A Simple Structural System Synthesis from Modal Analysis Results
No Thumbnail Available
Date
2009-03
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
In this paper presented a simple structural system synthesized from modal analysis
results. A method for determining the eigenvalues of a synthesized system by using the
frequency response function (FRF). This method first used matrix Auto-Regressive
Moving Average (ARMA) model in the Laplace domain to describe each subsystem.
Then a modal force method by ARMA model could be established. Only the FRF at the
connecting joints is needed in the analysis to form a matrix named modal force matrix
(FRF matrix). From this matrix, both synthesized system modes and substructure modes
could be extracted simultaneously. Since the inverse operation is not required to form
modal force matrix, the computation is reduced drastically. The eigensolution of the
system in any frequency range could be determined independently.
ANSYS and MATLAB software’s used to extract the modal parameters of synthesized
structural system and each subsystem separately from this matrix (modal force matrix).
Finally compared their results.
Description
Keywords
Mechanical Engineering