Interface Reduction for the Component Mode Synthesis of Bladed Disks by Orthogonal Polynomial series

[+] Author and Article Information
Luigi Carassale

Dept. of Mechanical, Energy, Management and Transportation Engineering, University of Genova, Italy

Mirko Maurici

Ansaldo Energia, Italy

1Corresponding author.

ASME doi:10.1115/1.4038154 History: Received July 11, 2017; Revised August 15, 2017


The component mode synthesis based on the Craig-Bampton method has two strong limitations that appear when the number of the interface degrees of freedom is large. First, the reduced-order model obtained is overweighed by many unnecessary degrees of freedom. Second, the reduction step may become extremely time consuming. Several interface reduction techniques addressed successfully the former problem, while the latter remains open. In this paper we address this latter problem through a simple interface-reduction technique based on an a-priory choice of the interface modes. An efficient representation of the interface displacement field is achieved adopting a set of orthogonal basis functions determined by the interface geometry. The proposed method is compared with other existing interface reduction methods on a case study regarding a rotor blade of an axial compressor.

Copyright (c) 2017 by ASME
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