A Simple Structural System Synthesis From Modal Analysis Results

In this paper presented a simple structural system synthesized from modal analysisrnresults. A method for determining the eigenvalues of a synthesized system by using thernfrequency response function (FRF). This method first used matrix Auto-RegressivernMoving Average (ARMA) model in the Laplace domain to describe each subsystem.rnThen a modal force method by ARMA model could be established. Only the FRF at thernconnecting joints is needed in the analysis to form a matrix named modal force matrixrn(FRF matrix). From this matrix, both synthesized system modes and substructure modesrncould be extracted simultaneously. Since the inverse operation is not required to formrnmodal force matrix, the computation is reduced drastically. The eigensolution of thernsystem in any frequency range could be determined independently.rnANSYS and MATLAB software’s used to extract the modal parameters of synthesizedrnstructural system and each subsystem separately from this matrix (modal force matrix).rnFinally compared their results.

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