Search results for: TRAUMA, NUMERICAL MODEL, FINITE ELEMENT METHOD, BLUNT FORCE TRAUMA, EYEBALL RUPTURE, EYE PROTECTION

• Mechanical model of fascia-implant structure. Finite element simulation.

  Publication

  • I. Lubowiecka

  - Year 2012

  Praca dotyczy modelowania i symulacji syntetycznych implantów chirurgicznych stosowanych w leczeniu przepulin brzusznych metodą laparoskowpową. Prponowane są modele matematyczne a ich prawidłowość weryfikowana jest na podstawie badań doświadczalnych zachowania się modeli fizycznych wszczepionych implantów pod wpływem obciążeń wynikających z fizjologii człowieka. Nakreślona jest metodologia oceny trwałości połączenia siatki chirurgicznej...

• Combined numerical and experimental approach to determine numerical model of abdominal scaffold

  Publication

  • A. Tomaszewska
  • D. Reznikov

  - COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING - Year 2022

  A proper junction of the prosthesis and the abdominal wall is important in successful hernia repair. The number of tacks should be balanced to assure appropriate mesh fixation and not to induce post-operative pain. Numerical simulations help to find this balance. The study is aimed at creating a proper numerical model of a knitted surgical mesh subjected to boundary conditions and load occurring in the abdominal cavity. Continuous,...

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• Discussion on “Coupled effective stress analysis of insertion problems in geotechnics with the Particle Finite Element Method” by L. Monforte, M. Arroyo, J.M. Carbonell, and A. Gens

  Publication

  • J. Konkol
  • L. Bałachowski

  - COMPUTERS AND GEOTECHNICS - Year 2019

  Addressed here is the Particle Finite Element Method (PFEM) modelling of undrained CPTu penetration with regard to a reference analytical solution based on the Spherical Cavity Expansion Method (SCEM). Also discussed is the choice of the soil model and its parameters. The effect of cone interface friction on CPTu simulation is analyzed in a series of penetration tests using Arbitrary Lagrangian-Eulerian (ALE) and Updated Lagrangian...

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• An optimal form of the finite element mass matrix in the analysis of longitudinal vibrations of rods

  Publication

  • M. Palacz
  • M. Krawczuk

  - FINITE ELEMENTS IN ANALYSIS AND DESIGN - Year 2022

  In this paper, an attempt is made to find the optimal form of the mass matrix of a rod finite element, which allows one to obtain the smallest errors in the longitudinal frequency determination of natural vibrations of any boundary conditions within the whole range of determined frequencies. It is assumed that the mass matrix can be treated as a linear combination of the consistent and diagonal matrices. Based on analytical considerations,...

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• An Efficient Framework For Fast Computer Aided Design of Microwave Circuits Based on the Higher-Order 3D Finite-Element Method

  Publication

  • A. Lamęcki
  • Ł. Balewski
  • M. Mrozowski

  - RADIOENGINEERING - Year 2014

  In this paper, an efficient computational framework for the full-wave design by optimization of complex microwave passive devices, such as antennas, filters, and multiplexers, is described. The framework consists of a computational engine, a 3D object modeler, and a graphical user interface. The computational engine, which is based on a finite element method with curvilinear higher-order tetrahedral elements, is coupled with built-in...

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• Finite element/mode-matching analysis of ferrite/dielectric line junctions of arbitrary cross-section

  Publication

  • A. Kusiek

  - JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS - Year 2018

  This paper is focused on the analysis of line junctions obtained as a cascade of dielectric and ferrite guides of arbitrary cross-section. The main application of such structures is nonreciprocal devices such as isolators, circulators, or phase shifters. The efficient finite element/mode-matching approach is proposed to the analysis of such structures. In this approach, thefiniteelementmethod is applied todetermine propagation...

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• An isogeometric finite element formulation for frictionless contact of Cosserat rods with unconstrained directors

  Publication

  • M. Choi
  • S. Klinkel
  • R. Sauer

  - COMPUTATIONAL MECHANICS - Year 2022

  This paper presents an isogeometric finite element formulation for nonlinear beams with impenetrability constraints, based on the kinematics of Cosserat rods with unconstrained directors. The beam cross-sectional deformation is represented by director vectors of an arbitrary order. For the frictionless lateral beam-to-beam contact, a surface-to-surface contact algorithm combined with an active set strategy and a penalty method...

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• GPU-Accelerated Finite-Element Matrix Generation for Lossless, Lossy, and Tensor Media [EM Programmer's Notebook]

  Publication

  • A. Dziekoński
  • P. Sypek
  • A. Lamęcki
  • M. Mrozowski

  - IEEE ANTENNAS AND PROPAGATION MAGAZINE - Year 2014

  This paper presents an optimization approach for limiting memory requirements and enhancing the performance of GPU-accelerated finite-element matrix generation applied in the implementation of the higher-order finite-element method (FEM). It emphasizes the details of the implementation of the matrix-generation algorithm for the simulation of electromagnetic wave propagation in lossless, lossy, and tensor media. Moreover, the impact...

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• Data obtained by numerical simulation for X-ray focusing using a finite difference method

  Open Research Data

  open access

  • P. Wojda
  • G. Graff
  • S. Kshevetskii

  The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. For solving the problem for an electromagnetic wave, a finite-difference method is applied.

• Harmonic Vibrations of Nanosized Magnetoelectric Bodies with Coupled Surface and Interphase Effects: Mathematical Models and Finite Element Approaches

  Publication

  • V. Eremeev
  • A. Nasedkin

  - Year 2018

  The harmonic problems for piezomagnetoelectric nanosized bodies with taking into account the coupled damping and surface effects are considered on the base of the generalized Gurtin-Murdoch model. In the development of previous investigations, the coupled mechanical, electric and magnetic surface effects with surface inertial terms are introduced into the model. For a homogeneous model, the composite material is considered as homogeneous...

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• On the validation of the LS-DYNA Geo Metro numerical model

  Publication

  • D. Bruski
  • S. Burzyński
  • J. Chróścielewski
  • Ł. Pachocki
  • W. Witkowski

  - MATEC Web of Conferences - Year 2019

  The paper presents experiences gained during work with numerical model of Geo Metro vehicle used for simulations of crash tests with road safety barriers. Attention is drawn to the subject of tire/wheel breakage during collision events. Some methods for improvement of the model are presented in the paper. Several results for the normative vehicle numerical tests are introduced. Simulations were carried out using LS-DYNA finite...

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• Application of the finite element methods in long-term simulation of the multi-physics systems with large transient response differences

  Publication

  • E. Wittbrodt
  • M. Kahsin

  - Journal of KONES - Year 2008

  Application of the Finite Element Method (FEM) and the Multibody Dynamics Method allows analyzing of complex physical systems. Complexity of the system could be related both to the geometry and the physical description of phenomenon. The metod is the excellent tool for analyzing statics or dynamics of the mechanical systems, and permits tracking of Multi Body System (MBS) transient response for the long-term simulations and application...

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• Simulation of water flow in double -porosity soils on unstructured grids with the finite element method.

  Publication

  • K. Burzyński
  • A. Szymkiewicz

  - TASK Quarterly - Year 2007

  Rozważa sie model przepływu wody w gruntowym ośrodku o podwójnej porowatości. Model matematyczny uzyskano poprzez zastosowanie teorii homogenizacji zastosowanej do gruntów o bardzo dużej różnicy przepuszczalności.

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• Analysis of the Impact Resistance of Toecaps by the Finite Element Method: Preliminary Studies

  Publication

  • P. Kropidłowska
  • E. Irzmańska
  • Ł. Gołębiowski
  • M. Jurczyk-Kowalska
  • A. Boczkowska

  - International Journal of Environmental Research and Public Health - Year 2022

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• Analysis of unsteady pipe flow using the modified finite element method

  Publication

  • R. Szymkiewicz
  • M. Mitosek

  - Year 2005

  W pracy przedstawiono rozwiązanie równania przepływu nieustalonego zmodyfikowaną metodą elementów skończonych. Podejście to prowadzi do 6-punktowego schematu niejawnego z dwoma parametrami wagowymi. Analiza dokładności wykonana metodą równania zmodyfikowanego wykazała, że zaproponowany schemat zapewnia wyższą dokładność rozwiązania niż inne schematy. Porównanie wyników obliczeń z wynikami eksperymentu fizycznego wskazuje, że ich...

• Modal energy identification of large stucture idealised by the finite element method

  Publication

  • K. J. Kaliński
  • M. A. Von

  - Year 2002

  Przedstawiono metodę określania energii drgań układów dyskretnych otrzyma-nych w wyniku modelowania metodą elementów skończonych wybranych fragmentów konstrukcji samochodów. W odróżnieniu od poprzednio stosowanych podejść, ro-zważa się całkowite energie mechaniczne odpowiadające poszczególnym posta-ciom drgań własnych. Całkowitą energię mechaniczną oblicza się na podstawie parametrów modelu modalnego. Energię mechaniczną można...

• Numerical Methods

  e-Learning Courses

  • P. Sypek
  • M. Rewieński

  Numerical Methods: for Electronics and Telecommunications students, Master's level, semester 1 Instructor: Michał Rewieński, Piotr Sypek Course description: This course provides an introduction to computational techniques for the simulation and modeling of a broad range of engineering and physical systems. Concepts and methods discussed are widely illustrated by various applications including modeling of integrated circuits,...

• An isogeometric finite element formulation for geometrically exact Timoshenko beams with extensible directors

  Publication

  • M. Choi
  • R. Sauer
  • S. Klinkel

  - COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING - Year 2021

  An isogeometric finite element formulation for geometrically and materially nonlinear Timoshenko beams is presented, which incorporates in-plane deformation of the cross-section described by two extensible director vectors. Since those directors belong to the space R3, a configuration can be additively updated. The developed formulation allows direct application of nonlinear three-dimensional constitutive equations without zero...

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• Efficient Finite Element Analysis of Axially Symmetrical Waveguides and Waveguide Discontinuities

  Publication

  • M. Warecka
  • R. Lech
  • P. Kowalczyk

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Year 2019

  A combination of the body-of-revolution and finite element methods is adopted for full-wave analysis of waveguides and waveguide discontinuities involving angular field variation. Such an approach is highly efficient and much more flexible than analytical techniques. The method is performed in two different cases: utilizing a generalized impedance matrix to determine the scattering parameters of a single waveguide section and utilizing...

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• Spectral Finite Element Method for Propagation of Elastic Waves in Wind Turbine Blades for SHM

  Publication

  • A. Żak
  • M. Krawczuk
  • W. Ostachwoicz

  - Year 2012

  W pracy przedstawiono model łopaty turbiny wiatrowej zbudowany z wykorzystaniem spektralnych elementów skończonych. Omówiono wyniki symulacji propagacji fal sprężystych i ich interakcji z uszkodzeniami w formie pęknięcia i delaminacji.

• Reduced model of gyroscopic system

  Publication

  • C. Orlikowski
  • R. Hein

  - Year 2008

  The paper presents the method of model reduction for the system with gyroscopic interactions. Two methods were used to obtain the approximate discrete models of the continuous structure: the modal decomposition method and the rigid finite element method. The first approach is used for this part of a system for which it is easy to formulate orthogonality conditions, meanwhile the second one is used for other part. The method enables...

• Changes of color coordinates of biological tissue with superficial skin damage due to mechanical trauma

  Publication

  • V. Petruk
  • O. Mokanyuk
  • O. Kvaternuk
  • L. Yakenina
  • A. Kotyra
  • R. Romaniuk
  • S. Dussembayeva
  • R. S. Romaniuk

  - Year 2015

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• Pediatric trauma and emergency surgery: an international cross-sectional survey among WSES members

  Publication

  • M. Reichert
  • M. Sartelli
  • I. Askevold
  • J. Braun
  • M. Weigand
  • M. Hecker
  • V. Agnoletti
  • F. Coccolini
  • F. Catena
  • W. Padberg... and 109 others

  - World Journal of Emergency Surgery - Year 2023

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• Diversity and ethics in trauma and acute care surgery teams: results from an international survey

  Publication

  • L. Cobianchi
  • F. Dal
  • M. Massaro
  • W. Biffl
  • F. Catena
  • F. Coccolini
  • B. Dionigi
  • P. Dionigi
  • S. Di
  • P. Fugazzola... and 273 others

  - World Journal of Emergency Surgery - Year 2022

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• Four-node semi-EAS element in six-field nonlineartheory of shells

  Publication

  • J. Chróścielewski
  • W. Witkowski

  - INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING - Year 2006

  W pracy sformułowano 4-węzłowy powłokowy element skończony dla konstrukcji powłokowych. Element opracowano w ramach nieliniowej 6-parametrowej teorii powłok z niesymetrycznymi miarami odkształceń membranowych. Kinematyka powłoki jest opisana przez dwa pola: translacji i obrotów, przy czym wszystkie trzy parametry obrotu traktowane są jako niezależne. W wyniku tego sformułowany element nadaje się do analizy struktur powłokowych...

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• Determinants of the primary stability of cementless acetabular cup implants: A 3D finite element study

  Publication

  • K. Immel
  • V. Nguyen
  • A. Dubory
  • C. Flouzat-Lachaniette
  • R. Sauer
  • G. Haiat

  - COMPUTERS IN BIOLOGY AND MEDICINE - Year 2021

  Primary stability of cementless implants is crucial for the surgical success and long–term stability. However, primary stability is difficult to quantify in vivo and the biomechanical phenomena occurring during the press–fit insertion of an acetabular cup (AC) implant are still poorly understood. The aim of this study is to investigate the influence of the cortical and trabecular bone Young's moduli Ec and Et, the interference...

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• Modelling of Longitudinal Elastic Wave Propagation in a Steel Rod Using the Discrete Element Method

  Publication

  • M. Knak
  • M. Nitka
  • E. Wojtczak
  • M. Rucka

  - Materials - Year 2022

  The paper deals with the issue of modelling elastic wave propagation using the discrete element method (DEM). The case of a longitudinal wave in a rod with a circular cross-section was considered. A novel, complex algorithm consisting of the preparation of models and simulation of elastic waves was developed. A series of DEM models were prepared for simulations, differing in discretisation and material parameters. Additional calculations...

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• A constitutive model for concrete based on continuum theory with non-local softening coupled with eXtended Finite Element Method. Computational Modelling of Concrete Structures,

  Publication

  • J. Bobiński
  • J. Tejchman

  - Year 2014

  Artykuł omawia model połączony ciągły-nieciągły do modelowania stref lokalizacji i rys w betonie niezbrojonym. Obliczenia wykonano stosując rozszerzoną metodę elementów skończonych. Wyniki numeryczne porównano z doświadczeniami.

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• Communication and Load Balancing Optimization for Finite Element Electromagnetic Simulations Using Multi-GPU Workstation

  Publication

  • A. Dziekoński
  • P. Sypek
  • A. Lamęcki
  • M. Mrozowski

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Year 2017

  This paper considers a method for accelerating finite-element simulations of electromagnetic problems on a workstation using graphics processing units (GPUs). The focus is on finite-element formulations using higher order elements and tetrahedral meshes that lead to sparse matrices too large to be dealt with on a typical workstation using direct methods. We discuss the problem of rapid matrix generation and assembly, as well as...

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• Improved finite element method for flow, heat and solute transport of Prandtl liquid via heated plate

  Publication

  • M. B. Hafeez
  • M. Krawczuk
  • W. Jamshed
  • H. Kaneez
  • S. M. Hussain
  • E. S. M. T. El Din

  - Scientific Reports - Year 2022

  In the current study, a vertical, 3D-heated plate is used to replicate the generation of heat energy and concentration into Prandtl liquid. We discuss how Dufour and Soret theories relate to the equations for concentration and energy. In order to see how efectively particles, interact with heat and a solvent, hybrid nanoparticles are used. It does away with the phenomena of viscous dissipation and changing magnetic felds. The motivation...

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• The spectral finite element model for analysis of flexural–shear coupled wave propagation

  Publication

  • M. Palacz
  • M. Krawczuk
  • W. Ostachowicz

  - COMPOSITE STRUCTURES - Year 2005

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• A general isogeometric finite element formulation for rotation‐free shells with in‐plane bending of embedded fibers

  Publication

  • T. X. Duong
  • M. Itskov
  • R. Sauer

  - INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING - Year 2022

  This article presents a general, nonlinear isogeometric finite element formulation for rotation-free shells with embedded fibers that captures anisotropy in stretching, shearing, twisting, and bending - both in-plane and out-of-plane. These capabilities allow for the simulation of large sheets of heterogeneous and fibrous materials either with or without matrix, such as textiles, composites, and pantographic structures. The work...

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• Preconditioners with Low Memory Requirements for Higher-Order Finite-Element Method Applied to Solving Maxwell’s Equations on Multicore CPUs and GPUs

  Publication

  • A. Dziekoński
  • G. Fotyga
  • M. Mrozowski

  - IEEE Access - Year 2018

  This paper discusses two fast implementations of the conjugate gradient iterative method using a hierarchical multilevel preconditioner to solve the complex-valued, sparse systems obtained using the higher order finite-element method applied to the solution of the time-harmonic Maxwell equations. In the first implementation, denoted PCG-V, a classical V-cycle is applied and the system of equations on the lowest level is solved...

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• Nonlocal Vibration of Carbon/Boron-Nitride Nano-hetero-structure in Thermal and Magnetic Fields by means of Nonlinear Finite Element Method

  Publication

  • H. M. Sedighi
  • M. Malikan
  • A. Valipour
  • K. Kamil Żur

  - Journal of Machinery Manufacture and Reliability - Year 2020

  Hybrid nanotubes composed of carbon and boron-nitride nanotubes have manifested as innovative building blocks to exploit the exceptional features of both structures simultaneously. On the other hand, by mixing with other types of materials, the fabrication of relatively large nanotubes would be feasible in the case of macroscale applications. In the current article, a nonlinear finite element formulation is employed to deal with...

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• Journal of Trauma Nursing

  Journals

  ISSN: 1078-7496 , eISSN: 1932-3883

• Archives of Trauma Research

  Journals

  ISSN: 2251-953X , eISSN: 2251-9599

• Craniomaxillofacial Trauma & Reconstruction

  Journals

  ISSN: 1943-3875 , eISSN: 1943-3883

• Trauma und Berufskrankheit

  Journals

  ISSN: 1436-6274

• Trauma Case Reports

  Journals

  ISSN: 2352-6440

• Bulletin of Emergency and Trauma

  Journals

  ISSN: 2322-2522

• JOURNAL OF ORTHOPAEDIC TRAUMA

  Journals

  ISSN: 0890-5339 , eISSN: 1531-2291

• JOURNAL OF LOSS & TRAUMA

  Journals

  ISSN: 1532-5024 , eISSN: 1532-5032

• Journal of Trauma & Dissociation

  Journals

  ISSN: 1529-9732 , eISSN: 1529-9740

• Trauma Violence & Abuse

  Journals

  ISSN: 1524-8380 , eISSN: 1552-8324

• Nonlinear dynamic analysis of the pure “buckling” mechanism during blow-out trauma of the human orbit

  Publication

  • M. Zmuda
  • P. Kłosowski
  • A. Skorek
  • K. Żerdzicki
  • P. Lemski
  • M. Koberda

  - Scientific Reports - Year 2020

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• Custom-Made Antibiotic Cement Nails in Orthopaedic Trauma: Review of Outcomes, New Approaches, and Perspectives

  Publication

  • M. Wasko
  • R. Kaminski

  - Biomed Research International - Year 2015

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• Finite element method simulations of various cases of crash tests with N2/W4/A steel road barrier

  Publication

  • S. Burzyński
  • J. Chróścielewski
  • Ł. Pachocki

  - MATEC Web of Conferences - Year 2018

  The subject of this study is performance of N2/W4/A steel road safety barrier investigated in numerical simulations. System was checked under several types of initial conditions, which were assumed basing on the TB11 and TB32 normative crash tests. The main goal of present study is to investigate the relationship between initial conditions (angle and velocity) of the impact and the severity indices (associated to the vehicle occupant) during...

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• Czesław Kazimierz Szymczak prof. dr hab. inż.

  People

• BIOLOGICAL TRACE ELEMENT RESEARCH

  Journals

  ISSN: 0163-4984 , eISSN: 1559-0720

• Single and Dual-GPU Generalized Sparse Eigenvalue Solvers for Finding a Few Low-Order Resonances of a Microwave Cavity Using the Finite-Element Method

  Publication

  • A. Dziekoński
  • M. Mrozowski

  - RADIOENGINEERING - Year 2018

  This paper presents two fast generalized eigenvalue solvers for sparse symmetric matrices that arise when electromagnetic cavity resonances are investigated using the higher-order finite element method (FEM). To find a few loworder resonances, the locally optimal block preconditioned conjugate gradient (LOBPCG) algorithm with null-space deflation is applied. The computations are expedited by using one or two graphical processing...

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