Národní úložiště šedé literatury Nalezeno 462 záznamů.  začátekpředchozí441 - 450dalšíkonec  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Structure estimation for systems described by radial basis functions based on normalized QR filtering
Kadlec, Jiří
The recursive algorithm for the estimation of the variable radial base structure based on the QA algorithm with the exponential forgetting, is presented for the radial-bases regression model in the parallel QA implementations. The algorithm is suitable also for the concurrent estimation of the model structure. It allows a highly modular implementation convenient for the parallel computation, what makes it suitable for the fast on line implementation in the area of nonlinear beame forming, etc.
Dynamické a stabilitní vlastnosti aeroelastického modelu
Horáček, Jaromír ; Kozánek, Jan ; Veselý, Jan
Příspěvek se zabývá měřením frekvenčně modálních a tlumicích vlastností aeroelastického modelu navrženého pro experimenty v aerodynamickém tunelu. Na základě experimentální modální analýzy jsou identifikovány matice tuhosti, tlumení a hmotnosti systému. Hranice stability, tj. kritické rychlosti flutteru byly měřeny v aerodynamickém tunelu.
Identification of antiresonances with the help of reciprocal technique
Kozánek, Jan ; Taupin, V.
The antiresonances can be very sensitive to some perturbations of the system and can be used in diagnostics and for the amelioration of the robustness of the control systems with respect to parameter variations. A simple identification technique showing how to determine the antiresonances (including some numerical results) is presented in this paper.
Identification of tram wheel with vibro-dissipation layer
Pešek, Luděk ; Veselý, Jan ; Podruh, J.
The wheels as vibration transformation elements and noise emitters substantially contribute to the total noise level of riding vehicle. We aimed at investigation of dynamic behavior of railway tram wheel with a special construction. This wheel has a rim separated from disk by rubber cushioning. The selected dynamic parameters of the wheel are modal, frequency and damping characteristics. Proportional damping was implemented into rubber layer of FE wheel model as the first approximation of dissipation behavior.
Time-domain identification of non-linear reological models in a sandwich mechanical system
Pešek, Luděk ; Veselý, Jan
The vibration control by passive damping of dissipation layers is considered. The methods for mathematical description and parameter identification of weakly non-linear dissipation behavior of rubber layers in time domain are designed.
Book of Abstracts - Identification and Updating Methods of Mechanical Structures EUROMECH 437
Kozánek, Jan ; Poppová, Lenka
The development of FEM from both theoretical and practical point of view increases the necessity to verify and improve their mathematical models.
Design of aerodynamic Tilting-pad journal bearings and corresponding dynamical experiments
Šimek, J. ; Kozánek, Jan ; Šafr, M.
In this paper the design of aerodynamic tilting-pad journal bearings is presented and corresponding dynamical experiments are proposed. The experimental test stand with HF electric motor will be built at Institute of Thermomechanics, Czech Academy of Sciences, Prague. The rotor and pad vibrations will be measured. The vibrational data analysis will enable spectral and moda lidentification of this rotor-bearings system.

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