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A simplified welding simulation approach used to design a fatigue test specimen containing residual stresses 采用简化的焊接模拟方法设计含残余应力的疲劳试样
IF 2.2
Ship Technology Research Pub Date : 2018-09-06 DOI: 10.1080/09377255.2018.1518692
N. Friedrich, S. Ehlers
{"title":"A simplified welding simulation approach used to design a fatigue test specimen containing residual stresses","authors":"N. Friedrich, S. Ehlers","doi":"10.1080/09377255.2018.1518692","DOIUrl":"https://doi.org/10.1080/09377255.2018.1518692","url":null,"abstract":"ABSTRACT Although it is known that residual stresses may influence the fatigue strength of welded structures, they are usually not included explicitly in fatigue assessments. Experimental investigations on the influence welding residual stresses have on fatigue are complicated by the fact that small-scale specimens often show only little tensile residual stresses. In practice, residual stresses are usually not known and difficult to determine. Welding simulation approaches usually demand for experimental calibration making them unsuitable for residual stress predictions. The reliability of their results is however limited. Therefore, a welding simulation approach applying uniform temperatures without experimental calibration was proposed. Different input parameters were varied to determine their influence on the calculated residual stresses. The approach was then used to design a small-scale fatigue test specimen showing tensile residual stress at the weld. Specimens were produced based on the simulation results and residual stress measurements were compared to the calculated values.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"22 - 37"},"PeriodicalIF":2.2,"publicationDate":"2018-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1518692","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47423673","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: 3
Computation of the free vortex system of multi-component propulsors 多组分推进器自由旋涡系统的计算
IF 2.2
Ship Technology Research Pub Date : 2018-09-06 DOI: 10.1080/09377255.2018.1500741
S. Krüger
{"title":"Computation of the free vortex system of multi-component propulsors","authors":"S. Krüger","doi":"10.1080/09377255.2018.1500741","DOIUrl":"https://doi.org/10.1080/09377255.2018.1500741","url":null,"abstract":"ABSTRACT A method is presented to compute the geometry of the free vortex system of single- and multi-component propulsors. The method is based on the numerical integration of the Biot-Savart law for the induced velocities, which is equivalent to the numerical computation of the Goldstein factor. The computations have been extended for helix pitches close to zero and to infinity. On the basis of these new Goldstein factors, the shape of the free vortex system of all kinds of propulsors can easily be obtained, including possible interactions of the different free vortex systems. This approach can in a later stage be used for any numerical propulsor method which requires the free vortex locations or the propulsor interactions as input. The application to propeller rudder interaction has shown some interesting aspects which can be useful for the design of rudder sections.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"1 - 8"},"PeriodicalIF":2.2,"publicationDate":"2018-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1500741","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49222354","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: 3
Influence of resonance on the performance of semi-active flapping propulsor 共振对半主动扑动推进器性能的影响
IF 2.2
Ship Technology Research Pub Date : 2018-06-21 DOI: 10.1080/09377255.2018.1487667
Surasak Phoemsapthawee, N. Thaweewat, V. Juntasaro
{"title":"Influence of resonance on the performance of semi-active flapping propulsor","authors":"Surasak Phoemsapthawee, N. Thaweewat, V. Juntasaro","doi":"10.1080/09377255.2018.1487667","DOIUrl":"https://doi.org/10.1080/09377255.2018.1487667","url":null,"abstract":"ABSTRACT A semi-active flapping foil, which is a heaving foil attached to a torsional spring, efficiently generates thrust. In this report, the propulsive characteristics of such foils are studied using a boundary element method. The numerical investigation is performed to clarify the effects of foil inertia and resonance. It is found that the flapping propulsor is efficient over a wide range of operating conditions. The peak efficiencies occur approximately at an identical advance number and also correspond to the same pitch amplitude in spite of different inertia. The present study also supports that the immersed resonance is relevant to the optimal performance. On the other hand, the propulsive characteristics of all foils are identical regardless of foil inertia when structurally resonated. An evidence has been found that the foil can also perform as an energy harvester in a certain range of operating condition.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"67 1","pages":"51 - 60"},"PeriodicalIF":2.2,"publicationDate":"2018-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1487667","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43622670","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
Numerical simulation of the free-running of a ship using the propeller model and dynamic overset grid method 采用螺旋桨模型和动态超调网格法对船舶自由航行进行数值模拟
IF 2.2
Ship Technology Research Pub Date : 2018-06-11 DOI: 10.1080/09377255.2018.1482610
K. Ohashi, Hiroshi Kobayashi, T. Hino
{"title":"Numerical simulation of the free-running of a ship using the propeller model and dynamic overset grid method","authors":"K. Ohashi, Hiroshi Kobayashi, T. Hino","doi":"10.1080/09377255.2018.1482610","DOIUrl":"https://doi.org/10.1080/09377255.2018.1482610","url":null,"abstract":"ABSTRACT An unsteady Reynolds averaged Navier-Stokes (URANS) solver to estimate the trajectory on the free-running condition of a conventional ship is developed. Ship motions are obtained by solving the motion equations and accounted for by the moving grid technique. Propeller effects are accounted for by the body forces that are derived from the propeller model, which is based on the potential theory. The prescribed rudder motions of typical free-running conditions are accounted for using the dynamic overset grid method, in which the overset information is updated at each temporal step by implementing the existing overset grid method as the numerical library. The flow around the ship hull during the turning motions is analysed, and strong interactions between the ship hull and rudder in the propeller accelerated flows are observed. Through comparisons, the present method shows its applicability to compute the flow around a ship in free-running motion.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"65 1","pages":"153 - 162"},"PeriodicalIF":2.2,"publicationDate":"2018-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1482610","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42950099","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: 9
Comparison and validation of numerical methods to assess hydrodynamic loads on mechanical coupling of multiple bodies 多体机械耦合水动力载荷数值评估方法的比较与验证
IF 2.2
Ship Technology Research Pub Date : 2018-06-05 DOI: 10.1080/09377255.2018.1482100
Mahdi Ghesmi, A. von Graefe, V. Shigunov, B. Friedhoff, O. el Moctar
{"title":"Comparison and validation of numerical methods to assess hydrodynamic loads on mechanical coupling of multiple bodies","authors":"Mahdi Ghesmi, A. von Graefe, V. Shigunov, B. Friedhoff, O. el Moctar","doi":"10.1080/09377255.2018.1482100","DOIUrl":"https://doi.org/10.1080/09377255.2018.1482100","url":null,"abstract":"ABSTRACT In the design of articulated systems, accurate prediction of loads on mechanical couplings is important for the dimensioning of the coupling, as well as an assessment of local and global structural loads. The paper studies a twofold pushing convoy in shallow water. Several numerical approaches for the prediction of articulation loads are compared with each other and with model tests. Kinematic constraints are applied to couple the bodies at articulation points to model hinge and rigid mechanical couplings. For comparison, contact elements are also used to simulate hinges. Depending on the articulation model numerical computations are conducted in frequency or time domain. Comparison between different numerical methods and with model experiments shows that the proposed methods can predict articulation loads with sufficient accuracy for design purposes. The frequency domain approach with kinematic constraints seems more suitable to compute the hinge coupling forces than time-domain simulations with contact elements.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"66 1","pages":"21 - 9"},"PeriodicalIF":2.2,"publicationDate":"2018-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1482100","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43617331","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: 6
A panel method for floating offshore wind turbine simulations with fully integrated aero- and hydrodynamic modelling in time domain 一种浮式海上风力机时域气动和水动力建模完全集成的面板模拟方法
IF 2.2
Ship Technology Research Pub Date : 2018-05-25 DOI: 10.1080/09377255.2018.1475710
S. Netzband, C. Schulz, U. Göttsche, D. Ferreira González, M. Abdel‐Maksoud
{"title":"A panel method for floating offshore wind turbine simulations with fully integrated aero- and hydrodynamic modelling in time domain","authors":"S. Netzband, C. Schulz, U. Göttsche, D. Ferreira González, M. Abdel‐Maksoud","doi":"10.1080/09377255.2018.1475710","DOIUrl":"https://doi.org/10.1080/09377255.2018.1475710","url":null,"abstract":"ABSTRACT The further development of the first-order panel method panMARE for simulating floating offshore wind turbines (FOWTs) in time domain is presented in this work. Based on a surface discretisation of platform, tower and rotor with its wake, the three-dimensional aerodynamic and hydrodynamic flow fields are calculated. A free wake deformation model is integrated to capture blade–wake interaction. Hydrodynamic, aerodynamic and mooring loads are cumulated by a six-degrees-of-freedom solver to compute the motion of the FOWT. The presented method is able to simulate unsteady and aperiodic motions and to predict the wake deformations and their influence on the rotor loads due to the platform motion. In order to verify the method, simulation results of the DeepCWind floater with the NREL 5-MW baseline turbine are compared with those obtained in the OC4 project. The ability to capture highly unsteady situations is studied as well by simulating a gust with varying length.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"65 1","pages":"123 - 136"},"PeriodicalIF":2.2,"publicationDate":"2018-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1475710","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44715329","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: 20
Numerical simulation of a laser-induced cavitation bubble near a solid boundary considering phase change 考虑相变的固体边界附近激光诱导空化气泡的数值模拟
IF 2.2
Ship Technology Research Pub Date : 2018-05-21 DOI: 10.1080/09377255.2018.1473235
H. Sagar, O. el Moctar
{"title":"Numerical simulation of a laser-induced cavitation bubble near a solid boundary considering phase change","authors":"H. Sagar, O. el Moctar","doi":"10.1080/09377255.2018.1473235","DOIUrl":"https://doi.org/10.1080/09377255.2018.1473235","url":null,"abstract":"ABSTRACT This paper documents the numerical investigation of the flow surrounding a collapsing laser-induced cavitation bubble with an initial radius of 1.45 mm. The three-dimensional laminar flow was captured by solving the Navier–Stokes equations. To account for the multiphase flow (water and vapour), the Volume of Fluid (VoF) method was used. The source term of the transport equation of the VoF function was based on the simplified Rayleigh–Plesset equation. The distance of the bubble from a solid surface wall was varied according to the dimensionless parameter D/Rmax ranging from 0.3 to 3.0, where Rmax is maximum bubble radius and D is the distance between bubble centre and solid surface. Computed collapse derivatives, impact velocity, impact pressure, and visual characteristics, such as toroidal shapes of oval impacts, agreed favourably to experimental measurements.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"65 1","pages":"163 - 179"},"PeriodicalIF":2.2,"publicationDate":"2018-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1473235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49245207","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: 17
A simulation-based ship design methodology for evaluating susceptibility to weather-induced delays during marine operations 一种基于模拟的船舶设计方法，用于评估海上作业中天气引起的延误的易感性
IF 2.2
Ship Technology Research Pub Date : 2018-05-16 DOI: 10.1080/09377255.2018.1473236
Endre Sandvik, M. Gutsch, B. Asbjørnslett
{"title":"A simulation-based ship design methodology for evaluating susceptibility to weather-induced delays during marine operations","authors":"Endre Sandvik, M. Gutsch, B. Asbjørnslett","doi":"10.1080/09377255.2018.1473236","DOIUrl":"https://doi.org/10.1080/09377255.2018.1473236","url":null,"abstract":"ABSTRACT In this paper, we present and test a discrete-event simulation approach for evaluating the inherent susceptibility to weather-induced delays during marine operations as a consequence of limitations in vessel response characteristics. The simulation routine replicates the execution of operations in a long-term perspective by applying weather data time series and vessel response-based operational criteria. Weather windows are taken as the basis for the operation startup criterion. A case study is presented where we examine the capabilities of the simulation methodology towards reflecting the inherent weather challenges in operational scenarios and the ability to distinguish between alternative design concepts. Comparison is performed towards the percentage operability method and integrated operability factor to uncover advantages of the presented approach. Application of the simulation methodology is found to yield further knowledge of the inherent operational persistence and weather delay susceptibility of proposed vessel designs in the early phases of ship design.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"65 1","pages":"137 - 152"},"PeriodicalIF":2.2,"publicationDate":"2018-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1473236","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44979426","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
Bonded window panes in strength analysis of ship structures 粘结窗板在船舶结构强度分析中的应用
IF 2.2
Ship Technology Research Pub Date : 2018-04-11 DOI: 10.1080/09377255.2018.1459066
B. Wiegard, S. Ehlers, O. Klapp, B. Schneider
{"title":"Bonded window panes in strength analysis of ship structures","authors":"B. Wiegard, S. Ehlers, O. Klapp, B. Schneider","doi":"10.1080/09377255.2018.1459066","DOIUrl":"https://doi.org/10.1080/09377255.2018.1459066","url":null,"abstract":"ABSTRACT Large windows and window strips are essential in the design of passenger ships and megayachts. But in strength and vibration analyses of the ship structure, the bonded window panes are generally ignored. This is commonly justified with the assumption that the neglect of the window panes leads to conservative results. In this paper, this assumption is analysed. Therefore, the interaction of the window panes with the ship structure was investigated experimentally with a full-scale test model. In addition, methods were developed to include bonded window panes into global Finite Element ship models. Finally, the effect of window panes was examined numerically in two megayacht models. The investigations showed that the window panes can cause a local stress reduction as well as a considerable local stress increase in the ship structure. Consequently, it is not always conservative to neglect the window panes in the analysis models.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"65 1","pages":"102 - 121"},"PeriodicalIF":2.2,"publicationDate":"2018-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1459066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42849974","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: 9
Predicting local ice loads on ship bow as a function of ice and operational conditions in the Southern Sea 以海冰和作业条件为函数预测南海船首局部冰负荷
IF 2.2
Ship Technology Research Pub Date : 2018-04-02 DOI: 10.1080/09377255.2018.1454390
Mikko Kotilainen, J. Vanhatalo, M. Suominen, P. Kujala
{"title":"Predicting local ice loads on ship bow as a function of ice and operational conditions in the Southern Sea","authors":"Mikko Kotilainen, J. Vanhatalo, M. Suominen, P. Kujala","doi":"10.1080/09377255.2018.1454390","DOIUrl":"https://doi.org/10.1080/09377255.2018.1454390","url":null,"abstract":"ABSTRACT Transportation in ice-prone waters is a timely topic because of the pursuit of natural resources and sea routes. S.A. Agulhas II voyaged in Antarctic waters during the austral summer of 2013–14. This paper studies how the local ice-induced loads on the ship bow are affected by different ice and operational conditions. A hierarchical Gaussian process model was used to study how the load distribution parameters change in different conditions. The operational conditions are described by ship speed, whereas the ice conditions varied from thin, first-year ice, to thick, multiyear ice. Because of this variation, the ice conditions are not represented by ice thickness alone but also by latitude, temperature and voyage time which represent the unmeasured ice strength. The predicted loads from the model match well with the measured loads. According to the model, loads increase in higher ship speed and ice thickness combination, further south, later in the summer and in higher temperatures.","PeriodicalId":51883,"journal":{"name":"Ship Technology Research","volume":"65 1","pages":"101 - 87"},"PeriodicalIF":2.2,"publicationDate":"2018-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09377255.2018.1454390","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45118145","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
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