Rok 2021

• INFLUENCE OF THE HULL SHAPE ON THE ENERGY DEMAND OF A SMALL INLAND VESSEL WITH HYBRID PROPULSION

  Publikacja

  • A. Karczewski
  • M. Kunicka

  - Polish Maritime Research - Rok 2021

  Recently, there has been a significant development of ecological propulsion systems, which is in line with the general trend of environmentally friendly “green shipping”. The main aim is to build a safe, low-energy passenger ship with a highly efficient, emission-free propulsion system. This can be achieved in a variety of ways. The article presents the main problems encountered by designers and constructors already at the stage...

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• INVESTIGATIONS OF THE EMISSION CHARACTERISTICS OF A DUAL-FUEL GAS TURBINE COMBUSTION CHAMBER OPERATING SIMULTANEOUSLY ON LIQUID AND GASEOUS FUELS

  Publikacja

  • S. Serbin
  • B. Diasamidze
  • V. Gorbov
  • J. Kowalski

  - Polish Maritime Research - Rok 2021

  T his study is dedicated to investigations of the working process in a dual-fuel low-emission combustion chamber for a floating vessel’s gas turbine. As the object of the research, a low-emission gas turbine combustion chamber with partial premixing of fuel and air inside the outer and inner radial-axial swirls was chosen. The method of the research is based on the numerical solution of the system of differential...

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• Joints Of Steel Sandwich Structures

  Publikacja

  • J. Kozak

  - Polish Maritime Research - Rok 2021

  Steel sandwich structures are perceived as alternatives to single-skin welded structures in the shipbuilding industry due its advantages like significant reduction of mass in relation to typical single skin structure. However, beside problems with their strength properties itself, applications in real structures requires of solving the problem of joining, both for connection sandwich to sandwich as well as sandwiches to single-shell...

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• Minimizing Greenhouse Gas Emissions From Ships Using a Pareto Multi-Objective Optimization Approach

  Publikacja

  • Z. Domachowski

  - Polish Maritime Research - Rok 2021

  To confront climate change, decarbonization strategies must change the global economy. According to statements made as part of the European Green Deal, maritime transport should also become drastically less polluting. As a result, the price of transport must reflect the impact it has on the environment and on health. In such a framework, the purpose of this paper is to suggest a novel method for minimizing emissions...

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• NEW DESIGNS OF MAGNETIC FLUID SEALS FOR RECIPROCATING MOTION

  Publikacja

  • L. Matuszewski
  • P. Bela

  - Polish Maritime Research - Rok 2021

  T he operating conditions of magnetic fluid seals during reciprocating motion are so different from those observed in rotating motion that the use of their conventional structures for reciprocating motion seals yields no good results. The analysis of the sealing mechanism of magnetic fluid seals in reciprocating motion shows that the operation of these seals is affected by the carry-over phenomenon and magnetic fluid...

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• Numerical Estimation of Hull Hydrodynamic Derivatives in Ship Maneuvering Prediction

  Publikacja

  • R. Kołodziej
  • P. Hoffmann

  - Polish Maritime Research - Rok 2021

  Prediction of the maneuvering characteristics of the ship at the design stage can be done by means of model tests, computational simulations or a combination of both. The model tests can be realized as direct simulation of the standard maneuvers with the free running model, which gives the most accurate results, but is also the least affordable as it requires very large tank or natural lake, as well as complex equipment of the...

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• PARAMETRIC ANALYSIS OF THE EFFICIENCY OF THE COMBINED GAS-STEAM TURBINE UNIT OF A HYBRID CYCLE FOR THE FPSO VESSEL

  Publikacja

  • S. Serbin
  • N. Washchilenko
  • M. Dzida
  • J. Kowalski

  - Polish Maritime Research - Rok 2021

  A thermal diagram of the combined gas‒steam turbine unit of a hybrid cycle, which is an energy complex consisting of a base gas turbine engine with a steam turbine heat recovery circuit and a steam-injected gas turbine operating with overexpansion, is proposed. A mathematical model of a power plant has been developed, taking into consideration the features of thermodynamic processes of simple, binary, and steam-injected...

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• Performance and Emission Modelling and Simulation of Marine Diesel Engines using Publicly Available Engine Data

  Publikacja

  • M. H. Ghaemi (dawniej: M. Ghaemi)

  - Polish Maritime Research - Rok 2021

  To analyse the behaviour of marine diesel engines in unsteady states for different purposes, for example to determine the fuel consumption or emissions level, to adjust the control strategy, to manage the maintenance, etc., a goal-based mathematical model that can be easily implemented for simulation is necessary. Such a model usually requires a wide range of operating data, measured on a test stand. This is a time-consuming process...

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• PREDICTION OF SHIP MOTIONS IN IRREGULAR WAVES BASED ON RESPONSE AMPLITUDE OPERATORS EVALUATED EXPERIMENTALLY IN NOISE WAVES

  Publikacja

  • S. Bielicki

  - Polish Maritime Research - Rok 2021

  The most common methods for predicting ship roll motions in a specified sea state are direct measurements of motions in a representative irregular wave realisation (time domain) or calculations of motions from response amplitude operators (RAOs) in the frequency domain. The result of the first method is valid only for the tested sea state, whilst the second method is more flexible but less accurate. RAO-based predictions are calculated...

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• SPECTRAL RESPONSE OF STATIONARY JACK-UP PLATFORMS LOADED BY SEA WAVES AND WIND USING PERTURBATION METHOD

  Publikacja

  • B. Rozmarynowski
  • W. Jesien

  - Polish Maritime Research - Rok 2021

  The paper addresses non-linear vibrations of offshore jack-up drilling platforms loaded by sea waves and wind in their stationary condition using the perturbation method. Non-linearity of dynamic equations of motion for fixed offshore platforms yields from two factors. The first is load excitation generating non-linear velocity coupling in a dynamic system. This coupling is inherent in the modified Morison equation, involving the...

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• STUDY OF ARRAY OF MEMS INERTIAL MEASUREMENT UNITS UNDER QUASI-STATIONARY AND DYNAMIC CONDITIONS

  Publikacja

  • J. Demkowicz
  • K. Bikonis

  - Polish Maritime Research - Rok 2021

  A measurement system includes all components in a chain of hardware and software that leads from a measured variable to processed data. In that context, the type and quality of the sensors or measuring devices are critical to any measurement system. MEMS/IMU sensors lag behind leading technologies in this respect, but the MEMS/IMU performance rapidly changes while is relatively inexpensive. For this reason, the paper proposes...

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• TEST METHOD FOR DETERMINING THE CHEMICAL EMISSIONS OF A MARINE DIESEL ENGINE EXHAUST IN OPERATION

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2021

  The article briefly describes the problem of air pollution caused by sea-going ships and the resulting restrictions on the emission of toxic and harmful chemical compounds in the exhaust of marine engines, introduced by the International Maritime Organization (IMO) under the International Convention for the Prevention of Sea Pollution from Ships (MARPOL 73/78). Such emissions provide a significant metrological problem, not only...

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• The influence of selected strain-based failure criteria on ship structure damage resulting from a collision with an offshore wind turbine monopile

  Publikacja

  • K. Niklas
  • A. Bera

  - Polish Maritime Research - Rok 2021

  Offshore wind farms are developing well all over the world, providing green energy from renewable sources. The evaluation of possible consequences of a collision involves Finite Element computer simulations. The goal of this paper was to analyse the influence of selected strain-based failure criteria on ship damage resulting from a collision with an offshore wind turbine monopile. The case of a collision between an offshore supply...

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• The Matter of Decision-Making Control Over Operation Processes of Marine Power Plant Systems with the Use of their Models in the form of Semi-Markov Decision-Making Processes

  Publikacja

  • J. Girtler
  • J. Rudnicki

  - Polish Maritime Research - Rok 2021

  The article presents the possibility to control the real operation process of an arbitrary device installed in the marine power plant based on the four-state semi-Markov process, being the model of the process, which describes the transition process of operational states of the device and the transition process of its technical states. All these states are precisely defined for the ship main engine (SG). A hypothesis is proposed...

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• Ultimate compressive strength assessment of uncleaned and cleaned corroded plates with locked crack

  Publikacja

  • K. Wołoszyk
  • Y. Garbatov

  - Polish Maritime Research - Rok 2021

  The work presented here investigates the structural response of cleaned corroded plates, subjected to compressive load in the presence of a locked crack, where the change of mechanical properties as a result of corrosion development and the cleaning process is also accounted for. A Finite Element model for assessing the compressive strength, considering geometric and material nonlinearities, is developed, and the analysed plates...

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Rok 2020

• A study on fibre-reinforced concrete elements properties based on the case of habitat modules in the underwater sills

  Publikacja

  • M. Kurpińska
  • B. Grzyl
  • A. Kristowski

  - Polish Maritime Research - Rok 2020

  Hydrotechnical constructions are mostly objects functioning in extreme conditions and requiring a custom-made construction project. In the case of using prefabricated elements, it is required to develop production, transport, assembly, conservation and repair technology. Concerning the problem of concrete cracks, modern repair systems allow positive effects to be achieved in many cases of concrete elements repair. In this work...

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• Analysis of ultimate compressive strength of cracked plates with the use of DOE techniques

  Publikacja

  • K. Wołoszyk
  • Y. Garbatov

  - Polish Maritime Research - Rok 2020

  The objective of this work is to investigate the structural compressive response of plates with locked cracks accounting for all relevant factors and correlation between them. The nonlinear FE model considering both geometric and material nonlinearities is employed herein, and the FE model of the structural response of intact plates is validated with the available experimental data. In the common studies, based on One Factor at...

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• APPLICATION OF APRIORI ALGORITHM IN THE LAMINATION PROCESS IN YACHT PRODUCTION

  Publikacja

  • T. Niksa-Rynkiewicz
  • M. Landowski
  • P. Szalewski

  - Polish Maritime Research - Rok 2020

  The article specifies the dependence of defects occurring in the lamination process in the production of yachts. Despite great knowledge about their genesis, they cannot be completely eliminated. Authentic data obtained through cooperation with one of the Polish yacht shipyards during the years 2013–2017 were used for the analysis. To perform a simulation, the sample size was observed in 1450 samples, consisting of 6 models of...

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• Application of Shape Memory Alloys in Pipeline Couplings for Shipbuilding

  Publikacja

  • L. Matuszewski

  - Polish Maritime Research - Rok 2020

  The aim of the study is to analyse shape memory alloy (SMA) pipeline joints in limited space applications for all kinds of ships. Generally, the space available in various areas on ships is strictly limited and service works usually meet many obstacles. If we consider a pipeline, the flange joints always require a larger free space around the pipe than the pipe alone. A simultaneous problem can occur with the propeller shaft line...

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• Application of Stirling Engine Type Alpha Powered by the Recovery Energy on Vessels

  Publikacja

  • J. Kropiwnicki

  - Polish Maritime Research - Rok 2020

  The Stirling engine is a device, in which thermal energy is transformed into mechanical without a contact between the heat carrier, and the working gas closed in the engine. Mentioned feature makes this type of engine very attractive for the use of the recovery energy, taken from other heat devices. One of the potential applications of Stirling engines is the use of thermal energy generated in the ship's engine room for producing...

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• Application of the Chimney Cap as a Method of Improving the Effectiveness of Natural Ventilation in Buildings

  Publikacja

  • R. Antczak-Jarząbska
  • M. Niedostatkiewicz

  - Polish Maritime Research - Rok 2020

  Adequately designed natural ventilation is the cheapest and easiest way to effectively remove indoor pollutants and keep the air inside a building fresh. A prediction of the performance and effectiveness of ventilation in order to determine the design of a ventilation system can provide real and long-term cost savings. The worst time in terms of the efficiency of natural ventilation is the spring-autumn transition period [7]. In...

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• Cargo ships heat demand - operational experiment

  Publikacja

  • D. Bocheński
  • D. Kreft

  - Polish Maritime Research - Rok 2020

  The paper presents the results of an experiment conducted on two cargo ships – a 5300 TEU container with a steam heating system and a 7500 dwt general cargo ship with a thermal oil system. On both ships research has been carried out using specially designed measuring equipment. After gathering data about flow velocity and temperatures (steam/ cooling water/ thermal oil/ seawater/ outside air), calculations have been done, resulting...

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• DESIGN ANALYSIS OF HYBRID GAS TURBINE - FUEL CELL POWER PLANT IN STATIONARY AND MARINE APPLICATIONS

  Publikacja

  • T. Kwaśniewski
  • M. Piwowarski

  - Polish Maritime Research - Rok 2020

  The paper concerns design analysis of a hybrid gas turbine power plant with a fuel cell (stack). The aim of this work was to find the most favorable variant of the medium capacity (approximately 50 MW) hybrid system. In the article, computational analysis of two variants of such a system was carried out. The analysis let to calculate capacity, efficiency of both variants and other parameters like flu gas temperature. The paper...

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• DETERMINATION OF ADDITIONAL TENSION IN TOWED STREAMER CABLE TRIGGERED BY COLLISION WITH UNDERWATER MOVING OBJECT

  Publikacja

  • V. Blintsov
  • K. Trunin
  • W. Tarełko

  - Polish Maritime Research - Rok 2020

  The paper deals with issues connected with the behaviour of a streamer cable towed by a survey seismic vessel when the cable undergoes a strike triggered by collision with an underwater moving object. The consequences of such collisions may be both threat to the life of marine animals or damage to underwater units and large economic losses suffered by vessel owners. The risk of such collisions has increased over the last years...

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• DETERMINATION OF SEAKEEPING PERFORMANCE FOR A CASE STUDY VESSEL BY THE STRIP THEORY METHOD

  Publikacja

  • K. Niklas
  • A. Karczewski

  - Polish Maritime Research - Rok 2020

  The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the...

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• ENERGY ANALYSIS OF THE PROPULSION SHAFT FATIGUE PROCESS IN A ROTATING MECHANICAL SYSTEM PART II IDENTIFICATION STUDIES – DEVELOPING THE FATIGUE DURABILITY MODEL OF A DRIVE SHAFT

  Publikacja

  • Z. Korczewski
  • K. M. Marszałkowski (dawniej: K. Marszałkowski)

  - Polish Maritime Research - Rok 2020

  The article presents a continuation of research carried out concerning identification of energy consequences of mechanical fatigue within a propeller shaft in a rotating mechanical system, while working under conditions of the loss of the required alignment of shaft lines. Experimental research was carried out on a physical model reflecting a full-sized real object: i.e., the propulsion system of the ship. It is proven, by means...

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• EVOLUTIONARY MULTI–OBJECTIVE WEATHER ROUTING OF SAILBOATS

  Publikacja

  • E. Sobecka
  • R. Szłapczyński
  • M. Życzkowski

  - Polish Maritime Research - Rok 2020

  The paper presents a multi-objective method, which optimises the route of a sailboat. The presented method makes use of an evolutionary multi-objective (EMO) algorithm, which performs the optimisation according to three objective functions: total passage time, a sum of all course alterations made during the voyage and the average angle of heel. The last two of the objective functions reflect the navigator’s and passenger’s comfort,...

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• Experimental and numerical investigations of ultimate strength of imperfect stiffened plates of different slenderness

  Publikacja

  • K. Wołoszyk
  • Y. Garbatov
  • J. Kowalski
  • L. Samson

  - Polish Maritime Research - Rok 2020

  The objective of this study is to analyse the behaviour of compressed stiffened plates of different slenderness using experimental and numerical methods. The presented results are part of a long-term project to investigate the ultimate strength of geometrically imperfect structures subjected to different degradation phenomena, including corrosion degradation and locked cracks. Several specimens were subjected to a uniaxial compressive...

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• Experimental Research on Insufficient Water Lubrication of Marine Stern Tube Journal Bearing with Elastic Polymer Bush

  Publikacja

  • A. Barszczewska

  - Polish Maritime Research - Rok 2020

  Water-lubricated bearings with polymer bushes are steadily gaining popularity due to their advantages, including environmental friendliness, relatively simple construction and long-term operation. Nevertheless, in practice instances of damage to such bearings occur due to insufficient or absent flow of the lubricating agent. In this study, experimental tests established that elastic polymer bush bearing is capable of operating...

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• Hydrodynamic Model of the New Waterway through the Vistula Spit

  Publikacja

  • M. Szydłowski
  • T. Kolerski

  - Polish Maritime Research - Rok 2020

  The decision to build a new waterway (strait) in the Polish part of the Vistula Spit was made in 2017. The new connection between the Gulf of Gdańsk and the Vistula Lagoon is planned as an artificial navigable channel with a lock and a small port. During storm surges and wind tides in the gulf or in the lagoon, sluicing will be re-quired for vessels to tackle the Vistula Spit. This procedure does not require significant water flow...

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• Influence of process of straightening ship hull structure made of 316L stainless steel on corrosion resistance and mechanical properties

  Publikacja

  • J. Kowalski
  • Ł. Licznerski
  • M. Supernak (dawniej: M. Supernak-Marczewska)
  • K. Emilianowicz

  - Polish Maritime Research - Rok 2020

  The AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries, for architectural elements, and many others. The chemical composition of corrosion-resistant...

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• Investigations of the Working Process in a Dual-Fuel Low-Emission Combustion Chamber for an FPSO Gas Turbine Engine

  Publikacja

  • S. Serbin
  • B. Diasamidze
  • M. Dzida

  - Polish Maritime Research - Rok 2020

  This investigation is devoted to an analysis of the working process in a dual-fuel low-emission combustion chamber for a floating vessel’s gas turbine. The low-emission gas turbine combustion chamber with partial pre-mixing of fuel and air inside the outer and inner radial-axial swirlers was chosen as the object of research. When modelling processes in a dual-flow low-emission gas turbine combustion chamber, a generalized method...

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• Limiting distribution of the three-state semi-Markov model of technical state transitions of ship power plant machines and its applicability in operational decision-making.

  Publikacja

  • J. Girtler

  - Polish Maritime Research - Rok 2020

  The article presents the three-state semi-Markov model of the process {W(t): t 0} of state transitions of a ship power plant machine, with the following interpretation of these states: s1 – state of full serviceability, s2 – state of partial serviceability, and s3 – state of unserviceability. These states are precisely defined for the ship main engine (ME). A hypothesis is proposed which explains the possibility of application...

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• LNG TANK IN ŚWINOUJŚCIE: NONLINEAR ANALYSIS OF THE TANK DOME ELEMENTS BEHAVIOUR

  Publikacja

  • B. Sobczyk

  - Polish Maritime Research - Rok 2020

  In this paper, the dome of a tank in the Świnoujście LNG terminal is analysed. Some of the rafter ribs at the connection with hangers were not mounted during construction of the tank dome. Therefore, it has become necessary to estimate its response, which has been done with the aid of some computational models of the dome, that have been created in the finite element method environment. Different local models are studied, aiming...

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• MULTI-CRITERIA COMPARATIVE ANALYSIS OF THE USE OF SUBTRACTIVE AND ADDITIVE TECHNOLOGIES IN THE MANUFACTURING OF OFFSHORE MACHINERY COMPONENTS

  Publikacja

  • M. Deja
  • M. Siemiątkowski
  • D. Zieliński

  - Polish Maritime Research - Rok 2020

  The dynamic development of additive manufacturing technologies, especially over the last few years, has increased the range of possible industrial applications of 3D printed elements. This is a consequence of the distinct advantages of additive techniques, which include the possibility of improving the mechanical strength of products and shortening lead times. Offshore industry is one of these promising areas for the application...

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• OPTIMISING RIG DESIGN FOR SAILING YACHTS WITH EVOLUTIONARY MULTIOBJECTIVE ALGORITHM

  Publikacja

  • M. Pawłusik
  • R. Szłapczyński
  • A. Karczewski

  - Polish Maritime Research - Rok 2020

  The paper presents a framework for optimising a sailing yacht rig using Multi-objective Evolutionary Algorithms and for filtering obtained solutions by means of a Multi-criteria Decision Making method. A Bermuda sloop with discontinuous rig is taken under consideration as a model rig configuration. It has been decomposed into its elements and described by a set of control parameters to form a responsive model which can be used...

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• Parametric method applicable in assessing breakout force and time for lifting slender bodies from seabed

  Publikacja

  • J. Michalski

  - Polish Maritime Research - Rok 2020

  The article presents a parametric method applicable in assessing the suction force of a slender body to the seabed, and prognosing the body extrication time. Along with the body weight in water, the information on the suction force is essential for assessing the force needed to lift the object from the seabed. Based on the Foda theory and the resulting integral equation, which relates the maximum suction force with basic parameters...

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• Potential and Use of the Googlenet Ann for the Purposes of Inland Water Ships Classification

  Publikacja

  • K. Bobkowska
  • I. Bodus-olkowska Izabela

  - Polish Maritime Research - Rok 2020

  This article presents an analysis of the possibilities of using the pre-degraded GoogLeNet artificial neural network to classify inland vessels. Inland water authorities monitor the intensity of the vessels via CCTV. Such classification seems to be an improvement in their statutory tasks. The automatic classification of the inland vessels from video recording is a one of the main objectives of the Automatic Ship Recognition and...

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• SAILING ROUTE PLANNING METHOD CONSIDERING VARIOUS USER CATEGORIES

  Publikacja

  • M. Życzkowski

  - Polish Maritime Research - Rok 2020

  The article describes the methodology related to determining the multi-criteria routes for sailing ships. Details of sea area discretisation and discretisation of the description of the sailing vessel properties and manoeuvring principles are shown. User requirements were specified (for five different categories of users) and on this basis the criteria for selecting the most suitable shipping route were formulated. The presented...

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• SHORT REVIEW AND 3-D FEM ANALYSIS OF BASIC TYPES OF FOUNDATION FOR OFFSHORE WIND TURBINES

  Publikacja

  • P. Iwicki
  • J. Przewłócki

  - Polish Maritime Research - Rok 2020

  Some problems of the foundations of offshore wind turbines are considered in this paper. A short review is presented on the two basic types of foundations, i.e. monopiles and gravity foundations, including their basic features and applications as well as general design considerations. Also, some issues regarding analysis are discussed, including geotechnical problems and modelling techniques. A numerical model of offshores turbine...

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• The Influence of the Cuboid Float’s Parameters on the Stability of a Floating Building

  Publikacja

  • A. Karczewski
  • Ł. Piątek

  - Polish Maritime Research - Rok 2020

  Usually, the concept of sufficient stability of a floating structure is connected with the capacity to keep a small heel angle despite the moment of heeling. The variable responsible for these characteristics is the initial metacentric height, which is the relation between the hydrostatic features of the pontoon and the mass properties of the entire object. This article answers the questions of how heavy the floating system should...

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• The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

  Publikacja

  • P. Śliwiński

  - Polish Maritime Research - Rok 2020

  In this paper, mechanical losses in a hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were onducted using a special design (prototype) of a hydraulic satellite motor. The design of the satellite motor is presented. This motor was developed to supply both with water and mineral oil and features...

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• Towards Improving Optimised Ship Weather Routing

  Publikacja

  • R. Vettor
  • J. Szłapczyńska
  • R. Szłapczyński
  • W. Tycholiz
  • C. G. Soares

  - Polish Maritime Research - Rok 2020

  The aim of the paper is to outline a project focusing 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...

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• Underwater Navigation Ssystem Based on Doppler Shift – Measurements and Error Estimations

  Publikacja

  • Z. Ostrowski
  • R. Salamon
  • I. Kochańska
  • J. Marszal

  - Polish Maritime Research - Rok 2020

  A new acoustic navigation system was developed to determine the position and speed of moving underwater objects such as divers and underwater vehicles. The path of an object and its speed were determined by the Doppler shifts of acoustic signals emitted by a transmitter placed on the object and received by four hydrophones installed at the periphery of the monitored body of water. The position and speed measurements were affected...

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• Validation Process for Computational Model of Full-Scale Segment for Design of Composite Footbridge

  Publikacja

  • T. Ferenc
  • T. Mikulski

  - Polish Maritime Research - Rok 2020

  Experimental tests and numerical simulations of a full-scale segment of a foot and cycle bridge made of polymer composites are presented in the paper. The analysed structure is made of sandwich panels, which consist of glass fibre reinforced polymer (GFRP) multi-layered laminate faces and a PET foam (obtained from recycling) core. The dimensions of the segment cross-section are the same as for the target footbridge; however, span...

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Rok 2019

• A CONCEPT DESIGN OF DIESEL – HYDRAULIC PROPULSION SYSTEM FOR PASSENGER SHIP INTENDED FOR INLAND SHALLOW WATER NAVIGATION

  Publikacja

  • C. Dymarski

  - Polish Maritime Research - Rok 2019

  This paper presents an analysis of environmental and technical conditions necessary for working out a possibly most favourable propulsion system for a two – segment passenger ship intended for navigation between Berlin and Kaliningrad. There are presented various types of propulsion systems for small ships as well as analyzed their possible applications and consequences. In this work there were taken into account system’s reliability,...

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• A method to determine the tightening sequence for standing rigging of a mast

  Publikacja

  • L. Samson
  • M. Kahsin

  - Polish Maritime Research - Rok 2019

  The article proposes an alternative method to determine the sequence of generation of pre-tension forces in standing rigging of a mast. The proposed approach has been verified on both a virtual simulation experiment and laboratory tests. In this method, the desired tension values are obtained using the influence matrix which allows to calculate the effect of tension change in an individual rope on the tension distribution in the...

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• ANALYSIS OF IMPACT of SHIP model parameters on changes of control quality index in ship dynamic positioning system

  Publikacja

  • T. Niksa-Rynkiewicz
  • A. Witkowska

  - Polish Maritime Research - Rok 2019

  In this work there is presented an analysis of impact of ship model parameters on changes of control quality index in a ship dynamic positioning system designed with the use of a backstepping adaptive controller. Assessment of the impact of ship model parameters was performed on the basis of Pareto-Lorentz curves and ABC method in order to determine sets of the parameters which have either crucial, moderate or low impact on objective...

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• ANALYSIS OF THE PROJECT OF INNOVATIVE FLOATING TURBINE

  Publikacja

  • A. Tomporowski
  • A. Al - Zubiedy
  • J. Flizikowski
  • W. Kruszelnicka
  • P. Bałdowska-Witos
  • J. Rudnicki

  - Polish Maritime Research - Rok 2019

  The design of a floating, innovative device for river water aeration and conversion of mechanical energy to electrical energy required the analysis of a number of geometrical and dynamic features. Such an analysis may be carried out on the basis of existing methods of numerical fluid mechanics. Models of pressures, forces and torques characteristic for the conversion of watercourse energy were developed for two basic concepts of...

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• APPLICABILITY OF INLET AIR FOGGING TO MARINE GAS TURBINE

  Publikacja

  • Z. Domachowski
  • M. Dzida

  - Polish Maritime Research - Rok 2019

  The dependency of marine gas turbine on the ambient temperature leads to a decrease of the gas turbine power output in arid areas. Very often gas turbine power output demand is high and the power margins originally designed into the driver , has been exhausted. In such circumstances the inlet air fogging is an effective compensation of gas turbine power. In this paper an analysis of inlet air fogging applicability to marine gas...

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