Free-Decay Nonlinear System Identification via Mass-Change Scheme
Methods for nonlinear system identification of structures generally require input-output measured data to estimate the nonlinear model, as a consequence of the noninvariance of the FRFs in nonlinear systems. However, providing a continuous forcing input to the structure may be difficult or impractic...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2019/1759198 |
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| _version_ | 1832563721158787072 |
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| author | Dario Anastasio Stefano Marchesiello |
| author_facet | Dario Anastasio Stefano Marchesiello |
| author_sort | Dario Anastasio |
| collection | DOAJ |
| description | Methods for nonlinear system identification of structures generally require input-output measured data to estimate the nonlinear model, as a consequence of the noninvariance of the FRFs in nonlinear systems. However, providing a continuous forcing input to the structure may be difficult or impracticable in some situations, while it may be much easier to only measure the output. This paper deals with the identification of nonlinear mechanical vibrations using output-only free-decay data. The presented method is based on the nonlinear subspace identification (NSI) technique combined with a mass-change scheme, in order to extract both the nonlinear state-space model and the underlying linear system. The technique is tested first on a numerical nonlinear system and subsequently on experimental measurements of a multi-degree-of-freedom system comprising a localized nonlinearity. |
| format | Article |
| id | doaj-art-9ac3a8f5e2d04281bdda4160e739e5e3 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-9ac3a8f5e2d04281bdda4160e739e5e32025-02-03T01:12:40ZengWileyShock and Vibration1070-96221875-92032019-01-01201910.1155/2019/17591981759198Free-Decay Nonlinear System Identification via Mass-Change SchemeDario Anastasio0Stefano Marchesiello1Dipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, ItalyDipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, ItalyMethods for nonlinear system identification of structures generally require input-output measured data to estimate the nonlinear model, as a consequence of the noninvariance of the FRFs in nonlinear systems. However, providing a continuous forcing input to the structure may be difficult or impracticable in some situations, while it may be much easier to only measure the output. This paper deals with the identification of nonlinear mechanical vibrations using output-only free-decay data. The presented method is based on the nonlinear subspace identification (NSI) technique combined with a mass-change scheme, in order to extract both the nonlinear state-space model and the underlying linear system. The technique is tested first on a numerical nonlinear system and subsequently on experimental measurements of a multi-degree-of-freedom system comprising a localized nonlinearity.http://dx.doi.org/10.1155/2019/1759198 |
| spellingShingle | Dario Anastasio Stefano Marchesiello Free-Decay Nonlinear System Identification via Mass-Change Scheme Shock and Vibration |
| title | Free-Decay Nonlinear System Identification via Mass-Change Scheme |
| title_full | Free-Decay Nonlinear System Identification via Mass-Change Scheme |
| title_fullStr | Free-Decay Nonlinear System Identification via Mass-Change Scheme |
| title_full_unstemmed | Free-Decay Nonlinear System Identification via Mass-Change Scheme |
| title_short | Free-Decay Nonlinear System Identification via Mass-Change Scheme |
| title_sort | free decay nonlinear system identification via mass change scheme |
| url | http://dx.doi.org/10.1155/2019/1759198 |
| work_keys_str_mv | AT darioanastasio freedecaynonlinearsystemidentificationviamasschangescheme AT stefanomarchesiello freedecaynonlinearsystemidentificationviamasschangescheme |