Pub Date : 2023-06-30DOI: 10.58771/joinmet.1307836
Kubilay Bayramoğlu
Reducing CO2 emissions from ships is regulated by the IMO due to global warming. The regulations aim to reduce carbon emissions gradually. This paper highlights the most recent developments for reducing carbon emissions from ships in compliance with the applicable regulations. Basically, three different techniques are used to reduce carbon emissions. These are the use of clean alternative fuels that do not contain carbon atoms, such as hydrogen and ammonia; the other is the use of ship propulsion systems that can be propelled by electricity; and finally, the use of carbon capture systems. As a result of the study, the potential, advantages, and disadvantages of the techniques used are mentioned. As a result of the study, it was found that carbon capture systems reduce carbon emissions by up to 90%. One of the findings is that CO2 emissions can be significantly reduced with appropriate storage practices.
{"title":"Gemilerde Karbonsuzlaştırma Tekniklerinin Değerlendirilmesi","authors":"Kubilay Bayramoğlu","doi":"10.58771/joinmet.1307836","DOIUrl":"https://doi.org/10.58771/joinmet.1307836","url":null,"abstract":"Reducing CO2 emissions from ships is regulated by the IMO due to global warming. The regulations aim to reduce carbon emissions gradually. This paper highlights the most recent developments for reducing carbon emissions from ships in compliance with the applicable regulations. Basically, three different techniques are used to reduce carbon emissions. These are the use of clean alternative fuels that do not contain carbon atoms, such as hydrogen and ammonia; the other is the use of ship propulsion systems that can be propelled by electricity; and finally, the use of carbon capture systems. As a result of the study, the potential, advantages, and disadvantages of the techniques used are mentioned. As a result of the study, it was found that carbon capture systems reduce carbon emissions by up to 90%. One of the findings is that CO2 emissions can be significantly reduced with appropriate storage practices.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"62 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85617283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.58771/joinmet.1295372
Refik Canimoğlu, U. Yildirim
Cultural diversity became a significant factor in seafarers’ operational performance onboard. Since ships are operated by multinational crew members, socializing, and understanding foreign cultures became crucial for seafarers working onboard multicultural ships. Diversity management is essential for achieving an effective workforce, as well as making these benefits visible and allowing the organization to leverage them as a competitive advantage. However, apart from its advantages, diversity brought some challenges such as communication errors and cultural misunderstandings. Considering the human element is the primary factor among the maritime accident causations, challenges caused by cultural diversity has the potential to cause a raise in maritime accidents. Crew management onboard multicultural ships should be rigorously carried out to limit unwanted impacts. Our study aims to have a better view on optimal seafarer profile suitable to work onboard ships having multicultural crew members. The prepared questionnaire was administered to interns and officers worked aboard multicultural ships for this purpose, and the findings were evaluated using independent t-test analysis.
{"title":"Gemilerde Kültür Çeşitliliği: Personel Özelliklerine Yönelik Bir Çalışma","authors":"Refik Canimoğlu, U. Yildirim","doi":"10.58771/joinmet.1295372","DOIUrl":"https://doi.org/10.58771/joinmet.1295372","url":null,"abstract":"Cultural diversity became a significant factor in seafarers’ operational performance onboard. Since ships are operated by multinational crew members, socializing, and understanding foreign cultures became crucial for seafarers working onboard multicultural ships. Diversity management is essential for achieving an effective workforce, as well as making these benefits visible and allowing the organization to leverage them as a competitive advantage. However, apart from its advantages, diversity brought some challenges such as communication errors and cultural misunderstandings. Considering the human element is the primary factor among the maritime accident causations, challenges caused by cultural diversity has the potential to cause a raise in maritime accidents. Crew management onboard multicultural ships should be rigorously carried out to limit unwanted impacts. Our study aims to have a better view on optimal seafarer profile suitable to work onboard ships having multicultural crew members. The prepared questionnaire was administered to interns and officers worked aboard multicultural ships for this purpose, and the findings were evaluated using independent t-test analysis.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"28 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83362318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.58771/joinmet.1291554
Begüm Doganay, Burak Çavuşoğlu, Ç. Güler
It is only possible for companies to maintain their position and advance in the competitive environment by preserving their quality and by developing and improving themselves. In this direction, they need to make quality measurements and analyses. For this purpose, more than one quality improvement method has been developed. One of the techniques for enhancing quality is the Failure Mode and Effect Analysis (FMEA) method. FMEA is an operations management and product development method that classifies failures according to similarity, probability, detectability, and severity to analyze potential failure types of a system. It is a technique that focuses on avoiding risks in products and processes during the production phase and documenting these activities. Its purpose is to prevent poor quality, address potential risks that may cause product defects, identify possible types of defects, and determine their consequences and severity. In this study, the bunkering operation between the fuel barge and a ship, the berthing and anchoring of the fuel barge, the fuel transfer process, the unberthing of the fuel barge, and the preparation for the voyage were handled in three stages and the hazards were defined for each stage. Bunkering operation hazards have been identified by using FMEA have been conducted to reduce operational risks, and suggestions have been made.
{"title":"GEMİLERDE YAKIT İKMALİ OPERASYONUNDA GERÇEKLEŞMESİ MUHTEMEL KAZALARIN HATA TÜRÜ VE ETKİLERİ ANALİZİ İLE AZALTILMA ÇALIŞMASI","authors":"Begüm Doganay, Burak Çavuşoğlu, Ç. Güler","doi":"10.58771/joinmet.1291554","DOIUrl":"https://doi.org/10.58771/joinmet.1291554","url":null,"abstract":"It is only possible for companies to maintain their position and advance in the competitive environment by preserving their quality and by developing and improving themselves. In this direction, they need to make quality measurements and analyses. For this purpose, more than one quality improvement method has been developed. One of the techniques for enhancing quality is the Failure Mode and Effect Analysis (FMEA) method. FMEA is an operations management and product development method that classifies failures according to similarity, probability, detectability, and severity to analyze potential failure types of a system. It is a technique that focuses on avoiding risks in products and processes during the production phase and documenting these activities. Its purpose is to prevent poor quality, address potential risks that may cause product defects, identify possible types of defects, and determine their consequences and severity. In this study, the bunkering operation between the fuel barge and a ship, the berthing and anchoring of the fuel barge, the fuel transfer process, the unberthing of the fuel barge, and the preparation for the voyage were handled in three stages and the hazards were defined for each stage. Bunkering operation hazards have been identified by using FMEA have been conducted to reduce operational risks, and suggestions have been made.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"220 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75098255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.58771/joinmet.1294204
Fatih Okumuş, Görkem Kökkülünk
Reducing nitrogen oxide (NOx) emissions is of great importance in terms of environmental sustainability and air quality. This study is a review that examines various applications aimed at reducing NOx emissions. Below is a summary of the evaluation of technologies, including the common rail system, exhaust gas recirculation (EGR), Miller cycle, direct water injection, emulsified fuel, and selective catalytic reduction (SCR). The common rail system, EGR, and Miller cycle can generally be considered as combustion control-based methods for reducing NOx within the cylinder. Direct water injection and emulsified fuel aim to lower temperatures inside the cylinder by utilizing the high internal heat of evaporation of water. Selective catalytic reduction is a technology where NOx in the exhaust gas is converted into nitrogen gas and water vapor through the use of a catalyst. This study evaluates the effectiveness and applicability of various technologies used to reduce NOx emissions. Each method may have different advantages and disadvantages. Additionally, there may be certain limitations and variations depending on the application areas of these methods. Therefore, a careful assessment is necessary to determine the most suitable technology or combination of technologies for reducing NOx emissions.
{"title":"Gemi Dizel Motorunda Azot Oksitleri (NOx) İndirgeme Yöntemlerinin İncelenmesi","authors":"Fatih Okumuş, Görkem Kökkülünk","doi":"10.58771/joinmet.1294204","DOIUrl":"https://doi.org/10.58771/joinmet.1294204","url":null,"abstract":"Reducing nitrogen oxide (NOx) emissions is of great importance in terms of environmental sustainability and air quality. This study is a review that examines various applications aimed at reducing NOx emissions. Below is a summary of the evaluation of technologies, including the common rail system, exhaust gas recirculation (EGR), Miller cycle, direct water injection, emulsified fuel, and selective catalytic reduction (SCR). The common rail system, EGR, and Miller cycle can generally be considered as combustion control-based methods for reducing NOx within the cylinder. Direct water injection and emulsified fuel aim to lower temperatures inside the cylinder by utilizing the high internal heat of evaporation of water. Selective catalytic reduction is a technology where NOx in the exhaust gas is converted into nitrogen gas and water vapor through the use of a catalyst. This study evaluates the effectiveness and applicability of various technologies used to reduce NOx emissions. Each method may have different advantages and disadvantages. Additionally, there may be certain limitations and variations depending on the application areas of these methods. Therefore, a careful assessment is necessary to determine the most suitable technology or combination of technologies for reducing NOx emissions.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"259 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77112475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-14DOI: 10.1080/20464177.2023.2223396
Jeong-Seok Lee, Yong-Ung Yu
Offshore wind farms have emerged as an effective method for responding to the energy crisis. However, offshore wind power generation has been indiscriminately planned at sea, leading to interference with the traffic routes of merchant ships. Many countries and organisations have set buffer zone standards to ensure the safe navigation of passing vessels, but these standards differ widely. As a typical example, the standards of the International Maritime Organization (IMO) and those of the Confederation of European Shipmasters’ Associations (CESMA) are used to decide the route widths of vessels; however, they both have limitations, preventing their application to all sea areas. This study proposes a novel methodology to calculate the width of a route using distribution and line density analyses of 90% and 50% maritime traffic. First, four categorised maritime routes and gate lines are established to comparatively analyse the width of maritime traffic routes. Next, to ensure reliability-based route safety, the compliance of extracted maritime traffic route widths with the criteria established by the IMO and CESMA is verified. The selection of optimised widths for vessel traffic routes will ensure the safe navigation of maritime traffic and encourage the sustainable development of maritime spaces.
{"title":"Calculation of categorical route width according to maritime traffic flow data in the Republic of Korea","authors":"Jeong-Seok Lee, Yong-Ung Yu","doi":"10.1080/20464177.2023.2223396","DOIUrl":"https://doi.org/10.1080/20464177.2023.2223396","url":null,"abstract":"Offshore wind farms have emerged as an effective method for responding to the energy crisis. However, offshore wind power generation has been indiscriminately planned at sea, leading to interference with the traffic routes of merchant ships. Many countries and organisations have set buffer zone standards to ensure the safe navigation of passing vessels, but these standards differ widely. As a typical example, the standards of the International Maritime Organization (IMO) and those of the Confederation of European Shipmasters’ Associations (CESMA) are used to decide the route widths of vessels; however, they both have limitations, preventing their application to all sea areas. This study proposes a novel methodology to calculate the width of a route using distribution and line density analyses of 90% and 50% maritime traffic. First, four categorised maritime routes and gate lines are established to comparatively analyse the width of maritime traffic routes. Next, to ensure reliability-based route safety, the compliance of extracted maritime traffic route widths with the criteria established by the IMO and CESMA is verified. The selection of optimised widths for vessel traffic routes will ensure the safe navigation of maritime traffic and encourage the sustainable development of maritime spaces.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"22 1","pages":"222 - 232"},"PeriodicalIF":2.6,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48067639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-22DOI: 10.1080/20464177.2023.2214985
D. Liang, Tianhua Xue, Weidong Zhong, W. Ao, Ke Ren, Yangxu Jiang, Yang Wang, D. Shen
Magnesium has received significant attention as a potential hydro-reactive metal particle fuel due to its superior ignition and combustion characteristics. In this work, a laser ignition testing system was designed for visualised combustion monitoring of moving magnesium particles with different average diameters. Combustion images were recorded and the effect of particle diameter on the combustion phenomena and combustion time were analysed. The statistical results show that the average combustion times are 4.5 ± 2.5, 15.2 ± 7.9, and 31.7 ± 17.9 ms for the magnesium particle fractions of 100, 150, and 200 µm, respectively. Moreover, a quasi-stable state, heterogeneous, and diffusion limited mathematical model was developed to describe the combustion process. In the model, a flame surface exists and divides the gas phase field between the particle surface and infinity into an internal zone and an external zone. Effects of particle relative movement on the heat transfer and external zone components were also considered.
{"title":"Visualised combustion monitoring and mathematical modelling for moving magnesium particles in water vapour flow","authors":"D. Liang, Tianhua Xue, Weidong Zhong, W. Ao, Ke Ren, Yangxu Jiang, Yang Wang, D. Shen","doi":"10.1080/20464177.2023.2214985","DOIUrl":"https://doi.org/10.1080/20464177.2023.2214985","url":null,"abstract":"Magnesium has received significant attention as a potential hydro-reactive metal particle fuel due to its superior ignition and combustion characteristics. In this work, a laser ignition testing system was designed for visualised combustion monitoring of moving magnesium particles with different average diameters. Combustion images were recorded and the effect of particle diameter on the combustion phenomena and combustion time were analysed. The statistical results show that the average combustion times are 4.5 ± 2.5, 15.2 ± 7.9, and 31.7 ± 17.9 ms for the magnesium particle fractions of 100, 150, and 200 µm, respectively. Moreover, a quasi-stable state, heterogeneous, and diffusion limited mathematical model was developed to describe the combustion process. In the model, a flame surface exists and divides the gas phase field between the particle surface and infinity into an internal zone and an external zone. Effects of particle relative movement on the heat transfer and external zone components were also considered.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"70 1","pages":"284 - 293"},"PeriodicalIF":2.6,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80892833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-13DOI: 10.1080/20464177.2023.2212441
Haochen Hong, Xianku Zhang, Zhongwen Huang
To solve the problems of difficult course keeping, high energy output, and large wear of very large ships under different sea conditions, a robust controller combining the closed-loop gain shaping algorithm and nonlinear decoration is proposed in this paper. Firstly, a linear controller is designed by using the third-order closed-loop gain shaping algorithm and takes the hyperbolic tangent function as the nonlinear decoration of the controller output, and the robustness of the system is proved by H∞ robust control theory. Secondly, taking ‘Vale Brasil’, an ore carrier with a displacement of 400,000 tons, as the test plant. The nonlinear Nomoto model and nonlinear Norrbin model were established, which were compared with the control effect from the existing controller. Thirdly, simulation experiments were carried out under normal sea state and heavy sea state to prove the effectiveness. The results indicate that the proposed control strategy can achieve the required course faster, and enhances the smoothness of rudder angle actuation compared with the existing controller. It can maintain good control ability under different sea conditions. The proposed controller has the advantages of simple parameter adjustment, better robustness, less energy consumption, and reduced rudder angle. It is more in line with engineering practice and increases ship operation benefits.
{"title":"Course keeping control for very large ship using hyperbolic tangent function based on nonlinear decoration technique","authors":"Haochen Hong, Xianku Zhang, Zhongwen Huang","doi":"10.1080/20464177.2023.2212441","DOIUrl":"https://doi.org/10.1080/20464177.2023.2212441","url":null,"abstract":"To solve the problems of difficult course keeping, high energy output, and large wear of very large ships under different sea conditions, a robust controller combining the closed-loop gain shaping algorithm and nonlinear decoration is proposed in this paper. Firstly, a linear controller is designed by using the third-order closed-loop gain shaping algorithm and takes the hyperbolic tangent function as the nonlinear decoration of the controller output, and the robustness of the system is proved by H∞ robust control theory. Secondly, taking ‘Vale Brasil’, an ore carrier with a displacement of 400,000 tons, as the test plant. The nonlinear Nomoto model and nonlinear Norrbin model were established, which were compared with the control effect from the existing controller. Thirdly, simulation experiments were carried out under normal sea state and heavy sea state to prove the effectiveness. The results indicate that the proposed control strategy can achieve the required course faster, and enhances the smoothness of rudder angle actuation compared with the existing controller. It can maintain good control ability under different sea conditions. The proposed controller has the advantages of simple parameter adjustment, better robustness, less energy consumption, and reduced rudder angle. It is more in line with engineering practice and increases ship operation benefits.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"22 1","pages":"213 - 221"},"PeriodicalIF":2.6,"publicationDate":"2023-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49209370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-12DOI: 10.1080/20464177.2023.2180831
L. Oneto, Jin Wang, D. Frangopol, S. Savio, Davide Anguita, M. Figari, F. Cipollini, G. Theotokatos
This study presents the state-of-art and future trends of the maintenance approaches to ship machinery systems. A systematic review process is conducted to identify relevant literature. Firstly, literature is examined by bibliometric analyses based on the determination of the distribution of papers by years, the top authors, papers, journals, and organisations. Then, studies in the literature are reviewed and presented. In addition, the advantages and difficulties of each maintenance strategy are discussed. Finally, an effective maintenance policy that can implement in new ship concepts such as autonomous marine vessels is introduced in line with the information from the literature. In the future, it is believed that maintenance practices will be performed via the condition-based approach when the evolution of followed maintenance operations in ship machinery systems is examined. However, it should be underlined that more effective and powerful maintenance management can be achieved by supporting the system performance monitoring with reliability and risk approaches.
{"title":"Review of maintenance strategies for ship machinery systems","authors":"L. Oneto, Jin Wang, D. Frangopol, S. Savio, Davide Anguita, M. Figari, F. Cipollini, G. Theotokatos","doi":"10.1080/20464177.2023.2180831","DOIUrl":"https://doi.org/10.1080/20464177.2023.2180831","url":null,"abstract":"This study presents the state-of-art and future trends of the maintenance approaches to ship machinery systems. A systematic review process is conducted to identify relevant literature. Firstly, literature is examined by bibliometric analyses based on the determination of the distribution of papers by years, the top authors, papers, journals, and organisations. Then, studies in the literature are reviewed and presented. In addition, the advantages and difficulties of each maintenance strategy are discussed. Finally, an effective maintenance policy that can implement in new ship concepts such as autonomous marine vessels is introduced in line with the information from the literature. In the future, it is believed that maintenance practices will be performed via the condition-based approach when the evolution of followed maintenance operations in ship machinery systems is examined. However, it should be underlined that more effective and powerful maintenance management can be achieved by supporting the system performance monitoring with reliability and risk approaches.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"22 1","pages":"233 - 247"},"PeriodicalIF":2.6,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60008214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-08DOI: 10.1080/20464177.2023.2197280
M. R. Tabeshpour, Navid Belvasi
Ocean waves are complex, irregular, and random, making it difficult to produce definitive and repetitive time-series that represent oceans worldwide. Researchers have attempted to develop wave spectrum models for different oceans to create reliable wave time series for use in time-domain simulations of marine structures. Accurately estimating wave time-series is especially important in the analysing of wave energy converters (WECs) to assess the applied forces on the device and achieve a reliable estimation of the efficiency of the power take-off apparatus at the design stage. Therefore, there is a need for a set of low- and mid-fidelity tools and models to estimate the relation between the wave spectra discretisation and the correct correspondence exceedance probabilities of the wave time-series. The present study aims to respond to this fundamental necessity with a probabilistic and statistical approach. Initially, the whole logical process of time series generation with fitting risk-level analysis is formulated and interpreted. Then, a relationship between the produced artificial time-series and different probabilities of exceedance is developed. Finally, a logical relationship between the required precision of an artificial ocean time-series and the optimal level of design risk is developed and discussed. The findings provide a framework where generated time-series has a relation with the level of design risk.
{"title":"Ocean waves time-series generation: minimum required artificial wave time-series for wave energy converter analysis","authors":"M. R. Tabeshpour, Navid Belvasi","doi":"10.1080/20464177.2023.2197280","DOIUrl":"https://doi.org/10.1080/20464177.2023.2197280","url":null,"abstract":"Ocean waves are complex, irregular, and random, making it difficult to produce definitive and repetitive time-series that represent oceans worldwide. Researchers have attempted to develop wave spectrum models for different oceans to create reliable wave time series for use in time-domain simulations of marine structures. Accurately estimating wave time-series is especially important in the analysing of wave energy converters (WECs) to assess the applied forces on the device and achieve a reliable estimation of the efficiency of the power take-off apparatus at the design stage. Therefore, there is a need for a set of low- and mid-fidelity tools and models to estimate the relation between the wave spectra discretisation and the correct correspondence exceedance probabilities of the wave time-series. The present study aims to respond to this fundamental necessity with a probabilistic and statistical approach. Initially, the whole logical process of time series generation with fitting risk-level analysis is formulated and interpreted. Then, a relationship between the produced artificial time-series and different probabilities of exceedance is developed. Finally, a logical relationship between the required precision of an artificial ocean time-series and the optimal level of design risk is developed and discussed. The findings provide a framework where generated time-series has a relation with the level of design risk.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"4 1","pages":"273 - 283"},"PeriodicalIF":2.6,"publicationDate":"2023-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81812692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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