Development of a Decision-Support Tool for Suggesting the Optimum Ship Speed under Irregular Sea and Weather Conditions with Different Drafts (original) (raw)
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Journal of Marine Science and Technology, 2019
A ship needs to be optimized for cost-effectiveness, operational efficiency, improved safety, comfort of passengers and crew, and for minimum environmental impact. Many of these requirements are contradicting and a decision regarding the optimal ship design needs to be made, based as far as possible on rational criteria and procedures. This is the case for the problem which the SHOPERA project is dealing with. Environmental concern was the reason behind the introduction of the Energy Efficiency Design Index (EEDI) a few years ago. One way of fulfilling the demanding requirements of the EEDI regulation is to reduce speed of future ships. This may result, however, in under-powered designs, raising questions regarding the ability of these designs to operate safely in adverse weather conditions. The present paper focuses on the development of an optimisation procedure for the design of tankers and bulk carriers, to identify designs with adequate powering to ensure safe operation in adverse weather conditions, while keeping the right balance between economy, efficiency and safety of the ship and the environment.
Methods of Calculating Ship Resistance on Limited Waterways
Polish Maritime Research, 2015
Nowadays predicting transportation costs is more and more important. Most significant part of inland navigation's costs are the costs of fuel. Fuel consumption is related to operating conditions of ship's propulsion system and its resistance. On inland waterways the ship resistance is strictly related to the depth of the waterway. There is a tendency to build a formula that allows its user to calculate the resistance of any inland waterway vessel, but researches claim that most of them are accurate only for particular types of ships and/or operating conditions. The paper presents selected methods of calculating ship resistance on inland waterways. These methods are examined for different types of ships and different conditions using results of model tests. The performed comparison enabled selecting the best option for pushboats and pushed barge trains, but also showed that any of the tested methods is good enough to be used for calculating the resistance of motor cargo vesse...
Sustainability
Enhancing environmental sustainability in maritime shipping has emerged as an important topic for both firms in shipping-related industries and policy makers. Speed optimization has been proven to be one of the most effective operational measures to achieve this goal, as fuel consumption and greenhouse gas (GHG) emissions of a ship are very sensitive to its sailing speed. Existing research on ship speed optimization does not differentiate speed through water (STW) from speed over ground (SOG) when formulating the fuel consumption function and the sailing time function. Aiming to fill this research gap, we propose a speed optimization model for a fixed ship route to minimize the total fuel consumption over the whole voyage, in which the influence of ocean currents is taken into account. As the difference between STW and SOG is mainly due to ocean currents, the proposed model is capable of distinguishing STW from SOG. Thus, in the proposed model, the ship’s fuel consumption and sailin...
Ship Design Optimization Applied for Urban Regular Transport on Guadalquivir River (GuadaMAR)
GuadaMAR project, financed by European Regional Development Fund (ERDF) and by the Government of Andalusia (Spain), involves work on various objectives that are essentially aimed at the theoretical design of a Prototype vessel and maritime navigation system for the Guadalquivir River. Based in the port of Seville, this would serve as a transport system for passengers, under criteria of efficiency, technical operability, and economic and environmental sustainability. The aim of our paper, presented in this 11th International Conference “Transnav 2015” on marine navigation and safety of sea transportation in Gdynia, is to show a resume of the technical requirements of the ship, hull design and hydrodynamic behaviour prediction in terms of wave pattern and resistance, propulsion systems selection and dimension for both high speed version for the inter-urban line, using compressed natural gas and diesel as fuel, and slow speed version for the urban line using electric propulsion and the newest ion-lithium batteries technology and solar power supply. These technologies together, offer a sustainable navigation, without pollution during operation time in the use area of the electric ship. A review of the structure design, the analysis of safety equipment required and the study of the stability and equilibrium required by Spanish National Administration, are also presented.
Evaluating an Inland Waterway Cargo Vessel’s Energy Efficiency Indices
Polish Maritime Research
Although the International Maritime Organization (IMO) introduced the energy efficiency requirements for ships more than a decade ago, to date, inland navigation has not been affected by corresponding regulations at all. Therefore, inland waterway vessels are left with no mandatory requirements that could push their technology into more energy efficient design. Fortunately, there are certain pioneering attempts to define energy efficiency criteria for inland vessels. This paper tries to gather and provide a review of such methods. Moreover, a typical Danube cargo inland vessel’s data are used to evaluate their current energy efficiency levels with respect to provisional criteria. Consequently, two methods are found and used here. They are both based on IMO’s energy efficiency concept but modified for the inland waterway vessels. The methods delivered a significant difference in applicability and were difficult to compare. Moreover, shallow and deep-water effects are explored in the ...
Polish Maritime Research
The purpose and scope of this article is to present the best marine practices used to determine the ship’s domain depth (compared to the safety depth parameter in ECDIS) and the safest and best possible speed (also known as optimal speed) of the ship in restricted sea areas limited by the depth of navigation waters. The author also presents a method that can be used to estimate the safe speed of a ship in shallow waters and the so-called navigational risk factor (specified in the range from 0 to 1), using the safety depth parameter specified in ECDIS based on the analysis of a three-dimensional model of the ship’s domain. The essence of the method proposed in this paper is a systematic approach to the operation of a seagoing ship in the aspect of assessing its navigation safety (navigational risk factor) when manoeuvring in restricted sea areas, in particular in shallow waters including navigable canals and fairways.
Voyage Optimisation towards Energy Efficient Ship Operations
2016
With the growth of shipping industry, voyage optimisation attracts attention as a way of improving energy efficiency of ship operations. It is not only related to the commercial benefit for a single shipment, but also affects ship design and shipping schedule etc. In this paper, a relatively advanced voyage optimisation model towards energy efficient shipping is introduced, which has comprehensive function modules, including grids system design and weather routing etc while taking into account the alternative energy saving devices. Through voyage optimisation, this model can provide the stakeholders a platform to develop more economical and reliable shipping route between different ports under various sea states. A case study using a bulk carrier as ship model is taken at last to prove the tool’s validity.
Design of a river-sea ship by optimization
Structural and Multidisciplinary Optimization, 2001
This paper deals with the shape optimization problem of an innovative RSS (River-Sea Ship) designed in such a way to achieve an improved dynamic behaviour in both river and sea navigation conditions. The solution of this problem can effectively allow an efficient exploitation of the potential capability of inland waterways in freight transport. For simulation purposes a three degrees of freedom dynamic model of the ship is used together with a nonlinear rigid-body model in order to exploit the aero-hydrodynamic slender body theory to derive forces and moments acting on the ship. An SQP (Sequential Quadratic Programming) method is then used to solve the related nonlinear optimization problem by means of BFGS (Broyden-Fletcher-Goldfarb-Shanno) alghorithm.