{"title":"「アンモニアの利活用とカーボンニュートラルに向けて」によせて","authors":"Nobuyuki Yokoyama","doi":"10.5988/jime.58.667","DOIUrl":"https://doi.org/10.5988/jime.58.667","url":null,"abstract":"","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637814","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}
{"title":"Efforts to Use Ammonia as Refrigerant - Promoting of Wider Usage for Cooling and Freezing","authors":"Shuji Fukano","doi":"10.5988/jime.58.668","DOIUrl":"https://doi.org/10.5988/jime.58.668","url":null,"abstract":"","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637816","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}
{"title":"工業炉の脱炭素化に向けた水素・アンモニア燃焼技術開発の紹介","authors":"Shigemasa Hattori","doi":"10.5988/jime.58.674","DOIUrl":"https://doi.org/10.5988/jime.58.674","url":null,"abstract":"","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637584","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}
{"title":"Foreword for Special Issue \"Latest Development on Maritime Autonomous Ship Systems\"","authors":"Etsuro Shimizu","doi":"10.5988/jime.58.606","DOIUrl":"https://doi.org/10.5988/jime.58.606","url":null,"abstract":"","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637802","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 : 2023-07-28DOI: 10.1080/20464177.2023.2241313
Patrick Schwager, Heinz Bekebrok, K. Gehrke, Martin Vehse
A reliable estimate of the electrical demand is a decisive factor in the design of electric board systems on cruise ships. This applies to all areas of the ship, including the hotel area with its up to several thousand cabins, which account for a non-negligible share of the total energy demand. In this paper, a simplified bottom-up model that can depict the electrical demand cabins with high temporal resolution and thus support marine and electrical engineers in developing future on-board power grids is presented. Key-card data will be used as a basis to easily access the behaviour of passengers on board. Another benefit is that the key data of the electrical consumers can be easily adapted to different types of ships and cabins. By including the ships route it is possible to precisely calculate the heat input through the glazing at any time of day and to determine its effect on the air-conditioning requirement. The model presented here is therefore not limited to certain regions but can be used globally. The functionality of the model is demonstrated on the example of a Caribbean cruise where the average electrical demand of a cabin is determined to 1.6 kWh per day.
{"title":"A probabilistic bottom-up modelling approach for synthetic load profiles within the energy efficiency management of cruise ship cabins","authors":"Patrick Schwager, Heinz Bekebrok, K. Gehrke, Martin Vehse","doi":"10.1080/20464177.2023.2241313","DOIUrl":"https://doi.org/10.1080/20464177.2023.2241313","url":null,"abstract":"A reliable estimate of the electrical demand is a decisive factor in the design of electric board systems on cruise ships. This applies to all areas of the ship, including the hotel area with its up to several thousand cabins, which account for a non-negligible share of the total energy demand. In this paper, a simplified bottom-up model that can depict the electrical demand cabins with high temporal resolution and thus support marine and electrical engineers in developing future on-board power grids is presented. Key-card data will be used as a basis to easily access the behaviour of passengers on board. Another benefit is that the key data of the electrical consumers can be easily adapted to different types of ships and cabins. By including the ships route it is possible to precisely calculate the heat input through the glazing at any time of day and to determine its effect on the air-conditioning requirement. The model presented here is therefore not limited to certain regions but can be used globally. The functionality of the model is demonstrated on the example of a Caribbean cruise where the average electrical demand of a cabin is determined to 1.6 kWh per day.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"1 1","pages":"304 - 312"},"PeriodicalIF":2.6,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89860298","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 : 2023-07-14DOI: 10.1080/20464177.2023.2233274
E. Yari, Mohammad Reza Nateghi (MD, MPH)
Investigating the Hydro-acoustic behaviour and noise of marine propellers is very important, especially in underwater vessels and submarines. The present study aims to numerically model the hydrodynamic noise of a benchmark marine propeller using the computational fluid dynamics method based on the finite volume method under open water conditions. The DES turbulence model is used in the numerical simulation, which is a good model for modelling small eddies near the wall and covers the advantages of both LES and RANS models. To increase the accuracy of the numerical solution, a finer grid has been used on the blades tips, hub, and boss. According to the investigations, time step independence occurs for 0.001 s. In the following, the numerical analysis of the hydrodynamic noise of the DTMB4119 propeller has been extracted at the advance coefficients of 0.5–1.1 and distances of 1D to 10D from the propeller in the axial directions and perpendicular to the fluid flow. Based on the obtained results, the highest level of noise emission in the flow direction is related to low frequencies, and with the increase in frequency and distance from the noise source, the emitted noise level decreases. Increasing the distance from the noise source from 1D to 10D decreases the emitted noise level by 40 dB. For every 0.1 reduction in the advance coefficient, 10 dB is added to the noise emission level in the axial direction.
{"title":"Hydro-acoustic and noise analysis of DTMB4119 marine propeller at different advance coefficients using DES turbulence model","authors":"E. Yari, Mohammad Reza Nateghi (MD, MPH)","doi":"10.1080/20464177.2023.2233274","DOIUrl":"https://doi.org/10.1080/20464177.2023.2233274","url":null,"abstract":"Investigating the Hydro-acoustic behaviour and noise of marine propellers is very important, especially in underwater vessels and submarines. The present study aims to numerically model the hydrodynamic noise of a benchmark marine propeller using the computational fluid dynamics method based on the finite volume method under open water conditions. The DES turbulence model is used in the numerical simulation, which is a good model for modelling small eddies near the wall and covers the advantages of both LES and RANS models. To increase the accuracy of the numerical solution, a finer grid has been used on the blades tips, hub, and boss. According to the investigations, time step independence occurs for 0.001 s. In the following, the numerical analysis of the hydrodynamic noise of the DTMB4119 propeller has been extracted at the advance coefficients of 0.5–1.1 and distances of 1D to 10D from the propeller in the axial directions and perpendicular to the fluid flow. Based on the obtained results, the highest level of noise emission in the flow direction is related to low frequencies, and with the increase in frequency and distance from the noise source, the emitted noise level decreases. Increasing the distance from the noise source from 1D to 10D decreases the emitted noise level by 40 dB. For every 0.1 reduction in the advance coefficient, 10 dB is added to the noise emission level in the axial direction.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"22 1","pages":"248 - 261"},"PeriodicalIF":2.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43593589","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 : 2023-07-10DOI: 10.1080/20464177.2023.2233264
Zhen Guo, Chuang Ma, Yi Liu, Fu‐mian Li, Chenfeng Li
In this study, the fire safety of a ship structure is evaluated using a fire dynamics algorithm for large eddy simulations and a structural-thermal coupling method. Taking a two-story cabin as an example, a typical I-channel is adopted and the fire-thermal-structure coupling calculation of the cabin is realised through a thermal-mechanical coupling data interface. On this basis, the failure characteristics, stress distribution, and deformation modes of the cabin under different heat release rate (0–8 MW) and fire locations (side and middle chambers) are studied. The results show that an increase in the heat release rate in the side chamber causes the failure path of the cabin to gradually expand from the fire-source side to the sagging plane. This differs from the failure mode of the cabin in the sagging plane at ambient temperature. When a high-power fire occurs in the middle chamber of the cabin, its spatial layout significantly influences the damage location. Moreover, the residual strength of the cabin at different fire positions in a heat release rate range of 0–8 MW is predicted.
{"title":"Residual strength prediction and structural response of a multi-chamber cabin to a fire","authors":"Zhen Guo, Chuang Ma, Yi Liu, Fu‐mian Li, Chenfeng Li","doi":"10.1080/20464177.2023.2233264","DOIUrl":"https://doi.org/10.1080/20464177.2023.2233264","url":null,"abstract":"In this study, the fire safety of a ship structure is evaluated using a fire dynamics algorithm for large eddy simulations and a structural-thermal coupling method. Taking a two-story cabin as an example, a typical I-channel is adopted and the fire-thermal-structure coupling calculation of the cabin is realised through a thermal-mechanical coupling data interface. On this basis, the failure characteristics, stress distribution, and deformation modes of the cabin under different heat release rate (0–8 MW) and fire locations (side and middle chambers) are studied. The results show that an increase in the heat release rate in the side chamber causes the failure path of the cabin to gradually expand from the fire-source side to the sagging plane. This differs from the failure mode of the cabin in the sagging plane at ambient temperature. When a high-power fire occurs in the middle chamber of the cabin, its spatial layout significantly influences the damage location. Moreover, the residual strength of the cabin at different fire positions in a heat release rate range of 0–8 MW is predicted.","PeriodicalId":50152,"journal":{"name":"Journal of Marine Engineering and Technology","volume":"70 1","pages":"294 - 303"},"PeriodicalIF":2.6,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88478031","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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