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Symmetry
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Applications Based on Symmetry/Asymmetry in Structural Dynamics
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Applications Based on Symmetry/Asymmetry in Structural Dynamics

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (31 January 2025) | Viewed by 5351

Special Issue Editor

Dr. Kamran Foroutan

E-Mail Website
Guest Editor
Energy Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada
Interests: solid and fluid mechanics; vibration analysis; nonlinear analysis; dynamic analysis; analytical modeling; applied mechanics; shells; pipes; elasticity; smart materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Structural dynamics refers to a type of analysis that covers the behavior of a structure after exposure to dynamic excitations. Symmetry/asymmetry in structural dynamics can be considered among the most important notions in determing the behavior of a physical structure when subjected to force. In this regard, it should be expressed that the investigation of applications based on symmetry/asymmetry in the structural analysis of dynamic structures is very important in engineering applications such as submarines, rocket fuel tanks, satellite support structures, missiles, underwater toroidal pressure hull, and fusion reactor containers. It is therefore no surprise that a large number of researchers have been investigating the structural analysis of these structures under various dynamic excitations for decades.

The aim of the present Special Issue is to investigate the application of symmetry/asymmetry in the dynamic structures, which can be extremely useful in engineering and mechanical applications. For instance, symmetry analysis in structural dynamics can help researchers to identify mode localization and energy transfer mechanisms.

We solicit contributions (research and review articles) that cover a broad range of topics on applications related to symmetry/asymmetry in structural dynamics, including (but not limited to) the following areas:

  • Symmetry analysis in structural dynamics;
  • Asymmetric structures and vibration modes;
  • Utilizing asymmetry in structural dynamics to enhance structural response and stability;
  • Investigating the effects of symmetry breaking on vibration modes and modal analysis of complex structural systems;
  • Applications of symmetry/asymmetry in structural dynamics;
  • Symmetry-based design principles in structural dynamics;
  • Exploiting symmetry/asymmetry in structural dynamics to enhance the structural efficiency and load-carrying capacity;
  • Dynamic control through structural asymmetry.

Dr. Kamran Foroutan
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • symmetry analysis in structural dynamics
  • asymmetric structures and vibration modes
  • utilizing asymmetry in structural dynamics to enhance structural response and stability
  • investigating the effects of symmetry breaking on vibration modes and modal analysis of complex structural systems
  • applications of symmetry/asymmetry in structural dynamics
  • symmetry-based design principles in structural dynamics
  • exploiting symmetry/asymmetry in structural dynamics to enhance the structural efficiency and load-carrying capacity
  • dynamic control through structural asymmetry

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (4 papers)

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Research

12 pages, 4239 KiB  
Article
Analysis of Force Characteristics and Influencing Factors of Gas Storage Injection–Production Pipe String
by Huaquan Jiang, Tingjun Wen, Limin Li, Zhengwei Guo, Renhao Zhang, Jun Ma and Kanhua Su
Symmetry 2024, 16(12), 1692; https://doi.org/10.3390/sym16121692 - 20 Dec 2024
Viewed by 569
Abstract
Aiming at addressing the issue of seal failure of connecting threads of injection–production strings in gas storage, a theoretical research study of injection–production strings is conducted. A full-size model of an injection–production string is established by the finite element method, and natural frequency, [...] Read more.
Aiming at addressing the issue of seal failure of connecting threads of injection–production strings in gas storage, a theoretical research study of injection–production strings is conducted. A full-size model of an injection–production string is established by the finite element method, and natural frequency, buckling state, and influence factors are analyzed. Under the condition of ensuring the circumferential expansion displacement of the pipe string, appropriate annular pressure can be used to reduce the stress caused by the buckling of the pipe string. There is a pressure difference between the inside and outside of the curved section of the pipe string, and the larger the radius of curvature, the greater the pressure difference between the inside and outside of the pipe string, and the greater the fluid flow process because of the pressure difference variation caused by the vibration of the pipe string. The pipe string is in a sinusoidal or helical state near the packer position, and it has central symmetry. The variation in the pipe string outside pressure does not affect the position of the symmetric points. The research results can provide theoretical support to understand the mechanical characteristics and vibration mechanism of gas storage injection–production pipe string, identify the main control factors of vibration, and aim in the development of safety control measures. Full article
(This article belongs to the Special Issue Applications Based on Symmetry/Asymmetry in Structural Dynamics)
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18 pages, 40417 KiB  
Article
Influence of Spiral Stiffeners’ Symmetric and Asymmetric Angles on Nonlinear Vibration Responses of Multilayer FG Cylindrical Shells
by Kamran Foroutan and Farshid Torabi
Symmetry 2024, 16(10), 1318; https://doi.org/10.3390/sym16101318 - 6 Oct 2024
Cited by 2 | Viewed by 1181
Abstract
This study utilizes a semi-analytical approach to examine the nonlinear dynamic responses of multilayer functionally graded (MFG) cylindrical shells reinforced by FG spiral stiffeners (FGSSs), which may have symmetric or asymmetric angles, under a thermal condition. It is presumed that the temperature is [...] Read more.
This study utilizes a semi-analytical approach to examine the nonlinear dynamic responses of multilayer functionally graded (MFG) cylindrical shells reinforced by FG spiral stiffeners (FGSSs), which may have symmetric or asymmetric angles, under a thermal condition. It is presumed that the temperature is distributed across the thickness direction. The shell includes three layers: an outer ceramic-rich layer, a middle FG layer, and an inner metal-rich layer. By applying classical shell theory (CST), the smeared stiffeners technique, von Kármán equations, and the Galerkin method, the problem of nonlinear vibrations (NVs) has been addressed. Furthermore, the method of multiple scales (MMSs) is applied to investigate the nonlinear vibrational characteristics of the MFG cylindrical shells reinforced by FGSS, particularly focusing on the 1:2:4 internal resonance and the subharmonic resonance of order 1/2. This study finds that FG spiral stiffeners with symmetric or asymmetric angles and ambient temperature significantly affect the vibrational properties of the MFG cylindrical shells reinforced by spiral stiffeners. Full article
(This article belongs to the Special Issue Applications Based on Symmetry/Asymmetry in Structural Dynamics)
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17 pages, 47189 KiB  
Article
The Properties of Structures with Two Planes of Symmetry
by Sorin Vlase and Calin Itu
Symmetry 2024, 16(8), 1075; https://doi.org/10.3390/sym16081075 - 20 Aug 2024
Viewed by 1433
Abstract
In the domain of civil engineering, the structures encountered usually present symmetries of different types. The causes that determine the use of these symmetries are diverse, starting from esthetic motivations but also dictated by practical reasons, such as the reduction in construction time [...] Read more.
In the domain of civil engineering, the structures encountered usually present symmetries of different types. The causes that determine the use of these symmetries are diverse, starting from esthetic motivations but also dictated by practical reasons, such as the reduction in construction time and costs. These geometric symmetries lead to specific properties that, in certain situations, can help to simplify the calculation of these structures. They can be identified both in the static analysis and the deformability of the structure, as well as in the dynamic analysis in the study of vibrations. If these properties are used, it is possible to reduce the analysis time, and the designer can obtain a quick estimate of the behavior of the structure. Starting from these considerations, this work will determine some of the properties specific to the natural vibrations of certain structures with identical parts in their components (structures that present two planes of symmetry) and will demonstrate how these properties can contribute to reducing the time required for dynamic analysis. An example will be used to exemplify the presented methods. This work allows for further developments and makes possible the development of the existing finite element software by adding some modules to identify such situations by analyzing the input data and using the properties described in the newly introduced algorithms. Full article
(This article belongs to the Special Issue Applications Based on Symmetry/Asymmetry in Structural Dynamics)
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17 pages, 14619 KiB  
Article
Shaking Table Tests on the Seismic Response of Symmetrically Integrated Underground Stations
by Shi Ming, Lianjin Tao and Zhigang Wang
Symmetry 2024, 16(2), 232; https://doi.org/10.3390/sym16020232 - 14 Feb 2024
Cited by 1 | Viewed by 1213
Abstract
This paper focuses on the seismic response of symmetrical underground subway stations to seismic waves with varying frequencies and peak ground accelerations (PGAs), essential in light of growing urban underground transit systems. A 1/40 scale station model was subjected to seismic simulations using [...] Read more.
This paper focuses on the seismic response of symmetrical underground subway stations to seismic waves with varying frequencies and peak ground accelerations (PGAs), essential in light of growing urban underground transit systems. A 1/40 scale station model was subjected to seismic simulations using waves from the Wenchuan and Tangshan earthquakes and an artificial wave spanning 0.1 g to 0.5 g PGAs. Shaking table tests revealed that seismic impacts divide at PGA = 0.3 g; high-frequency waves affect structures more below this threshold, while low-frequency waves have more impact above it. The columns on the third basement level responded more to seismic activity, particularly at their base. The study recommends prioritizing the seismic design of these columns during station construction, especially in earthquake-prone zones. Understanding the dynamic effects of different frequencies and amplitudes is crucial for selecting and reinforcing materials and structural designs to enhance seismic resistance. Full article
(This article belongs to the Special Issue Applications Based on Symmetry/Asymmetry in Structural Dynamics)
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