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Monday, July 8 • 16:10 - 16:30
NONLINEAR FORCED RESPONSE ANALYSIS OF BLADED DISKS USING A RELATIVE CYCLIC COMPONENT MODE SYNTHESIS APPROACH

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High cyclic fatigue (HCF) is by far the main source of failure of bladed disks in turbomachinery applications. In order to reduce the vibration amplitudes, dry friction damping has been widely used in the design of bladed disks in different forms such as; blade root joints, shrouds, solid dampers and etc. This will make the dynamic analysis of bladed disks more challenging due to presence of nonlinear interactions between contacting surfaces. The purpose of the current study is to develop an efficient and highly compact reduced order model (ROM) for nonlinear dynamics of bladed disks subjected to different sources of friction damping. The developed ROM consists of two steps: first, representing the kinematics of the contact nodes lying on adjacent friction interfaces in terms of relative displacements between the node pairs. Afterwards, performing the Craig-Bampton Component Mode Synthesis (CB-CMS) on the full-order model already transformed into relative coordinates. Implementation of relative coordinates not only reduces the computational time but also enhances the CB-CMS basis by incorporating the fully stuck modeshapes of the fundamental sector. Relative coordinates have been already used to reduce the size of the nonlinear problem, in case of contact surfaces located inside the bladed disk fundamental sector, while the proposed formulation in this paper extends their use to contact surfaces over the sector boundaries, where cyclic symmetry boundary conditions are applied. The proposed method was applied to a bladed disk with shroud and blade root friction damping. Numerical simulations revealed the efficiency and the accuracy of the proposed ROM for forced response analysis of bladed disks.

Moderators
EP

Elsa Piollet

Dr, Polytechnique Montréal
avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →
AR

Annie Ross

Professor, Polytechnique Montreal

Authors

Monday July 8, 2019 16:10 - 16:30 EDT
St-Laurent 8
  T07 Struct. dyn. & nonlin. vib., RS02 Vibr & cntrl of nonlin mech syst