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Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.07 vteřin. 
Finite element solution of the nonlinear 2DOFs dynamic system under random Gaussian excitation using the Fokker-Planck equation
 Král, Radomil ; Náprstek, Jiří
Papers published until now are dealing with single degree of freedom (SDOF) systems. So the respective FP equation includes two independent space variables only (x1, x2). Nevertheless stepping over this limit and entering into a true multi-dimensionality a number of specific problems must be overcome. While in usual FEM practice the number of space variables is two or three, investigating FP equation, so 2n independent space variables emerges. It means for instance 12 space variables when random motion of a rigid body in space with six degrees of freedom is studied. Many requirements should be respected which are out of a conventional practice of Finite Element employment.
Úplný záznam
Dynamics of beam pair coupled by visco-elastic interlayer
 Náprstek, Jiří ; Hračov, Stanislav
Two parallel slender beams with visco-elastic interlayer can serve as a relevant mathematical model of a number of engineering systems. A typical example is a double skin facade of tall buildings. The outer skin can be considered as a dynamic damper and thus contribute to comfort inside the building. Many applications emerge in power piping when using two coaxial pipes with an interlayer in order to suppress vibration due to flow and structure interaction. Similar inconvenient behavior can exhibit panels which fall into the flutter post-critical state. Further applications can be expected at industrial chimneys, towers, etc. In principle the idea of vibration damping using such a formation is inspired by very well known tuned mass damper. However its internal structure, function, limitations and singular states are incomparably more complicated and therefore adequate applications should be cautious.
Úplný záznam
Combined effect of passive damping element and soil-structure interaction on dynamic behaviour of tall slender structure
 Hračov, Stanislav ; Macháček, Michael
The presented paper is focused on the investigation of dynamic behaviour of tall slender structure taking into account SSI and a presence of TMD. The main aim was to qualitatively and quantitatively assess effect of both phenomena on changes in basic dynamic properties in relation to classically damped fixed-base structure. In particular, the differences in resonant frequencies, in the effective damping and in the character of the dynamic response were studied.
Úplný záznam

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