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The effect of geometrical dispersion on stress wave propagation
Hora, Petr
The effect geometrical dispersion is that the energy in a wave-packet propagates at different speeds depending on its frequency. It is shown that duration of a wave-packet increases linearly with propagation distance and also that the duration of a wave-packet after a given propagation distance depends on the input signal. Some conclusions are made concerning the Lamb wave propagation in a steel plate.
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Dynamic analysis of turbine blade M4
Hendrych, Pavel ; Pešek, Luděk ; Vaněk, František
This contribution is aimed at the numerical dynamic analysis of steam turbine low-pressure blade M4 both in steady state and under rotation. The verification of the free-free numerical model based on the modal analysis was carried out. The numerical model was developed as a three-dimensional finite element model. The Cambell diagram was calculated with respect to stress stiffening and spin softening effects.
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Scanning and saving graphic date
Dobiáš, Jan
Important experiences about graphic data scanning, processing and savin are discussed. The optimal approach to mass experimental graphic data processing and graphic document filling and retrieval is presented.
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Programme for research results use in practice
Dobiáš, Ivan
The S4P (Science for Practice) Programme of the Engineering Academy of the CR concentrates on new research knowledge transfer into industry and applications. Beside the research information system the S4P programme also includes other activities of the EACR.
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Dynamics of machines 2002
Dobiáš, Ivan
Cílem Koloquia je umožnit výmět výměnu nejnovějších informací a znalostí mezi odborníky na mechaniku tuhých těles. Hlavní důraz bude kladen na: dynamiku kontinua, impakt a nelineární jevy, šíření trhlin, konstitutivní modely, dynamiku lineárních a nelineárních systémů, identifikaci, chaos, kmitání, iterace mechanických systemů a tekutin, moderní počítačovou mechaniku a experimenty.
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Response curves of vibroimpact system
Půst, Ladislav ; Peterka, František
Dynamical properties of 1DOF mechanical system impacting on soft stop are studied at excitation by harmonic force. Soft stop is of Hertzs type with viscous damping. Properties of system are analyzed by means of response curves obtained by simulation of motion at slow variation of excitation frequency. Response curves are completed by phase plane trajectories at selected frequencies and time history record. The influences of clearance in system on the response curves, type and level of oscillations are presented. This paper is in narrow connection with contribution [1], where the regions of various type of oscillations of the same system are analyzed.
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