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Nové směry vývoje v experimentálních metodách ve spojení s numerickým modelováním
Jírová, Jitka
The bilateral symposia have a long tradition and are organized on the basis of the agreement between DFG and AS CR every two year. They bring together selected scientists, who are actively involved in experimental and numerical solid mechanics, theoretically and practically, in order to exchange experience, to report on the present state-of-art as well as on running research projects, to discuss due questions and problems and to promote the co-operation between individuals as well as between institutions.
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Provozní parametry a charakteristiky aktuátorů s dilatačním prvkem
Doležel, Ivo ; Karban, P. ; Ulrych, B. ; Barglik, J. ; Pantelyat, M. ; Matyukhin, Y. ; Gontarowskiy, P.
In specific applications one needs actuators characterized by very high forces at small shifts. As actuators of classical constructions mostly cannot satisfy these requirements, the authors designed another arrangement with an inductively heated dilatation element. But huge mechanical strains and stresses of thermoelastic origin acting in its structural parts could lead to its damage or destruction. The paper deals with mathematical modeling of the device that is solved numerically in the combined formulation (while the electromagnetic field is solved independently, the thermal and thermoelastic effects are solved in the hard-coupled formulation). The algorithm is illustrated on a typical example whose results are discussed.
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Integrální výpočet magnetického pole stíněného trojfázového vedení
Karban, P. ; Doležel, Ivo ; Ulrych, B.
The paper deals with numerical modeling of a three-phase harmonic-current carrying shielded line. In most similar cases, computation of magnetic field and other associated quantities is realized using the finite element method that is effective, reliable and the results obtained correspond to the physical reality. Nevertheless, the method may become problematic when particular subre-gions (conductors, insulation, shielding elements) are geometrically incommensurable, which is even the case of thin shielding shells. That is why the authors use the integral approach for modeling of the relevant effects. Presented is its basic continuous mathematical model that is solved numerically. The theoretical analysis is supplemented with a typical example.
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Solution of Interaction of Viscous Incompressible Fluid with Elastically Mounted Body using ALE-method
Damašek, Alexandr ; Burda, P.
We deal with twodimensional problem of vibrations of valve plug of steam turbine induced by flow of viscous incompressible fluid. Fluid is described using Navier-Stokes equations and continuity equation. For the body of the valve plug large displacements and rotations are considered. We take into account moving geometry of the fluid domain in time. Numerical solution of the problem of interaction is based on ALE-method which enables independent description of the fluid domain and elastically supported body. For spatial discretization of the fluid domain finite element method is used.
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