National Repository of Grey Literature 45 records found  beginprevious32 - 41next  jump to record: Search took 0.01 seconds. 
Non-destructive Testing of Concrete Structures by Laser Vibrometry
Trnka, Jan ; Dvořáková, Pavla ; Veselý, Eduard
The reasearch report deals with non-destructive testing of concrete structures by Laser Vibrometry. The aim of the work was to find pros and cons of an application of laser vibrometry for detection failures in concrete structures.
Studium rázově zatěžovaného slepičího vejce experimentálně i numericky
Buchar, J. ; Trnka, Jan ; Dvořáková, Pavla ; Nedomová, Š.
Eggs were excited by the ball impact on the blunt side or the hipe side or the equator,and the response signals were detected by the laser-vibrometers.Relationship between the dominant frequency and the egg properties has been established.The numerical analysis of the egg impact has been performed using LS DYNA 3D finite element code.
Chování vaječné skořápky nedestruktivně rázově zatěžovaných slepičích vajec
Buchar, J. ; Trnka, Jan ; Dvořáková, Pavla ; Nedomová, Š.
In the given paper the main attention is focused on the vibration behaviour of the egg after impact excitation by a steel ball.A dynamic stiffness parameter,kdyn,is introduced wchis is based on a mathematical mass-spring model of the dynamic behaviour of the egg.A finite element model of the static and dynamic eggshell behaviour has been developed in order to understand better the relationships between the two parameters.
Holography and Interferometry Measurement of Wave Propagation in Thin-Walled Shell with Simple Defect
Trnka, Jan ; Dvořáková, Pavla ; Veselý, Eduard
The paper deals with an interpretation of non-stationary phenomena occuring in impacted thin-walled shell with a simple defect. The electromagnetic pulse generator is used to generate stress wave. The response on this loading are analysed by means of the hybrid diagnostics method, consisting in simultaneous application of the double pulse holointerferometry and laservibrometry.
Analysis of Speckle Pattern Interferometry Fringe Pattern
Dvořáková, Pavla ; Bajgar, Vlastimil ; Trnka, Jan
The contribution deals with fringe analysis obtained by electronic speckle pattern interferometry used to measure deformation of a thin steel plate. The spatial-carrier fringes were introduced to calculate phase function. The Fourier transform method was employed for phase extraction.
Optical computation in Matlab
Dvořáková, Pavla
The contribution deals with the optical computation in Matlab. Matrix methods in paraxial optics is a powerful tool which allow to track any ray during its propagation through an optical system by succesive matrix multiplications. The matrix operation can be then easily and clearly programmed in Matlab.
Detekce a meření přechodových jevů pomocí elektronické speklové interferometrie
Dvořáková, Pavla
Electronic Speckle Pattern Interferometry is used to measure out-of-plane dynamical deformations of diffusely scattering objects.
Dynamická-elektronická speklová interferometrie pro měření normálových posuvů
Dvořáková, Pavla ; Bajgar, Vlastimil ; Trnka, Jan
The contribution deals with the electronic speckle pattern interferometry(ESPI)used to study dynamic deformations. The out-of-plane transient motion of a thin steel plate was excited by focusing of a ruby laser beam. Study of transient phenomena was carried out by a double exposure method.
Pulsní speklová interferometrie
Dvořáková, Pavla ; Bajgar, Vlastimil ; Trnka, Jan
The contribution deals with an application of ESPI for measuring a deformation profile of a thin steel plate loaded by a focusing a ruby laser beam. Monitoring of the normally loaded test-object determined Michelson-type ESPI sensitive to out-of-plane displacement.
Experimentální výzkum lidské lebky zatěžované velmi krátkým rázem
Trnka, Jan ; Dvořáková, Pavla ; Veselý, Jan
The paper consists of two parts. The first one illustrates the use of double pulse holointerferometry to enhance the study of stress wave propagation in human skulls, the second one shows how laser interferometry contributes to ultrasonic diagnostics of biocomposite shell structures.

National Repository of Grey Literature : 45 records found   beginprevious32 - 41next  jump to record:
See also: similar author names
30 DVOŘÁKOVÁ, Pavla
51 DVOŘÁKOVÁ, Petra
14 Dvořáková, Pavlína
51 Dvořáková, Petra
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