National Repository of Grey Literature 7 records found  Search took 0.01 seconds. 
Response of quail eggs to non-destruktive impact during their storage
Strnková, J. ; Nedomová, Š. ; Trnka, Jan
During storage there are a number of changes in the egg affecting its quality and technological properties. The egg quality is mostly characterized by albumen quality during the storage. Changes during storage lead to changes in albumen´s consistency, increasing pH and changes in Haugh units. Japanese quail eggs were used for the experiment. These eggs were stored at 6 degrees C for 16 weeks. The submitted paper deals with the influence of the storage duration on the response of quail egg to non destructive impact. The response is measured using of the eggshell surface displacement using of the laser vibrometer. The change in the albumen quality significantly affects the time history of the eggshell surface and namely its representation in the frequency domain. The used method can be used for the non destructive evaluation of the egg quality during its storage.
Behaviour of Selected Varieties of Honey at the Impact Loading
Nedomová, Š. ; Trnka, Jan ; Přidal, A. ; Stoklasová, Pavla ; Buchar, J.
Rheological properties of honey are mainly described by its viscosity. This property is particularly critical during storage, handling and processing. The new method of the evaluation of the mechanical behaviour of honey has been designed. This method is based on the evaluation of the honey response to dynamic loading. Dynamic loading has been realized by fall of bar impact. Response function has been represented by the time history of the honey surface displacement. Response of the tested honey varieties have been evaluated both in the time and frequency domain.
Hodnocení pevnosti ovoce pomocí měření odezvy při impulzivním zatěžování
Dvořáková, Pavla ; Nedomová, Š. ; Severa, L. ; Trnka, Jan ; Buchar, J.
Dynamic resonance frequency based on dynamic frequency response of excited peach was determined by peach physical properties,such as, peach firmness, peach mass, and day of harvesting. Analysis showed that dominant frequency increased with peach firmness increasing, and dominant frequency decreased with increasing of the peach mass.
Lom vaječné skořápky při rázu
Nedomová, Š. ; Trnka, Jan ; Dvořáková, Pavla ; Severa, L. ; Buchar, J.
Hen's eggshell behaviour at the impact on a rigid plate is studied. The critical impact velocity at which eggshell damage starts has been determined. This velocity depends on the egg's shape. LS DYNA 3D finite element code has been used for the evaluation of the stress and strain distribution in the eggshell during its impact. This numerical simulation enables to evaluate the eggshell strength. This strength is independent on the egg shape as well as on the eggshell thickness. It seems that this strength is an intrinsic material parameter.
Zrání sýrů sledované pomocí akustických metod
Severa, L. ; Nedomová, Š. ; Trnka, Jan ; Dvořáková, Pavla ; Buchar, J.
The objective of this study consists in the assessement the suitability of using the acoustic impulse-response technique to evaluate Edam cheese texture and maturity. The acoustic response - history of the surface displacement and the surface velocities were detected by the double-channel laser-vibrometer. The history of the impact force has been also recorded. The non-destructive impact tests could be useful for predicting cheese ripening.
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.

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