New separation techniques for output-only modal analysis

Issue title: Dedicated to Professor Bruno Piombo

Article type: Research Article

Authors: Antoni, Jérôme | Garibaldi, Luigi | Marchesiello, Stefano | Sidhamed, Menad

Affiliations: University of Technology of Compiègne, France | Politecnico di Torino, Italy

Note: [] Corresponding author. E-mai: luigi.garibaldi@polito.it

Abstract: The paper is devoted to the problem of discriminating between operational and natural modes of structures excited by generic inputs. This case often occurs when the system under analysis holds rotating parts and is contemporary excited by ambient noise; in this case the output-only techniques may fail being easily trapped in a misinterpretation of the system eigenvalues. A survey of the methods available in literature is given, together with the explanation of their failures. To solve this problem, two new techniques are introduced and their capabilities are checked with numerical and experimental data from a paper machine.

Journal: Shock and Vibration, vol. 11, no. 3-4, pp. 227-242, 2004