Engineering Mechanics

Proceedings Vol. 21 (2015)

ENGINEERING MECHANICS 2015

Copyright © 2015 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

 

J. Voldřich, J. Lazar
pages 352 - 353, full text

To perform the nonlinear vibration analysis of a bladed disc with contacts between blades, the properties of the interface contact elements of the computational model used must be set correctly. In this study, the numerical method is proposed for calculation of the resonant frequencies of the computational model of the bladed disc in case that the so-called “contact stiffnesses” are given. The method is demonstrated for the case of the bladed disc provided with LSB48 blades that comprise two integral contact elements, one in the middle and the second one on the tip of the blade. The values of contact stiffnesses are fitted to get the calculated values of resonant frequencies in accord with the measured ones. The method utilizes the cyclic symmetry properties of the bladed disc.

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