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Abstract
This paper deals with the use of the substraction technique and the very simple finite difference formulas for modal parameter estimation. For closely spaced modes, the estimation of the formulas is not accurate and depends strongly on the frequency-response data involved in computations. An iterative procedure based on the substraction technique combined with the finite difference formulas is proposed. Application to experimental frequency response data shows that after the iterative procedure is applied, the estimation depends much less on the data involved, and the estimation reliability and accuracy are significantly improved, especially for closely spaced modes.
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