Indexed by:Journal Papers

Date of Publication:2017-09-01

Journal:AIAA JOURNAL

Included Journals:Scopus、SCIE、EI

Volume:55

Issue:9

Page Number:3143-3152

ISSN No.:0001-1452

Abstract:For the structural dynamic analysis of complicated beam-type structures, a detailed finite element model with large number of degrees of freedom is almost impossible to be used due to the huge computational cost and storage requirements. Therefore, a novel reduced-order model is proposed to determine the natural frequencies of the beam-type structures in this study, which is established by using a reduction basis along with the polynomial interpolation function. The basic idea is to convert the displacements of finite element model nodes in each cross section to a small set of nodes with a few generalized degrees of freedom. The proposed reduced-order model can gain a significant reduction of computational cost without sacrifice of accuracy; moreover, it has the ability to identify shell lobe-type modes and coupled modes. Several numerical case studies for different beam-type structures, including thin-walled cylinder, stiffened shells, and thin-walled cylinder with cutouts, are studied, and the outcomes are validated by benchmark studies.