MODAL ANALYSIS BY STATE-SPACE APPROACH IN FREQUENCY DOMAIN

Document Type : Original Article

Authors

1 Associate Professor, Dept. of Mech. Engr. & Aerospace Science, Unive. of Central Florida, Orlando, FL. U.S.A., Presently with Kuwait Univ., Kuwait.

2 Graduate Student, University of Central Florida,Orlando FL. U.S.A.

Abstract

This paper tests a new procedure to identify the eigenvalue problem matrix "A", and thus the system's modal parameters, by utilizing the frequency response of the system in state-space. A sample identification test is performed with added random error in order to simulate real measuring conditions. Results indicate that it is slightly difficult to identify the "A" matrix of an undamped system. The error in that system must be very small for this type of system to be identified. However, when the identi-fication is repeated several times and then averaged, the identification
becomes more accurate.

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