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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.
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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.
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Nondestructive Testing of Heterogenous Materials
Trnka, Jan ; Dvořáková, Pavla
The paper deals with experimental research of stress wave propagation in heterogenous materials. Experimental procedures are focused both on the different techniques of the impact loading and on the different diagnostics methods. The aim of this paper is to optimize loading techniques and diagnostic methods to get the reliable data for computer modeling of structures produced from the heterogeneous materials.
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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.
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