładne pozycjonowanie elementów bryłowych, dzięki czemu uzyskano wymagany kontakt powierzchni stawowych. Przedstawiona metoda umożliwia uzyskanie dokładnych modeli stawu dla dowolnych położeń.
This paper presents the method to preparation geometrical models in which the suitable position is required. The author applied the Newton algorithm to finding solution for nonlinear set of equations. These equations are prepared from general relations between independent coordinates. Application was realized in VBA language based on data received from model generated in ANSYS Inc. Software. The proposed method was examined for finding position problem for the fibula and tibia bones in knee joint for different angles during bending of knee. The error of solutions was determined as a mean distance between selected spaces. The results were compared on the space selected to represented the cartilage contact in the joint.
Źródło:: Aktualne Problemy Biomechaniki; 2017, 12; 41-50
1898-763X
Pojawia się w:: Aktualne Problemy Biomechaniki
Dostawca treści:: Biblioteka Nauki

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