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Wyświetlanie 1-15 z 581
Tytuł:
Static finite element analysis of lower limb
Autorzy:
Zach, L.
Konvickova, S.
Ruzicka, P.
Powiązania:
https://bibliotekanauki.pl/articles/285008.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
metoda elementów skończonych
kończyna dolna
endoprotezy
finite element method
lower limb
endoprostheses
Opis:
The paper deals with a simulation by means of finite method of a natural lower limb after a knee joint arthroplasty in a full extension. Our last static model serving as a starting point for our future dynamic analysis is presented now. Aside a total knee endoprosthesis Medin Modular provided by MedinOrthopedics, a.s., two long bones, femur and tibia were used. Compared with our former results, this model gives reduced stress and contact pressures values which were given by more realistic ankle and hip joint definition. Their distributions also correspond better the experimental findings.
Źródło:
Engineering of Biomaterials; 2007, 10, no. 63-64; 6-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of airfield flexible pavement
Autorzy:
Leonardi, G.
Powiązania:
https://bibliotekanauki.pl/articles/230966.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
uderzenie
metoda elementów skończonych
nawierzchnia lotniskowa
lądowanie samolotu
Abaqus
nawierzchnia elastyczna
impact
finite element method
airfield pavement
aircraft landing
ABAQUS
flexible pavement
Opis:
The paper presents a numerical study of an aircraft wheel impacting on a flexible landing surface. The proposed 3D model simulates the behaviour of flexible runway pavement during the landing phase. This model was implemented in a finite element code in order to investigate the impact of repeated cycles of loads on pavement response. In the model, a multi-layer pavement structure was considered. In addition, the asphalt layer (HMA) was assumed to follow a viscoelastoplastic behaviour. The results demonstrate the capability of the model in predicting the permanent deformation distribution in the asphalt layer.
Źródło:
Archives of Civil Engineering; 2014, 60, 3; 323-334
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An initially deformed flat frame finite element
Autorzy:
Zamorowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/230223.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deformacja początkowa
rama płaska
nieliniowość geometryczna
przemieszczenie duże
obrót duży
obrót mały
metoda elementów skończonych
initial deformation
flat frame
geometrical nonlinearity
large displacements
large rotation
small rotation
finite element method
Opis:
The paper presents the author’s non-linear FEM solution of an initially stressless deformed flat frame element, in which the nodes are situated along the axis of the bar initially straight. It has been assumed that each node may sustain arbitrary displacements and rotation. The solution takes into account the effect of shear, the geometrical non-linearity with large displacements (Green-Lagrange’s strain tensor) and moderate rotations (i.e. such ones which allow a linear-elastic behaviour of the material) and alternative small rotations when the second Piola-Kirchhoff stress tensor is applied. This solution is based on [1], concerning beams without any initial bow imperfections. The convergence of the obtained results at different numbers of nodes and Gauss points in the element was tested basing on the example of circular arcs with a central angle of 120º-180º. The analysis concerned elements with two, three, five, seven, nine and eleven nodes, for the same number of points of numerical integration and also with one more or less. Moreover, the effect of distributing the load on the convergence of the results was analyzed.
Źródło:
Archives of Civil Engineering; 2013, 59, 3; 381-400
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of plate on layered tensionless foundation
Autorzy:
Buczkowski, R.
Torbacki, W.
Powiązania:
https://bibliotekanauki.pl/articles/230700.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metoda elementów skończonych
podłoże wielowarstwowe
płyta gruba
podłoże jednostronne
finite element method
layered foundation
thick plate
unilateral conditions
Mindlin element
Mindlin plate element
Opis:
The method of calculations of a thick plate on the two-parameter layered foundation by the finite element method is presented. The numerical model allows to add a few (number of) foundation layers. The expressions for the element stiffness matrices of the foundation are based on IS-node zero-thickness interface elements. For modeIling of thick plates the 9-node Mindlin element of the Lagrange family is used. The formulation of the problem takes into account the shear deformation of the plate and unilateral contact conditions between plate and foundation. The tensionless character of the foundation is achieved by removing from the global stiffness matrix the appropriate part of foundation stiffness attached to the node being in the separation stage. The advantages of the proposed algorithm are illustrated by numerical examples.
W pracy zaprezentowano obliczenia za pomocą metody elementów skończonych płyty grubej spoczywającej na dwuparametrowym podłożu wielowarstwowym. Model numeryczny pozwala na dodanie dowolnej liczby warstw podłoża. Wyrażenia na obliczenie macierzy sztywności podłoża bazują na wykorzystaniu l8-węzłowego międzypowierzchniowego elementu kontaktowego o zerowej grubości. W celu zamodelowania elementu płyty grubej wykorzystano 9-węzłowy element płytowy z rodziny Lagrange'a zdefiniowany według teorii Mindlina. Sformułowanie uwzględnia zarówno wpływ naprężeń ścinających w płycie jak również warunki kontaktu jednostronnego pomiędzy płytą a podłożem. Warunki kontaktu jednostronnego są zrealizowane przez usunięcie odpowiedniej części macierzy sztywności podłoża, która przypisana jest do węzłów nie będących w kontakcie. Poprawność zaproponowanego algorytmu zilustrowano kilkoma przykładmi numerycznymi.
Źródło:
Archives of Civil Engineering; 2010, 56, 3; 255-274
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-time finite element simulations on an arm microcontroller
Autorzy:
Mucha, W.
Powiązania:
https://bibliotekanauki.pl/articles/122615.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
finite element method
real time
embedded systems
microcontroller
metoda elementów skończonych
mikrokontroler
systemy wbudowane
Opis:
Real time processing enables online reactions to dynamic environment changes. The author focuses on possibilities of implementing the Finite Element Method (FEM) to real time algorithms on microcontrollers. The paper presents the current state of the Real Time Finite Element Method (RTFEM) and describes results obtained by the author. The RTFEM for microcontrollers (with examples of use cases) is presented and results of the computations for the chosen platform are given. The results consider optimization of RTFEM computational algorithms for a microcontroller taking into account their execution time. All the tests were performed on the ARM-CortexM4F based STM32F429ZIT6 microcontroller. The obtained results were compared, discussed and presented in the paper.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 1; 109-116
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Headframe modelling accuracy for finite element method analysis purposes
Autorzy:
Biel, D.
Lipecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/106857.pdf
Data publikacji:
2018
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
3D modelling
TLS
terrestrial laser scanner
headgear
headframe
finite element method
modelowanie 3D
skaner laserowy
wieża szybowa
wieża wyciągowa
metoda elementów skończonych
Opis:
Nowadays, the growing popularity of terrestrial laser scanners (TLS) allows to obtain a point cloud of many industrial objects along with classic surveying. However, the quality and model’s accuracy in comparison to a real shape seem to be a question, that must be further researched. It is crucial especially for Finite Element Method (FEM) analysis, which, being a part of technical design, estimate the values of construction’s dislocation and deformation. The article describes objects such as headgear with steel support and 4-post headframe with steel sheers. Both supports and sheers were modelled basing on point clouds. All the models were compared to the point cloud. The differences in models’ shape were calculated and the maximal values were determined. The results’ usefulness in FEM analysis was described.
Źródło:
Reports on Geodesy and Geoinformatics; 2018, 106; 19-24
2391-8365
2391-8152
Pojawia się w:
Reports on Geodesy and Geoinformatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A sign preserving mixed finite element approximation for contact problems
Autorzy:
Hild, P.
Powiązania:
https://bibliotekanauki.pl/articles/907565.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nierówność wariacyjna
zagadnienie kontaktowe
metoda elementów skończonych
variational inequality
positive operator
averaging operator
contact problem
Signorini problem
mixed finite element method
Opis:
This paper is concerned with the frictionless unilateral contact problem (i.e., a Signorini problem with the elasticity operator). We consider a mixed finite element method in which the unknowns are the displacement field and the contact pressure. The particularity of the method is that it furnishes a normal displacement field and a contact pressure satisfying the sign conditions of the continuous problem. The a priori error analysis of the method is closely linked with the study of a specific positivity preserving operator of averaging type which differs from the one of Chen and Nochetto. We show that this method is convergent and satisfies the same a priori error estimates as the standard approach in which the approximated contact pressure satisfies only a weak sign condition. Finally we perform some computations to illustrate and compare the sign preserving method with the standard approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 487-498
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using a graph grammar system in the finite element method
Autorzy:
Strug, B.
Paszyńska, A.
Paszyński, M.
Grabska, E.
Powiązania:
https://bibliotekanauki.pl/articles/330662.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
graph grammar system
automatic hp adaptivity
finite element method
gramatyka grafowa
adaptacja automatyczna
metoda elementów skończonych
Opis:
The paper presents a system of Composite Graph Grammars (CGGs)modelling adaptive two dimensional hp Finite Element Method (hp-FEM) algorithms with rectangular finite elements. A computational mesh is represented by a composite graph. The operations performed over the mesh are defined by the graph grammar rules. The CGG system contains different graph grammars defining different kinds of rules of mesh transformations. These grammars allow one to generate the initial mesh, assign values to element nodes and perform h- and p-adaptations. The CGG system is illustrated with an example from the domain of geophysics.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 4; 839-853
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element based prediction of deformation in sheet metal forming process
Autorzy:
Kraska, Damian
Trzepieciński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/117993.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
deep drawing
finite element method
sheet metal forming
głębokie rysowanie
metoda elementów skończonych
formowanie blachy
Opis:
In this paper the sheet forming process of cylindrical drawpieces was sim-ulated based on the finite element method by the explicit approach in the pres-ence of contact conditions with isotropic and anisotropic friction. The ex-perimental and numerical results obtained in the Abaqus finite element (FE) based program are presented. The aim of the experimental study is to analyse material behaviour under deformation and in addition to use the results to verify numerical simulation results. It was found that, although, the anisotropy of resistance to friction affects the height of ears, the influence of the friction formulation is relatively small in comparison with material anisotropy. The study indicates that FE analysis with 3-node triangular shell element S3R elements ensures the best approximation of the numerical results to the real process when both material and friction anisotropy are taken into account.
Źródło:
Applied Computer Science; 2018, 14, 3; 43-53
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical validation of the Finite Element Method model for Laplace equation
Autorzy:
Węgrzyn-Skrzypczak, Ewa
Skrzypczak, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/122738.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
Laplace equation
Fourier’s method
Finite Element Method
równanie Laplace'a
metoda Fouriera
metoda elementów skończonych
Opis:
The presented paper is focused on the comparison of the numerical solution of the Laplace equation in a two-dimensional space with the results obtained with the use of the analytical method. The results of the numerical model are computed on the base of the Finite Element Method. The analytical solution of the considered equation is obtained using the Fourier series. Finally the results of both methods are compared in order to verify the accuracy of numerical implementation.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 3; 97-106
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arbitrary high-order finite element schemes and high-order mass lumping
Autorzy:
Jund, S.
Salmon, S.
Powiązania:
https://bibliotekanauki.pl/articles/929704.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równanie falowe
metoda elementów skończonych
twierdzenie Cauchy'ego-Kowalevskiego
wave equation
finite element method
mass lumping
Cauchy-Kowalewski procedure
Opis:
Computers are becoming sufficiently powerful to permit to numerically solve problems such as the wave equation with high-order methods. In this article we will consider Lagrange finite elements of order k and show how it is possible to automatically generate the mass and stiffness matrices of any order with the help of symbolic computation software. We compare two high-order time discretizations: an explicit one using a Taylor expansion in time (a Cauchy-Kowalewski procedure) and an implicit Runge-Kutta scheme. We also construct in a systematic way a high-order quadrature which is optimal in terms of the number of points, which enables the use of mass lumping, up to P5 elements. We compare computational time and effort for several codes which are of high order in time and space and study their respective properties.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2007, 17, 3; 375-393
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical effectiveness of different formulations of the rigid finite element method
Autorzy:
Adamiec-Wójcik, I.
Drąg, Ł.
Wojciech, S.
Powiązania:
https://bibliotekanauki.pl/articles/955258.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda elementów skończonych
analiza dynamiczna
manipulatory
flexibility of links
rigid finite element method
dynamic analysis
nonlinear motions
numerical effectiveness
Opis:
The paper presents an application of different formulations of the rigid finite element method (RFEM) to dynamic analysis of flexible beams. We discuss numerical effectiveness of the classical RFEM and an alternative approach in which continuity of displacements is preserved by means of constraint equations. The analysis is carried out for a benchmark problem of the spin-up motion in planar and spatial cases. Torsion is omitted for numerical simulations and two cases of the new approach are considered. The results obtained by means of these methods are compared with the results obtained using a nonlinear two-node superelement.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 3; 475-485
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of temperature distribution in axisymmetric model of disc brake
Autorzy:
Grześ, P.
Powiązania:
https://bibliotekanauki.pl/articles/386492.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
metoda elementów skończonych
MES (metoda elementów skończonych)
rozkład temperatury
hamowanie
finite element method
FEM
temperature distribution
braking
Opis:
A transient thermal analysis is developed to examine temperature expansion in the disc and pad volume under simulated operation conditions of single braking process. This complex problem of frictional heating has been studied using finite element method (FEM). The Galerkin algorithm was used to discretize the parabolic heat transfer equation for the disc and pad. FE model of disc/pad system heating with respect to constant thermo-physical properties of materials and coefficient of friction was performed. The frictional heating phenomena with special reference to contact conditions was investigated. An axisymmetric model was used due to the proportional relation between the intensity of heat flux perpendicular to the contact surfaces and the rate of heat transfer. The time related temperature distributions in axial and radial directions are pre- sented. Evolution of the angular velocity and the contact pressure during braking was assumed to be nonlinear. Presented transient finite element analysis facilitates to determine temperature expansion in special conditions of thermal contact in axisymmetric model.
Źródło:
Acta Mechanica et Automatica; 2010, 4, 4; 23-28
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental studies and finite element simulation of ultrasonic welding of Cu alloy
Autorzy:
Mohan-Raj, N.
Kumaraswamidhas, L. A.
Arungalai-Vendan, S.
Powiązania:
https://bibliotekanauki.pl/articles/199854.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic
wire
Cu alloys
finite element method
ultradźwięk
drut
stopy Cu
metoda elementów skończonych
Opis:
This research study aims to investigate the mechanical and metallographical aspects of ultrasonic welding of Cu-Cu wires. Experimental trials have been conducted and observations have been recorded as a database that collates parametric, quality and strength aspects of various weldments. Destructive testing and metallurgical characterizations have been carried out to examine the strength and integrity of the weldment. The key focus of this research attempt is laid on determining and evaluating the factors that governs the strength of the weldment. Metallurgical characterizations reveal vital information on the weld integrity and the extent of grain distribution. Further, FEM is employed to understand the deformation and thermal aspects involved in Cu-Cu welding using ultrasonics. The numerical model may provide an insight into the thermal phenomenon governing the joining process and subsequently estimation of the impact. Response surface methodology is employed to identify the parametric interdependencies and subsequently determine the optimized range.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 535-546
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat conduction in TG laminate tolerance modeling and the finite element method
Autorzy:
Radzikowska, A.
Ostrowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/362621.pdf
Data publikacji:
2010
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
przewodzenie ciepła
funkcjonalne stopniowanie laminatu
tolerancyjne modelowanie
metoda elementów skończonych
heat conduction
functionally graded laminate
tolerance modelling
finite element method
Opis:
In this paper a problem of heat conduction in the laminate is investigated. The laminate is made of two conductors, non-periodically distributed as micro laminas along one direction. A macrostructure of such laminate is assumed to be functionally graded along this direction. In order to analyse the heat conduction, two modelling methods are applied: the tolerance averaging technique and the finite element method. The first approach is based on the book edited by Cz. Woźniak, Michalak and Jędrysiak [6], the second one is used in the numerical system ABAQUS. The results of applying both methods are compared for two different cases of the distribution of the conductors.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2010, T. 5, nr 3, 3; 49-52
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 581

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