Title: Reduction of resistance, fuel consumption and GHG emission of a small fishing vessel by adding a bulbous bow

Author/Authors: Szelangiewicz T., Abramowski T., Żelazny K, Sugalski K.

Place of publication: MDPI

Year: 2021

Keywords: bulbous bow, calculation of fluid dynamics—CFD, fishing vessels in service, fuel consumption and exhaust gases content, reduction of the vessel’s resistance

Abstract: Protection of marine environment and reduction of GHG emissions are currently imperative criterion for ship design. For ships in service, including fishing vessels powered by internal combustion engines, options of retrofitting are sought to reduce their hydrodynamic resistance and fuel consumption. One such possibility is the addition of a simple-shape bulbous bow, which can be installed at low cost to upgrade a fishing vessel. We present an analysis of the effect that the bulbous bow has on fishing vessel resistance across the whole range of speeds at which the entire work cycle of the vessel is carried out. The resistance was calculated using a calculation of fluid dynamics (CFD) method for the actual size of the vessel. We show that it is possible to develop such a bulbous bow for which the resistance of fishing vessel with a bulbous bow is going to be lower than that of an unmodified shape. For the modified shape of the fishing vessel, fuel consumption, amount and composition of exhaust gases were calculated and the obtained results were compared with the parameters of the vessel without modification. The tests carried out and the obtained calculation results indicate that a significant reduction of fuel consumption and GHG emissions may be obtained for the existing old fishing vessels at low anticipated modernization costs.

Website address (link) to the full text of the publication: https://www.mdpi.com/1996-1073/14/7/1837

DOI: 10.3390/en14071837

Title: Application of Measurement Sensors and Navigation Devices in Experimental Research of the Computer System for the Control of an Unmanned Ship Model

Author/Authors: Szelangiewicz T., Żelazny K., Antosik A, Szelangiewicz M.

Place of publication: SENSORS

Year: 2021

Keywords: autonomous unmanned vessel (MASS), computer control system, measuring sensors and navigation devices, model tests of unmanned vessel in open water, recording of movement parameters and images from lidars and cameras

Abstract: Unmanned autonomous transport vessels (MASS) are the future of maritime transport. The most important task in the design and construction of unmanned ships is to develop algorithms and a computer program for autonomous control. In order for such a computer program to properly control the ship (realizing various functions), the ship must be equipped with a computer system as well as measurement sensors and navigation devices, from which the recorded parameters are processed and used for autonomous control of the ship. Within the framework of conducted research on autonomous ships, an experimental model of an unmanned ship was built. This model was equipped with a propulsion system not commonly used on transport vessels (two azimuth stern thrusters and two bow tunnel thrusters), but providing excellent propulsion and steering characteristics. A complete computer system with the necessary measuring sensors and navigation devices has also been installed in the model of the ship, which enables it to perform all functions during autonomous control. The objective of the current research was to design and build a prototype computer system with the necessary measurement sensors and navigation devices with which to autonomously control the unmanned ship model. The designed computer system is expected to be optimal for planned tasks during control software tests. Tests carried out on open waters confirmed the correctness of the operation of the computer system and the entire measurement and navigation equipment of the built model of the unmanned transport vessel.

Website address (link) to the full text of the publication: https://www.mdpi.com/1424-8220/21/4/1312

DOI: 10.3390/s21041312

Title: Unmanned ships – maritime transport of the 21st century

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Scientific Journals of the Maritime University of Szczecin

Year: 2020

Keywords: Unmanned, remotely operated and autonomously ships, levels of autonomy, emission- free propulsion technical, legal and administrative problems, construction and testing of an unmanned vessel

Abstract:

Website adUnmanned, remotely or autonomously ships are the fastest growing new technology in maritime transport in recent years. The design of unmanned vessels envisions clean, emission-free electric propulsion. The costs of building physical models and target vessels are high, but the expected benefits are generating increasing interest in such vessels. This article presents the current state of research in the field of unmanned ships and the technical, legal and administrative problems that need to be solved in order for these ships to be used by the general public.

Website address (link) to the full text of the publication: http://repository.scientific-journals.eu/handle/123456789/2651

DOI: 10.17402/449

Title: Hydrodynamic characteristics of the propulsion thrusters of an unmanned ship model

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Scientific Journals of the Maritime University of Szczecin

Year: 2019

Keywords: experimental model of an unmanned ship, propulsion system, hydrodynamic characteristics of propellers, azimuthal propeller, tunnel thruster, measurements of propeller characteristics

Abstract: In this paper, an experimental model has been developed to study an unmanned ship. Two aft azimuthal propellers and two bow tunnel thrusters were used to propel the ship. In order to develop algorithms and a computer program to control the model, it is necessary to determine the hydrodynamic characteristics of the propellers installed in the model. The propellers are very small; therefore it is impossible to use approximate methods of calculating the thrust of the ship’s propellers. The characteristics of the thrust of the propellers installed in the model were measured experimentally. This paper has given a description of the test stand and the results of the measurement of the thrust forces of the propellers installed in the model of an unmanned ship.

Website address (link) to the full text of the publication: http://repository.scientific-journals.eu/handle/123456789/2627

DOI: 10.17402/428

Title: An approximate method for calculating the resistance of a transport ship model

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Scientific Journals of the Maritime University of Szczecin

Year: 2019

Keywords: approximation of ship model resistance, autonomous ships, friction resistance, ship model, Total resistance, unmanned surface vessel (USV)

Abstract: The article presents regression formulas for calculating the friction resistance RF and the total resistance RT of ship models in the 2.0–10.0 m range. The method for calculating the total resistance is novel and applies to the design models of an unmanned surface vessel (USV) for experimental testing of autonomous control. For both regression models (RF and RT), statistical and substantive tests were performed (the results of the calculations were compared with the experimental measurements). In both cases, convincing results were obtained, which have confirmed the possibility of their use at the preliminary design stage of unmanned ship models.

Website address (link) to the full text of the publication: http://repository.am.szczecin.pl/handle/123456789/2581

DOI: 10.17402/373

Title: Computer simulator of a model ship’s unmanned movement

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Scientific Journals of the Maritime University of Szczecin

Year: 2019

Keywords: computer symulator, experimental model of an unmanned ship, mathematical model of the ship, propulsion system, ship’s manoeuvring equations, unmanned ship

Abstract: As part of this research, an experimental model of an unmanned ship equipped with an ecological electric drive was built. Ultimately, the ship model was equipped with an on-board computer with appropriate software for autonomous control. A computer simulator was used to test the control software. This article presents the concept of such a simulator, a general mathematical model of the movement dynamics of an unmanned vehicle, a description of the propulsion system, and the tasks planned for implementation in a computer simulator.

Website address (link) to the full text of the publication: http://repository.am.szczecin.pl/handle/123456789/2555

DOI: 10.17402/350

Title: Computer simulations of deformations and tensions in the pipelines of hydraulic lifting systems

Author/Authors: Szelangiewicz T. ,Żelazny K., Buczkowski R.

Place of publication: Scientific Journals of the Maritime University of Szczecin

Year: 2017

Keywords: collecting pipelines, deformations and tensions of lift pipeline, hydraulic lifting systems, mining, nodules,

Abstract: One of the methods of collecting polymetallic nodules from the sea floor is a hydraulic system using a single or double vertical pipeline. While mining, collecting pipelines suspended from a mining support vessel (MSV) move together. As a result of both the MSV’s motion with a suspended pipe system and water action (including deep-water currents) a vertical deflection and deformation occur along the pipeline. Simultaneously, stretching and bending tensions emerge along the pipeline. The article presents computer simulation results of vertical deflection and tensions within single and double vertical pipelines with fixed force from the ship’s movement (linear movement at constant speed) and regular force from the waves).

Website address (link) to the full text of the publication: http://repository.scientific-journals.eu/handle/123456789/2443

DOI: 10.17402/243

Title: PREDICTION POWER PROPULSION OF THE SHIP AT THE STAGE OF PRELIMINARY DESIGN Part II: MATHEMATICAL MODEL SHIP POWER PROPULSION FOR SERVICE SPEED USEFUL IN THE PRELIMINARY DESIGN

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Management Systems in Production Engineering

Year: 2017

Keywords: power propulsion, preliminary design, service speed

Abstract: During the design of the ship the most important decisions are made at the stage of preliminary design. One of the most important design parameters assumed by the shipowner is its service speed in real weather conditions occurring in the shipping line. For this speed, at the stage of preliminary design, when are known only to the basic geometric parameters of the ship should be determined motor power. In practice design, power propulsion is determined with a very approximate formulas but for the speed in calm water. Only after the project contract and the signing of the contract are carried out by means of resistance and self-propulsion of model test. The paper presents a mathematical model for determining the power propulsion for the assumed operating speed. This model is dependent only on the basic geometric parameters of the hull of the ship and the weather parameters occurring in liner shipping. Also shows the results of calculations according to this model, the power propulsion for one of vessels built.

Website address (link) to the full text of the publication: https://content.sciendo.com/view/journals/mspe/25/4/article-p231.xml?rskey=zmlXKx&result=2

DOI: 10.1515/mspe-2017-0032

Title: Prediction power propulsion on the ship at the stage of preliminary design. Part I: Forecasting method for power propulsion on the ship at the stage of preliminary design

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Management Systems in Production Engineering

Year: 2017

Keywords: power propulsion, preliminary design, service speed

Abstract: During the design of the ship the most important decisions are made at the stage of preliminary design. One of the most important design parameters assumed by the shipowner is its service speed in real weather conditions occurring in the shipping line. For this speed, at the stage of preliminary design, when are known only to the basic geometric parameters of the ship and its motor power should be determined. In practice, design, power propulsion is determined with a very approximate formulas but for the speed in calm water. Only after the project contract and the signing of the contract are carried out by means of resistance and self-propulsion of model test. The article presents the concept of the method for determining the power propulsion for the assumed service speed, which depends only on the basic geometric parameters of the ship’s hull.

Website address (link) to the full text of the publication: https://content.sciendo.com/view/journals/mspe/25/2/article-p125.xml?rskey=zmlXKx&result=1

DOI: 10.1515/mspe-2017-0019

Title: Numerical simulations of water flow around ocean mining piping

Author/Authors: Szelangiewicz T., Żelazny K.

Place of publication: Scientific Journals of the Maritime University of Szczecin

Year: 2017

Keywords: CFD simulations, hydrodynamic resistance forces, mining, nodules, vertical pipe, water flow

Abstract: Ocean mining systems that incorporate a single or double lift pipe are two methods used to obtain polimetallic nodules from the seabed. The pipe must be equipped with main cables and flexible pipe attached to the mining vehicle collecting nodules. While mining, the pipes in the vertical configuration are moving along with the ship above. They are subjected to currents in the water column. Such current-induced hydrodynamic drag results in a vertical deflection, which is dependent – among other factors such as varying current velocity at points along the length of the pipe. The present paper presents results of computer simulations using commercial CFD software to model the hydrodynamic forces acting on the vertical pipe of ocean mining systems. The results present the influence of the water flow direction in relation to the lift pipe on the hydrodynamic force and torsional moment acting upon the pipe.

Website address (link) to the full text of the publication: http://repository.am.szczecin.pl/handle/123456789/2411

DOI: 10.17402/237