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Advances in Mathematical Physics
Volume 2014 (2014), Article ID 549430, 7 pages
http://dx.doi.org/10.1155/2014/549430
Research Article

Fractal Theory and Contact Dynamics Modeling Vibration Characteristics of Damping Blade

School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Received 27 February 2014; Accepted 16 March 2014; Published 7 April 2014

Academic Editor: Xiao-Jun Yang

Copyright © 2014 Ruishan Yuan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The contact surface structure of dry friction damper is complicate, irregular, and self-similar. In this paper, contact surface structure is described with the fractal theory and damping blade is simplified as 2-DOF cantilever beam model with lumped masses. By changing the position of the damper, lacing and shroud structure are separately simulated to study vibration absorption effect of damping blade. The results show that both shroud structure and lacing could not only dissipate energy but also change stiffness of blade. Under the same condition of normal pressure and contact surface, the damping effect of lacing is stronger than that of shroud structure. Meanwhile, the effect on changing blade stiffness of shroud structure is stronger than that of lacing. This paper proposed that there is at least one position of the blade, at which the damper dissipates the most vibration energy during a vibration cycle.