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Wave propagation in 3D anisotropic media with cubic symmetry
Červ, Jan
Harmonic wave propagation in an anisotropic medium with cubic symmetry is studied in the paper. First of all, the general relation for phase velocities and polarizations vectors of qL and qT waves having wave vectors in planes {1 0 0} have been derived. For a general direction of wave vector in turns out that the best way to get the solution is numerical solution based on Matlab.
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Když dobrá shoda nestačí
Okrouhlík, Miloslav
Paper deals with assessment of accuracy, credibility and reliability of results obtained by analytical, experimental and numerical methods within the scope of computational mechanics.
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Rudolf Brepta – his life, work and people around him
Okrouhlík, Miloslav
The paper is devoted to life of Rudolf Brepta and to his scientific achievements. A survey of his investigation deeds, dedicated to propagation of stress waves in solids, is presented as well as contributions of his colleagues and co-workers. The analytical methods he used are briefly sketched out and a few typical results are shown
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Parallel algorithm of modified Newmark's method in dynamics of rotors
Musil, Tomáš ; Jakl, Ondřej
Parallel algorithm of modified Newmark's method is used in dynamics of rotors supported by finite length journal bearings. The algorithm, realized in the MATLAB parallel computing environment (DCT/DCE), was tested on two different types of parallel computers – a Beowulf cluster and symmetric multiprocessor. Tests revealed good scalability and efficiency of proposed algorithm.
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Efect of loading force at aerodynamic
Půst, Ladislav ; Kozánek, Jan
The aerodynamic bearings belong among modern elements of high-speed rotation machinery. Particularly in chemical and food industry, as it excludes the undesirable damage of products by oil. The theoretical solution of bearing dynamic characteristics, including motion of tilting pads, is not yet completely elaborated. This contribution completed the works done in project GACR by a study of influence of loading on dynamic properties and motion of journal at unbalance excitation. Differential equations of motion of the rotor are derived, numerically solved and time histories of journal motion and their plane trajectories are presented.
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