Repository logo

Browsing by Subject "actuators"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    The use of piezoelectric elements to control vibrations of ax SMA material shaft
    (Wydawnictwa AGH, 2007) Gałkowski, Zdzisław
    In the paper an analysis of the influence of structural friction and piezoelectric elements on damping of torsional vibration in a shaft is presented. The structural friction between the piezoelectric actuators and the shaft is taken into account. It is assumed that the shaft is made of SMA material. A dependency describing the equivalent Kirchhoff modulus and the equivalent viscotic damping coefficient is introduced for the assumed material. For the purpose of the analysis a mathematical model of a permanent shaft-sleeve joint is formulated. The obtained differential equations of motion are solved using the asymptotic Bogoliubov-Krylov-Mitropolsky method via developing relations for derivatives of amplitude and phase. The obtained equations are solved for the case of harmonic excitation with uniformly increasing frequency of the driving torque and the effect of the gain factor magnitude on the damping level is examined. On the grounds of numerical simulations the growth of damping efficiency in the joint as a function of the gain factor is confirmed.