Research Papers: Gas Turbines: Structures and Dynamics

Interface Reduction in Craig–Bampton Component Mode Synthesis by Orthogonal Polynomial Series

[+] Author and Article Information
Luigi Carassale

Department of Mechanical, Energy,
Management and Transportation Engineering,
University of Genova,
Genova 16145, Italy
e-mail: luigi.carassale@unige.it

Mirko Maurici

Ansaldo Energia,
Genova 16152, Italy
e-mail: mirko.maurici@ansaldoenergia.com

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 11, 2017; final manuscript received August 15, 2017; published online December 12, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(5), 052504 (Dec 12, 2017) (8 pages) Paper No: GTP-17-1341; doi: 10.1115/1.4038154 History: Received July 11, 2017; Revised August 15, 2017

The component mode synthesis (CMS) based on the Craig–Bampton (CB) method has two strong limitations that appear when the number of the interface degrees-of-freedom (DOFs) is large. First, the reduced-order model (ROM) obtained is overweighed by many unnecessary DOF. Second, the reduction step may become extremely time consuming. Several interface reduction (IR) techniques addressed successfully the former problem, while the latter remains open. In this paper, we tackle this latter problem through a simple IR 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 IR methods on a case study regarding a rotor blade of an axial compressor.

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Fig. 1

Mesh of airfoil (a) and root (b)

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Fig. 2

Orthogonal polynomial series interface modes. Polynomial order d = 3.

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Fig. 3

Error in the natural frequency with respect to the classical CB method as a function of the IR order. The separation among modes with radial, axial, and tangential direction is pertinent only for the OPS method.

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Fig. 4

Two-dimensional FE used for integration on the interface



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