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Experimental and theoretical approaches to vibration models for multi-domain asymmetrical stepped cylindrical shells: Customizing mass distribution.

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Title: Experimental and theoretical approaches to vibration models for multi-domain asymmetrical stepped cylindrical shells: Customizing mass distribution.
Authors: Heidari-Soureshjani, Ali1 (AUTHOR), Asadi, Esmail1 (AUTHOR), Talebitooti, Roohollah1 (AUTHOR) rtalebi@iust.ac.ir, Talebitooti, Mostafa2 (AUTHOR)
Source: Journal of Vibration & Control. Jul2026, Vol. 32 Issue 13/14, p3808-3825. 18p.
Subjects: Cylindrical shells, Mechanical vibration research, Elasticity, Finite element method, Differential quadrature method
Abstract: This research explores the free vibration of asymmetrically stepped cylindrical shells using three-dimensional (3D) elasticity theory. In many real-world structures, the thickness is not uniform but exhibits sudden changes in cross-section that are not symmetrical about the midplane or includes attached components, such as flanges, leading to significant geometric discontinuities. These discontinuities become particularly influential in thick asymmetric shells. This study aims to achieve realistic modeling of these complex structures by carefully considering geometric discontinuities and coupling a series of cylindrical segments. The mass distribution along the shell's length is tailored based on a constant total mass to fine-tune vibrational responses. The two-directional generalized differential quadrature (2D-GDQ) method is employed to accurately enforce boundary and matching conditions at the interfaces of adjacent multi-domain structures. In practical applications, steps in cylindrical structures are frequently asymmetric. Consequently, the proposed approach enables precise modeling of asymmetric stepped shells with non-aligned mid-surfaces without resorting to simplifications. The theoretical results are validated through experimental modal testing, finite element modeling (FEM) and those previously published in literature. Subsequently, the study examines the effects of key parameters, including boundary condition, step location, step configurations (external, internal, and dual), symmetrical/asymmetrical thickness, and mass distribution. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Vibration & Control is the property of Sage Publications, Ltd. 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 194727616
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Experimental and theoretical approaches to vibration models for multi-domain asymmetrical stepped cylindrical shells: Customizing mass distribution.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Vibration+%26+Control%22">Journal of Vibration & Control</searchLink>. Jul2026, Vol. 32 Issue 13/14, p3808-3825. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Cylindrical+shells%22">Cylindrical shells</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+vibration+research%22">Mechanical vibration research</searchLink><br /><searchLink fieldCode="DE" term="%22Elasticity%22">Elasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Differential+quadrature+method%22">Differential quadrature method</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This research explores the free vibration of asymmetrically stepped cylindrical shells using three-dimensional (3D) elasticity theory. In many real-world structures, the thickness is not uniform but exhibits sudden changes in cross-section that are not symmetrical about the midplane or includes attached components, such as flanges, leading to significant geometric discontinuities. These discontinuities become particularly influential in thick asymmetric shells. This study aims to achieve realistic modeling of these complex structures by carefully considering geometric discontinuities and coupling a series of cylindrical segments. The mass distribution along the shell's length is tailored based on a constant total mass to fine-tune vibrational responses. The two-directional generalized differential quadrature (2D-GDQ) method is employed to accurately enforce boundary and matching conditions at the interfaces of adjacent multi-domain structures. In practical applications, steps in cylindrical structures are frequently asymmetric. Consequently, the proposed approach enables precise modeling of asymmetric stepped shells with non-aligned mid-surfaces without resorting to simplifications. The theoretical results are validated through experimental modal testing, finite element modeling (FEM) and those previously published in literature. Subsequently, the study examines the effects of key parameters, including boundary condition, step location, step configurations (external, internal, and dual), symmetrical/asymmetrical thickness, and mass distribution. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Vibration & Control is the property of Sage Publications, Ltd. 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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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1177/10775463251345006
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 3808
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      – SubjectFull: Cylindrical shells
        Type: general
      – SubjectFull: Mechanical vibration research
        Type: general
      – SubjectFull: Elasticity
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Differential quadrature method
        Type: general
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      – TitleFull: Experimental and theoretical approaches to vibration models for multi-domain asymmetrical stepped cylindrical shells: Customizing mass distribution.
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            NameFull: Heidari-Soureshjani, Ali
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            NameFull: Asadi, Esmail
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            NameFull: Talebitooti, Roohollah
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            NameFull: Talebitooti, Mostafa
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            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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