Modelling of Hydro-Meteorological Parameters Using Spos Software in Order to Optimize Navigational Routes (original) (raw)
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The paper presents a multi-objective deterministic method of weather routing for sailing vessels. Depending on a particular purpose of sailboat weather routing, the presented method makes it possible to customize the criteria and constraints so as to fit a particular user’s needs. Apart from a typical shortest time criterion, safety and comfort can also be taken into account. Additionally, the method supports dynamic weather data: in its present version short-term, mid-term and long-term term weather forecasts are used during optimization process. In the paper the multi-objective optimization problem is first defined and analysed. Following this, the proposed method solving this problem is described in detail. The method has been implemented as an online SailAssistance application. Some representative examples solutions are presented, emphasizing the effects of applying different criteria or different values of customized parameters.
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In shipping industry, energy efficiency has become a major attention to reduce the fuel consumption and emission. One of the way to create those fuel savings is by optimizing the voyage by choosing the optimum speed for each suitable water area. Many ships are passing through canal to cut the voyage time or sometimes ship travels through river area, which is common for inland water transport. The influence of restricted water can be an issue to optimize the voyage. Referring to a work by Hafidh, a tool has been developed using the ship design parameter from a general cargo ship, which operates in a canal. The modelling of ship calm water resistance and additional resistance due to restricted water are processed using MATLAB-Simulink software. The tool is able to optimize the voyage by giving out the value of power and fuel consumed (€/nm) for a certain speed value under different water depth and breadth. The result of the analysis show that when the ship is operated in restricted water area with water depth 5 m, and water breadth 50 m, the power needed to achieve speed 7 knots is 150 kW higher than the power needed to achieve the same speed on water depth 7 m and water breadth 50 m. For a ship to go lower by 0.5 knots at 6.0 knots with water depth 3 m and water breadth 50 m, 221 € of fuel cost can be saved with other economic parameters considered as constant.
Development of Solution for Safe Ship Considering Seakeeping PERformance20200514 21389 1dzonuz
the International Journal on Marine Navigation and Safety of Sea Transportation, 2018
In recent years, safety of a ships has become one important issues needed to solved as soon as possible in ship navigation. Optimal weather routing is one of best solution for ensuring safe operation of a ship with a with short passage time or minimum energy to avoid a certain excessive motion. This paper introduced the development of solution for safety and optimal weather routing a ship considering seakeeping performance based on model test result. This study introduced how to apply A* algorithm based on result of the seakeeping model test for determining the optimal ship routes. Seakeeping model test of 8600 TEU container ship was carried out in Changwon National Universityʹs seakeeping basin and its RAOs at various frequencies were used to predict the RMS motion values in irregular waves. The specially modelled path‐cost function and the safety constraints were proposed for finding the optimal path of the ship. The comparison of ship performances estimated by great circle’s path and estimated optimal route during the voyage of the ship was investigated.
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Polish Maritime Research, 2018
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While operating the ship, one of the most important tasks is forecasting the ocean route. For this purpose, the speed characteristics of the ship are used, which are used in specialized computer systems and presented in publications. However, published algorithms for speed (or decrease of speed) calculations of a ship in real weather conditions on given routes are very simplified and do not contain all the relevant parameters related to the ship’s hull (affecting its resistance when sailing, eg on waves), its propulsion and weather conditions. The article presents its own, more detailed mathematical model of the speed of the ship, and the performed calculations of speed of the ship were compared with the algorithms available in the literature and with the records from the ship’s log.
Towards Improving Optimised Ship Weather Routing
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The aim of the paper is to outline a project focussing on the development of a new type of ship weather routing solution with improved uncertainty handling, through better estimation of ship performance and responses to sea conditions. Ensemble forecasting is considered to take into account the uncertainty levels that are typical of operations in a stochastic environment. Increased accuracy of weather prediction is achieved through the assimilation of real-time data, measured by an on-board monitoring system. The proposed system will allow smooth integration of short-term Decision Support Systems for ship handling in dangerous or peculiar situations with long-term Decision Support Systems for weather routing. An appropriate user interface is also a critical part of the project and it will be implemented in a commercial Electronic Nautical Chart environment. A prototype of the full system will be installed and tested on a commercial vessel in regular operations and under real environ...