In the last few years various methods of identifying structural dynamics models from modal testing data have appeared. This paper presents a comparison of four of these algorithms: the Eigensystem Realization Algorithm (ERA), the modified version ERA/IX2 where DC indicates that it makes use of data correlations, the Q-Markov Cover algtxithm, and an algorithm due to Moonen, DeMoor, Vandenberghe and Vandewaile. The comparison is made using a five mode computer model of the 20 meter Mini-Mast truss structure at NASA Langley Research Center, and various noise levels are superimposed to produce simulated data. The results show that for the example considered ERA/DC generally gives the best results; that ERA/IX2 is always at least as good as ERA which is shown to be a special case of ERA/DC; that Q-Markov requires the use of significantly more data than ERA/IX2 to produce comparable results; and that in some situations Q-Markov cannot produce comparable results.
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