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| 1 | Fuzzy fault tree analysis of oil and gas leakage in subsea production systems显示文摘This paper presents a probabilistic failure analysis of leakage of the oil and gas in a subsea production system using fault tree analysis(FTA).A fault tree was constructed by considering four major areas where the leakages can be initiated.These are:gas and oil wells,pipelines,key facilities and third party damage.Conventional FTA requires precise values for the probability of failure of the basic events.However,since the failure data are uncertain,a fuzzy approach to these data is taken which leads to the so-called fuzzy fault tree analysis(FFTA),a method that employs expert elicitation and fuzzy set theories to calculate the failure probabilities of the intermediate events and the top event through identification of the minimal cut sets of the fault tree.A number of importance measures for minimal cut sets and the basic events have been obtained which helps to identify the nature of dependence of the top event on the basic events and thereby can identify the weakest links that may cause leakage in the subsea production system. | A.S.Cheliyan S.K.Bhattacharyya | 2018 | Journal of Ocean Engineering and Science2018，3，1： | 10 |
| 2 | On the estimation of ship’s fuel consumption and speed curve:A statistical approach显示文摘When fuel efficiency is at stake,along with the reduction of the environmental foot print of air pollution,a need is presented to estimate a ship’s fuel consumption for a forthcoming voyage,and means for decision making and for cost saving.This paper suggests an operational approach for obtaining an accurate fuel consumption and speed curve,on the basis of major factors affecting it,namely,ship’s draft and displacement,weather force and direction,hull and propeller roughness.A statistical analysis on 418 noon reports of a Pure Car and Truck Carrier case ship is carried out and the influence of the above factors is calculated.As expected,stronger wind and head weather increases the fuel consumption,and the difference between several weather conditions could be quantified.A simple and accurate algorithm is proposed in order for ship owners,managers and operators to be in a position to apply the suggested method on their fleet.Finally,applications of the structured algorithm are introduced with examples,in estimating the fuel consumption of the case ship for a future voyage,and also the same for a sister ship.Furthermore,voyage planning in several scenarios is proposed in order to assist the stakeholders with decision making aimed to fuel saving and environmental friendliness of their ships. | Nicolas Bialystocki Dimitris Konovessis | 2016 | Journal of Ocean Engineering and Science2016，1，2： | 8 |
| 3 | Minimizing transmission loss using inspired ant colony optimization and Markov Chain Monte Carlo in underwater WSN environment显示文摘In Underwater Wireless Sensor Networks(UWSNs),the most important challenging issues are propagation delay,high error probability,high latency,high communication cost,limited bandwidth,limited memory,low packet delivery ratio,and transmission loss.In our proposed work,the various efforts are taken to minimize the propagation delay and transmission loss during data transmission in an underwater environment.A hybrid mechanism is implemented to improve energy efficiency for faster data transmission in underwater WSN.In the underwater environment of acoustic channel condition,propagation delay and transmission loss lead to high complexity in accessing the information and also it is difficult to obtain the Channel Status Information(CSI).To address this problem,Ant Colony Optimization(ACO)routing with Markov Chain Monte Carlo(MCMC)algorithm is used and to capture the transmission loss in the MCMC approach,CSI Forecast Prediction(FP)algorithm is used.The experimental simulations are evaluated by utilizing the performance evaluation metrics such as Transmission Loss,Probability Density Function,Average Delay and Throughput.From the simulation results it is evident that the proposed algorithm,ACO-MCMC has recorded the minimum transmission loss,increase in probability density function,minimum average delay and maximum throughput of the network when compared to the existing algorithms. | Raj Priyadarshini R Sivakumar N | 2019 | Journal of Ocean Engineering and Science2019，4，4： | 7 |
| 4 | Comparative numerical and experimental study of two combined wind and wave energy concepts显示文摘With a successful and rapid development of offshore wind industry and increased research activities on wave energy conversion in recent years,there is an interest in investigating the technological and economic feasibility of combining offshore wind turbines(WTs)with wave energy converters(WECs).In the EU FP7 MARINA Platform project,three floating combined concepts,namely the spar torus combination(STC),the semi-submersible flap combination(SFC)and the oscillating water column(OWC)array with a wind turbine,were selected and studied in detail by numerical and experimental methods.This paper summarizes the numerical modeling and analysis of the two concepts:STC and SFC,the model tests at a 1:50 scale under simultaneous wave and wind excitation,as well as the comparison between the numerical and experimental results.Both operational and survival wind and wave conditions were considered.The numerical analysis was based on a time-domain global model using potential flow theory for hydrodynamics and blade element momentum theory(for SFC)or simplified thrust force model(for STC)for aerodynamics.Different techniques for model testing of combined wind and wave concepts were discussed with focus on modeling of wind turbines by disk or redesigned small-scale rotor and modeling of power take-off(PTO)system for wave energy conversion by pneumatic damper or hydraulic rotary damper.In order to reduce the uncertainty due to scaling,the numerical analysis was performed at model scale and both the numerical and experimental results were then up-scaled to full scale for comparison.The comparison shows that the current numerical model can well predict the responses(motions,PTO forces,power production)of the combined concepts for most of the cases.However,the linear hydrodynamic model is not adequate for the STC concept in extreme wave conditions with the torus fixed to the spar at the mean water level for which the wave slamming on the torus occurs and this requires further investigation.Moreover,based on a preliminary comparison of the displacement,the PTO system as well as the wind and wave power production,the STC concept will have a lower cost of energy as compared to the SFC concept.However,the cost of energy of either the STC or the SFC concept is higher than that of a pure floating wind turbine with the same floater. | Zhen Gao Torgeir Moan Ling Wan Constantine Michailides | 2016 | Journal of Ocean Engineering and Science2016，1，1： | 7 |
| 5 | Approximation of surface-groundwater interaction mediated by vertical streambank in sloping terrains显示文摘New analytical solutions are derived to estimate the interaction of surface and groundwater in a stream-aquifer system.The analytical model consists of an unconfined sloping aquifer of semi-infinite extant,interacting with a stream of varying water level in the presence of a thin vertical sedimentary layer of lesser hydraulic conductivity.Flow of subsurface seepage is characterized by a nonlinear Boussinesq equation subjected to mixed boundary conditions,including a nonlinear Cauchy boundary condition to approximate the flow through the sedimentary layer.Closed form analytical expressions for water head,discharge rate and volumetric exchange are derived by solving the linearized Boussinesq equation using Laplace transform technique.Asymptotic cases such as zero slope,absence of vertical clogging layer and abrupt change in stream-stage can be derived from the main results by taming one or more parameters.Analytical solutions of the linearized Boussinesq equation are compared with numerical solution of corresponding nonlinear equation to assess the validity of the linearization.Advantages of using a nonlinear Robin boundary condition,and combined effects of aquifer parameters on the bank storage characteristic of the aquifer are illustrated with a numerical example. | Rajeev K.Bansal | 2017 | Journal of Ocean Engineering and Science2017，2，1： | 6 |
| 6 | A framework for efficient irregular wave simulations using Higher Order Spectral method coupled with viscous two phase model显示文摘In this paper a framework for efficient irregular wave simulations using Higher Order Spectral method coupled with fully nonlinear viscous,two-phase Computational Fluid Dynamics(CFD)model is presented.CFD model is based on solution decomposition via Spectral Wave Explicit Navier-Stokes Equation method,allowing efficient coupling with arbitrary potential flow solutions.Higher Order Spectrum is a pseudo-spectral,potential flow method for solving nonlinear free surface boundary conditions up to an arbitrary order of nonlinearity.It is capable of efficient long time nonlinear propagation of arbitrary input wave spectra,which can be used to obtain realistic extreme waves.To facilitate the coupling strategy,Higher Order Spectrum method is implemented in foam-extend alongside the CFD model.Validation of the Higher Order Spectrum method is performed on three test cases including monochromatic and irregular wave fields.Additionally,the coupling between Higher Order Spectrum and CFD is validated on three hour irregular wave propagation.Finally,a simulation of a 3D extreme wave encountering a full scale container ship is shown. | Inno Gatin Vuko Vukčević Hrvoje Jasak | 2017 | Journal of Ocean Engineering and Science2017，2，4： | 5 |
| 7 | Prediction of regular wave loads on a fixed offshore oscillating water column-wave energy converter using CFD显示文摘In this paper,hydrodynamic wave loads on an offshore stationary-floating oscillating water column(OWC)are investigated via a 2D and 3D computational fluid dynamics(CFD)modeling based on the RANS equations and the VOF surface capturing scheme.The CFD model is validated against previous experiments for nonlinear regular wave interactions with a surface-piercing stationary barge.Following the validation stage,the numerical model is modified to consider the pneumatic damping effect,and an extensive campaign of numerical tests is carried out to study the wave-OWC interactions for different wave periods,wave heights and pneumatic damping factors.It is found that the horizontal wave force is usually larger than the vertical one.Also,there a direct relationship between the pneumatic and hydrodynamic vertical forces with a maximum vertical force almost at the device natural frequency,whereas the pneumatic damping has a little effect on the horizontal force.Additionally,simulating the turbine damping with an orifice plate induces higher vertical loads than utilizing a slot opening.Furthermore,3D modeling significantly escalates and declines the predicted hydrodynamic vertical and horizontal wave loads,respectively. | Ahmed Elhanafi | 2016 | Journal of Ocean Engineering and Science2016，1，4： | 5 |
| 8 | Traveling wave solutions to some nonlinear fractional partial differential equations through the rational(G'/G)-expansion method显示文摘In this article,the analytical solutions to the space-time fractional foam drainage equation and the space-time fractional symmetric regu-larized long wave(SRLW)equation are successfully examined by the recently established rational(G/G)-expansion method.The suggested equations are reduced into the nonlinear ordinary differential equations with the aid of the fractional complex transform.Consequently,the theories of the ordinary differential equations are implemented effectively.Three types closed form traveling wave solutions,such as hyper-bolic function,trigonometric function and rational,are constructed by using the suggested method in the sense of conformable fractional derivative.The obtained solutions might be significant to analyze the depth and spacing of parallel subsurface drain and small-amplitude long wave on the surface of the water in a channel.It is observed that the performance of the rational(G/G)-expansion method is reliable and will be used to establish new general closed form solutions for any other NPDEs of fractional order. | Tarikul Islam M.Ali Akbar Abul Kalam Azad | 2018 | Journal of Ocean Engineering and Science2018，3，1： | 5 |
| 9 | A review of stress concentration factors in tubular and non-tubular joints for design of offshore installations显示文摘Tubular structures are widely used in offshore installations,trusses,high rise buildings,towers for wind turbines,ski-lift installations,lightning,road pole signals etc.,owing to their excellent structural performance and attractive appearance.Stress concentration,especially in the welded joints of these structures,is an important design consideration particularly for fatigue design.In the context of tubular and non-tubular joints,this paper provides a review of the experimental and numerical studies that have been carried out so far to determine the stress concentration factor(SCF).Emphasis is also placed on the complexity of capturing different types of stresses in tubular/non-tubular joints for estimation of SCF.Present code provisions for evaluation of SCF are also discussed.Further,a few issues,which require significant research effort to advance our understanding and to improve the current design guidelines,have been identified.©2016 Shanghai Jiaotong University.Published by Elsevier B.V. | Dikshant Singh Saini Debasis Karmakar Samit Ray-Chaudhuri | 2016 | Journal of Ocean Engineering and Science2016，1，3： | 4 |
| 10 | Non-linear buckling analysis of imperfect thin spherical pressure hull for manned submersible显示文摘Thin spherical pressure hulls are used as a human occupancy in deep water applications.DNV and other standards specify the imperfection allowed for pressure hulls.Numerical analyses are carried out to find the buckling pressure for both perfect and imperfect thin spherical pressure hulls,considering the geometric and material non-linearities.It is observed that there is a huge variation in the elastic and inelastic buckling pressure in perfect spherical pressure hulls.Moreover,if the manufacturing imperfections are considered in the inelastic numerical analysis,still there is a reduction in the buckling pressure.Design criteria,for deep water pressure hulls,is that both buckling pressure and yield pressure must be greater than the design pressure.In the elastic analysis,if t/D>0.006 buckling pressure is always greater than the yield pressure whereas in the inelastic analysis,the buckling pressure is falling below the yield pressure for all t/D ratios.Hence,inelastic numerical analysis with manufacturing imperfection has to considered in the design of deep water spherical pressure hulls of manned submersibles. | SB.Pranesh Deepak Kumar V.Anantha Subramanian D.Sathianarayanan GA.Ramadass | 2017 | Journal of Ocean Engineering and Science2017，2，4： | 4 |
| 11 | Two efficient reliable methods for solving fractional fifth order modified Sawada-Kotera equation appearing in mathematical physics显示文摘The present paper deals with two reliable efficient methods viz.tanh-sech method and modified Kudryashov method,which are used to solve time-fractional nonlinear evolution equation.For delineating the legitimacy of proposed methods,we employ it to the time-fractional fifth-order modified Sawada-Kotera equations.As a consequence,we effectively obtained more new exact solutions for time-fractional fifth-order modified Sawada-Kotera equation.We have also presented the numerical simulations for time-fractional fifth-order modified Sawada-Kotera equation by means of three dimensional plots. | S.Saha Ray S.Sahoo | 2016 | Journal of Ocean Engineering and Science2016，1，3： | 4 |
| 12 | Traveling wave solutions for shallow water equations显示文摘An extended homogeneous balance method is suggested in this paper.Based on computerized symbolic computation and the homogeneous balance method,new exact traveling wave solutions of nonlinear partial differential equations(PDEs)are presented.The shallow-water equations represent a simple yet realistic set of equations typically found in atmospheric or ocean modeling applications,we consider the exact solutions of the nonlinear generalized shallow water equation and the fourth order Boussinesq equation.Applying this method,with the aid of Mathematica,many new exact traveling wave solutions are successfully obtained. | U.M.Abdelsalam | 2017 | Journal of Ocean Engineering and Science2017，2，1： | 4 |
| 13 | New exact solutions of coupled Boussinesq-Burgers equations by Exp-function method显示文摘In the present paper,we build the new analytical exact solutions of a nonlinear differential equation,specifically,coupled Boussinesq-Burgers equations by means of Exp-function method.Then,we analyze the results by plotting the three dimensional soliton graphs for each case,which exhibit the simplicity and effectiveness of the proposed method.The primary purpose of this paper is to employ a new approach,which allows us victorious and efficient derivation of the new analytical exact solutions for the coupled Boussinesq-Burgers equations. | L.K.Ravi S.Saha Ray S.Sahoo | 2017 | Journal of Ocean Engineering and Science2017，2，1： | 4 |
| 14 | Modified(G'/G)-expansion method for finding traveling wave solutions of the coupled Benjamin-Bona-Mahony-KdV equation显示文摘Using the Lie symmetry approach,the author has examined traveling wave solutions of coupled Benjamin-Bona-Mahony-KdV equation.The coupled Benjamin-Bona-Mahony-KdV equation is reduced to nonlinear ordinary differential equations for all optimal subalgebras by using Lie classical symmetries and various solutions are obtained by the modified(G'/G)-expansion method.Further,with the aid of solutions of the nonlinear ordinary differential equations,more explicit traveling wave solutions of the coupled Benjamin-Bona-Mahony-KdV equation are found out.The traveling wave solutions are expressed by rational function. | Vikas Kumar | 2019 | Journal of Ocean Engineering and Science2019，4，3： | 4 |
| 15 | A modeling method for vibration analysis of cracked beam with arbitrary boundary condition显示文摘This paper establishes a cracked Timoshenko beams model to investigate the vibration behavior based on the ultraspherical polynomials.Timoshenko beam theory is applied to model the free vibration analysis of the cracked beam and the numerical results are obtained by using ultraspherical orthogonal polynomials.The boundary conditions of both ends of the cracked beam are modeled as the elastic spring and the beam is divided into two parts by the crack section,and continuous conditions at the connecting face are modeled by the inverse of the flexibility coefficients of fracture mechanics theory.Ignoring the influence of boundary conditions,displacements admissible functions of cracked Timoshenko beam can be set up as ultraspherical orthogonal polynomials.The accuracy and robustness of the present method are evidenced through comparison with previous literature and the results achieved by the finite element method(FEM).In addition,the effects of flexibility coefficient on the natural frequencies are also investigated by using the proposed method.Numerical examples are given for free vibration analysis of cracked beams with various boundary conditions,which may be provided as reference data for future study. | Kwanghun Kim Sok Kim Kyongjin Sok Chanil Pak Kwangbok Han | 2018 | Journal of Ocean Engineering and Science2018，3，4： | 4 |
| 16 | Multiple soliton solutions for the (3+1) conformable space-time fractional modified Korteweg-de-Vries equations显示文摘In the present paper,multiple exact soliton solutions for the old and the newly introduced(3+1)-dimensional modified Korteweg-de-Vries equation(mKdV)will be sought.The mKdV equations considered feature fractional derivative orders in both the space and time variables.A variety of soliton solutions ranging from hyperbolic to periodic function solutions will be constructed using simple ansatze for the equations.Finally,the algebraic equations to be obtained along the way and graphical representations will be carried out by utilizing the Mathematica software. | R.I.Nuruddeen | 2018 | Journal of Ocean Engineering and Science2018，3，1： | 4 |
| 17 | Two effective approaches for solving fractional generalized Hirota-Satsuma coupled KdV system arising in interaction of long waves显示文摘In this article,two different methods,namely sub-equation method and residual power series method,have been used to obtain new exact and approximate solutions of the generalized Hirota-Satsuma system of equations,which is a coupled KdV model.The fractional derivative is taken in the conformable sense.Each of the obtained exact solutions were checked by substituting them into the corresponding system with the help of Maple symbolic computation package.The results indicate that both methods are easy to implement,effective and reliable.They are therefore ready to apply for various partial fractional differential equations. | Ali Kurt Hadi Rezazadeh Mehmet Senol Ahmad Neirameh Orkun Tasbozan Mostafa Eslami Mohammad Mirzazadeh | 2019 | Journal of Ocean Engineering and Science2019，4，1： | 3 |
| 18 | Effects of fixed and dynamic mesh methods on simulation of stepped planing craft显示文摘In the present study,we investigate the effects of fixed and dynamic mesh methods on CFD simulation of stepped planing craft.To this accomplishment,three different body forms of without step,one step,and two step Cougar planing crafts are considered.Three-dimensional CFD analysis is conducted using finite volume method(FVM).Volume of fluid(VOF)model is used for free surface modeling.Overset mesh technique(dynamic mesh)and fixed mesh method are conducted by STAR CCM and ANSYS CFX CFD toolboxes,respectively.CFD results of total hydrodynamic resistance and dynamic trim angle are compared against our measured experimental data to assess the performance and accuracy of considered mesh methods.For more details,pressure distributions,wave patterns and streamlines around the hull models are also presented.Based on our CFD results,dynamic mesh method is more accurate and precise to simulate the stepped planing crafts compared to fixed mesh method.However,computational cost for dynamic mesh method is significantly greater than the fixed mesh method.We also found that the porpoising phenomenon is only detectable using dynamic mesh method in simulation of stepped Cougar planing craft.©2018 Shanghai Jiaotong University.Published by Elsevier B.V. | M.Mehdi Doustdar Hamid Kazemi | 2019 | Journal of Ocean Engineering and Science2019，4，1： | 3 |
| 19 | Using artificial neural network to predict velocity of sound in liquid water as a function of ambient temperature, electrical and magnetic fields显示文摘One of the main thermophysical properties of liquid water is velocity of sound.However,the effect of different externalities on velocity of sound in liquid water is not well known.Therefore,in current study,by designing an artificial neural network(ANN)velocity of sound in liquid water under different externalities is predicted.Selected externalities are ambient temperature from 272.65 K to 348.43 K,different electrical fields in range of 0 V/m to 4.03E+9 V/m and magnetic fields in range of 0-10.0594 T.To prepare of reference dataset for entry to ANN,numerical and experimental data as macroscopic reference data are extracted from microscopic characteristic of water HB strength.In order to achieve an appropriate ANN,ANN architecture sensitivity analysis is conducted by using an iterative algorithm.Learning procedure in the selected feed-forward back propagation ANN is done by hyperbolic transfer functions.Also,Levenberg-Marquardt algorithm is utilized for the optimization process.ANNs output showed that the maximum MSE in prediction of velocity of sound is 0.00066.Also,the minimum of correlation coefficient in prediction of velocity of sound is 0.99131.Based on the ANNs outputs,weights and bias,an equation to predict of velocity of sound in liquid water under intended externalities is proposed.Also,according to weight sensitivity analysis input of electrical fields with 63%relative importance percentage has a grater impression on the response variable of velocity of sound in liquid water.©2016 Shanghai Jiaotong University.Published by Elsevier B.V. | Hashem Nowruzi Hassan Ghassemi | 2016 | Journal of Ocean Engineering and Science2016，1，3： | 3 |
| 20 | RANSE-based simulation and analysis of scale effects on open-water performance of the PPTC-II benchmark propeller显示文摘This paper presents our numerical study of the scale effects on a tip-rake propeller,the PPTC-II,based on the RANS simulations using software FLUENT 6.3.The low Re option in SST k-ωmodel is adopted at model scale,together with fine prism grids to resolve the viscous sub-layer.At full scale,standard wall function is adopted.The scale-effect corrections yielded by our RANS simulations are compared with those obtained from the ITTC method.To explain the CFD results,an analysis of sectional forces is performed.To investigate how the tip rake influences propeller scale effects,the geometry of PPTC-II is modified by removing the tip rake only,and the RANS-predicted scale effects for the modified propeller,PPTC-II-m,are compared with those for the PPTC-II.The study indicates that the scale effect on propeller thrust can be as important as that on the torque;somehow the RANS-and ITTC-based predictions for full-scale efficiency agree quite well;the tip-rake reduces tip loading and tip vortex strength,and brings about large differences in the scale effects as compared with the propeller without tip-rake. | Xiao-Qian Dong Wei Li Chen-Jun Yang Francis Noblesse | 2018 | Journal of Ocean Engineering and Science2018，3，3： | 3 |
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