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A new excitation method : Combining burst random excitation with cyclic averaging

The use of controlled excitation is fundamental to the acquisition of input-output data for the purpose of estimating modal parameters. The characteristics of the excitation greatly influence the quality of the resulting measurements. This paper first presents an overview of the basic excitation methods, such as, random, periodic random, pseudo-random, and burst random. The paper then reviews the use of cyclic averaging with random excitation methods. Finally, the paper develops a new excitation method that is the result of combining cyclic averaging with burst random excitation. This combination of methods results in an improved signal-to-noise ratio (SNR) for lightly damped structures where leakage is a significant problem. An experimental example is given for a typical lightly damped, structural system.