Characteristic-mode-based component mode synthesis for power flow analysis in complex structures

Yung Chang Tan, Matthew P. Castanier, Christophe Pierre

Research output: Contribution to journalConference articlepeer-review

10 Scopus citations

Abstract

In this paper, Component Mode Synthesis (CMS) is used as a basis for predicting power flow in complex structures. Each component structure may be represented by a separate finite element model. The Craig-Bampton method of CMS is used to formulate a reduced order model of the entire structure. The CMS matrices are further reduced by finding 'characteristic constraint (CC) modes'. These modes are computed by performing an eigenanalysis of the partitions of the CMS mass and stiffness matrices that correspond to the degrees of freedom (DOF) of the constraint modes. A relatively small number of CC modes that capture the primary interface motion are selected to yield a highly reduced order CMS model. The power flow is then calculated by solving the CC mode DOF and corresponding coupling forces. This formulation renders efficient and accurate prediction of vibration transmission in the low- to mid-frequency range. It is shown that the total power flow between component structures is well approximated by considering only the power flow through the selected CC modes. The performance and accuracy of the method are illustrated by examples of two coupled beams, a cantilever plate, and a composite armor vehicle.

Original languageEnglish
Pages (from-to)908-917
Number of pages10
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume1
Issue numberII
StatePublished - 2000
Event41st AIAA/ASME/ASCE/AHS/ASC Structrures, Structural Dynamics, and Materials Conference and Exhibit AIAA/ASME/AHS Adaptive Structures Forum AIAA Non-Deterministic Approaches Forum AIAA Space Inflatables Forum - Atlanta, GA, USA
Duration: 3 Apr 20006 Apr 2000

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