International Shipbuilding Progress最新文献

Are current shipbuilding cost estimation methods ready for a sustainable future? A literature review of cost estimation methods and challenges 目前的造船成本估算方法是否为可持续的未来做好了准备？关于成本估算方法和挑战的文献综述

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International Shipbuilding Progress Pub Date : 2024-06-04 DOI: 10.3233/isp-230009

Gerrit Alblas, Jeroen Pruijn

{"title":"Are current shipbuilding cost estimation methods ready for a sustainable future? A literature review of cost estimation methods and challenges","authors":"Gerrit Alblas, Jeroen Pruijn","doi":"10.3233/isp-230009","DOIUrl":"https://doi.org/10.3233/isp-230009","url":null,"abstract":"In the fiercely competitive shipbuilding industry, precise cost estimates must be considered as they serve as a critical input for determining market prices effectively and ensuring a small profit for the shipyard. In Western Europe, where most projects are Engineering-To-Order (ETO), cost estimations are extra challenging, due to lack of similarity between projects. On top of this, cost estimations are becoming increasingly difficult in a market confronted by mounting challenges related to safety regulations, cost-effectiveness, and the pressing need to address energy conservation and environmental protection. New technologies introduce changes in nearly all aspects of shipbuilding design and construction. This article conducts a literature review, to present the state-of-the-art methods for estimating man-hours, explicitly focusing on man-hours for shipyard production, excluding overhead costs and challenges the suitability of existing systems for ETO and especially for the changes caused to ships by the energy transition. An indication is given of the practicality of each method as outlined in the literature. A solution direction, incorporating the construction process, is proposed to improve cost estimations for ETO projects in pre-contract phase.","PeriodicalId":45800,"journal":{"name":"International Shipbuilding Progress","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141267805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of navigators’ ergonomic awareness and working conditions on navigation bridges 评估导航员的人体工程学意识和导航桥上的工作条件

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International Shipbuilding Progress Pub Date : 2024-06-03 DOI: 10.3233/isp-230014

Michał Stopa

{"title":"Assessment of navigators’ ergonomic awareness and working conditions on navigation bridges","authors":"Michał Stopa","doi":"10.3233/isp-230014","DOIUrl":"https://doi.org/10.3233/isp-230014","url":null,"abstract":"Background: Merchant ships, despite huge technological progress, are still operated by qualified navigators. According to ergonomics principles, human is a part of the whole system and is affected by the surrounding environment. Objective: The purpose of the paper was to assess the ergonomic awareness of professional navigators, to understand their expectations towards navigation bridges and to check if they obtain enough support from their workplace. Methods: A special questionnaire was developed and 200 responses were obtained from seafarers with license of Officer Of the Watch or higher. Statistical analysis were carried out to find out relationships and differences between answers and groups of respondents. Results: Improper ergonomics and less than optimal working conditions were not isolated incidents and occurred to be rather common problem of the industry. The results suggest that ergonomic awareness is at relatively high level, however this knowledge is frequently not used in practice. Conclusions: Poor design and lack of proper ergonomics training might contribute to commonly experienced signs of fatigue, pain episodes and therefore reduced performance of seafarers. Navigators find ergonomics important, however navigation bridges often do not meet ergonomics and comfort standards, therefore there is still a room for improvement in this area.","PeriodicalId":45800,"journal":{"name":"International Shipbuilding Progress","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141269717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Force and water jet impact reduction on adjacent structures by means of free surface breakwaters 通过自由表面防波堤减少对邻近结构的力和水射流影响

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International Shipbuilding Progress Pub Date : 2023-12-22 DOI: 10.3233/isp-230012

K.J. Holkema, C. Aalbers, P. R. Wellens

引用次数: 0

Multi-fidelity Kriging extrapolation together with CFD for the design of the cross-section of a falling lifeboat 多保真克里金推断法与 CFD 一起用于坠落救生艇的横截面设计

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International Shipbuilding Progress Pub Date : 2023-12-22 DOI: 10.3233/isp-230013

Robert Wenink, M. van der Eijk, Neil Yorke-Smith, Peter Wellens

{"title":"Multi-fidelity Kriging extrapolation together with CFD for the design of the cross-section of a falling lifeboat","authors":"Robert Wenink, M. van der Eijk, Neil Yorke-Smith, Peter Wellens","doi":"10.3233/isp-230013","DOIUrl":"https://doi.org/10.3233/isp-230013","url":null,"abstract":"Surrogate modelling techniques such as Kriging are a popular means for cheaply emulating the response of expensive Computational Fluid Dynamics (CFD) simulations. These surrogate models are often used for exploring a parameterised design space and identifying optimal designs. Multi-fidelity Kriging extends the methodology to incorporate data of variable accuracy and costs to create a more effective surrogate. This work recognises that the grid convergence property of CFD solvers is currently an unused source of information and presents a novel method that, by leveraging the data structure implied by grid convergence, could further improve the performance of the surrogate model and the corresponding optimisation process. Grid convergence states that the simulation solution converges to the true simulation solution as the numerical grid is refined. The proposed method is tested with realistic multi-fidelity data acquired with CFD simulations. The performance of the surrogate model is comparable to an existing method, and likely more robust. More research is needed to explore the full potential of the proposed method. Code has been made available online at https://github.com/robertwenink/MFK-Extrapolation.","PeriodicalId":45800,"journal":{"name":"International Shipbuilding Progress","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138945024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of surface wettability of silicon-incorporated diamond-like carbon films on barnacle larval settlement 含硅类金刚石膜表面润湿性对藤壶幼虫沉降的影响

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International Shipbuilding Progress Pub Date : 2023-06-22 DOI: 10.3233/isp-220008

K. Ozeki, S. Nakahara

{"title":"Effects of surface wettability of silicon-incorporated diamond-like carbon films on barnacle larval settlement","authors":"K. Ozeki, S. Nakahara","doi":"10.3233/isp-220008","DOIUrl":"https://doi.org/10.3233/isp-220008","url":null,"abstract":"The colonization of barnacles on surfaces has detrimental effects on shipping, leisure vessels, heat exchangers, oceanographic sensors, and aquaculture systems. One strategy for avoiding barnacle colonization on surfaces is to utilize surface wettability. Silicone-incorporated diamond-like carbon (Si-DLC) has high hardness and a low friction coefficient, and an increase in the incorporation of Si leads to hydrophobicity. By contrast, oxygen plasma treatment produces hydrophilicity in Si-DLC films. The improved surface wettability of Si-DLC may reduce barnacle colonization. However, few studies have been conducted on barnacle larval settlement in relation to Si-DLC films. The aim of this study is to evaluate barnacle larval settlement on Si-DLC films and on oxygen-plasma-treated Si-DLC films. Si-DLC films were prepared by radio-frequency plasma-enhanced chemical vapor deposition and treated with oxygen plasma. The films were characterized using Raman spectroscopy and X-ray photoelectron spectroscopy. Contact angles of the films were measured to evaluate their hydrophobicity. Barnacle cyprid larva settlement was observed on the Si-DLC and oxygen-plasma-treated Si-DLC films. The contact angle of the Si-DLC-0% film was 69.9 ± 3 . 3 ∘ and increased with Si incorporation. Following oxygen plasma treatment, the contact angle of the Si-DLC-0% films decreased to 10.9 ± 4 . 4 ∘ and gradually increased with Si incorporation. The barnacle cyprid larval settlement ratio for the non-coated stainless plate was 36.4%, whereas that of the DLC films was 15.0%, which decreased with Si incorporation. Following oxygen plasma treatment, the ratio of barnacle cyprid larval settlement in Si-DLC films was lower than for the Si-DLC films. The Si-DLC film was effective in avoiding barnacle adhesion, whereas the oxygen-plasma-treated Si-DLC was even more effective. This study demonstrated the feasibility of Si-DLC for antifouling against barnacles.","PeriodicalId":45800,"journal":{"name":"International Shipbuilding Progress","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44583608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial 社论

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International Shipbuilding Progress Pub Date : 2023-06-22 DOI: 10.3233/isp-230608

Pieter Wellens

引用次数: 0

A Grey-box model approach using noon report data for trim optimization 一种利用正午报告数据进行装饰优化的灰盒模型方法

IF 0.8

International Shipbuilding Progress Pub Date : 2023-06-22 DOI: 10.3233/isp-220009

Robert H. Zwart, Jordi Bogaard, A. Kana

{"title":"A Grey-box model approach using noon report data for trim optimization","authors":"Robert H. Zwart, Jordi Bogaard, A. Kana","doi":"10.3233/isp-220009","DOIUrl":"https://doi.org/10.3233/isp-220009","url":null,"abstract":"Trim optimization improves the energy efficiency of ships, thus reducing operational costs and emissions; however, trim tables are only available for a limited number of ships. There is thus a desire to develop additional, more accurate trim tables without the need for expensive model testing. The objective of this research was to develop a method to decrease fuel consumption by trim optimization, by a dynamic shaft power estimation model based on available operational data. A method that uses noon report data and a grey-box modelling approach is proposed. The grey box model consists of a multi-layer feedforward neural network to estimate the required shaft power, using operational parameters and an initial estimate of the required shaft power. A case study is presented for a modern chemical tanker and sea trials have been conducted to validate the results. The method provides correct trim advice for full load conditions; however, the magnitude of the effect is smaller compared to sea trial results. The model is able to estimate the required power with an average accuracy of over 6% for a random subset of the noon report data. Due to challenges inherent to noon reports as a data source, the actual effect of trim and speed have a bigger magnitude than the extracted trend.","PeriodicalId":45800,"journal":{"name":"International Shipbuilding Progress","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44146923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the potential of iron powder as fuel on the design and performance of container ships 探索铁粉作为燃料在集装箱船设计和性能方面的潜力

IF 0.8

International Shipbuilding Progress Pub Date : 2023-04-27 DOI: 10.3233/isp-220012

Jochem de Kwant, R. Hekkenberg, Apostolos Souflis-Rigas, A. Kana

{"title":"Exploring the potential of iron powder as fuel on the design and performance of container ships","authors":"Jochem de Kwant, R. Hekkenberg, Apostolos Souflis-Rigas, A. Kana","doi":"10.3233/isp-220012","DOIUrl":"https://doi.org/10.3233/isp-220012","url":null,"abstract":"This article examines the potential implications of using iron powder as an alternative fuel on the design and performance of container ships. Iron powder is a relatively new alternative energy carrier and one in which little research has been done into the application on-board vessels as part of the maritime energy transition. The key benefits of iron powder are that it is a circular energy carrier and the combustion process emits no greenhouse gases. Transitioning to iron powder is expected to have far reaching implications for the design and performance of ships. Thus, this paper aims to perform the first study assessing the potential of this concept applied to container ships. To do so, a preliminary design space was explored with a custom parametric design model developed to generate preliminary designs of iron fuelled container ships as a function of the operational profile. Using this parametric design model, it was identified that iron fuelled container ships are weight limited, unlike conventionally fuelled container vessels. Furthermore, iron fuelled container ships are best suited for short voyages at low cruising speed. For these voyages, it was concluded that iron fuelled ships are economically feasible; however, other alternative marine fuels are likely more profitable than iron due to the low efficiency of iron fuelled ships and the high cost of iron per unit energy.","PeriodicalId":45800,"journal":{"name":"International Shipbuilding Progress","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44585063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Editorial 编辑

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International Shipbuilding Progress Pub Date : 2022-12-06 DOI: 10.3233/isp-229001

Pieter Wellens

引用次数: 0

A two-dimensional boundary element method with generating absorbing boundary condition for floating bodies of arbitrary shape in the frequency domain 频域中任意形状浮体产生吸收边界条件的二维边界元方法

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International Shipbuilding Progress Pub Date : 2022-12-05 DOI: 10.3233/isp-210007

Maarten Gabriel, P. Wellens

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