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Sustainable Design and Structural Integrity of Eco-Friendly Ships and Offshore...
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Sustainable Design and Structural Integrity of Eco-Friendly Ships and Offshore Structures

A Special Issue of Journal of Marine Science and Engineering (ISSN 2077-1312) belonging to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (5 August 2026) | Viewed by 3308

Editor

Dr. Jaemin Lee

E-Mail Website
Guest Editor
Major of Mechanical Systems Engineering, Pukyong National University, Busan, Republic of Korea
Interests: energy storage system design and structural integrity; dimensional accuracy and thermal distortion analysis in welded structures

Special Issue Information

Dear Colleagues,

The maritime industry is undergoing a significant paradigm shift toward decarbonization and sustainability. This Special Issue aims to address the critical engineering challenges associated with the design and safety of next-generation maritime technologies. We invite researchers to submit high-quality papers focusing on the structural integrity, dynamic performance, and design optimization of eco-friendly vessels (e.g., LNG-, hydrogen-, and ammonia-fueled ships) and renewable energy offshore platforms. The scope and topics of interest include, but are not limited to, fatigue and fracture analysis, thermal distortion in welded structures, lightweight design strategies, and reliability assessments under extreme environmental conditions. By integrating theoretical research with practical applications, this issue seeks to advance the technical standards required to ensure the safety and longevity of future marine infrastructures.

Dr. Jaemin Lee
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering 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 2600 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

  • eco-friendly ships
  • offshore structures
  • structural integrity
  • sustainable design
  • fatigue and reliability
  • welded structures
  • green maritime technology
  • finite element analysis (FEA)
  • extreme environments

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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

14 pages, 4375 KB  
Article
Feasibility of Using Oil from Spent Coffee Grounds in Small-Scale Marine Boilers
by Tae-ho Lee, Young-hyun Ryu, Jin-ho Cho and Chunguang Jin
J. Mar. Sci. Eng. 2026, 14(10), 879; https://doi.org/10.3390/jmse14100879 - 9 May 2026
Viewed by 504
Abstract
This study investigated the potential of using pyrolysis oil derived from spent coffee grounds (SCGs) as an alternative marine fuel to comply with the International Maritime Organization’s 2050 carbon-neutrality targets. A 30 L-class small-scale marine boiler was designed and fabricated to comparatively analyze [...] Read more.
This study investigated the potential of using pyrolysis oil derived from spent coffee grounds (SCGs) as an alternative marine fuel to comply with the International Maritime Organization’s 2050 carbon-neutrality targets. A 30 L-class small-scale marine boiler was designed and fabricated to comparatively analyze the combustion and exhaust emission characteristics of coffee ground oil (CGO) blended with marine gas oil at blending ratios ranging from 0% to 25%. The experimental results indicated that as the blending ratio increased, the concentrations of oxygen and carbon monoxide slightly decreased, whereas those of carbon dioxide and nitrogen oxides (NOx) tended to increase. The combustion efficiency was consistently maintained at approximately 79.2%, confirming the potential feasibility of CGO as an alternative fuel. However, the study identified limitations in achieving carbon neutrality through blending alone. Consequently, further research on emulsification technologies and combustion optimization is needed to address phase separation caused by density differences and mitigate NOx emissions. Full article
(This article belongs to the Special Issue Sustainable Design and Structural Integrity of Eco-Friendly Ships and Offshore Structures)
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26 pages, 1855 KB  
Article
Start–Stop Cycle-Induced Failure-Mode Transition in SOFC-Powered Northern Sea Route Shipping: A Hierarchical Bayesian Competing-Risk Analysis
by EunJoo Park, Hyochan Kwon and Jinkwang Lee
J. Mar. Sci. Eng. 2026, 14(9), 858; https://doi.org/10.3390/jmse14090858 - 3 May 2026
Viewed by 509
Abstract
Solid oxide fuel cells (SOFCs) are a promising near-zero-emission propulsion source for Northern Sea Route (NSR) vessels, but their yttria-stabilized zirconia (YSZ) electrolyte and Ni-cermet anode are susceptible to thermomechanical degradation under repetitive start–stop thermal cycling. We develop a hierarchical Bayesian competing-risk framework [...] Read more.
Solid oxide fuel cells (SOFCs) are a promising near-zero-emission propulsion source for Northern Sea Route (NSR) vessels, but their yttria-stabilized zirconia (YSZ) electrolyte and Ni-cermet anode are susceptible to thermomechanical degradation under repetitive start–stop thermal cycling. We develop a hierarchical Bayesian competing-risk framework built on a dual degradation model that decomposes area-specific resistance (ASR) growth into cycle-induced fatigue and time-dependent electrochemical aging and apply it across six NSR duty-cycle scenarios spanning f = 1–27 cycles/month. Posterior inference via the No-U-Turn Sampler (NUTS) yields 17 estimated parameters meeting standard convergence criteria (R^ ≤ 1.01, ESSbulk ≥ 479, zero divergent transitions). The analysis identifies a failure-mode transition at f ≈ 3–6 cycles/month: high-frequency routes are crack-dominated (S1a: 10/15 cells fail by crack within the 600-cycle window with 5/15 right-censored), whereas low-frequency routes are ASR-dominated (S3b: 100% ASR). Global sensitivity analysis indicates the time-dependent rate coefficient ktime as the primary remaining-useful-life driver (ST = 0.37–0.46). Cycle-based maintenance thresholds span 160 cycles (S3b) to ≥600 cycles (S2b), bracketed by S1a (270 cycles, 10.0 months, crack-dominant) and S3a (480 cycles, 160 months, transition regime); qualitative consistency with published experimental data supports physical plausibility. Full article
(This article belongs to the Special Issue Sustainable Design and Structural Integrity of Eco-Friendly Ships and Offshore Structures)
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15 pages, 2418 KB  
Article
Structural Assessment of an IMO Type C Tank for Liquefied CO2 Storage Under Classification Rule-Based Load Conditions
by Youngkyun Seo and Jaemin Lee
J. Mar. Sci. Eng. 2026, 14(9), 821; https://doi.org/10.3390/jmse14090821 - 29 Apr 2026
Cited by 1 | Viewed by 967
Abstract
This study presents a structural integrity evaluation of a 5000 m3 IMO Type C independent tank designed for storing liquefied carbon dioxide (LCO2) at −35 °C and 15 barg, based on the IMO IGC Code and Korean Register (KR) rules. [...] Read more.
This study presents a structural integrity evaluation of a 5000 m3 IMO Type C independent tank designed for storing liquefied carbon dioxide (LCO2) at −35 °C and 15 barg, based on the IMO IGC Code and Korean Register (KR) rules. A finite element model was developed to assess structural responses under representative load cases considering thermal contraction, internal pressure, and ship-induced accelerations. The results show that structural design is predominantly governed by the internal pressure associated with liquefaction conditions and boil-off gas (BOG) accumulation, rather than the minimum design pressure specified by classification rules or liquid head pressure. As a result, the required tank thickness approaches the upper practical limit (approximately 50 mm), leading to inherently sufficient buckling resistance without additional design constraints. These findings indicate that, under medium-pressure LCO2 storage conditions, Type C tank design is primarily pressure-driven, and structural stability can be effectively ensured through thickness design. The study provides practical insights into governing design factors for rule-based tank design and highlights key considerations for LCO2 storage applications. Full article
(This article belongs to the Special Issue Sustainable Design and Structural Integrity of Eco-Friendly Ships and Offshore Structures)
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25 pages, 3694 KB  
Article
Thermodynamic Analysis and Economic Evaluation of a CO2 Re-Liquefaction System Utilizing Cold Energy of Alternative Marine Fuels
by Jeongje Park, Yeeun Joo, Jungho Choi and Wongwan Jung
J. Mar. Sci. Eng. 2026, 14(7), 636; https://doi.org/10.3390/jmse14070636 - 30 Mar 2026
Viewed by 772
Abstract
This study proposes a CO2 re-liquefaction system utilizing the cold energy of LNG and liquid hydrogen (LH2) to efficiently manage boil-off gas in alternative fuel-based CO2 carriers. Process simulations using Aspen HYSYS V11 under 100% and 70% propulsion loads [...] Read more.
This study proposes a CO2 re-liquefaction system utilizing the cold energy of LNG and liquid hydrogen (LH2) to efficiently manage boil-off gas in alternative fuel-based CO2 carriers. Process simulations using Aspen HYSYS V11 under 100% and 70% propulsion loads evaluated the Specific Energy Consumption (SEC), Coefficient of Performance (COP), UA of heat exchangers, and Specific Life Cycle Cost (SLCC). The results demonstrate that under both 100% and 70% propulsion load conditions, the utilization of cold energy decreases the SEC by 24.5% and improves the COP by approximately 34% compared to the reference model without cold energy utilization. Sensitivity analysis on the minimum temperature approach indicates limited impact on performance. The UA of the heat exchangers decreased by up to 83% (LNG) and 87% (LH2), offering significant downsizing advantages. Economically, SLCC was reduced by up to 14.8% and 15.9% for the LNG and H2 models, respectively, due to lower Capital Expenditure (CAPEX) and Operating Expenditure (OPEX). Consequently, this study demonstrates that exploiting the cold energy of alternative fuels significantly improves both the thermodynamic performance and economic feasibility of CO2 re-liquefaction systems, providing foundational data for future optimization. Full article
(This article belongs to the Special Issue Sustainable Design and Structural Integrity of Eco-Friendly Ships and Offshore Structures)
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