Pub Date : 2023-12-29DOI: 10.1177/14750902231217357
U. Türker, Souhail Boulanoire
A series of quantitative analyses were performed to identify the wave properties and potential, by means of records collected from an offshore buoy in North-West Ireland. Based on the data collected, a series of quantitative analyses was conducted to determine the dominant wind directions and wave properties on an annual basis. In addition, the wave power is computed based on relevant wave heights and periods, and the Pierson-Moskowitz spectral model was used to generate the maximum wave energy spectra for each year. The results show that waves with wave powers of around 100 kW/m were mostly approaching eastward at a rather narrow frequency. In order to compare the relative capture width and the power absorption capacity of three floating structures, the Wave Dragon, Board Net Breakwater, and Cylindrical Floating Breakwater are analyzed. Also outlined is the impact of the transmission coefficient on the effectiveness of wave energy converters (WEC) throughout the energy harvesting process. This was accomplished by fusing information from three distinct field investigations and experimental research with four different wave transmission coefficient models. The results show that as the wave steepness increases, the transmission coefficient decreases and the hydrodynamic performance of wave energy converters increases. Also, it is found that the hydrodynamic efficiency of wave energy converters is higher in summer than in winter, and the Wave Dragon is the most efficient wave energy converter in regard to relative capture width and power absorption.
{"title":"Wave energy converter efficiency based on wave transmission and relative capture width performance","authors":"U. Türker, Souhail Boulanoire","doi":"10.1177/14750902231217357","DOIUrl":"https://doi.org/10.1177/14750902231217357","url":null,"abstract":"A series of quantitative analyses were performed to identify the wave properties and potential, by means of records collected from an offshore buoy in North-West Ireland. Based on the data collected, a series of quantitative analyses was conducted to determine the dominant wind directions and wave properties on an annual basis. In addition, the wave power is computed based on relevant wave heights and periods, and the Pierson-Moskowitz spectral model was used to generate the maximum wave energy spectra for each year. The results show that waves with wave powers of around 100 kW/m were mostly approaching eastward at a rather narrow frequency. In order to compare the relative capture width and the power absorption capacity of three floating structures, the Wave Dragon, Board Net Breakwater, and Cylindrical Floating Breakwater are analyzed. Also outlined is the impact of the transmission coefficient on the effectiveness of wave energy converters (WEC) throughout the energy harvesting process. This was accomplished by fusing information from three distinct field investigations and experimental research with four different wave transmission coefficient models. The results show that as the wave steepness increases, the transmission coefficient decreases and the hydrodynamic performance of wave energy converters increases. Also, it is found that the hydrodynamic efficiency of wave energy converters is higher in summer than in winter, and the Wave Dragon is the most efficient wave energy converter in regard to relative capture width and power absorption.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"7 24","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139147631","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}
Due to the marine environment, the operation efficiency of marine cranes is low, and it is easy to cause safety accidents. In this study, magnetorheological (MR) technology is applied to the field of payload anti-swing for marine crane, and designs a parallel MR anti-swing device. The dynamic model of the anti-swing system is derived based on the robot theory and Lagrange method. To enhance the efficiency of anti-swing and reduce the energy, the variable universe fuzzy PID (VUFPID) controller is designed. The anti-swing effect of MR anti-swing device is simulated and analyzed. The results show that the effect of payload anti-swing is exceed 80%, and the energy consumption of MR anti-swing device with VUFPID controller is reduced by 49% compared with MR anti-swing device with a fixed current (1.9 A) under the approximate anti-swing effect. The physical prototype of MR anti-swing device is installed on the laboratory crane. The experimental results show that the attitude of the payload is reduced by 80%. The proposed MR anti-swing device improve the efficiency of Marine cranes.
{"title":"Modeling and analysis of magnetorheological anti-swing device for marine crane","authors":"Chenxu Deng, Minghui Zhao, Guangdong Han, Shenghai Wang, Haiquan Chen, Yu-qing Sun","doi":"10.1177/14750902231213465","DOIUrl":"https://doi.org/10.1177/14750902231213465","url":null,"abstract":"Due to the marine environment, the operation efficiency of marine cranes is low, and it is easy to cause safety accidents. In this study, magnetorheological (MR) technology is applied to the field of payload anti-swing for marine crane, and designs a parallel MR anti-swing device. The dynamic model of the anti-swing system is derived based on the robot theory and Lagrange method. To enhance the efficiency of anti-swing and reduce the energy, the variable universe fuzzy PID (VUFPID) controller is designed. The anti-swing effect of MR anti-swing device is simulated and analyzed. The results show that the effect of payload anti-swing is exceed 80%, and the energy consumption of MR anti-swing device with VUFPID controller is reduced by 49% compared with MR anti-swing device with a fixed current (1.9 A) under the approximate anti-swing effect. The physical prototype of MR anti-swing device is installed on the laboratory crane. The experimental results show that the attitude of the payload is reduced by 80%. The proposed MR anti-swing device improve the efficiency of Marine cranes.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"60 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139162866","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 : 2023-12-23DOI: 10.1177/14750902231215410
Xuerong Cui, Qingqing Zheng, Juan Li, Binbin Jiang, Shibao Li, Jianhang Liu
Underwater acoustic target recognition is a hot research issue with a wide range of applications. The variable ocean environment and evolving underwater moving target noise reduction techniques greatly complicate the recognition task. Traditional recognition methods are difficult to obtain practical characterization features and robust recognition results due to the singular input features and the limitation of the network backbone. Therefore, We propose a parallel convolutional neural network (CNN)-Transformer model based on multimodal feature learning for underwater target recognition. The CNN module extracts deep features from the Mel-Frequency Cepstral Coefficients (MFCCs). The Transformer captures global information in the original time-domain signal. The two single-modal features are combined by an adaptive feature fusion module to construct joint features for target recognition. The effectiveness of the proposed method was verified in the Ships-Ear dataset, and the average accuracy of classification reached 98.58%. The experimental results show that our model works better than classical methods.
{"title":"A parallel convolutional neural network-transformer model for underwater target recognition based on multimodal feature learning","authors":"Xuerong Cui, Qingqing Zheng, Juan Li, Binbin Jiang, Shibao Li, Jianhang Liu","doi":"10.1177/14750902231215410","DOIUrl":"https://doi.org/10.1177/14750902231215410","url":null,"abstract":"Underwater acoustic target recognition is a hot research issue with a wide range of applications. The variable ocean environment and evolving underwater moving target noise reduction techniques greatly complicate the recognition task. Traditional recognition methods are difficult to obtain practical characterization features and robust recognition results due to the singular input features and the limitation of the network backbone. Therefore, We propose a parallel convolutional neural network (CNN)-Transformer model based on multimodal feature learning for underwater target recognition. The CNN module extracts deep features from the Mel-Frequency Cepstral Coefficients (MFCCs). The Transformer captures global information in the original time-domain signal. The two single-modal features are combined by an adaptive feature fusion module to construct joint features for target recognition. The effectiveness of the proposed method was verified in the Ships-Ear dataset, and the average accuracy of classification reached 98.58%. The experimental results show that our model works better than classical methods.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"93 7","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139163240","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}
Launching underwater gliders by aircraft could greatly expand the application of underwater gliders. However, during the process of the glider entry into the water, it will be subjected to significant impact loads, especially during the process of wing entry into the water. In this paper, a foldable wing module is proposed to reduce the water entry impact loads of the glider caused by the wings entering into the water. The effect of the foldable wing module on impact loads reduction and the influence of the foldable wing module on the water entry trajectory are studied by numerical method. The results show that the differences in mass and gravity center position caused by the foldable wing module have little effect on the water entry impact loads of the glider until the wings impact the water. When the glider enters the water obliquely, the wing module reduces the peak radial acceleration of the glider. In addition, the trajectory and time of the glider to reach the horizontal attitude are also reduced. These conclusions will be helpful for the designing of the wings of air-launched underwater gliders.
{"title":"Design and numerical study of foldable wing module of air-launched underwater glider","authors":"Xiangcheng Wu, Qiang Wang, Pengyao Yu, Chengyu Zhang","doi":"10.1177/14750902231213441","DOIUrl":"https://doi.org/10.1177/14750902231213441","url":null,"abstract":"Launching underwater gliders by aircraft could greatly expand the application of underwater gliders. However, during the process of the glider entry into the water, it will be subjected to significant impact loads, especially during the process of wing entry into the water. In this paper, a foldable wing module is proposed to reduce the water entry impact loads of the glider caused by the wings entering into the water. The effect of the foldable wing module on impact loads reduction and the influence of the foldable wing module on the water entry trajectory are studied by numerical method. The results show that the differences in mass and gravity center position caused by the foldable wing module have little effect on the water entry impact loads of the glider until the wings impact the water. When the glider enters the water obliquely, the wing module reduces the peak radial acceleration of the glider. In addition, the trajectory and time of the glider to reach the horizontal attitude are also reduced. These conclusions will be helpful for the designing of the wings of air-launched underwater gliders.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"68 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139164132","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 : 2023-12-15DOI: 10.1177/14750902231214585
Tengbin Zhu, Yingjie Xiao, Hao Zhang
Multi-extensibility and flexibility of unmanned surface vehicles (USVs) allow them perform many different tasks, further path planning technology is crucial to the safety, autonomy, and intelligent navigation of USVs. Firstly, this paper analyzes the impact of ocean currents and risk constraints on USV based on the electronic chart. Then take the optimal sailing time as the objective function and design a path planning algorithm based on an improved probabilistic roadmap (PRM) algorithm, in which a Gaussian space sampling algorithm based on edge detection is introduced. After building the network topology environment through improved PRM, then a Dijkstra algorithm based on great circle distance is used to solve the optimal path. Finally, the simulation experiment is designed through the MATLAB platform. By comparing the average and the three quartile lengths of the planned paths under three environments, the values of the designed Edge-Gaussion (E-G) PRM algorithm are smaller than Lazy PRM and Gaussian PRM algorithm, which shows that the improved PRM algorithm has better performance. When planning the USV path under the influence of current, compared with traditional length optimal path planning, although the navigation length planned by the designed algorithm is shorter by 972 m, sailing time is improved by 110 s, which efficiency shows the better application on the sea.
{"title":"Path planning of USV based on improved PRM under the influence of ocean current","authors":"Tengbin Zhu, Yingjie Xiao, Hao Zhang","doi":"10.1177/14750902231214585","DOIUrl":"https://doi.org/10.1177/14750902231214585","url":null,"abstract":"Multi-extensibility and flexibility of unmanned surface vehicles (USVs) allow them perform many different tasks, further path planning technology is crucial to the safety, autonomy, and intelligent navigation of USVs. Firstly, this paper analyzes the impact of ocean currents and risk constraints on USV based on the electronic chart. Then take the optimal sailing time as the objective function and design a path planning algorithm based on an improved probabilistic roadmap (PRM) algorithm, in which a Gaussian space sampling algorithm based on edge detection is introduced. After building the network topology environment through improved PRM, then a Dijkstra algorithm based on great circle distance is used to solve the optimal path. Finally, the simulation experiment is designed through the MATLAB platform. By comparing the average and the three quartile lengths of the planned paths under three environments, the values of the designed Edge-Gaussion (E-G) PRM algorithm are smaller than Lazy PRM and Gaussian PRM algorithm, which shows that the improved PRM algorithm has better performance. When planning the USV path under the influence of current, compared with traditional length optimal path planning, although the navigation length planned by the designed algorithm is shorter by 972 m, sailing time is improved by 110 s, which efficiency shows the better application on the sea.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"33 19","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995911","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 : 2023-12-08DOI: 10.1177/14750902231213449
Baptiste Hochfellner, Friedrich Wirz, Konstantin Pryymak, Ann-Christin Preuss, Gerhard Matz
Pilot-ignition Otto marine engines are known for greatly reduced emissions of air pollutants (sulphur oxides, nitrogen oxide, particulates) compared to marine diesel engines. However, lubricating oil emissions still are about one order of magnitude higher than in land-based systems. To identify reduction potentials, a better understanding of oil emission mechanisms has to be gained. For this purpose, mass spectrometric oil emission measurements and fluorescence lubricating film thickness measurements were performed on a medium-speed marine engine. With the fluorescence measuring system, the varying lubricating oil film on the cylinder wall can be visualised and analysed in sub-crank-angle resolution. By applying the developed calibration method to the measurement data, the oil film thickness can be determined in µm. It is shown that the oil film left by the piston rings on the liner as it moves down is almost halved after ignition compared to during intake stroke. The authors have further been able to detect and time operating point dependent ring rotation and investigations show a connection between ring rotation and cylinder liner temperature distribution. Aligning ring gaps allow blow-by to happen. This and other high intensity events such as engine knock, load shedding or the transition from diesel-mode to gas-mode, heavily disturb the oil layer and cause peaking oil emissions.
{"title":"Investigation of oil emission mechanisms in a marine medium-speed dual-fuel engine","authors":"Baptiste Hochfellner, Friedrich Wirz, Konstantin Pryymak, Ann-Christin Preuss, Gerhard Matz","doi":"10.1177/14750902231213449","DOIUrl":"https://doi.org/10.1177/14750902231213449","url":null,"abstract":"Pilot-ignition Otto marine engines are known for greatly reduced emissions of air pollutants (sulphur oxides, nitrogen oxide, particulates) compared to marine diesel engines. However, lubricating oil emissions still are about one order of magnitude higher than in land-based systems. To identify reduction potentials, a better understanding of oil emission mechanisms has to be gained. For this purpose, mass spectrometric oil emission measurements and fluorescence lubricating film thickness measurements were performed on a medium-speed marine engine. With the fluorescence measuring system, the varying lubricating oil film on the cylinder wall can be visualised and analysed in sub-crank-angle resolution. By applying the developed calibration method to the measurement data, the oil film thickness can be determined in µm. It is shown that the oil film left by the piston rings on the liner as it moves down is almost halved after ignition compared to during intake stroke. The authors have further been able to detect and time operating point dependent ring rotation and investigations show a connection between ring rotation and cylinder liner temperature distribution. Aligning ring gaps allow blow-by to happen. This and other high intensity events such as engine knock, load shedding or the transition from diesel-mode to gas-mode, heavily disturb the oil layer and cause peaking oil emissions.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"13 13","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138589214","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 : 2023-12-08DOI: 10.1177/14750902231213901
N. Ventikos, A. Koimtzoglou, Alexandros Michelis, Angeliki Stouraiti, Ioannis Kopsacheilis, Vassilis Podimatas
Piracy and armed robbery continue to pose significant security threats to the shipping industry. This paper presents a real-time threat assessment and crisis classification tool for piracy or armed robbery incidents. The tool is part of a crisis classification module that addresses various categories of security threats. This module is currently being developed as part of the EU-funded research project ISOLA, which aims to introduce an intelligent security superintendence ecosystem. The ecosystem is designed to complement the existing ship security processes and measures applied onboard passenger ships. The tool operates by providing real-time threat classification and subsequent warnings by analysing data collected from the ship’s legacy systems and installed sensors with the utilisation of Bayesian probabilistic techniques, particularly Bayesian Networks. The BN model developed for this purpose is thoroughly examined, and its validation is presented through indicative case studies involving piracy and armed robbery. The main objective is to improve situational awareness, enhance vigilance and early threat detection, and support the decision-making process for the Master and crew, especially under time-sensitive circumstances and stressful conditions.
{"title":"A Bayesian network-based tool for crisis classification in piracy or armed robbery incidents on passenger ships","authors":"N. Ventikos, A. Koimtzoglou, Alexandros Michelis, Angeliki Stouraiti, Ioannis Kopsacheilis, Vassilis Podimatas","doi":"10.1177/14750902231213901","DOIUrl":"https://doi.org/10.1177/14750902231213901","url":null,"abstract":"Piracy and armed robbery continue to pose significant security threats to the shipping industry. This paper presents a real-time threat assessment and crisis classification tool for piracy or armed robbery incidents. The tool is part of a crisis classification module that addresses various categories of security threats. This module is currently being developed as part of the EU-funded research project ISOLA, which aims to introduce an intelligent security superintendence ecosystem. The ecosystem is designed to complement the existing ship security processes and measures applied onboard passenger ships. The tool operates by providing real-time threat classification and subsequent warnings by analysing data collected from the ship’s legacy systems and installed sensors with the utilisation of Bayesian probabilistic techniques, particularly Bayesian Networks. The BN model developed for this purpose is thoroughly examined, and its validation is presented through indicative case studies involving piracy and armed robbery. The main objective is to improve situational awareness, enhance vigilance and early threat detection, and support the decision-making process for the Master and crew, especially under time-sensitive circumstances and stressful conditions.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"77 13","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138587014","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 : 2023-11-29DOI: 10.1177/14750902231210344
Lei Li, Qinghui Chen, Honggen Zhou, Chunjin Li, Qiang He
The assembly of the ship block is an extremely important stage of the shipbuilding process. Nevertheless, currently, the manual assembly efficiency is low, the accuracy is poor, and collision is very easy to occur. Therefore, there is an urgent need to conduct technical research on the automatic docking of ship blocks. The core of the automated docking technology is the attitude estimation and the trajectory planning of the posturing equipment. However, current data measurement and point set matching methods lead to large attitude-estimation errors, and it is difficult to meet the accuracy requirements of the assembly. Moreover, the current ship block trajectory planning methods pay more attention to single metrics, for example, time or energy consumption, while omitting the shock degree. In response to the above, this study first proposes a high-precision matching method for measuring point sets, in order to estimate the exact attitude of the ship block. Subsequently, trajectory translation for the block is performed using the seventh-degree polynomial. On this basis, a nonlinear weighted improved particle swarm optimization (IPSO) method is proposed to optimize the time, energy consumption and shock degree in the ship block trajectory planning process. Finally, the accuracy of the matching optimization is validated by simulation analysis and it is concluded that the seventh-degree polynomial leads to less shock than other polynomials. Furthermore, the shock force does not change abruptly even when the ship block is poised in steps. Through IPSO, the energy consumption and shock degree performance indices are optimized by 37.07% and 50.06%, respectively, in the ship block translation process.
{"title":"Efficient and precise docking trajectory optimization for the ship block assembly","authors":"Lei Li, Qinghui Chen, Honggen Zhou, Chunjin Li, Qiang He","doi":"10.1177/14750902231210344","DOIUrl":"https://doi.org/10.1177/14750902231210344","url":null,"abstract":"The assembly of the ship block is an extremely important stage of the shipbuilding process. Nevertheless, currently, the manual assembly efficiency is low, the accuracy is poor, and collision is very easy to occur. Therefore, there is an urgent need to conduct technical research on the automatic docking of ship blocks. The core of the automated docking technology is the attitude estimation and the trajectory planning of the posturing equipment. However, current data measurement and point set matching methods lead to large attitude-estimation errors, and it is difficult to meet the accuracy requirements of the assembly. Moreover, the current ship block trajectory planning methods pay more attention to single metrics, for example, time or energy consumption, while omitting the shock degree. In response to the above, this study first proposes a high-precision matching method for measuring point sets, in order to estimate the exact attitude of the ship block. Subsequently, trajectory translation for the block is performed using the seventh-degree polynomial. On this basis, a nonlinear weighted improved particle swarm optimization (IPSO) method is proposed to optimize the time, energy consumption and shock degree in the ship block trajectory planning process. Finally, the accuracy of the matching optimization is validated by simulation analysis and it is concluded that the seventh-degree polynomial leads to less shock than other polynomials. Furthermore, the shock force does not change abruptly even when the ship block is poised in steps. Through IPSO, the energy consumption and shock degree performance indices are optimized by 37.07% and 50.06%, respectively, in the ship block translation process.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"105 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139209419","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 : 2023-11-25DOI: 10.1177/14750902231218551
{"title":"Corrigendum to “Guest editorial for the special issue on “marine hydrodynamics for innovative design”","authors":"","doi":"10.1177/14750902231218551","DOIUrl":"https://doi.org/10.1177/14750902231218551","url":null,"abstract":"","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"17 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139237567","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 : 2023-11-22DOI: 10.1177/14750902231210044
M. Acanfora, M. Altosole, Tommaso Coppola, Riccardo Martino
This paper provides a compendium of the numerical model that goes under the name of FloodW. This code is a fast tool for the simulation and the analysis of the effects of flooding water on ship dynamics and loads in time domain, developed for safety purposes. It has been recently involved in the international benchmark study on simulation of flooding and motions of damaged Ropax vessels within the EU Horizon 2020 project FLARE, where the name FloodW was given for the first time. Indeed, the development of the code started almost 10 years ago for still water applications, limited to ship motions, up to flooding simulation in regular waves with the possibility to study also non-linear hull girder loads. The core feature of the flooding water modeling is in the assumption of a free surface normal to the apparent gravity vector, which is evaluated accounting for ship and water dynamics. Although this approach, from validations with experimental data, was found accurate in the whole range of filling levels of the damaged compartment, with finer accuracy for intermediate fillings, an alternative method was also proposed and implemented, pertinent to low filling levels. Therefore, this paper provides a comprehensive description of the FloodW code together with its applications, including also the recent developments in participating to the benchmark FLARE, regarding ship flooding in irregular wave scenario.
{"title":"A comprehensive description and application of the FloodW simulation code for flooded ship problems: From still water to irregular wave scenarios","authors":"M. Acanfora, M. Altosole, Tommaso Coppola, Riccardo Martino","doi":"10.1177/14750902231210044","DOIUrl":"https://doi.org/10.1177/14750902231210044","url":null,"abstract":"This paper provides a compendium of the numerical model that goes under the name of FloodW. This code is a fast tool for the simulation and the analysis of the effects of flooding water on ship dynamics and loads in time domain, developed for safety purposes. It has been recently involved in the international benchmark study on simulation of flooding and motions of damaged Ropax vessels within the EU Horizon 2020 project FLARE, where the name FloodW was given for the first time. Indeed, the development of the code started almost 10 years ago for still water applications, limited to ship motions, up to flooding simulation in regular waves with the possibility to study also non-linear hull girder loads. The core feature of the flooding water modeling is in the assumption of a free surface normal to the apparent gravity vector, which is evaluated accounting for ship and water dynamics. Although this approach, from validations with experimental data, was found accurate in the whole range of filling levels of the damaged compartment, with finer accuracy for intermediate fillings, an alternative method was also proposed and implemented, pertinent to low filling levels. Therefore, this paper provides a comprehensive description of the FloodW code together with its applications, including also the recent developments in participating to the benchmark FLARE, regarding ship flooding in irregular wave scenario.","PeriodicalId":20667,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment","volume":"23 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139246667","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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