Počet záznamů: 1

Vibration of circular bladed disk with imperfections

  1. 1.
    0368679 - UT-L 2012 RIV GB eng J - Článek v odborném periodiku
    Půst, Ladislav - Pešek, Luděk
    Vibration of circular bladed disk with imperfections.
    International Journal of Bifurcation and Chaos. Roč. 21, č. 10 (2011), s. 2893-2904 ISSN 0218-1274
    Grant CEP: GA ČR GA101/09/1166
    Výzkumný záměr: CEZ:AV0Z20760514
    Klíčová slova: circular bladed disk * vibration * imperfection * nonlinear damping
    Kód oboru RIV: BI - Akustika a kmity
    Impakt faktor: 0.755, rok: 2011
    http://www.worldscinet.com/ijbc/21/2110/S0218127411030210.html

    The steady state response of a model of circular bladed disk with imperfection is investigated. Disk imperfection results from additional two groups of damping heads fixed on opposite ends of one diameter. These damping heads are introduced into the computing model as additional point mass, damping and stiffness. Such type of imperfection causes the bifurcation of double eigenfrequencies into pairs of close eigenfrequencies. The effect of imperfection is examined both numerically on three-dimensional nonrotating FE-model and analytically on a simplified split 2DOF model of rotating disk excited by single point harmonic force. Nonlinear friction connection is analyzed and equivalent linear damping coefficient is derived and used in the calculation procedure. It is shown that nonproportional distribution of damping strongly influences the high of resonance peaks. Some examples of response curves illustrate the dynamic properties of stationary and rotating disks with mass-damping-stiffness imperfection.
    Trvalý link: http://hdl.handle.net/11104/0202960