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Safety Assessment of Ships and Offshore Structures under Severe Condition
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Safety Assessment of Ships and Offshore Structures under Severe Condition

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (30 September 2020) | Viewed by 13913

Special Issue Editor

Professor Dr. Hirotada Hashimoto

E-Mail Website
Guest Editor
Division of Aerospace and Marine System Engineering, Osaka Prefecture University, Sakai, Japan
Interests: safety assessment of ships and offshore structures; intelligent systems for marine transportation; autonomous underwater vehicles for ocean-bottom exploration; tsunami maritime disaster prevention

Special Issue Information

Dear Colleagues,

Safety assessment of ships and offshore structures is a fundamental requirement for their design and actual operation at sea. However, it is still a challenging problem especially under severe environmental conditions, e.g., extreme winds and waves and green water. In addition, ships and offshore structures could encounter collision, flooding, and fire accidents as well as structural damages during their long-term operation at sea. Nowadays, safety for ships operating in polar waters is attracting attention from the shipping industry. Ship safety under tsunami attack is also a concern to be addressed. This Special Issue invites all contributions in connection with safety assessments of ships and offshore structures exposed to severe conditions. The severe conditions may include the following:

  • Extreme winds and waves
  • Green water and water on deck
  • Collision, grounding, and drifting
  • Fire and flooding
  • Passenger evacuation
  • Structural damages
  • Polar waters and ice
  • Tsunami attack

Professor Dr. Hirotada Hashimoto
Guest Editor

 

Keywords

  • Methodology
  • Numerical methods
  • Experimental methods
  • CFD simulation
  • Verification and validation
  • Deterministic and stochastic approach
  • Countermeasures/risk control options

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Published Papers (5 papers)

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15 pages, 4074 KiB  
Article
Explicit Time-Domain Approach for Random Vibration Analysis of Jacket Platforms Subjected to Wave Loads
by Wei Lin, Cheng Su and Youhong Tang
J. Mar. Sci. Eng. 2020, 8(12), 1001; https://doi.org/10.3390/jmse8121001 - 8 Dec 2020
Cited by 2 | Viewed by 2114
Abstract
This paper is devoted to the random vibration analysis of jacket platforms under wave loads using the explicit time-domain approach. The Morison equation is first used to obtain the nonlinear random wave loads, which are discretized into random loading vectors at a series [...] Read more.
This paper is devoted to the random vibration analysis of jacket platforms under wave loads using the explicit time-domain approach. The Morison equation is first used to obtain the nonlinear random wave loads, which are discretized into random loading vectors at a series of time instants. The Newmark-β integration scheme is then employed to construct the explicit expressions for dynamic responses of jacket platforms in terms of the random vectors at different time instants. On this basis, Monte Carlo simulation can further be conducted at high efficiency, which not only provides the statistical moments of the random responses, but also gives the mean peak values of responses. Compared with the traditional power spectrum method, nonlinear wave loads can be readily taken into consideration in the present approach rather than using the equivalent linearized Morison equation. Compared with the traditional Monte Carlo simulation, the response statistics can be obtained through the direct use of the explicit expressions of dynamic responses rather than repeatedly solving the equation of motion. An engineering example is analyzed to illustrate the accuracy and efficiency of the present approach. Full article
(This article belongs to the Special Issue Safety Assessment of Ships and Offshore Structures under Severe Condition)
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11 pages, 3269 KiB  
Article
Numerical Modeling of Fire Resistance Test as a Tool to Design Lightweight Marine Fire Doors: A Preliminary Study
by Giada Kyaw Oo D’Amore, Alberto Marinò and Jan Kašpar
J. Mar. Sci. Eng. 2020, 8(7), 520; https://doi.org/10.3390/jmse8070520 - 15 Jul 2020
Cited by 6 | Viewed by 3128
Abstract
Finite element analysis (FEA) is employed to simulate the thermo-resistance of a marine fire-proof door in the fire-resistance test defined by the International Code for the Application of Fire Test Procedures (2010 FTP Code) and required by the International Maritime Organization (IMO) for [...] Read more.
Finite element analysis (FEA) is employed to simulate the thermo-resistance of a marine fire-proof door in the fire-resistance test defined by the International Code for the Application of Fire Test Procedures (2010 FTP Code) and required by the International Maritime Organization (IMO) for marine applications. The appropriate type of simulation adopted (i.e., steady or unsteady) is discriminated on the basis of a comparison between the numerical results and the experimental data. This appropriate model is used to evaluate the critical parameters affecting fire-proof door performance. A remarkable role of the thermal bridge at the door edges in fire resistance is assessed, along with the parameters that allow its reduction. These findings provide insight into how to design a thinner and lighter fire door. Full article
(This article belongs to the Special Issue Safety Assessment of Ships and Offshore Structures under Severe Condition)
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17 pages, 4933 KiB  
Article
Risk Analysis of Marine Environmental Elements Based on Kendall Return Period
by Yuanxin Li and Guilin Liu
J. Mar. Sci. Eng. 2020, 8(6), 393; https://doi.org/10.3390/jmse8060393 - 29 May 2020
Cited by 2 | Viewed by 2180
Abstract
Against the background of global warming and rising sea levels, the threat of typhoon disasters to marine engineering structures has become increasingly serious. Therefore, the research on the design standards of marine environmental elements has become an important topic. In this study, two-dimensional [...] Read more.
Against the background of global warming and rising sea levels, the threat of typhoon disasters to marine engineering structures has become increasingly serious. Therefore, the research on the design standards of marine environmental elements has become an important topic. In this study, two-dimensional joint distributions of wave height and surge height, surge height and wind speed, and wave height and wind speed were constructed based on the Gumbel–Hougaard (G-H) Copula function according to the data of marine environmental elements under extreme sea conditions from Naozhou observation station in the sea waters of western Guangdong, and the Kendall return period is introduced. The joint return periods, co-occurrence return periods, and Kendall return periods of joint distributions were calculated, along with the latter’s corresponding design values of environmental elements. The results showed that the Kendall return periods and the corresponding design values are between two kinds of traditional return periods. After analysis, the conclusion is that the Kendall return period can reflect the occurrence regularity of marine hydrological events more accurately, and the design values of marine environmental elements calculated under this standard can reasonably lower the investment under the premise of ensuring structural safety. Therefore, the Kendall return period can serve as the new selection for marine engineering design and risk management. Full article
(This article belongs to the Special Issue Safety Assessment of Ships and Offshore Structures under Severe Condition)
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21 pages, 9156 KiB  
Article
Manoeuvrability of a Large Cruise Ship after Damage for Safe Return to Port
by Tetsuhiro Yuura, Hirotada Hashimoto and Akihiko Matsuda
J. Mar. Sci. Eng. 2020, 8(5), 378; https://doi.org/10.3390/jmse8050378 - 25 May 2020
Cited by 2 | Viewed by 3114
Abstract
Free-running model tests were conducted using a scaled model of a large cruise ship with a damaged compartment, to investigate the effects of damage opening and floodwater on the manoeuvring performance in calm water and regular and irregular head waves. Drifting tests in [...] Read more.
Free-running model tests were conducted using a scaled model of a large cruise ship with a damaged compartment, to investigate the effects of damage opening and floodwater on the manoeuvring performance in calm water and regular and irregular head waves. Drifting tests in regular beam waves were also performed. The experimental results indicated that the course-keeping ability in waves and turning ability became worse in the damaged condition. However, the target ship retained its manoeuvrability for safe return to the port, on its own, even in a damaged state. As it is time- and cost-consuming to conduct a free-running model experiment, a captive model test was also carried out to develop a system-based simulation model for evaluating the manoeuvrability of large cruise ships after damage. Full article
(This article belongs to the Special Issue Safety Assessment of Ships and Offshore Structures under Severe Condition)
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23 pages, 6530 KiB  
Article
Ultimate Limit State Function and Its Fitting Method of Damaged Ship under Combined Loads
by Zhiyao Zhu, Huilong Ren, Chenfeng Li and Xueqian Zhou
J. Mar. Sci. Eng. 2020, 8(2), 117; https://doi.org/10.3390/jmse8020117 - 14 Feb 2020
Cited by 6 | Viewed by 2670
Abstract
The ultimate limit state function is one of the premises for the assessment of structure strength and the safety of ships under severe conditions. In order to study the residual strength of damaged ships under the combined load of vertical and horizontal bending [...] Read more.
The ultimate limit state function is one of the premises for the assessment of structure strength and the safety of ships under severe conditions. In order to study the residual strength of damaged ships under the combined load of vertical and horizontal bending moments acting on the hull girder, the ultimate limit state function of a damaged ship under combined load, and its fitting methods are investigated in this paper. An improved Smith Method is adopted to calculate the residual load carrying capacity of damage ships, where the rotation and translation of the neutral axis of the damaged cross-section are obtained using a particle swarm optimisation method. Because the distribution curve of the residual load carrying capacity of a damaged ship under combined load is asymmetric, the application of traditional explicit polynomial fitting methods results in poor accuracy. In this study, a piecewise weighted least square fitting method is adopted so as to guarantee the continuity in the transitions, and a method is proposed for fitting the ultimate limit state function of a damaged ship under combined load. Calculations of the residual strength show that the improved Smith Method is more accurate than the original Smith Method for the accurate position of the neutral axis. The error analysis of the fitting methods shows that the ultimate limit state function that is fitted using a piecewise weight least square method is more accurate. Full article
(This article belongs to the Special Issue Safety Assessment of Ships and Offshore Structures under Severe Condition)
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