Vibration of circular bladed disk with imperfections

0368679 - ÚT 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. E-ISSN 1793-6551
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