Browsing by Subject "beam vibrations"

Now showing 1 - 3 of 3

Access status: Open Access ,
Model based predictive control of beam with magnetorheological fluid
(2011) Snamina, Jacek
In the work a model predictive control method was applied to control the beam vibrations. Model predictive control (MPC) is widely used as advanced control methodology. The considered beam consists of two outer layers made of aluminium and MR fluid layer in between. Activation of the MR fluid is realized by magnetic field. The analysis of strain and stress in three-layered beam were done. Then the equation of forced vibration of beam in the vicinity of the first resonances was derived. Based on this equation the simulation of MPC application was performed for the sinusoidal and random excitation.
Access status: Open Access ,
New possibilities of the active damping of vibrations
(Wydawnictwa AGH, 2007) Bajkowski, Jerzy; Tadzik, Piotr; Zalewski, Robert
In presented paper a new proposition of granular structure, composed on the basis of granular materials placed in hermetic space with underpressure, as a damping material for vibrated steel beam has been described. Three different types of laboratory tests have been described: fundamental strength properties of granular testing specimen, bending of granular beam and damping of the steel beam vibrations using special granular structures. Obtained results revealed that the behavior of such a structure could be easily controlled by underpressure parameter. Also damping characteristics of vibrated steel beam could be controlled by changing internal underpressure value.
Access status: Open Access ,
On nonexistence of global in time solution for a mixed problem for a nonlinear evolution equation with memory generalizing the Voigt-Kelvin rheological model
(Wydawnictwa AGH, 2017) Pukach, Petro; Il'kiv, Volodymyr; Nytrebych, Zinovii; Vovk, Myroslava
The paper deals with investigating of the first mixed problem for a fifth-order nonlinear evolutional equation which generalizes well known equation of the vibrations theory. We obtain sufficient conditions of nonexistence of a global solution in time variable.