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Aeroelastic divergence modeled by means of the stochastic resonance
Náprstek, Jiří; Pospíšil, Stanislav
2014 - English
The divergence is one of the most important and dangerous phenomenon of aeroelastic post-critical states occurring at a prismatic slender beam in a cross-flow. This phenomenon manifests by stable periodic hopping between two nearly constant limits perturbed by random noises. Experimental observation and numerical simulation motivates an idea to model this process as the effect of the stochastic resonance. Being observed and practically used in a number of disciplines in physics (optics, plasma physics, atd.) its mathematical basis follows in the most simple case from properties of the Duffing equation with negative linear part of the stiffness. The occurrence of this phenomenon depends on certain combinations of input parameters, which can be determined theoretically and verified experimentally in the wind tunnel.
Keywords:
stochastic resonance; interwell hopping; non-linear vibration; aeroelastic divergence
Available in digital repository of the ASCR
Aeroelastic divergence modeled by means of the stochastic resonance
The divergence is one of the most important and dangerous phenomenon of aeroelastic post-critical states occurring at a prismatic slender beam in a cross-flow. This phenomenon manifests by stable ...
Influence of geometric parameters on the stiffness of traditional dovetail timber joint
Kunecký, Jiří; Cacciotti, Riccardo; Kloiber, Michal
2012 - English
The paper presents the development of numerical modeling for a traditional dovetail timber joint. The objective is to find the influence of its geometrical properties on the mechanical stiffness of the joint as well as to assess the main problems and limitations faced during the numerical modeling of the structure. An experiment with a replicated timber joint was used to validate the model. Material properties were ascertained and contact adjustment was made. Parametric study was performed: two angles of the joint beams were varied. Suitable ranges of the angles for each type of loading were found. Main limitations and problems present in the modeling are depicted in the discussion.
Keywords:
timber joint; numerical modeling; dovetail
Available in digital repository of the ASCR
Influence of geometric parameters on the stiffness of traditional dovetail timber joint
The paper presents the development of numerical modeling for a traditional dovetail timber joint. The objective is to find the influence of its geometrical properties on the mechanical stiffness of ...
Odlišnosti historických a moderních vápenných pojiv použitých pro přípravu malt a omítek
Válek, Jan
2011 - Czech
Příspěvek ukazuje poznatky z oblasti charakterizování historických malt a poukazuje na potencionální odlišnosti tradiční výroby vápenného pojiva a přípravy malt oproti současné výrobě. Cílem příspěvku je revidovat současné poznatky a vytyčit směry výzkumu v oblasti výroby vápenného pojiva jako tradičního materiálu pro obnovu památek. The paper presents foundings from the field of characterisation of historic mortars and points at potential differences between traditional production of lime binder and preparation of mortars and “modern” ones. The aim of the contribution is to revise the current state of the art and mark out main research directions.
Keywords:
lime; traditional lime production; characterisation of historic mortars
Available in a digital repository NRGL
Odlišnosti historických a moderních vápenných pojiv použitých pro přípravu malt a omítek
Příspěvek ukazuje poznatky z oblasti charakterizování historických malt a poukazuje na potencionální odlišnosti tradiční výroby vápenného pojiva a přípravy malt oproti současné výrobě. Cílem příspěvku ...
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