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The frequency domain decomposition (FDD) is an output-only system identification technique popular in civil engineering, in particular in structural health monitoring. As an output-only algorithm, it is useful when the input data is unknown. FDD is a modal analysis technique which generates a system realization using the frequency response given (multi-)output data. == Algorithm == # Estimate the power spectral density matrix at discrete frequencies . # Do a singular value decomposition of the power spectral density, i.e. where is a unitary matrix holding the singular values , is the diagonal matrix holding the singular values . # For an degree of freedom system, then pick the dominating peaks in the power spectral density using whichever technique you wish (or manually). These peaks correspond to the mode shapes.〔 ## Using the mode shapes, an input-output system realization can be written. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「frequency domain decomposition」の詳細全文を読む スポンサード リンク
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