This paper presents a methodology that allows using large (in time) but sparse (in space) data from sensors to get a full picture of the dynamic response of a scaled model catamaran structure. Increasing the amount of information relative to the structural behavior is critical for some applications like structural health monitoring and condition-based maintenance. Loads and elastic deflections are estimated by combining the information obtained from the measured structural data with a finite element model of the system given that some statistical properties of the external inputs are preliminary known. Craig-Bampton method is used to achieve a reduced-order model since it is particularly suited to describe the modal response along with the estimation of the concentrated loads. A natural second-order observer is then defined to provide an optimal estimation of forces and elastic deflections along the hull structure. The validation of this technique is pursued by comparing estimated and known values of the response and a sensitivity analysis of the accuracy with respect to some parameters is considered as well.

Estimation of the deflection field over a ship structure model based on pointwise measurements / Saltari, F.; Dessi, D.; Faiella, E.; Mastroddi, F.. - (2019), pp. 285-292. (Intervento presentato al convegno 7th International Conference on Marine Structures, MARSTRUCT 2019 tenutosi a Dubrovnik; Croatia) [10.1201/9780429298875-33].

Estimation of the deflection field over a ship structure model based on pointwise measurements

Saltari F.;Dessi D.;Mastroddi F.
2019

Abstract

This paper presents a methodology that allows using large (in time) but sparse (in space) data from sensors to get a full picture of the dynamic response of a scaled model catamaran structure. Increasing the amount of information relative to the structural behavior is critical for some applications like structural health monitoring and condition-based maintenance. Loads and elastic deflections are estimated by combining the information obtained from the measured structural data with a finite element model of the system given that some statistical properties of the external inputs are preliminary known. Craig-Bampton method is used to achieve a reduced-order model since it is particularly suited to describe the modal response along with the estimation of the concentrated loads. A natural second-order observer is then defined to provide an optimal estimation of forces and elastic deflections along the hull structure. The validation of this technique is pursued by comparing estimated and known values of the response and a sensitivity analysis of the accuracy with respect to some parameters is considered as well.
2019
7th International Conference on Marine Structures, MARSTRUCT 2019
estimate of structural systems; digital twins; reduced-order model
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Estimation of the deflection field over a ship structure model based on pointwise measurements / Saltari, F.; Dessi, D.; Faiella, E.; Mastroddi, F.. - (2019), pp. 285-292. (Intervento presentato al convegno 7th International Conference on Marine Structures, MARSTRUCT 2019 tenutosi a Dubrovnik; Croatia) [10.1201/9780429298875-33].
File allegati a questo prodotto
File Dimensione Formato  
Saltari_estimation-of-deflection_2019.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 1.55 MB
Formato Adobe PDF
1.55 MB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1335477
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact