Browsing by Author "Yimer, Tamrat"

Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    A Simple Structural System Synthesis from Modal Analysis Results
    (Addis Ababa University, 2009-03) Yimer, Tamrat; Raman, A.(PhD)
    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.