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Journal of Theoretical and Applied Mechanics
2000 Vol. 38 nr 4 957-968
PL Modelowanie obróbki strumieniem wodnościernym metodą elementów skończonych. W artykule przedstawiono pierwsze podejście do modelowania obróbki strumieniem wodnościernym metodą elementów skończonych. Celem badań jest próba wyjaśnienia zjawisk występujących na styku ścierniwa i przedmiotu obrabianego.[...]
EN This paper presents a first attempt to model abrasive waterjet (AWJM) machining process using the powerful tool of the finite element method (FEM) in order to explain the abrasive particle-workpiece interaction. The new model takes into account precise representation of the constitutive behaviour of[...]
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Computer Methods in Materials Science
PL Artykuł prezentuje projekt systemu obiektowego hp adaptacyjnej metody elementów skończonych, przeznaczonego do rozwiązywania problemów wieloskalowych. Celem opisu aplikacji hp adaptacyjnej za pomocą paradygmatu obiektowego jest uproszczenie kodu źródłowego, umożliwienie wielokrotnego wykorzystywania[...]
EN This paper presents an object-oriented (O-O) project of the hp-adaptive Finite Element Method (hp-FEM) code, supporting multi-scale computations. The main goal of the O-O approach in hp-FEM is to simplify the code and make it reusable and easily extendable. Mesh implemented according to the Euler mo[...]
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Poznan University of Technology Academic Journals. Electrical Engineering
2007 No 55 7-15
EN This paper presents an analysis and test results for a squirrel cage induction motor. The calculations are based on the field-circuit model. The mathematical model and an algorithm for solving equations is taking into account the nonlinearity of the magnetic circuit and the skewed slots in the rotor[...]
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Computer Assisted Mechanics and Engineering Sciences
EN This paper presents the basis of an adaptive mesh refinement technique aimed at reducing a local error, i.e. the error in a local quantity, which is defined as the integral of a stress or a displacement in a given subregion. Two pairs of dual solutions, one corresponding to the applied load and the[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2000 Vol. 4, No 3 453-468
EN With regard to serviceability state deformations, diaphragm walls and slurry walls cause considerable soil deformations during trench construction. 3-dimensional finite element analyses are able to quantify these deformations. They are compared to measurements and to the results of simplified 2-dime[...]
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Engineering Transactions
EN The Finite Element Method solution to the torsion problem of a linearly elastic, homogenous, isotropic cylinder with a non-simply connected cross-section of variable wall thickness is presented. The computed displacement, warping, stress, strain and Mises invariant are shown for several shapes of th[...]
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Computer Assisted Mechanics and Engineering Sciences
1998 Vol. 5, nr 2 193-198
EN Local approach in fracture mechanics is based on the application of appropriate failure micromechanistic models to make predictions of fracture behaviour. The FEA of crack-tip and an associated post-processing routine is usually applied. Here should be noted the distinction between the cells of m[...]
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Przegląd Mechaniczny
2002 nr 1 36-41
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Computer Assisted Mechanics and Engineering Sciences
EN In this paper a practical procedure for the solution of really sized mixed problems, generating a continuous stress field (where appropriate) and having both the stress and displacement boundary conditions exactly satisfied, is described. The system matrix for the present formulation can be subdivid[...]
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Archives of Acoustics
EN Numerical methods are mostly used to predict the acoustic pressure inside duct systems. In this paper, the development of a numerical method based on the convected Helmholtz equation to compute the acoustic pressure inside an axisymmetric duct is presented. A validation of the proposed method was do[...]
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Journal of KONES
EN The problem of propagation of vibration waves in soil caused by passing trains and vehicles is an important issue for the assessment of their influence on environmental impacts and engineering structures such as bridges, viaducts, historic architecture and residential buildings. The issue is complex[...]
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Journal of KONES
EN Selection of proper mechanical characteristics of the padding material of the head rest, namely polyurethane foam, is particularly important in the design process of the vehicle seat head restraint. In the paper the code of numerical simulation of flexible polyurethane foam absorber response against[...]
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Journal of KONES
EN Metallic foams are currently being looked at as a new material for automobiles. The main goal of the use of metallic foams in vehicles is to increase sound dampening, reduce the weight of the automobile, and increase energy absorption in case of crashes, or in military applications, to combat the co[...]
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Computer Methods in Materials Science
2012 Vol. 12, No. 4 244--249
PL Efekt samorozgrzania, występujący w ośrodkach lepkosprężystych ze względu na dyssypację energii mechanicznej podczas obciążeń cyklicznych struktury i jej przemiany w ciepło, jest podstawowym problemem eksploatacji elementów wykonanych z kompozytów polimerowych. W niektórych szczególnych przypadkach [...]
EN The self-heating effect, occurred in the viscoelastic media due to the mechanical energy dissipation during cyclic loading of a structure and its transformation into heat, is one of crucial problems of operation of elements made of polymeric composites. In some special cases of loading parameters th[...]
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Journal of KONES
EN Composites structures are widely using in varied fields of industry, where it has to take into account changes of temperature or it is possibility of fire hazards. Heat transfer and fire conditions in composites are very often analysis issues nowadays. A large amount of research in area of modelling[...]
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Archives of Acoustics
EN In the paper the finite element simulations of the reduction of the noise inside the crane cage by piezoelectric actuators glued to chosen external walls is discussed. The whole cage structure and internal acoustic medium is modelled and piezoelectric elements are dispersed. The first two lower natu[...]
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Journal of Theoretical and Applied Mechanics
2012 Vol. 50 nr 2 609-626
PL W pracy omówiono problem odpadania kryształów diamentu od kompozytowej matrycy narzędzi do cięcia naturalnych kamieni. Zagadnienie sformułowano dwuwymiarowo, a do uzyskania wyników symulacji numerycznych wykorzystano metodę elementów skończonych. Zjawisko badano dla warunków liniowego sprężystego pę[...]
EN Diamond debonding in composite segments used in cutting of natural stones was investigated in this study. The finite element method was used for numerical solutions, and the problem was modelled as two dimensional. The problem was investigated under linear elastic fracture conditions. Stress intensi[...]
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Journal of Theoretical and Applied Mechanics
2012 Vol. 50 nr 3 785-796
PL W pracy przedyskutowano warunki matematyczne w ramach metody elementów skończonych dla niesprzecznie zlinearyzowanego zagadnienia własnego struktur sprężystych w celu określenia granicy statycznej stateczności tych struktur, gdy te poddane zostają wyboczeniu wstępnemu scharakteryzowanemu stałym udzi[...]
EN The consistently linearized eigenproblem is used to derive mathematical conditions in the frame of the Finite Element Method (FEM) for loss of static stability of elastic structures at prebuckling states characterized by a constant percentage bending energy of the strain energy in the prebuckling re[...]
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Journal of KONES
EN The scope of this work was the validation process of the numerical model of the Mi-24 helicopter tail boom and vertical stabilizer. In order to obtain a detailed geometry of the actual structure the sophisticated reversed engineering techniques were used. The measurement was performed using two sepa[...]
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Journal of Theoretical and Applied Mechanics
PL W artykule zaprezentowano wybrane zagadnienia dotyczące metodyki wykonywania analiz wytrzymałościowych wysięgników samojezdnych maszyn górniczych przy pomocy metody elementów skończonych. Przedstawiono zasady budowania modeli obliczeniowych. W pracy zaprezentowano przykłady liczbowe obejmujące anali[...]
EN The paper presents selected aspects of the strength analysis of the self- propelled tunnelling machine boom. The principles of creating calculation models for numerical simulations with use of the finite element method are given. The study also presents two ways of conducting numerical calculations [...]
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