It is critical to be able estimate a ship׳s response waves, since the resulting added resistance and loss of speed may cause delays or course alterations, with consequent financial repercussions. Slow steaming has recently become popular approach for commercial vessels, as way reducing fuel consumption, therefore operating costs, in current economic regulatory climate. Traditional methods study ship motions are based on potential flow theory cannot incorporate viscous effects. Fortunately,...

This article explores an automated approach for the efficient placement of substations and design inter-array electrical collection network offshore wind farm through minimization cost. To accomplish this, problem is represented as a number sub-problems that are solved in series using combination heuristic algorithms. The overall first by clustering turbines to generate valid substation positions. From navigational mesh pathfinding algorithm based on Delaunay triangulation applied identify...

This article explores the application of a wind farm layout evaluation function and optimization framework to Middelgrunden in Denmark. has been built considering interests developers order aid planning future offshore farms using UK Round 3 as point reference calibrate model. The present work applies developed tool estimate cost, energy production, levelized cost for existing as-built at farm; comparing these against production reported by operator. From here, new layouts have then designed...

This article explores the application of a wind farm layout optimization framework using particle swarm optimizer to three benchmark test cases. The developed introduces an increased level detail characterizing impact that can have on levelized cost energy by modelling farm's electrical infrastructure, annual production, and as functions layout. Using this framework, paper problem considering different levels constraint faced modern developers. is found yield improvements in with respect for...

A modular framework for the optimisation of an offshore wind farm using a discrete genetic algorithm is presented.This approach uses bespoke grid generation to define positions that turbines may occupy thereby implicitly satisfying navigational and search rescue constraints through farm.The presented methodology takes holistic optimising both turbine placement intra-array cable network, while minimising levelised cost energy real world constraints.This tool therefore integrates models...

This article explores the application of a binary genetic algorithm and particle swarm optimizer to optimization an offshore wind farm layout. The framework developed as part this work makes use modular design include detailed assessment farm’s layout including validated analytic wake modeling, cost assessment, necessary electrical infrastructure considering constraints. study has found that both algorithms are capable optimizing layouts with respect levelized energy when using detailed,...

Abstract A nonlinear mathematical model is developed in the time domain to simulate behaviour of two identical flexibly mounted cylinders tandem while undergoing vortex-induced vibration (VIV). Subsequently, validated and modified against experimental results. Placing an array bluff bodies proximity frequently happens different engineering fields. Chimney stacks, power transmission lines oil production risers are few structures that may be impacted by VIV. The coinciding frequency with...

There has been a lot of interest in trim optimisation to reduce fuel consumption and emissions ships. Many existing ships are designed for single operational condition with the aim producing low resistance at their design speed draft an even keel. Given that ship will often sail outside this over its life moreover some vessels such as LNG carriers return ballast one leg, effect on be significant. Ship optimization analysis traditionally done through towing tank testing. Computational...

This study is aimed to improve Zarnick's (1978, A nonlinear mathematical model of motions a planing boat in regular waves. David W. Taylor Naval Ship Research and Development Center, Bethesda, MD, USA) analytical for vessels. time domain was developed dynamic behaviour longitudinal motion high-speed crafts based on two-dimensional strip theory method using expanding wedge momentum. Due the nonlinearity complex these vessels, time-domain simulation adopted. Total resistance, heave pitch as...

Ship resistance is very important in terms of ship performance and fuel consumption. The more a has, the it consumes for same range. can be broken into two parts; frictional residuary resistance. Especially merchant ships which sail with normal or low velocity, may 60-90% total directly affected by surface roughness; namely physical biological roughness. Hull roughness leads to increase means penalty. Marine coatings are widely used order avoid minimise fouling hull roughness, hence This...

The need to develop an integrated dynamic safety and risk analysis model for decommissioning offshore jacket structures is driven by the risky, expensive complex nature of operation. Many existing techniques applicable assets failed recognise capture evolving risks during different stages This paper describes risk-based conduct quantitative failure. First, a bow-tie technique developed accident cause-consequence relationship. Subsequently, Bayesian belief network used update failure...