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Dynamics of Machines 2010
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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Nonlinear damping in rotating disk
Půst, Ladislav ; Pešek, Luděk
Paper is concerned with the steady state flexural vibrations of imperfect bladed circular disk by analytical and numerical solutions. Disk imperfection results from additional two groups of damping heads fixed on opposite ends of one diameter, which introduces point imperfections in mass, stiffness and nonlinear damping The main aim of this study is to investigate influence of friction damping among adding bladed heads on decrease of resonance amplitudes. Examples based on application of equivalent linearized damping show the properties of such dampers.
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Contactless Measuring Method of Blade Vibration during Increasing Turbine Operational Speed
Procházka, Pavel ; Vaněk, František ; Cibulka, Jan ; Bula, Vítězslav
A novel method for contactless measurements of turbine blade vibration during increasing or decreasing operational speed is presented. The method is based on the evaluation the time differences of blade tips passing along contactless sensors placed on the stator, and the substitution data correction using a numerical model. The method has been verified both numerically and experimentally. For the experimental research on the model bladed wheel of the Institute of Thermomechanics and subsequent applications in operating conditions, two new types of sensors functioning on the magnetoresistive and induction principle have been developed.
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