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Modal identification of structures with a dynamic behaviour characterised by global and local modes at close frequencies.

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Title: Modal identification of structures with a dynamic behaviour characterised by global and local modes at close frequencies.
Authors: Abdelnour, Mena1 (AUTHOR) mena.abdelnour@uni-weimar.de, Zabel, Volkmar1 (AUTHOR)
Source: Acta Mechanica. Mar2024, Vol. 235 Issue 3, p1471-1491. 21p.
Subjects: Modal analysis, Space frame structures, Stochastic analysis, Mode shapes, Degrees of freedom, Strain energy, Parameter identification
Abstract: Identification of modal parameters of a space frame structure is a complex assignment due to a large number of degrees of freedom, close natural frequencies, and different vibrating mechanisms. Research has been carried out on the modal identification of rather simple truss structures. So far, less attention has been given to complex three-dimensional truss structures. This work develops a vibration-based methodology for determining modal information of three-dimensional space truss structures. The method uses a relatively complex space truss structure for its verification. Numerical modelling of the system gives modal information about the expected vibration behaviour. The identification process involves closely spaced modes that are characterised by local and global vibration mechanisms. To distinguish between local and global vibrations of the system, modal strain energies are used as an indicator. The experimental validation, which incorporated a modal analysis employing the stochastic subspace identification method, has confirmed that considering relatively high model orders is required to identify specific mode shapes. Especially in the case of the determination of local deformation modes of space truss members, higher model orders have to be taken into account than in the modal identification of most other types of structures. [ABSTRACT FROM AUTHOR]
Copyright of Acta Mechanica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Modal identification of structures with a dynamic behaviour characterised by global and local modes at close frequencies.
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  Data: <searchLink fieldCode="AR" term="%22Abdelnour%2C+Mena%22">Abdelnour, Mena</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mena.abdelnour@uni-weimar.de</i><br /><searchLink fieldCode="AR" term="%22Zabel%2C+Volkmar%22">Zabel, Volkmar</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Acta+Mechanica%22">Acta Mechanica</searchLink>. Mar2024, Vol. 235 Issue 3, p1471-1491. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Modal+analysis%22">Modal analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Space+frame+structures%22">Space frame structures</searchLink><br /><searchLink fieldCode="DE" term="%22Stochastic+analysis%22">Stochastic analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Mode+shapes%22">Mode shapes</searchLink><br /><searchLink fieldCode="DE" term="%22Degrees+of+freedom%22">Degrees of freedom</searchLink><br /><searchLink fieldCode="DE" term="%22Strain+energy%22">Strain energy</searchLink><br /><searchLink fieldCode="DE" term="%22Parameter+identification%22">Parameter identification</searchLink>
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  Data: Identification of modal parameters of a space frame structure is a complex assignment due to a large number of degrees of freedom, close natural frequencies, and different vibrating mechanisms. Research has been carried out on the modal identification of rather simple truss structures. So far, less attention has been given to complex three-dimensional truss structures. This work develops a vibration-based methodology for determining modal information of three-dimensional space truss structures. The method uses a relatively complex space truss structure for its verification. Numerical modelling of the system gives modal information about the expected vibration behaviour. The identification process involves closely spaced modes that are characterised by local and global vibration mechanisms. To distinguish between local and global vibrations of the system, modal strain energies are used as an indicator. The experimental validation, which incorporated a modal analysis employing the stochastic subspace identification method, has confirmed that considering relatively high model orders is required to identify specific mode shapes. Especially in the case of the determination of local deformation modes of space truss members, higher model orders have to be taken into account than in the modal identification of most other types of structures. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Mechanica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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        Type: general
      – SubjectFull: Space frame structures
        Type: general
      – SubjectFull: Stochastic analysis
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      – SubjectFull: Mode shapes
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      – SubjectFull: Strain energy
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      – SubjectFull: Parameter identification
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              Text: Mar2024
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