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Article | REF: R6180 V2

Experimental modal analysis

Authors: Emmanuel FOLTÊTE, Morvan OUISSE, Gaël CHEVALLIER

Publication date: June 10, 2025 | Lire en français

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    7. Local modal identification

    We present here an example of a local modal identification method in the frequency sense, involving an isolated mode or a small group of coupled modes. This method was formalized by René FILLOD and programmed by Jean Piranda in the early versions of the MODAN© software developed at the Laboratoire de Mécanique Appliquée de Besançon, now the Département Mécanique Appliquée of the FEMTO-ST Institute. It relies on the method of least squares to identify the pole-residual model that best represents the experimental data, a principle also known as FRF curve-fitting.

    7.1 SISO identification

    First, we look at a test with a single input and a single output (SISO = Single Input Single Output). The structure is then subjected to a force at a given point and in a given...

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