Národní úložiště šedé literatury Nalezeno 7 záznamů.  Hledání trvalo 0.00 vteřin. 
Dynamics of a cantilever beam with piezoelectric sensor: Parameter identification
Cimrman, Robert ; Kolman, Radek ; Musil, Ladislav ; Kotek, Vojtěch ; Kylar, Jaromír
The piezoelectric materials are electroactive materials often applied for real-time sensing or structural health monitoring, both important research topics in dynamics. Mathematical models of such structures have to allow also for the external electrical circuits and contain several material parameters that need to be identified from experiments. We present a model of a simple experiment involving dynamics of a cantilever beam with an attached piezoelectric sensor excited by a suddenly removed weight. The external circuit can be taken into account as having either a finite or infinite resistance. We also outline the parameter identification procedure based on automatic differentiation and present the experimental and numerical results.
Dynamics of a cantilever beam with piezoelectric sensor: Finite element modeling
Cimrman, Robert ; Kolman, Radek ; Musil, Ladislav ; Kotek, Vojtěch ; Kylar, Jaromír
An elastodynamical model of a cantilever beam coupled with a piezoelectric sensor is introduced and its discretization using the finite element method is presented. The mathematical model includes additional terms that enforce the floating potential boundary condition for keeping a constant charge on an electrode of the sensor. The behaviour of the model is illustrated using a numerical example corresponding to an experimental setup, where vibrations of the beam and the potential on the sensor are measured.
Charakterizace mikrovlnného surfatronu sondovou diagnostikou
SEZEMSKÝ, Petr
Cílem práce je analýza a vyhodnocení sondových charakteristik s použitím k tomu určenému software. Data jsou získána pomocí Langmuirovy sondy umístěné v nízkoteplotním plazmatu generovaného mikrovlnným surfatronem.