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Model scale investigation of aspects influencing the ice resistance of ships sailing ahead in level ice 影响船舶在水平冰中航行阻力的模型尺度研究
IF 2.2
Ship Technology Research Pub Date : 2020-01-02 DOI: 10.1080/09377255.2019.1576390
D. Myland, S. Ehlers
{"title":"Model scale investigation of aspects influencing the ice resistance of ships sailing ahead in level ice","authors":"D. Myland, S. Ehlers","doi":"10.1080/09377255.2019.1576390","DOIUrl":"https://doi.org/10.1080/09377255.2019.1576390","url":null,"abstract":"ABSTRACT For a reliable prediction of the total resistance in ice in an early ship design stage, it is of great importance to have knowledge on the different influencing aspects. Three of the quite poorly investigated aspects of ship resistance in ice are evaluated for a contemporary common ice-breaking ship type with model tests in ice: The different components of the total resistance in ice are investigated by tests in pre-sawn ice. The additional resistance of a skeg in the bow area is analysed with model tests in ice with an instrumented skeg. The ship bottom ice coverage is determined by means of an underwater image analysis methodology. The results of these investigations are given and discussed.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"67 1","pages":"26 - 36"},"PeriodicalIF":2.2,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2019.1576390","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41379165","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: 5
Investigation of a semi-submersible floating wind turbine in surge decay using CFD 基于CFD的半潜式浮动风力涡轮机喘振衰减研究
IF 2.2
Ship Technology Research Pub Date : 2020-01-02 DOI: 10.1080/09377255.2018.1555987
S. Burmester, G. Vaz, S. Gueydon, O. el Moctar
{"title":"Investigation of a semi-submersible floating wind turbine in surge decay using CFD","authors":"S. Burmester, G. Vaz, S. Gueydon, O. el Moctar","doi":"10.1080/09377255.2018.1555987","DOIUrl":"https://doi.org/10.1080/09377255.2018.1555987","url":null,"abstract":"ABSTRACT The hydrodynamic damping estimation of the surge motion and the flow characteristics of a moored semi-submersible floating offshore wind turbine is the focus of this paper. The numerical surge decay tests were investigated using a Reynolds-Averaged Navier–Stokes solver. Solution verification on the numerical simulations was performed by estimation of the numerical errors and uncertainties. A linear stiffness matrix and a non-linear quasi-static mooring model were used in the equations of motion. Several surge decay simulations were performed to understand the effects of wave radiation, coupled motions and non-linear moorings on the hydrodynamic damping and the flow field around the floater. The numerical results were compared with experimental data. The free surface had major effects on the hydrodynamic damping and the flow field.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"67 1","pages":"14 - 2"},"PeriodicalIF":2.2,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1555987","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48308166","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: 26
Speed trial analysis method eliminating the need for external disturbance data 无需外部干扰数据的速度试验分析方法
IF 2.2
Ship Technology Research Pub Date : 2019-06-24 DOI: 10.1080/09377255.2019.1633777
H. Yasukawa
{"title":"Speed trial analysis method eliminating the need for external disturbance data","authors":"H. Yasukawa","doi":"10.1080/09377255.2019.1633777","DOIUrl":"https://doi.org/10.1080/09377255.2019.1633777","url":null,"abstract":"ABSTRACT Ship speed performance is typically evaluated in the absence of external disturbances. Therefore, speed performance data obtained in full-scale trials are corrected to obtain speed performance with no external disturbances by eliminating disturbance effects due to wind, waves and current. This correction is called the speed trial analysis of ships. In this paper, a speed trial analysis method named as the power-based Taylor expansion method (PTEM) is presented, in which added resistance caused by an external disturbance and current velocity are not required. To verify this method, virtual speed trial data are generated theoretically for various current velocity conditions with constant wind, and the PTEM is applied to eliminate external disturbance effects from virtual speed trial data. Correction results are compared with known true results. The correction accuracy using the PTEM is sufficient even for varying current velocities with short periods. Furthermore, the PTEM is applied to the speed trial analysis of four full-scale tankers of the same hull form. The scatter of the correction results using the PTEM is smaller than that using other existing methods. The PTEM is useful as a speed trial analysis tool because it does not require external disturbance data.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"135 - 149"},"PeriodicalIF":2.2,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2019.1633777","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44960258","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: 1
On the resistance and speed loss of full type ships in a seaway 全型船舶在航道中的阻力与航速损失
IF 2.2
Ship Technology Research Pub Date : 2019-05-07 DOI: 10.1080/09377255.2019.1613294
Shukui Liu, B. Shang, A. Papanikolaou
{"title":"On the resistance and speed loss of full type ships in a seaway","authors":"Shukui Liu, B. Shang, A. Papanikolaou","doi":"10.1080/09377255.2019.1613294","DOIUrl":"https://doi.org/10.1080/09377255.2019.1613294","url":null,"abstract":"ABSTRACT This paper presents results of a systematic study on the resistance and speed loss of full type ships in waves. The percentage resistance-increase in waves against experimentally measured calm water resistance data was estimated by use of two alternative empirical formulas, namely one proposed by the authors and the other one as recommended by ITTC. The obtained results clearly show that the percentage resistance-increase and the associated (involuntary) speed loss are strongly dependent on ship’s absolute size, loading condition and the operating seaway conditions and they can be satisfactorily quantified. This should be taken into account in the ship design process, when determining the sea margin for the selection of the machinery and propulsion system, when analysing sea trials and/or when preparing scaled model experiments to assess ship’s performance in realistic seaway scenarios.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"161 - 179"},"PeriodicalIF":2.2,"publicationDate":"2019-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2019.1613294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43496722","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: 14
A Fleet Efficiency Factor for fleet size and mix problems using particle swarm optimisation 用粒子群优化方法求解机队规模和混合问题的机队效率系数
IF 2.2
Ship Technology Research Pub Date : 2019-05-04 DOI: 10.1080/09377255.2018.1558612
S. Ehlers, Hannah Pache, Franz von Bock und Polach, Trond A. V. Johnsen
{"title":"A Fleet Efficiency Factor for fleet size and mix problems using particle swarm optimisation","authors":"S. Ehlers, Hannah Pache, Franz von Bock und Polach, Trond A. V. Johnsen","doi":"10.1080/09377255.2018.1558612","DOIUrl":"https://doi.org/10.1080/09377255.2018.1558612","url":null,"abstract":"ABSTRACT Finding the optimal fleet composition under uncertainties is crucial for the economic success of a business. This paper presents the Fleet Efficiency Factor, a decision support tool for fleet size and mix problems and fleet composition problems. The method is based on a particle swarm optimisation algorithm combined with a stochastic model to include uncertainties into the decision-making progress. This combination allows selecting the best option out of a pool of available vessels, vehicles and aircrafts. Additionally, the FEF is based on the classical ship merit factor and thus capable of comparing different fleet compositions according to their economic efficiency, by describing the efficiency in a simple factor. A case study for the supply of an offshore platform in the high North is conducted. The approach proved to be flexible and applicable to different strategical and tactical planning problems in maritime transportation.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"106 - 116"},"PeriodicalIF":2.2,"publicationDate":"2019-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1558612","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46224875","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: 1
On the heading stability of a ship in waves 论船舶在波浪中的航向稳定性
IF 2.2
Ship Technology Research Pub Date : 2019-04-09 DOI: 10.1080/09377255.2019.1598607
A. Cura-Hochbaum, S. Uharek
{"title":"On the heading stability of a ship in waves","authors":"A. Cura-Hochbaum, S. Uharek","doi":"10.1080/09377255.2019.1598607","DOIUrl":"https://doi.org/10.1080/09377255.2019.1598607","url":null,"abstract":"ABSTRACT A procedure is presented for analysing the sway-yaw-heading stability of a ship in regular waves. A linear stability analysis of the motion equations of the ship, using a mathematical model for approximating the hydrodynamic forces acting on the ship including mean forces and moments due to waves, shows if the equilibrium state for a given wave, i.e. the corresponding combination of rudder and drift angle, represents a stable condition. RANS computations for the container ship DTC in calm water and in regular waves of diverse lengths coming from several directions have been used to determine all coefficients of the mathematical model in the showed sample application. Selected situations proven to be stable in theory have successfully been directly simulated afterwards with the RANS code, confirming the validity of the proposed procedure. Some preliminary experiments at the Hamburg Ship Model Basin HSVA support our approach.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"75 - 82"},"PeriodicalIF":2.2,"publicationDate":"2019-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2019.1598607","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46055973","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
Simulation-based analysis method for damage survivability of passenger ships 基于仿真的客船损伤生存能力分析方法
IF 2.2
Ship Technology Research Pub Date : 2019-04-08 DOI: 10.1080/09377255.2019.1598629
P. Ruponen, D. Lindroth, A.-L. Routi, M. Aartovaara
{"title":"Simulation-based analysis method for damage survivability of passenger ships","authors":"P. Ruponen, D. Lindroth, A.-L. Routi, M. Aartovaara","doi":"10.1080/09377255.2019.1598629","DOIUrl":"https://doi.org/10.1080/09377255.2019.1598629","url":null,"abstract":"ABSTRACT A new approach for analysing the level of survivability for a passenger ship in the event of a collision damage is presented. Monte Carlo simulation is used for generating a large number of damage cases. The probability distributions for damage extent and location are based on the current SOLAS regulation. Each case is calculated with time-domain flooding simulation, assuming quasi-static motions and calm sea, thus enabling evaluation of the righting lever curve during the flooding process. The ship survivability is analysed based on requirements for a sufficient reserve stability. The proposed method is demonstrated with a large passenger ship design. Based on the detailed investigation of the results, the effects of various design changes are studied. Furthermore, the impact of waves on the flooding process is studied. The presented method for survivability assessment is robust and especially suitable for comparing design variations, or ships with similar main dimensions.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"180 - 192"},"PeriodicalIF":2.2,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2019.1598629","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48674259","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: 24
Potential and limitations of scale resolved simulations for ship hydrodynamics applications 船舶流体力学中尺度解析模拟的潜力和局限性
IF 2.2
Ship Technology Research Pub Date : 2019-02-08 DOI: 10.1080/09377255.2019.1574965
N. Kornev, I. Shevchuk, N. Abbas, P. Anschau, S. Samarbakhsh
{"title":"Potential and limitations of scale resolved simulations for ship hydrodynamics applications","authors":"N. Kornev, I. Shevchuk, N. Abbas, P. Anschau, S. Samarbakhsh","doi":"10.1080/09377255.2019.1574965","DOIUrl":"https://doi.org/10.1080/09377255.2019.1574965","url":null,"abstract":"ABSTRACT The paper gives an overview of experience gathered by the authors in development and application of hybrid URANS/LES methods for the solution of ship hydrodynamic problems. Difficulties arising at the interface between URANS and LES are discussed and illustrated for a channel flow benchmark. A hybrid model developed by the authors is described. It was shown that pure LES has advantages over hybrid models provided a sufficient resolution can be attained for a given Re number. Advantages of hybrid models over RANS-based ones is demonstrated for the determination of wake parameters behind models of full bottomed ships JBC and KVLCC2. Difficulties with prediction of the ship resistance by hybrid methods are discussed.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"83 - 96"},"PeriodicalIF":2.2,"publicationDate":"2019-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2019.1574965","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42932931","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: 11
From data to insight for a polar supply and research vessel 从数据到洞察极地补给和研究船
IF 2.2
Ship Technology Research Pub Date : 2019-01-02 DOI: 10.1080/09377255.2018.1464241
A. Bekker, M. Suominen, P. Kujala, Rosca Johan Oscar De Waal, K. Soal
{"title":"From data to insight for a polar supply and research vessel","authors":"A. Bekker, M. Suominen, P. Kujala, Rosca Johan Oscar De Waal, K. Soal","doi":"10.1080/09377255.2018.1464241","DOIUrl":"https://doi.org/10.1080/09377255.2018.1464241","url":null,"abstract":"ABSTRACT Full-scale measurements on polar research vessels present an opportunity to advance the state-of-the-art in ship design through high-quality long-term measurements of environmental conditions and ship responses. The approaches, data analytics and synoptic results are presented for a comprehensive measurement campaign on a modern polar supply and research vessel, the SA Agulhas II. It is recognised that the real-time analysis and utilisation of such measurements could benefit the insightful operation and management of this vessel. To this end, the conceptual design of a monitoring and decision-aiding system is presented. Results indicate that significant potential beckons in the integrated acquisition, analysis and utilisation of full-scale ship-board measurements provided that this diverse data can be aggregated, analysed, visualised and interpreted in real time.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"57 - 73"},"PeriodicalIF":2.2,"publicationDate":"2019-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1464241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44391333","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: 13
On the relation of added mass and added resistance due to wall interference 壁面干涉引起的附加质量与附加阻力的关系
IF 2.2
Ship Technology Research Pub Date : 2018-12-11 DOI: 10.1080/09377255.2018.1556496
S. Schubert, T. Rung
{"title":"On the relation of added mass and added resistance due to wall interference","authors":"S. Schubert, T. Rung","doi":"10.1080/09377255.2018.1556496","DOIUrl":"https://doi.org/10.1080/09377255.2018.1556496","url":null,"abstract":"ABSTRACT This paper is devoted to the hydrodynamic interplay of rigid bodies in direct proximity. Emphasis is given to proximity influences on inertia and resistance forces. The numerical study employs an overset grid procedure, which accounts for the mechanical contact of rigid bodies, to investigate contact simulations of a circular cylinder and a sphere with a plane wall, which were previously analysed with less general approaches. Results obtained from the present study reveal a significant increase of the additional inertia and resistance forces when reducing the distance to the wall. Moreover, the results indicate that the proximity influence on the added mass and added resistance is coupled. While previous studies in the literature have not been able to capture the observed high-order influences, the derived formulae provide simple corrections of the baseline values that can easily be transferred to wetted structural simulations.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"97 1","pages":"117 - 134"},"PeriodicalIF":2.2,"publicationDate":"2018-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1556496","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59903850","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
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