Wydział Mechaniczny / Faculty of Mechanical Engineering / W1

Stały URI zbioruhttp://hdl.handle.net/11652/1

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2006 - 200912010 - 20166

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Tematsearch.filters.applied.operator.equals: search.filters.subject.symulacja numeryczna

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Teraz wyświetlane 1 - 7 z 7
  • Pozycja
    Numerical Model of CAI Test for Fibre-Reinforced Polymer Plate.
    (Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Baszczyński, Piotr; Dziomdziora, Sebastian; Naze, Rafał; Kubiak, Tomasz
    This article presents numerical simulations of laminates subjected to Compression After Impact (CAI) testing including delamination modelling. Different model of impact damages of laminate were considered. Progressive damage analysis have been employed and different failure criteria have been applied. For each simulation failure load has been estimated as same as the position of damages at destroyed layer. Finally, obtained numerical results were compared with experimental data from referential paper.
  • Pozycja
    Comparision of Numerical Results with Known Solutions of Buckling Problem of Pressured Shallow Spherical Shells.
    (Lodz University of Technology. Faculty of Mechanical Engineering. Department Division of Dynamics., 2016) Lykhachova, Olga; Kołakowski, Zbigniew
    Buckling problem of pressured shallow spherical shells is studied numerically for two types of finite elements: axisymmetric and non–axisymmetric. A very good correspondence of obtained results and known solutions is revealed in the case of clamed and hinged spherical segments for both types of finite elements. The comparison of results also shows that using non–axisymmetric finite element lets one get full pre– and post–buckling equilibrium path in the range of relative deflections w=h.
  • Pozycja
    Dynamic response of plate under temperature field pulse.
    (Wydział Mechaniczny. Katedra Wytrzymałości Materiałów i Konstrukcji. Politechnika Łódzka, 2015) Czechowski, L.
    The work dealt with the numerical simulation of functionally graded plate under thermal pulse loading. It was stated that the great influence on the plate response had the distribution index, the duration and the kind of the temperature rise.
  • Pozycja
    Vibration Analysis of Collecting Electrodes by means of the Hybrid Finite Element Method
    (2014) Adamiec-Wójcik, Iwona; Awrejcewicz, Jan; Nowak, Andrzej; Wojciech, S.
    The paper presents a hybrid finite element method of shell modeling in order to model collecting electrodes of electrostatic precipitators. The method uses the finite element method to reflect elastic features and the rigid finite element method in order to model mass features of the body. A model of dust removal systems of an electrostatic precipitator is presented. The system consists of two beams which are modeled by means of the rigid finite element method and a system of collecting shells modeled by means of the hybrid finite element method. The paper discusses both the procedure of deriving the equations of motion and the results of numerical simulations carried out in order to analyze vibrations of the whole system. Experimental verification of the model is also presented.
  • Pozycja
    Modelling damage processes of concrete at high temperature with thermodynamics of multi-phase porous media.
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2006) Gawin, Dariusz; Pesavento, Francesco; Schrefler, Bernhard A.
    In this paper, the authors present a mathematical description of a multi-phase model of concrete based on the second law of thermodynamics. Exploitation of this law allowed researchers to obtain definitions and constitutive relationships for several important physical quantities, like capillary pressure, disjoining pressure, effective stress, considering also the effect of thin films of water. A mathematical model of hygro-thermo-chemo-mechanical phenomena in heated concrete, treated as a multi-phase porous material, has been formulated. Shrinkage strains were determined using thermodynamic relationships via capillary pressure and area fraction coefficients, while thermo-chemical strains were related to thermo-chemical damage. In the model, a classical thermal creep formulation has been modified and introduced into the model. Results of numerical simulations based on experimental tests carried out at NIST laboratories for two types of concrete confirmed the usefulness of the model in the prediction of the time range, during which the effect of concrete spalling may occur.
  • Pozycja
    Application of artificial neural networks in parametrical investigations of the energy flow and synchronization.
    (Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej, 2010) Dąbrowski, Artur; Jach, Anna; Kapitaniak, Tomasz
    Dynamics of nonlinear systems is a very complicated problem with many aspects to be recognized. Numerous methods are used to investigate such systems. Their careful analysis is connected with long-time simulations. Thus, there is great need for methods that would simplify these processes. In the paper, an application of Artificial Neural Networks (ANNs) supporting the recognition of the energy flow and the synchronization with use of Impact Maps is introduced. This connection applies an idea of the Energy Vector Space in the system with impacts. An energy flow direction change with the synchronization as a transitional state is shown. A new type of the index allowing one to control the system dynamic state is introduced. Results of the numerical simulations are used in the neural network teaching process. Results of a comparison of the straight impact map simulation and the neural network prediction are shown. Prediction of system parameters for the energy flow synchronization state with use of the neural network is presented.
  • Pozycja
    Stan naprężenia w elastomerze zawierającym cząstki ferromagnetyczne w polu magnetycznym.
    (Stowarzyszenie Inżynierów i Techników Mechaników Polskich, 2010) Boczkowska, Anna; Czechowski, Leszek; Jaroniek, Mieczysław; Niezgoda, Tadeusz
    Przedstawiono wyniki analizy modelowania metodą elementów skończonych oraz badań metodą elastooptyki magnetoreologicznego elastomeru w obecności pola magnetycznego. Celem przeprowadzonych symulacji numerycznych i badań eksperymentalnych było uzyskanie wiedzy o wzajemnym oddziaływaniu elastomeru i kulek żelaza (wyznaczenie wartości odkształcenia i naprężenia) oraz zdobycie doświadczenia niezbędnego do modelowania takich oddziaływań na poziomie mikrostruktury w rzeczywistym elastomerze zawierającym cząstki żelaza o wymiarach mikronowych.