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Dynamics of Machines 2011
Pešek, Luděk
The aim of the Colloquium was to facilitate the exchange of up to date information and knowledge among specialists in solid mechanics. The main attention was focused on: continuum dynamics, impact and non-linear phenomena, crack propagation, constitutive models, dynamics of linear and non-linear systems, identification, chaos, vibrations, interaction of mechanical systems and fluids, modern computational mechanics and experiments.
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Dynamics of three twisted blades with inter-slip couplings
Pešek, Luděk
Three-dimensional FE modelling and dynamic analysis of three-twisted-blade bunch connected mutually in blade heads by the dynamic contact with friction. The bunch was numerically tested under two dynamic regimes, such as resonance run-up excitation and vibration decay after short resonance run-up. In the contribution the influence of the blade responses, contact states, damping ratios on excitation level and excitation regimes is discussed.
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Various types of dry friction characteristics
Půst, Ladislav ; Pešek, Luděk
The dry friction processes is described by a general Coulomb friction law with respecting of micro-slips at the very low velocity, difference between static and dynamic coefficients, etc. For numerical calculation it is suitable to replace strongly nonlinear function by an equivalent linear damping coefficient.
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Further application of parametric anti-resonance
Tondl, A. ; Půst, Ladislav
This contribution completes the series of work oriented on active reduction of unacceptable vibrations by means of parametric excitation fulfilling certain conditions. It is shown that this phenomenon can be used not only for suppression of selfexcited vibrations or parametric resonances, but also of nonlinear resonances arising outside the region of main resonances in the vicinity of eigenfrequencies as are subharmonic resonances.
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