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Axial Vibration Characteristics of Piecewise Large Space Truss Structures.

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Title: Axial Vibration Characteristics of Piecewise Large Space Truss Structures.
Authors: Zeng, Xianhong1,2 (AUTHOR), Zhang, Yin3,4 (AUTHOR), Chen, Hongcheng5 (AUTHOR), Wu, Han2 (AUTHOR) wuhan@imech.ac.cn, Huang, Zundi1 (AUTHOR), Wu, Shunan (AUTHOR) wushunan@mail.sysu.edu.cn
Source: International Journal of Aerospace Engineering. 6/1/2026, Vol. 2026, p1-17. 17p.
Subjects: Large space structures (Astronautics), Eigenfrequencies, Structural components, Forced vibration (Mechanics), Oscillations, Finite element method, Structural dynamics
Abstract: Large space truss structures (LSTS) are essential load‐bearing components in many spacecraft. Owing to their large size, lightweight design, and high flexibility, they inherently exhibit very low natural frequencies and small damping ratios, making them susceptible to persistent vibrations induced by small disturbances. To address this issue, this study investigates a piecewise LSTS with tunable spring–damper joints, which both reflects the segmented assembly characteristics in practice and captures the interface discontinuities that significantly affect vibration characteristics. An analytical framework for the axial vibration of a piecewise elastic bar is developed using Hamilton′s principle in a dimensionless form, whereas the boundary and transition conditions are obtained from the principle of minimum potential energy. The resulting characteristic equations are solved to determine the natural frequencies and discontinuous mode shapes, and the framework is further extended to forced vibration under harmonic and transient excitations. The analytical solutions are validated against finite element results, with relative errors in the first eight modes remaining below 1.3%. The results show that, compared with an equivalent uniform truss/bar, segmentation with compliant joints further reduces the natural frequencies because of local stiffness loss at the interfaces. Nevertheless, the displacement discontinuities at the joints localize elastic potential energy in the springs and enable its dissipation by the dampers, thereby reducing both steady‐state and transient responses. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Aerospace Engineering is the property of Wiley-Blackwell 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: Axial Vibration Characteristics of Piecewise Large Space Truss Structures.
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  Data: <searchLink fieldCode="AR" term="%22Zeng%2C+Xianhong%22">Zeng, Xianhong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Yin%22">Zhang, Yin</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Hongcheng%22">Chen, Hongcheng</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Han%22">Wu, Han</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> wuhan@imech.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Huang%2C+Zundi%22">Huang, Zundi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Shunan%22">Wu, Shunan</searchLink> (AUTHOR)<i> wushunan@mail.sysu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Aerospace+Engineering%22">International Journal of Aerospace Engineering</searchLink>. 6/1/2026, Vol. 2026, p1-17. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Large+space+structures+%28Astronautics%29%22">Large space structures (Astronautics)</searchLink><br /><searchLink fieldCode="DE" term="%22Eigenfrequencies%22">Eigenfrequencies</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+components%22">Structural components</searchLink><br /><searchLink fieldCode="DE" term="%22Forced+vibration+%28Mechanics%29%22">Forced vibration (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Oscillations%22">Oscillations</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+dynamics%22">Structural dynamics</searchLink>
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  Label: Abstract
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  Data: Large space truss structures (LSTS) are essential load‐bearing components in many spacecraft. Owing to their large size, lightweight design, and high flexibility, they inherently exhibit very low natural frequencies and small damping ratios, making them susceptible to persistent vibrations induced by small disturbances. To address this issue, this study investigates a piecewise LSTS with tunable spring–damper joints, which both reflects the segmented assembly characteristics in practice and captures the interface discontinuities that significantly affect vibration characteristics. An analytical framework for the axial vibration of a piecewise elastic bar is developed using Hamilton′s principle in a dimensionless form, whereas the boundary and transition conditions are obtained from the principle of minimum potential energy. The resulting characteristic equations are solved to determine the natural frequencies and discontinuous mode shapes, and the framework is further extended to forced vibration under harmonic and transient excitations. The analytical solutions are validated against finite element results, with relative errors in the first eight modes remaining below 1.3%. The results show that, compared with an equivalent uniform truss/bar, segmentation with compliant joints further reduces the natural frequencies because of local stiffness loss at the interfaces. Nevertheless, the displacement discontinuities at the joints localize elastic potential energy in the springs and enable its dissipation by the dampers, thereby reducing both steady‐state and transient responses. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Aerospace Engineering is the property of Wiley-Blackwell 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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        Value: 10.1155/ijae/2258617
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      – Code: eng
        Text: English
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        PageCount: 17
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      – SubjectFull: Large space structures (Astronautics)
        Type: general
      – SubjectFull: Eigenfrequencies
        Type: general
      – SubjectFull: Structural components
        Type: general
      – SubjectFull: Forced vibration (Mechanics)
        Type: general
      – SubjectFull: Oscillations
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      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Structural dynamics
        Type: general
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      – TitleFull: Axial Vibration Characteristics of Piecewise Large Space Truss Structures.
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            NameFull: Zeng, Xianhong
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            NameFull: Zhang, Yin
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            NameFull: Wu, Han
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            NameFull: Huang, Zundi
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              M: 06
              Text: 6/1/2026
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              Y: 2026
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              Value: 2026
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