PL
 |
EN
Ograniczanie wyników
Czasopisma help
  1. 3 Archives of Foundry Engineering
  2. 2 Biuletyn Wojskowej Akademii Technicznej
  3. 2 Bulletin of the Military University of Technology
  4. 2 Journal of KONES
  5. 2 Journal of Theoretical and Applied Mechanics
Więcej...
Autorzy help
  1. 4 Baranowski P.
  2. 4 Małachowski J.
  3. 2 Bohdal Ł.
  4. 2 Szewc K.
  5. 2 Wróblewski P.
Więcej...
Lata help
  1. 1 2023
  2. 2 2022
  3. 1 2021
  4. 3 2020
  5. 1 2018
Więcej...
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 26

Liczba wyników na stronie
first rewind previous Strona / 2 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  SPH
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 2 next fast forward last
1
The numerical techniques application in the ball mill comminution process modelling
Pawlos Witold, Dominiczak Przemysław
Cuprum : czasopismo naukowo-techniczne górnictwa rud
|
2023
|
nr 1-2
47--53
EN
The preliminary results of comminution process numerical simulations have been presented in this paper. The numerical prediction has been based on discrete elements method (DEM) for solid modelling and smoothed particles hydrodynamics method (SPH) for modelling a continuous medium – liquid. The one way numerical coupling between solid and liquid has been applied. The ball mill working in production line in O/ZWR has been modelled. The considered ball mill is used to copper ore comminution process. The numerical calculations have been carried out for different mill rotation speed.
PL
W artykule przedstawiono wstępne wyniki numerycznych symulacji procesu rozdrabniania. Prognozowanie numeryczne zostało oparte na metodzie elementów dyskretnych (DEM), wykorzystanej dla modelowania cząstek stałych, oraz na metodzie symulacji hydrodynamicznej (SPH) dla modelowania w ośrodku ciągłym – ciecz. Zastosowano jednokierunkowe sprzężenie numeryczne pomiędzy fazą stałą a ciekłą. Młyn kulowy, zainstalowany w ciągu technologicznym ZWR, został wytypowany jako obiekt modelowania. Rozpatrywany młyn pracuje jako urządzenie rozdrabniające rudę miedzi. Obliczenia numeryczne przeprowadzono dla różnych prędkości obrotowych młyna.
2
Content available Cutting force prediction of Ti6Al4V using a machine learning model of SPH orthogonal cutting process simulations
Klippel Hagen, Sanchez Eduardo Gonzalez, Isabel Margolis, Röthlin Matthias, Afrasiabi Mohamadreza, Michal Kuffa, Wegener Konrad
Journal of Machine Engineering
|
2022
|
Vol. 22, No. 1
111--123
EN
The prediction of machining processes is a challenging task and usually requires a large experimental basis. These experiments are time-consuming and require manufacturing and testing of different tool geometries at various process conditions to find optimum machining settings. In this paper, a machine learning model of the orthogonal cutting process of Ti6Al4V is proposed to predict the cutting and feed forces for a wide range of process conditions with regards to rake angle, clearance angle, cutting edge radius, feed and cutting speed. The model uses training data generated by virtual experiments, which are conducted using physical based simulations of the orthogonal cutting process with the smoothed particle hydrodynamics (SPH). The ML training set is composed of input parameters, and output process forces from 2500 instances of GPU accelerated SPH simulations. The resulting model provides fast process force predictions and can consider the cutter geometry in comparison to classical analytical approaches.
3
Content available Application of Smoothed Particle Hydrodynamics Method in Metal Processing: An Overview
Nguyen Trang Thi Thu, Hojny Marcin
Archives of Foundry Engineering
|
2022
|
Vol. 22, iss. 3
67--80
EN
Smoothed Particle Hydrodynamics (SPH) is a Lagrangian formula-based non-grid computational method for simulating fluid flows, solid deformation, and fluid structured systems. SPH is a method widely applied in many fields of science and engineering, especially in the field of materials science. It solves complex physical deformation and flow problems. This paper provides a basic overview of the application of the SPH method in metal processing. This is a very useful simulation method for reconstructing flow patterns, solidification, and predicting defects, limitations, or material destruction that occur during deformation. The main purpose of this review article is to give readers better understanding of the SPH method and show its strengths and weaknesses. Studying and promoting the advantages and overcoming the shortcomings of the SPH method will help making great strides in simulation modeling techniques. It can be effectively applied in training as well as for industrial purposes.
4
Content available Zastosowanie metod bezsiatkowych do modelowania pocisków pistoletowych
Kędzierski Piotr, Watorowska Julia
Biuletyn Wojskowej Akademii Technicznej
|
2021
|
Vol. 70, nr 2
89--99
PL
Artykuł przedstawia analizę możliwości zastosowania dwóch metod bezsiatkowych do modelowania pocisków pistoletowych na przykładzie pocisku 9 mm Parabellum. Badania obejmowały metody SPH (Smoothed Particle Hydrodynamics) oraz SPG (Smoothed Particle Galerkin). Wyniki symulacji komputerowych zostały porównane z wynikami testów balistycznych pod względem zgodności kształtowo-wymiarowej zdeformowanego pocisku. Błąd względny średnicy pocisku wynosił 15% i 17% odpowiednio dla metody SPG i SPH. Postać deformacji dla metody SPH odbiegała od wyników testów balistycznych, podczas gdy metoda SPG wiernie odwzorowała kształt zdeformowanego pocisku.
EN
The paper presents an analysis of applicability of two meshless methods for pistol bullets modelling based on an example of a 9 mm Parabellum. The studies included the following methods: smoothed Particle Hydrodynamics (SPH) method and smoothed Particle Galerkin (SPG) method. The results of computer simulations were confronted with ballistic test results in terms of shapedimensional compliance of the deformed projectile. The relative error of the projectile diameter was 15% and 17% for the SPG and SPH methods, respectively. The deformation form for the SPH method deviated from the ballistic test results, while the SPG method faithfully reproduced the shape of the deformed projectile.
5
Content available Numerical Investigation of an Explosive Welding of Ti/Cu Plates Based on a Meshfree Method
Mojżeszko M., Perzyński K., Sionkowski M., Paul H., Madej Ł.
Archives of Metallurgy and Materials
|
2020
|
Vol. 65, iss. 2
707--711
EN
Development of a reliable numerical model capturing major physical mechanisms controlling explosive welding and considering properties of all process components i.e. base plate and flyer plate is the goal of the paper. To properly replicate materials behavior under these severe conditions a meshfree approach, namely Smooth Particle Hydrodynamics (SPH), was used to discretize the computational domain. The model is based on the Mie-Gruneisen shock equation of state applied to the Ti/Cu system as a case study. Examples of results in the form of velocity, equivalent stress, equivalent strain, and pressure fields are presented within the paper.
6
Content available Analysis of Ballistic Resistance of Composites with EN AW-7075 Matrix Reinforced with Al2O3 Particles
Kurzawa A., Pyka A., Jamroziak K.
Archives of Foundry Engineering
|
2020
|
Vol. 20, iss. 1
73--78
EN
The paper presents the results of experimental-numerical tests of firing at aluminum composite materials. The test materials were manufactured by pressure infiltration of porous ceramic preforms made of α-Al2O3 particles in the amount of 30% and 40% by volume. The EN AW-7075 alloy was chosen as the material matrix, and the steel 7.62×39 mm (M 43) FMJ (Full Metal Jacket) intermediate ammunition was selected for firing. In the result of the experiment, the samples were perforated with a clear difference in the muzzle diameter. The projectile with fragments caused damage to up to three reference plates placed behind the samples (witness plates) in composites with 40% of particles by volume. The mechanics of crack propagation during ballistic impacts of the projectile was characterized based on microstructure studies. Then, using numerical analysis of impact load, the examination of composite materials puncture in the ABAQUS environment was carried out. The Finite Element Method (FEM) was employed for the discretization of geometric models using Hex elements. The Johnson-Cook constitutive model describing the relationship between stress and strain in metal-ceramic composites was applied for the analyses. Numerical models were then subjected to numerical verification using smoothed particle hydrodynamics (SPH). Based on the obtained results, it was found that the hybrid FEM/SPH method correlates significantly with the experimental results.
7
Content available A Sequential FEM-SPH Model of the Heating-Remelting-Cooling of Steel Samples in the Gleeble 3800 Thermo-Mechanical Simulator System
Hojny M.
Archives of Foundry Engineering
|
2020
|
Vol. 20, iss. 3
60--68
EN
This article presents a sequential model of the heating-remelting-cooling of steel samples based on the finite element method (FEM) and the smoothed particle hydrodynamics (SPH). The numerical implementation of the developed solution was completed as part of the original DEFFEM 3D package, being developed for over ten years, and is a dedicated tool to aid physical simulations performed with modern Gleeble thermo-mechanical simulators. Using the developed DEFFEM 3D software to aid physical simulations allows the number of costly tests to be minimized, and additional process information to be obtained, e.g. achieved local cooling rates at any point in the sample tested volume, or characteristics of temperature changes. The study was complemented by examples of simulation and experimental test results, indicating that the adopted model assumptions were correct. The developed solution is the basis for the development of DEFFEM 3D software aimed at developing a comprehensive numerical model allows the simulation of deformation of steel in semi solid state.
8
Content available Smoothed particle hydrodynamics modelling of the Rayleigh-Plateau instability
Olejnik M., Szewc K.
Journal of Theoretical and Applied Mechanics
|
2018
|
Vol. 56 nr 3
675--686
EN
The break-up of liquid ligaments and formation of droplets are elementary phenomena in multiphase flows which are of high importance in industrial and medical applications. From the numerical point of view, they require proper interface and surface tension treatment. In the present work, we apply Smoothed Particle Hydrodynamics, a meshless approach, to simulate the break-up of a liquid cylinder inside the gaseous phase, i.e. the Rayleigh-Plateau instability. Results obtained in 3D show that even a relatively coarse resolution allows one to predict correctly the size of droplets formed in the process. The detailed analysis of the break-up time in 2D setup implies that a certain level of spatial discretisation needs to be reached to determine this moment precisely.
9
Content available Application of a SPH coupled FEM method for simulation of trimming of aluminum autobody sheet
Bohdal Ł.
Acta Mechanica et Automatica
|
2016
|
Vol. 10, no. 1
56--61
EN
In this paper, the applications of mesh-free SPH (Smoothed Particle Hydrodynamics) continuum method to the simulation and analysis of trimming process is presented. In dealing with shearing simulations for example of blanking, piercing or slitting, existing literatures apply finite element method (FEM) to analysis of this processes. Presented in this work approach and its application to trimming of aluminum autobody sheet allows for a complex analysis of physical phenomena occurring during the process without significant deterioration in the quality of the finite element mesh during large deformation. This allows for accurate representation of the loss of cohesion of the material under the influence of cutting tools. An analysis of state of stress, strain and fracture mechanisms of the material is presented. In experimental studies, an advanced vision-based technology based on digital image correlation (DIC) for monitoring the cutting process is used.
10
Content available Modelowanie procesu wykrawania elementów pojazdów samochodowych za pomocą metody cząstek hydrodynamicznych
Bohdal Ł., Kukiełka L., Gontarz S., Gotowała K.
Autobusy : technika, eksploatacja, systemy transportowe
|
2015
|
R. 16, nr 6
37-40
PL
W artykule przedstawiono sposób modelowania procesu wykrawania elementów pojazdów samochodowych z wykorzystaniem metody cząstek hydrodynamicznych (SPH). Symulację komputerową opracowano z wykorzystaniem Solvera LS-DYNA oraz aplikacji LS-PrePost. Otrzymano mapy intensywności naprężeń i odkształceń dla dowolnej chwili czasowej z uwzględnieniem nieliniowości występujących w procesie. Przedstawiono wybrane wyniki analizy numerycznej, które mogą być wykorzystane do projektowania procesu i jego optymalizacji.
EN
The paper presents the modeling of the blanking process of the car elements using Smoothed Particle Hydrodynamics (SPH). Numerical analysis was performed in LS-DYNA solver and LS-PrePost application regarding process nonlinearities. Obtained maps of stresses, strains, displacement at any moment of time can be used to design of the process and it’s optimization.
11
Content available Smoothed particle hydrodynamics simulations using graphics processing units
Szewc K.
TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
|
2014
|
Vol. 18, No 1
67--80
EN
Smoothed Particle Hydrodynamics (SPH) is a fully Lagrangian, particle-based technique for fluid-flow modeling. As a gridless method, it appears to be a natural approach to simulate multi-phase flow with complex geometries. Since SPH involves a large set of short-range particle-particle interactions, numerical implementations present a high degree of spatial data locality and a significant number of independent computations. Therefore, the numerical code can be easily written in a massively parallel manner. The main purpose of this study is to discuss the issues related to the implementation of the SPH method for computation using Graphics Processing Units (GPU). The study is supported by two-dimensional validation cases: the lid-driven cavity and oscillation of a droplet. The obtained results show a good accuracy of the method, as well as, high numerical efficiency of its GPU implementation.
12
Content available Numerical simulation of crater creating process in dynamic replacement method by smooth particle hydrodynamics
Danilewicz A., Sikora Z.
Studia Geotechnica et Mechanica
|
2014
|
Vol. 36, nr 3
3--8
EN
A theoretical base of SPH method, including the governing equations, discussion of importance of the smoothing function length, contact formulation, boundary treatment and finally utilization in hydrocode simulations are presented. An application of SPH to a real case of large penetrations (crater creating) into the soil caused by falling mass in Dynamic Replacement Method is discussed. An influence of particles spacing on method accuracy is presented. An example calculated by LS-DYNA software is discussed. Chronological development of Smooth Particle Hydrodynamics is presented. Theoretical basics of SPH method stability and consistency in SPH formulation, artificial viscosity and boundary treatment are discussed. Time integration techniques with stability conditions, SPH+FEM coupling, constitutive equation and equation of state (EOS) are presented as well.
13
Content available Symulowanie topnienia lodu z wykorzystaniem procesorów graficznych
Domaradzki J., Chabko K., Martyn T.
Pomiary Automatyka Kontrola
|
2014
|
R. 60, nr 7
429--431
PL
W artykule przedstawiono metodę symulowania topnienia obiektów zbudowanych z lodu, implementowaną przy wykorzystaniu możliwości obliczeniowych nowoczesnych procesorów graficznych (GPU). Proces topnienia zrealizowano jako rezultat wymiany ciepła pomiędzy obiektami lodowymi i płynami (woda i powietrze), modelowanymi jako zbiory ruchomych cząstek o określonych parametrach fizycznych. Do obliczenia ruchu cząstek wykorzystano wariant algorytmu SPH. Zaprezentowano nowy cząstkowy model powietrza, który pozwala m.in. na uwzględnienie w symulacji lokalnych zmian temperatury powietrza w czasie. Otrzymywane wyniki symulacji są bardziej realistyczne z punktu widzenia poprawności fizycznej i końcowego efektu wizualnego, aniżeli rezultaty otrzymywane przy użyciu metod poprzednich.
EN
The paper presents a fast GPU-based approach to simulation of melting ice objects at interactive frame rates. Our main contribution is a new particlebased model of air which allows one to take into account in simulation the effects of local changes in the air temperature. The process of melting is realized as heat transfer between ice and fluids (water and air), which are represented by means of sets of movable particles (Fig. 2). To convert the triangle-mesh representation of solids into particles, we use a GPU-based voxelization method [4]. Each particle carries some physical local properties of fluid, and their evolution over time is described by the Navier-Stokes equation for incompressible fluids. In order to solve the equation, we utilize a modified version of Smoothed Particle Hydrodynamics (SPH) method [6]. Then, triangle meshes of solids are extracted from the particle representation using marching cubes algorithm, and visualized via ray tracing. Thanks to the new model of air, the results of ice melting supplied by our method (Fig. 3) are more realistic from the standpoint of physical correctness as well as visual appearance than those obtained with the previous approaches.
14
Numeryczne modelowanie zjawiska wybuchu
Ogierman W.
Modelowanie Inżynierskie
|
2014
|
T. 20, nr 51
62--69
PL
W artykule przedstawiono metodykę numerycznego modelowania zjawiska wybuchu przy użyciu metody elementów skończonych (MES) oraz bezsiatkowej metody SPH (Smoothed Particle Hydrodynamic). Zaprezentowano i porównano wyniki symulacji otrzymane wymienionymi metodami. Wartości ciśnienia fali uderzeniowej wyznaczone numerycznie zostały porównane z istniejącymi w literaturze zależnościami empirycznymi. Możliwości metod numerycznych w analizie zjawiska wybuchu przedstawiono na przykładzie analizy oddziaływania fali uderzeniowej na przykładową konstrukcję.
EN
This article presents methodology of numerical modeling of explosion phenomenon by using the finite element method (FEM) and meshless SPH (Smoothed Particle Hydrodynamic) method. Obtained simulations results are presented and compared. Computed numerically shock wave pressure values were compared with existing empirical solutions. Testing the influence of blast wave on the exemplary structure is presented as an example of capabilities of numerical methods in modeling of the explosion phenomenon.
15
Content available remote Modeling of ice phenomena in the mouth of the Vistula River
Kolerski T.
Acta Geophysica
|
2014
|
Vol. 62, no. 4
893--914
EN
The mouth of the Vistula River, which is a river outlet located in tideless area, is analyzed. The Vistula River mouth is a man-made, artificial channel which was built in the 19th century in order to prevent the formation of ice jams in the natural river delta. Since the artificial river outlet was constructed, no severe ice-related flood risk situations have ever occurred. However, periodic ice-related phenomena still have an impact on the river operation. In the paper, ice processes in the natural river delta are presented first to refer to the historical jams observed in the Vistula delta. Next, the calibrated mathematical model was applied to perform a series of simulations in the Vistula River mouth for winter storm condition to determine the effects of ice on the water level in the Vistula River and ice jam potential of the river outlet.
16
Content available The application of the smoothed particle hydrodynamice (SPH) method and the experimental verification of cutting of sheet metal bundles using a guillotine
Gąsiorek D.
Journal of Theoretical and Applied Mechanics
|
2013
|
Vol. 51 nr 4
1053--1065
EN
The article presents the application of the SPH method for the modeling of cutting composite bundles using a guillotine. For many years, the SPH method has been applied in the modeling of dynamic phenomena in which rapid strain and large deformations occur. The discrete model has been performed by combining the FEM and the SPH. The SPH method has only been applied for to the fragment in which the material separation during cutting appears. To verify the numerical results, experiments have been performed using a special test stand for the confirmation of the correctness of the developed model and the numerical simulations.
17
Content available Smoothed particle hydrodynamics versus finite element method for blast impact
Jankowiak T., Łodygowski T.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2013
|
Vol. 61, nr 1
111-121
EN
The paper considers the failure study of concrete structures loaded by the pressure wave due to detonation of an explosive material. In the paper two numerical methods are used and their efficiency and accuracy are compared. There are the Smoothed Particle Hydrodynamics (SPH) and the Finite Element Method (FEM). The numerical examples take into account the dynamic behaviour of concrete slab or a structure composed of two concrete slabs subjected to the blast impact coming from one side. The influence of reinforcement in the slab (1, 2 or 3 layers) is also presented and compared with a pure concrete one. The influence of mesh density for FEM and the influence of important parameters in SPH like a smoothing length or a particle distance on the quality of the results are discussed in the paper.
18
Content available Wybrane numeryczne metody modelowania obciążenia falą podmuchową podwozia pojazdu terenowego : analiza porównawcza
Baranowski P., Małachowski J.
Biuletyn Wojskowej Akademii Technicznej
|
2012
|
Vol. 61, nr 3
117-128
PL
Praca ta skupia się na przedstawieniu wyników badań dynamicznej odpowiedzi struktury gumowej na przykładzie koła pojazdu terenowego w warunkach oddziaływania fali podmuchowej. W analizowanym przykładzie wzięto pod uwagę układ zawieszenia wraz z uproszczonym podwoziem rozpatrywanego pojazdu. Mając na uwadze, że w pierwszej kolejności fala ciśnienia pochodząca od detonacji ładunku wybuchowego oddziałuje na oponę, autorzy postanowili odwzorować ten element w sposób jak najbardziej zbliżony do rzeczywistości. W związku z tym model MES podzielono na sześć odrębnych części oraz zaimplementowano do niego układ kordów, których konfiguracja oraz położenie zostały zweryfikowane przy użyciu mikroskopu oraz urządzenia rentgenowskiego. Tak utworzony układ koło-zawieszenie został poddany obciążeniu falą ciśnienia powstałą z eksplozji ładunku wybuchowego. Analizy numeryczne wykonane zostały przy użyciu kodu obliczeniowego LS-Dyna oraz dwóch dostępnych metod numerycznych umożliwiających realizację opisu procesu detonacji, tj. sprzężenia Lagrange-Euler (ALE) oraz metody Smoothed Particle Hydrodynamics (SPH). W drugiej części badań zbadano odpowiedź struktury gumowej (opony) na zadane dynamiczne obciążenie w postaci fali ciśnienia ze szczególnym zwróceniem uwagi na prędkość odkształceń oraz proces zniszczenia materiału. Dodatkowo porównano wyniki dla dwóch rodzajów ładunku wybuchowego: C4 oraz TNT.
EN
This paper focuses on a rubber structure behaviour assessment under dynamic loading on the example of a terrain suspension system subjected to pressure wave. Due to the fact that pressure wave interacts with the tire, in the first place, it was important to develop a discrete model of it as much similar to the real one as possible. Thus, numerical model of the tire was divided into six different parts with steel cords inside. The non-linear dynamic analyses were performed using the LSDYNA code. In order to simulate the blast wave propagation, the Smoothed Particle Hydrodynamics method and Arbitrary Lagrangian-Eulerian formulation with Jones Wilkins Lee equation defining the explosive material were used. In the second part of investigations, the rubber behaviour under dynamic loading with the strain rate effect and failure process taking into consideration was assessed and compared for TNT and C4 charge.
19
Content available Numerical implementation of meshless methods for beam problems
Rosca V. E., Leitao V. M. A.
Archives of Civil Engineering
|
2012
|
Vol. 58, nr 2
175-184
EN
For solving a partial different equation by a numerical method, a possible alternative may be either to use a mesh method or a meshless method. A flexible computational procedure for solving 1D linear elastic beam problems is presented that currently uses two forms of approximation function (moving least squares and kernel approximation functions) and two types of formulations, namely the weak form and collocation technique, respectively, to reproduce Element Free Galerkin (EFG) and Smooth Particle Hydrodynamics (SPH) meshless methods. The numerical implementation for beam problems of these two formulations is discussed and numerical tests are presented to illustrate the difference between the formulations.
20
Content available Numerical Aspects of Penetration Simulation
Morka A., Zduniak B., Niezgoda T.
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
|
2011
|
Vol. 2, Nr 3 (5)
21-30
EN
Several numerical methods were studied as means of solution to a penetration problem. The Element Free Galerkin (EFG), Smooth Particle Hydrodynamics (SPH), Finite Element Analysis (FEA) methods were considered. The above mentioned algorithms implemented in the LS-DYNA code were applied. Additionally, the mesh density was taken into consideration. The reference case assumed an average node to node distance of 1 mm. The finer and coarser mesh densities were analysed. The full 3D models of the projectile and target were developed with a strain rate and temperature dependent material constitutive relations. An impact of 12.7x108 mm B32 armour piercing projectile on a 80 mm thick block of 7017 aluminium alloy was modelled. The results obtained by a computer simulation were validated and then verified by experimental data. The study of the erosion criteria involves defining the most efficient and reliable way of removing the failed and extremely deformed parts of the projectile and targets. Generally, EFG method applied to solve the perforation/penetration problems can be characterized as a very stable, reliable and effective method.
first rewind previous Strona / 2 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.