Pub Date : 2023-02-07DOI: 10.5750/ijme.v164ia3.725
Birgül Arslanoğlu, Gizem Elidolu, Tayfun Uyanık
Purpose - This study aims to predict seafarer safety perceptions and evaluate their feedbacks in order to understand the human factor on ship’s safety. Design/methodology/approach - A questionnaire survey has been conducted with 304 seafarers' participation and they responded several safety climate and perception indicators that based on literature, for instance safety assessment of supervisors and company, company's training arrangement, accident and near miss reporting etc. Scores of survey results have been estimated with four machine learning algorithms, namely as multiple linear regression, support vector regression, random forest and decision tree regression. Findings - The multiple linear regression method gave the best prediction performance for seafarer safety perception level with 4.07 mean absolute percentage error. Originality - It was seen that the machine learning techniques can be applicable in the prediction of seafarer safety perception based on collected data. This study may provide useful perspectives for maritime companies in the improving safety on ships.
{"title":"APPLICATION OF MACHINE LEARNING METHODS FOR PREDICTION OF SEAFARER SAFETY PERCEPTION","authors":"Birgül Arslanoğlu, Gizem Elidolu, Tayfun Uyanık","doi":"10.5750/ijme.v164ia3.725","DOIUrl":"https://doi.org/10.5750/ijme.v164ia3.725","url":null,"abstract":"Purpose - This study aims to predict seafarer safety perceptions and evaluate their feedbacks in order to understand the human factor on ship’s safety. \u0000Design/methodology/approach - A questionnaire survey has been conducted with 304 seafarers' participation and they responded several safety climate and perception indicators that based on literature, for instance safety assessment of supervisors and company, company's training arrangement, accident and near miss reporting etc. Scores of survey results have been estimated with four machine learning algorithms, namely as multiple linear regression, support vector regression, random forest and decision tree regression. \u0000Findings - The multiple linear regression method gave the best prediction performance for seafarer safety perception level with 4.07 mean absolute percentage error. \u0000Originality - It was seen that the machine learning techniques can be applicable in the prediction of seafarer safety perception based on collected data. This study may provide useful perspectives for maritime companies in the improving safety on ships.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42543467","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 : 2023-02-07DOI: 10.5750/ijme.v164ia3.1153
Wei Zhou, Cheng Fang
As a main force of ocean shipping, the energy consumption of container ships is considerably high due to the frequent load shifts of main engine and other disturbances. In this study, for engine room power systems in intelligent container ships, including cooling water subsystems, fuel oil subsystems, and main engine subsystems, a coordinated control scheme based on a correlation model and a distributed model predictive control approach was proposed to reduce continual fluctuations of control and output values through optimisation in a negotiated manner. The correlation model considers the interconnections among the subsystems, and the control approach achieves Nash equilibrium solutions. A comparative simulation was carried out between the proposed method and the decentralized model predictive control. The result shows that the proposed method works better than the decentralized one with less fluctuations. This study provides a theoretical basis for integrated designs of power control systems in intelligent container ships.
{"title":"Distributed Scheme for Main Engine Power Control Systems of Small and Medium Sized Container Ships Based on Nash Equilibrium","authors":"Wei Zhou, Cheng Fang","doi":"10.5750/ijme.v164ia3.1153","DOIUrl":"https://doi.org/10.5750/ijme.v164ia3.1153","url":null,"abstract":"As a main force of ocean shipping, the energy consumption of container ships is considerably high due to the frequent load shifts of main engine and other disturbances. In this study, for engine room power systems in intelligent container ships, including cooling water subsystems, fuel oil subsystems, and main engine subsystems, a coordinated control scheme based on a correlation model and a distributed model predictive control approach was proposed to reduce continual fluctuations of control and output values through optimisation in a negotiated manner. The correlation model considers the interconnections among the subsystems, and the control approach achieves Nash equilibrium solutions. A comparative simulation was carried out between the proposed method and the decentralized model predictive control. The result shows that the proposed method works better than the decentralized one with less fluctuations. This study provides a theoretical basis for integrated designs of power control systems in intelligent container ships.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45433409","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 : 2023-02-07DOI: 10.5750/ijme.v164ia3.793
Kyoung-Woo Lee, Gil-Yong Han, Jang-Won Seo, Jae-hyuk Choi, Manneung Kim
In this study, the bilge pumping performance was investigated using the actual bilge pumping arrangement of a 180K class bulk carrier, and it was assumed that the No. 1 cargo hold was fully flooded. As a result of the calculation, the mean water velocity at bilge main could not satisfy the 2m/s requirement while discharging all the accumulated water from the flooded No. 1 cargo hold with the actual arrangement installed on the 180K class bulk carrier. As a result of the calculation by modified arrangement, it was found that the 2 m/s requirement could be satisfied when a pipe smaller than the required internal diameter according to the rule requirements of classification societies was applied to the bilge main under the same pump conditions. In addition, it was found that the flow rate of the pump should be increased by at least 40% when piping acceptable for the rule requirements of classification societies was applied to the bilge main. The bilge pumping system of 180K bulk carriers may be similar for every ship, and in our opinion, urgent modifications and repair are necessary for consideration of the characteristics of bulk carriers with a relatively high risk of flooding. According to the GBS structure, the rule requirements of classification societies regarding bilge pumping system should comply with the intended purpose of SOLAS Regulation II-1/35-1. It is proposed to revise SOLAS Regulation II-1/35-1 by applying the concept of Performance-Based Standard (PBS) in order to secure the performance of the bilge pumping system by applying a pipe smaller than the required internal diameter according to the rule requirement of classification societies. In particular, it is proposed that SOALS Regulation II-1/35-1.3.9, the requirement for the required internal diameter of bilge main, should be deleted so that any size pipe can be used if the bilge pumping performance can satisfy the 2 m/s requirement. Finally, “2 m/s Criterion” is proposed only design criteria to fulfill the intended purpose of the 2 m/s requirement of SOLAS.
{"title":"PROPOSED DESIGN CRITERIA FOR A BILGE PUMPING SYSTEM: A CASE STUDY OF LARGE BULK CARRIER","authors":"Kyoung-Woo Lee, Gil-Yong Han, Jang-Won Seo, Jae-hyuk Choi, Manneung Kim","doi":"10.5750/ijme.v164ia3.793","DOIUrl":"https://doi.org/10.5750/ijme.v164ia3.793","url":null,"abstract":"In this study, the bilge pumping performance was investigated using the actual bilge pumping arrangement of a 180K class bulk carrier, and it was assumed that the No. 1 cargo hold was fully flooded. As a result of the calculation, the mean water velocity at bilge main could not satisfy the 2m/s requirement while discharging all the accumulated water from the flooded No. 1 cargo hold with the actual arrangement installed on the 180K class bulk carrier. As a result of the calculation by modified arrangement, it was found that the 2 m/s requirement could be satisfied when a pipe smaller than the required internal diameter according to the rule requirements of classification societies was applied to the bilge main under the same pump conditions. In addition, it was found that the flow rate of the pump should be increased by at least 40% when piping acceptable for the rule requirements of classification societies was applied to the bilge main. The bilge pumping system of 180K bulk carriers may be similar for every ship, and in our opinion, urgent modifications and repair are necessary for consideration of the characteristics of bulk carriers with a relatively high risk of flooding. According to the GBS structure, the rule requirements of classification societies regarding bilge pumping system should comply with the intended purpose of SOLAS Regulation II-1/35-1. It is proposed to revise SOLAS Regulation II-1/35-1 by applying the concept of Performance-Based Standard (PBS) in order to secure the performance of the bilge pumping system by applying a pipe smaller than the required internal diameter according to the rule requirement of classification societies. In particular, it is proposed that SOALS Regulation II-1/35-1.3.9, the requirement for the required internal diameter of bilge main, should be deleted so that any size pipe can be used if the bilge pumping performance can satisfy the 2 m/s requirement. Finally, “2 m/s Criterion” is proposed only design criteria to fulfill the intended purpose of the 2 m/s requirement of SOLAS.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48498930","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.1170
Dr P Loscombe
The Nordic longships of the 9th to 11th Centuries were perhaps the preeminent fast assault ships of the period. Modern engineering analytical tools have been employed from time to time to investigate their stability, performance and structural characteristics. The latter is perhaps the most challenging, since the physical problem is that of a hydro-elastic body in rough seas, constructed of a material with highly variable mechanical properties, fastened together by rivets, treenails, nails, spikes, lashings and wedges of uncertain joint efficiency. The corresponding analysis is potentially considerably more complex than the ‘linked-chain’ method commonly employed in modern design offices to establish acceptable scantlings, i.e. classification society rule loads and criteria together with reliable published material property data which are the essential inputs to scantling formulae/finite element analyses (FEA). This paper outlines one small craft naval architect’s view of the issues involved in applying the standard structural design method to the analysis of a ship type which is radically different from modern craft and in so doing identify issues which may be of interest to modern naval architects analysing unconventional lightweight structures.
{"title":"Analysing Ancient (Viking) Longship Structures","authors":"Dr P Loscombe","doi":"10.5750/ijme.v164ia2.1170","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.1170","url":null,"abstract":"The Nordic longships of the 9th to 11th Centuries were perhaps the preeminent fast assault ships of the period. Modern engineering analytical tools have been employed from time to time to investigate their stability, performance and structural characteristics. The latter is perhaps the most challenging, since the physical problem is that of a hydro-elastic body in rough seas, constructed of a material with highly variable mechanical properties, fastened together by rivets, treenails, nails, spikes, lashings and wedges of uncertain joint efficiency. The corresponding analysis is potentially considerably more complex than the ‘linked-chain’ method commonly employed in modern design offices to establish acceptable scantlings, i.e. classification society rule loads and criteria together with reliable published material property data which are the essential inputs to scantling formulae/finite element analyses (FEA). This paper outlines one small craft naval architect’s view of the issues involved in applying the standard structural design method to the analysis of a ship type which is radically different from modern craft and in so doing identify issues which may be of interest to modern naval architects analysing unconventional lightweight structures.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46228338","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.1175
Casper van Lynden, I. van Winsen, C. Westland, A. Kana
To reach the sustainable targets and to reduce the investment risk, there is a need for more certainty and predictability regarding the requirements of the future offshore wind installation vessels. To capture the fast changing offshore wind market and its impact on vessel requirements, this paper generates scenarios using Epoch-era analysis. A parametric model is created to determine the performance of a set of vessels defined by their length, beam, depth, crane capacity, speed, and transport strategy in the different scenarios. The strength of combining Epoch-era analysis and parametric modelling is that the performance criteria and input variables can be tailor-made to a stakeholders strategy resulting in robust input variables for the concept vessel design.
{"title":"Offshore Wind Installation Vessels","authors":"Casper van Lynden, I. van Winsen, C. Westland, A. Kana","doi":"10.5750/ijme.v164ia2.1175","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.1175","url":null,"abstract":"To reach the sustainable targets and to reduce the investment risk, there is a need for more certainty and predictability regarding the requirements of the future offshore wind installation vessels. To capture the fast changing offshore wind market and its impact on vessel requirements, this paper generates scenarios using Epoch-era analysis. A parametric model is created to determine the performance of a set of vessels defined by their length, beam, depth, crane capacity, speed, and transport strategy in the different scenarios. The strength of combining Epoch-era analysis and parametric modelling is that the performance criteria and input variables can be tailor-made to a stakeholders strategy resulting in robust input variables for the concept vessel design.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43107120","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.1231
OC Astrup, O. Aae, T. Kus, O. Uyanik, B. Biterling, T. Bars, M. Polini, V. G, K. Yu, T. Seppälä, M. Son
Shipyards and classification societies must modify the traditional design documentation and review process and enable a direct 3D digital classification process to improve the exchange of information between the different stakeholders and ultimately accelerate the classification process. The Open Class 3D Exchange (OCX) standard represents a step-change in this context. The OCX is a vessel-specific standard addressing the information needs of the classification society and is a key enabler to replace traditional 2D class drawings with a 3D model. The successful and seamless exchange of the design models exported from 4 independent 3D CAD systems to the classification society’s rule calculation tool has been demonstrated. The application of the OCX models for the prescriptive rule calculations demonstrates that the OCX model can carry all the information required by the classification society’s Rules for this purpose. The possibility to also display the detailed features of the design model in a neutral web-based viewer provides the necessary capability for full visual verification of the design models.
{"title":"Moving Towards Model Based Approval – The Open Class 3D Exchange (OCX) Standard","authors":"OC Astrup, O. Aae, T. Kus, O. Uyanik, B. Biterling, T. Bars, M. Polini, V. G, K. Yu, T. Seppälä, M. Son","doi":"10.5750/ijme.v164ia2.1231","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.1231","url":null,"abstract":"Shipyards and classification societies must modify the traditional design documentation and review process and enable a direct 3D digital classification process to improve the exchange of information between the different stakeholders and ultimately accelerate the classification process. The Open Class 3D Exchange (OCX) standard represents a step-change in this context. The OCX is a vessel-specific standard addressing the information needs of the classification society and is a key enabler to replace traditional 2D class drawings with a 3D model. The successful and seamless exchange of the design models exported from 4 independent 3D CAD systems to the classification society’s rule calculation tool has been demonstrated. The application of the OCX models for the prescriptive rule calculations demonstrates that the OCX model can carry all the information required by the classification society’s Rules for this purpose. The possibility to also display the detailed features of the design model in a neutral web-based viewer provides the necessary capability for full visual verification of the design models.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42142070","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.792
Onder Erkarslan, Burcin Asici
The study aims to contribute to the literature by comprehensively discussing the importance of design methods to the company's competence in the commercial world and the importance of integrating design into the product development process in the early stages. The driver environment on today's boats is not ergonomically designed and this project aimed to design a new driver environment with improved ergonomics, user experience and aesthetically compelling for the market. The project was conducted with a user-centred design methodology, meaning that all team members were involved throughout the product development process to create design value for users with new solutions that meet their needs. The result is a new console, seating unit and hardtop design that takes into account the importance of ergonomics, user experience and manufacturability. These elements have not only integrated all the equipment in a user-friendly way, but also with easy maintenance and manufacturing options.
{"title":"DESIGN OF DRIVER ENVIRONMENT FOR RIGID INFLATABLE BOAT (RIB) WITH FOCUS ON USER-CENTRED DESIGN (UCD)","authors":"Onder Erkarslan, Burcin Asici","doi":"10.5750/ijme.v164ia2.792","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.792","url":null,"abstract":"The study aims to contribute to the literature by comprehensively discussing the importance of design methods to the company's competence in the commercial world and the importance of integrating design into the product development process in the early stages. The driver environment on today's boats is not ergonomically designed and this project aimed to design a new driver environment with improved ergonomics, user experience and aesthetically compelling for the market. The project was conducted with a user-centred design methodology, meaning that all team members were involved throughout the product development process to create design value for users with new solutions that meet their needs. The result is a new console, seating unit and hardtop design that takes into account the importance of ergonomics, user experience and manufacturability. These elements have not only integrated all the equipment in a user-friendly way, but also with easy maintenance and manufacturing options.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48945994","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.768
A. Elkafas, M. Rivarolo, A. Massardo
Ship emissions reduction targets are pushing the maritime industry towards more sustainable and cleaner energy solutions. Marine fuels play a major role in this because of the emissions resulting from the combustion process associated with the prime mover(s), therefore, one of the technical solutions is to replace conventional marine fuels with cleaner fuels. Hence the aim of this study is to undertake environmental, technical, and economic analysis of alternative fuels to reduce the environmental footprint and lifetime costs of the long-distance shipping sector. As a case study, an ultra large container ship operating on the East-West trade route has been considered, and the analysis focus ed on natural gas and methanol as alternative fuels. This study adopted three approaches : environmental, technical, and economic methods to compare the alternative fuels with the conventional ones. The results showed that a dual-fuel engine operated by natural gas will reduce CO2, SOx, and NOx emissions by 28%, 98% and 85%, respectively , when compared with emission values for a diesel-powered engine. Furthermore, the reduction percentages reach 7%, 95% and 80% when using a dual-fuel engine operated by methanol, respectively. The proposed dual-fuel engines will improve the ship energy efficiency index by 26% and 7%, respectively. The study shows that methanol is the most economical alternative fuel for this container ship, replacing diesel with methanol, leads to a power system that is only 30% more expensive than the existing one. The analysis confirms that the cost of fuel has a major effect on the ship’s life cycle cost and that by reducing the fuel costs, the costs of the power system become more acceptable.
{"title":"Assessment Of Alternative Marine Fuels from Environmental, Technical, and Economic Perspectives Onboard Ultra Large Container Ship","authors":"A. Elkafas, M. Rivarolo, A. Massardo","doi":"10.5750/ijme.v164ia2.768","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.768","url":null,"abstract":"Ship emissions reduction targets are pushing the maritime industry towards more sustainable and cleaner energy solutions. Marine fuels play a major role in this because of the emissions resulting from the combustion process associated with the prime mover(s), therefore, one of the technical solutions is to replace conventional marine fuels with cleaner fuels. Hence the aim of this study is to undertake environmental, technical, and economic analysis of alternative fuels to reduce the environmental footprint and lifetime costs of the long-distance shipping sector. As a case study, an ultra large container ship operating on the East-West trade route has been considered, and the analysis focus ed on natural gas and methanol as alternative fuels. This study adopted three approaches : environmental, technical, and economic methods to compare the alternative fuels with the conventional ones. The results showed that a dual-fuel engine operated by natural gas will reduce CO2, SOx, and NOx emissions by 28%, 98% and 85%, respectively , when compared with emission values for a diesel-powered engine. Furthermore, the reduction percentages reach 7%, 95% and 80% when using a dual-fuel engine operated by methanol, respectively. The proposed dual-fuel engines will improve the ship energy efficiency index by 26% and 7%, respectively. The study shows that methanol is the most economical alternative fuel for this container ship, replacing diesel with methanol, leads to a power system that is only 30% more expensive than the existing one. The analysis confirms that the cost of fuel has a major effect on the ship’s life cycle cost and that by reducing the fuel costs, the costs of the power system become more acceptable.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47502248","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.811
Yaru Yu, Z. Kok, S. Chai, H. Enshaei, M. Woodward
Predicting a vessel’s motion response is important for the design as well as evaluating its operability and sustainability. This is often performed in towing tanks through captive model tests in towing tanks. However, discrepancies exist between model-scale and full-scale results. Besides, quite often, the wind is not included in the test, resulting in unrealistic assumptions of static pressure and constant heeling lever from the wind. This paper presents a study on transverse stability under wind, waves, and lifting conditions, incorporating several series of URANS-based simulations in model-scale and full-scale. According to the results, scaling effects accounts for about 3~15% in terms of roll amplitudes and it seems to be both frictional-force-related and wave-frequency-dependent. Wind force exerts limited influence on the vessel’s transverse stability, however, in waves especially for longer wavelength, a wind of 25 m/s increases the roll amplitude up to 53% and it appears to be wave frequency-dependant. The correlation between roll motion and wind/waves/lifting is complicated but their combination produces way more influence than any individual factor alone, indicating none of them should be neglected.
{"title":"Full-scale URANS prediction of a vessel's transverse stability in wind and waves under lifting condition","authors":"Yaru Yu, Z. Kok, S. Chai, H. Enshaei, M. Woodward","doi":"10.5750/ijme.v164ia2.811","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.811","url":null,"abstract":"Predicting a vessel’s motion response is important for the design as well as evaluating its operability and sustainability. This is often performed in towing tanks through captive model tests in towing tanks. However, discrepancies exist between model-scale and full-scale results. Besides, quite often, the wind is not included in the test, resulting in unrealistic assumptions of static pressure and constant heeling lever from the wind. This paper presents a study on transverse stability under wind, waves, and lifting conditions, incorporating several series of URANS-based simulations in model-scale and full-scale. According to the results, scaling effects accounts for about 3~15% in terms of roll amplitudes and it seems to be both frictional-force-related and wave-frequency-dependent. Wind force exerts limited influence on the vessel’s transverse stability, however, in waves especially for longer wavelength, a wind of 25 m/s increases the roll amplitude up to 53% and it appears to be wave frequency-dependant. The correlation between roll motion and wind/waves/lifting is complicated but their combination produces way more influence than any individual factor alone, indicating none of them should be neglected.","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49374738","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 : 2022-11-28DOI: 10.5750/ijme.v164ia2.782
Saeid Amani, A. Henderson, J. Mcvicar, J. Binns
Abstract The influence of wind on a ship’s manoeuvring performance has always been an important issue, particularly in a harbour environment and during the ship’s docking or disembarking. These types of ships have relatively shallow draft and a smaller cross-sectional area below the waterline compared with their above waterline area. It is therefore important that the designer has appropriate tools for accurate station keeping prediction. This paper presents aerodynamic coefficient estimates for a 112m high-speed wave piercing catamaran (built by Incat Tasmania) using RANS-based Computational Fluid Dynamics (CFD) and Experimental Fluid Dynamics (EFD) from wind tunnel testing. It demonstrates that CFD and EFD can be used to complement each other in quantifying the magnitude and effects of wind loading on a high-speed wave piercing catamaran. The results from CFD simulations correspond well with the wind tunnel experiments.
{"title":"PREDICTION OF WIND LOADS ON A HIGH-SPEED CATAMARAN DURING MANOEUVRING AT LOW SPEED","authors":"Saeid Amani, A. Henderson, J. Mcvicar, J. Binns","doi":"10.5750/ijme.v164ia2.782","DOIUrl":"https://doi.org/10.5750/ijme.v164ia2.782","url":null,"abstract":"Abstract \u0000The influence of wind on a ship’s manoeuvring performance has always been an important issue, particularly in a harbour environment and during the ship’s docking or disembarking. These types of ships have relatively shallow draft and a smaller cross-sectional area below the waterline compared with their above waterline area. It is therefore important that the designer has appropriate tools for accurate station keeping prediction. \u0000This paper presents aerodynamic coefficient estimates for a 112m high-speed wave piercing catamaran (built by Incat Tasmania) using RANS-based Computational Fluid Dynamics (CFD) and Experimental Fluid Dynamics (EFD) from wind tunnel testing. It demonstrates that CFD and EFD can be used to complement each other in quantifying the magnitude and effects of wind loading on a high-speed wave piercing catamaran. The results from CFD simulations correspond well with the wind tunnel experiments. \u0000 ","PeriodicalId":50313,"journal":{"name":"International Journal of Maritime Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41403914","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：