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Applied Sciences
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Ships and Offshore Structures: Design and Mechanical Behavior
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Ships and Offshore Structures: Design and Mechanical Behavior

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Marine Science and Engineering".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 7132

Special Issue Editor

Dr. Yu-Xiang Peng

E-Mail Website
Guest Editor
School of Ocean Engineering and Technology, Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
Interests: ships and offshore structures; fluid structure interaction; computational mechanics

Special Issue Information

Dear Colleagues,

In recent years, the development of the marine economy has received increasing attention, and the exploitation and management of the oceans cannot be separated from the support of advanced marine engineering equipment. Among them, the design and performance evaluation of new ship structures play a crucial role in improving the adaptability and safety of marine equipment.

This Special Issue will focus on, but is not limited to, the new structure forms of marine engineering equipment, the frontier applications of new materials in ships and offshore structures, the design and performance optimization of the structural mechanics of ships and offshore structures, the application of new numerical calculation methods in marine engineering and the performance evaluation of the structural mechanics of ships and offshore structures, performance evaluation of structural mechanics under severe sea states, the mechanism and suppression of deep-sea riser vortex-induced vibrations, real-time monitoring, online evaluation, intelligent warning of marine structural performance, etc.

Many technical difficulties need to be overcome to improve the performance of marine engineering equipment, allowing marine engineering to develop into deep waters and create more social and economic value. It is hoped that the research in this Special Issue will promote a breakthrough in the performance of marine equipment.

Dr. Yu-Xiang Peng
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. Applied Sciences is an international peer-reviewed open access semimonthly 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

  • ship structures
  • offshore structures
  • marine equipment
  • marine structural performance
  • mechanical behavior

Published Papers (6 papers)

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Research

17 pages, 37771 KiB  
Article
Research and Development of a Multi-Point High-Precision Displacement Measuring System for the Installation Space of Vibration Isolation on Submarine Raft Structures
by Yunqing Yu, Shuisheng Xu, Mei Wang and Qiang Xie
Appl. Sci. 2023, 13(21), 12024; https://doi.org/10.3390/app132112024 - 3 Nov 2023
Viewed by 670
Abstract
The well installed status of raft vibration isolation is undoubtedly of great significance in marine engineering, especially for submarines. To achieve this, the accurate measurement of the installation space of the vibration isolation is necessary. The traditional measuring technique has many drawbacks. Therefore, [...] Read more.
The well installed status of raft vibration isolation is undoubtedly of great significance in marine engineering, especially for submarines. To achieve this, the accurate measurement of the installation space of the vibration isolation is necessary. The traditional measuring technique has many drawbacks. Therefore, simultaneously measuring the multi-point spacing with high precision between two metal surfaces is the focus of this work. Based on eddy current sensing principle, a multi-point spacing measuring system with a simple structure and good measurement accuracy has been developed and reported. The system includes a sensor array component, an integrated controlling component, and a calibration platform. The measured data from multiple points are obtained at the same time through the sensor array and are uploaded to the host computer and a corresponding LabVIEW program was exploited to display, process, and store the spacing results. Furthermore, the least square algorithm has been employed to calculate the flatness of the measured metal surfaces, and the GUM (guide to the expression of uncertainty in measurement) method has been applied to evaluate the flatness error uncertainty. The experimental tests show that each measuring duration only lasts for seconds to get results and the error uncertainty of the measured surface flatness could reduce to less than 1.0 μm. The developed measuring system has better efficiency and higher precision compared to traditionally manual operations. The measuring and analysis method could also be applied to other related situations. Full article
(This article belongs to the Special Issue Ships and Offshore Structures: Design and Mechanical Behavior)
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20 pages, 6146 KiB  
Article
Impact Force Mechanism of a Trimaran Model and Its Experimental Validation
by Jiaqi Li and Shili Sun
Appl. Sci. 2023, 13(18), 10382; https://doi.org/10.3390/app131810382 - 17 Sep 2023
Viewed by 650
Abstract
In recent years, trimarans have been used in high-speed transport and in warships, but studies of them have made little progress. We designed a trimaran model and used it to perform a water-entry experiment to find a way to reduce the slamming pressure. [...] Read more.
In recent years, trimarans have been used in high-speed transport and in warships, but studies of them have made little progress. We designed a trimaran model and used it to perform a water-entry experiment to find a way to reduce the slamming pressure. The process of the model entering the water was divided into several steps, and different theoretical models were designed for each step, together with their force analysis. Relying on our experimental platform, we designed three flexible coating thicknesses and six drop heights as the different working conditions. With an analysis of the results under these experimental conditions, the experiment clearly indicates that the flexible cladding on the model can decrease the impact force when the model slams into water. Furthermore, the theoretical models and their corresponding force analyses are validated by the experimental results. Full article
(This article belongs to the Special Issue Ships and Offshore Structures: Design and Mechanical Behavior)
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41 pages, 13728 KiB  
Article
Dynamic Analysis and Safety Assessment of Ships and Cables during Salvage Operations
by Han Zou, Shengtao Chen, Gang Sun and Yongjun Gong
Appl. Sci. 2023, 13(16), 9420; https://doi.org/10.3390/app13169420 - 19 Aug 2023
Viewed by 1112
Abstract
The International Maritime Organization (IMO) emphasizes that shipwreck accidents frequently occur at sea and advocates for the safe recovery of shipwrecks. This paper examines the case of the Korean “Sewol” ferry salvage, where two lifting barges were symmetrically utilized to retrieve a substantial [...] Read more.
The International Maritime Organization (IMO) emphasizes that shipwreck accidents frequently occur at sea and advocates for the safe recovery of shipwrecks. This paper examines the case of the Korean “Sewol” ferry salvage, where two lifting barges were symmetrically utilized to retrieve a substantial shipwreck. The dynamic analysis of the salvage operation is based on the computational fluid dynamics (CFD) approach. The main investigation covers two fundamental physical parameters: the motion response of the lifting barges and shipwreck and the tension response of the lifting cables. Using the parameters of the maximum absolute value (MA), root mean square (RMS), and coefficient of variation (CV), a unified criterion is established to quantitatively evaluate the safety of the salvage operation under different working conditions. The study demonstrates that by carefully considering the enhancement of safety and stability for the three vessels involved in the salvage process and by optimizing the safety performance of the lifting cables, suitable operating windows are determined at wave intervals of (115°, 155°) and (205°, 245°). Under most working conditions, curves illustrating the maximum tensions of lifting cables No. 1–15 and No. 16–30 show a distribution with a “middle part drooping” shape. The placement of connecting cables on the water’s surface at 1.1–1.2 times the salvage spacing between the two lifting barges or the arrangement of inclined lifting cables underwater proves advantageous in constraining the motion response of the three vessels. Reinforcing the lifting cables at the bow and stern ends is recommended. This study presents a methodology for salvaging a shipwreck using two lifting barges, which can be used as a reference for designing related salvage approaches. Full article
(This article belongs to the Special Issue Ships and Offshore Structures: Design and Mechanical Behavior)
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12 pages, 4385 KiB  
Article
Research on the Connector Loads of a Multi-Module Floating Body with Hinged Connector Based on FMFC Model
by Siyu Wang, Xuekang Gu, Yanchao Geng, Yuchao Chen, Jun Ding, Songlin Zhang and Lingyun Xu
Appl. Sci. 2023, 13(10), 6212; https://doi.org/10.3390/app13106212 - 18 May 2023
Cited by 1 | Viewed by 897
Abstract
VLFSs (Very Large Floating Structures) are often assembled by multiple modules through connectors where the connector structure is prone to stress concentration. Therefore, the loads at the connectors have become a significant focus in VLFS design. In this paper, the FMFC (Flexible Module [...] Read more.
VLFSs (Very Large Floating Structures) are often assembled by multiple modules through connectors where the connector structure is prone to stress concentration. Therefore, the loads at the connectors have become a significant focus in VLFS design. In this paper, the FMFC (Flexible Module Flexible Connector) method, which can account for the elastic deformation of each module and the connector, is established in order to predict the coupling response of the connector and the platform. The finite element model of a dual-module transfer platform with a hinged connector is established and the modal shape characteristics of the entire structure are analyzed. The accuracy of the method is verified through a model test, where the model was scaled as 1:50. Furthermore, the RAOs (Response Amplitude Operators) of connector loads were calculated. It was found that the horizontal loads (along the x and y directions) were more sensitive to the wave direction. Furthermore, the wave direction where the maximum short-term significant value appears was not consistent with the direction of the maximum RAO. The loads response law of the VLFS with a hinged connector is summarized in this paper and provides a reference for the design of connectors. Full article
(This article belongs to the Special Issue Ships and Offshore Structures: Design and Mechanical Behavior)
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24 pages, 17598 KiB  
Article
Research on the Hydrodynamic Performance of a Pentamaran in Calm Water and Regular Waves
by Bowen Zhao, Haoyu Jiang, Jiyuan Sun and Dapeng Zhang
Appl. Sci. 2023, 13(7), 4461; https://doi.org/10.3390/app13074461 - 31 Mar 2023
Cited by 2 | Viewed by 1508
Abstract
As a typical multi-hull ship, the pentamaran has a wider deck, higher damage stability, and low-speed seaworthiness in harsh sea conditions compared with other multi-hull types such as the catamaran and trimaran, having more potential for becoming a new type of freight merchant [...] Read more.
As a typical multi-hull ship, the pentamaran has a wider deck, higher damage stability, and low-speed seaworthiness in harsh sea conditions compared with other multi-hull types such as the catamaran and trimaran, having more potential for becoming a new type of freight merchant ship in line with the development trend of the marine economy. In this paper, on the basis of the finite volume method, the numerical simulations and detailed comparative analysis of the monohull and pentamaran in viscous flow were carried out. The resistance prediction in calm water and regular waves and the changes of each resistance component of the pentamaran were explored. The dynamic fluid body interaction (DFBI) module was used for the calculations in calm water, and the overset mesh was used for the calculations in regular waves. The results show that in calm water, the adverse effect of the side hulls on the resistance was mainly reflected in the low-speed range. In the high-speed range, the influence of the side hulls on the resistance can be ignored. At high speeds, the main hull and side hulls of the pentamaran will produce favorable wave-making interference, thereby improving the wave-making performance of the pentamaran. In regular waves, although the added resistance of the pentamaran increased most of the time, its amplitude was smaller than that of the monohull under the same wave condition. This work provides a technical basis for the research on the design and hydrodynamic performance of the pentamaran. Full article
(This article belongs to the Special Issue Ships and Offshore Structures: Design and Mechanical Behavior)
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12 pages, 2664 KiB  
Article
Dynamic Analysis of Underwater Torpedo during Straight-Line Navigation
by Bowen Zhao, Jiyuan Sun, Dapeng Zhang, Keqiang Zhu and Haoyu Jiang
Appl. Sci. 2023, 13(7), 4169; https://doi.org/10.3390/app13074169 - 24 Mar 2023
Cited by 4 | Viewed by 1753
Abstract
Torpedoes play an irreplaceable role in naval warfare; therefore, it is significant to study the dynamic response of the direct navigation of torpedoes. In order to study the dynamic response of torpedoes under different Munk moment coefficients, the dynamic equation of torpedoes is [...] Read more.
Torpedoes play an irreplaceable role in naval warfare; therefore, it is significant to study the dynamic response of the direct navigation of torpedoes. In order to study the dynamic response of torpedoes under different Munk moment coefficients, the dynamic equation of torpedoes is established based on the momentum theorem and the momentum moment theorem. The linear motion mathematical model of torpedoes is obtained. The relationship between the torpedo and the Munk moment coefficient is derived. The straight-line motion model of the torpedo under different Munk moments is established, and the dynamic properties of the space motion of the torpedo are analyzed. It is found that the Munk moment coefficient increase will lead to an increase in the deflection of the torpedo’s direct motion on each degree of freedom, and the Munk moment coefficient is related to the additional mass matrix. During the design of the torpedo, the added mass should be reduced by changing the shape of the torpedo as much as possible so as to reduce the pitch moment, yaw, and roll moments of the torpedo. Full article
(This article belongs to the Special Issue Ships and Offshore Structures: Design and Mechanical Behavior)
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