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1
Content available Laboratory test rig for examining aggregate mining from seabed using the Airlift method
Dymarski C., Pająk T.
Polish Maritime Research
|
2018
|
S 1
145--150
EN
The use of the Airlift method for transporting the mined aggregate from the seabed to the deck of the mining ship is an alternative for presently used solutions, such as suction pumps or scoop transport for instance. Building the laboratory test rig was preceded by tests in natural conditions. The rig was designed in such a way as to model these conditions as close as possible, and to have potential for further development.
2
Content available Technology concept of TLP platform towing and installation in waters with depth of 60 m
Dymarski C., Dymarski P., Żywicki J.
Polish Maritime Research
|
2017
|
S 1
59--66
EN
The article is part of the design and research work conducted at the Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology, in cooperation with a number of other research centres, which concerns offshore wind farms planned to be built in the Polish zone of the Baltic sea in the next years. One of most difficult tasks in this project is building suitable foundations for each power unit consisting of a tower and a wind turbine mounted on its top. Since the water regions selected for building those wind farms have different depths, there was need to study different possible technical variants of this task, with the reference to both the foundation structures themselves, and the technology of their transport and setting, or anchoring. The article presents the technology of towing, from the shipyard to the setting place, and installation of the foundation having the form of a floating platform of TLP (Tension Leg Platform) type, anchored by tight chains to suction piles in the waters with depth of 60 m.
3
Content available Searching for critical conditions during lifeboat launching – simulations
Dymarski C., Dymarski P., Kniat A.
Polish Maritime Research
|
2017
|
S 1
53--58
EN
The article describes numerical simulations of the process of lifeboat launching at the ship’s side. The research aimed at finding the values of ship motion parameters which appear to be most dangerous for people in the lowered lifeboat due to the generated accelerations. The simplified model of ship hull motion adopted at this research stage bases on a superposition of harmonic motions with given amplitudes and periods in six degrees of freedom. The range of the amplitude of motion for each degree of freedom corresponds approximately to that of possible motion of the PANAMAX type ship on the Baltic sea. In total, 120 960 cases of ship hull motion were examined.
4
Content available Design of structure of tension leg platform for 6 MW offshore wind turbine based on FEM analysis
Żywicki J., Dymarski P., Ciba E., Dymarski C.
Polish Maritime Research
|
2017
|
S 1
230--241
EN
The article presents the calculation and design stages of the TLP platform serving as a supporting construction of a 6 MW offshore wind turbine. This platform is designed to anchor at sea at a depth of 60 m. The authors presented the method of parameterization and optimization of the hull geometry. For the two selected geometry variants, the load and motion calculations of the platform subjected to wind, wave and current under 50-year storm conditions were performed. The maximum load on the structure was determined in these extreme storm conditions. For these loads, the MES calculation of the designed platform was performed for the selected variant. Authors have presented a method for calculating maximum wind, wave and current stresses on the structure during the worst storm in the past 50 years. For these loads the MES endurance calculations of the designed platform were made. Based on the results of these calculations, the required structural changes and recalculations have been made in succession to the structural design of the platform, which meets the design requirements and has the required ad hoc strength. The article contains stress analysis in „difficult” nodes of constructions and discusses ways of solving their problems. The work is part of the WIND-TU-PLA project from the NCBR Research Agreement (Agreement No. MARTECII / 1/2014).
5
Content available remote Developing methodology for model tests of floating platforms in low-depth towing tank
Dymarski C., Dymarski P.
Archives of Civil and Mechanical Engineering
|
2016
|
Vol. 16, no. 1
159--167
EN
The paper presents two different methods of physical modeling of semi-submersible platform mooring system for research in low depth towing tank. The tested model was made in the scale of 1:100 resembling the “Thunder Horse” platform moored in the Gulf of Mexico at a depth of 1920 m. Its mooring system consisted of 16 semi-taut mooring lines (chain-wire-chain) spaced star-shape and attached at the bottom to suction piles. The tests were performed in the towing tank of the Gdansk University of Technology (GUT). The tank depth is 1.5 m and which is about 13.5 times less than that required for typical model tests. This required the development and use of non-standard methods of mooring for the model, which was adapted to the technical conditions existing in the laboratory and material possibilities. Numerical calculations and characteristics of static displacement of the model as a function of the external horizontal load were carried out for both anchoring systems. These characteristics were scaled to the natural conditions and compared with the calculated characteristics of the reference platform. The second method of modeling proved to be much more accurate.
6
Content available Design and strength calculations of the tripod support structure for offshore power plant
Dymarski C., Dymarski P., Żywicki J.
Polish Maritime Research
|
2015
|
nr 1
36--46
EN
The support structure being the object of the analysis presented in the article is Tripod. According to the adopted assumptions, it is a foundation gravitationally set in the water region of 60 m in depth, not fixed to the seabed, which can be used for installing a 7MW wind turbine. Due to the lack of substantial information on designing and strength calculations of such types of structures in the world literature, authors have made an attempt to solve this problem within the framework of the abovementioned project. In the performed calculations all basic loads acting on the structure were taken into account, including: the self mass of the structure, the masses of the ballast, the tower and the turbine, as well as hydrostatic forces, and aero- and hydrodynamic forces acting on the entire object in extreme operating conditions.
7
Content available remote Żuraw pokładowy z kompensacją nurzania
Dymarski C.
Napędy i Sterowanie
|
2015
|
R. 17, nr 4
112--116
PL
W referacie przedstawiono rozwiązanie konstrukcyjne oraz schemat napędu i sterowania hydraulicznego żurawia pokładowego możliwych do wykorzystania np. przy przeładunku na morzu towarów jednostkowych, w tym także niebezpiecznych. Wymienione uwarunkowania i dodatkowe wymagania dotyczące warunków pracy oraz parametrów geometrycznych, w tym bardzo ograniczonej wysokości żurawia, miały decydujący wpływ na jego konstrukcję i kinematykę, a także na zastosowany układ napędu i sterowania. Bardzo istotną funkcją tego układu jest stabilizowanie ruchów ładunku i tym samym ograniczenie działających na niego dynamicznych obciążeń podczas pracy żurawia na wzburzonym morzu.
EN
This paper presents the design solution and schema of hydraulic drive and control systems of the deck crane destined for transshipment at sea of unit loads including also dangerous loads. These conditions and additional requirements regarding working conditions and geometrical parameters, including a very limited height of the crane had a decisive influence on the structure and kinematics, as well as the applied drive and control system. A very important feature of this system is stabilisation of the load movement, thus reducing the dynamic loads during operation of the crane on a stormy sea.
8
Content available Computational simulation of motion of a rescue module during its launching from ship at rough sea
Dymarski C., Dymarski P.
Polish Maritime Research
|
2014
|
nr 3
54--60
EN
This paper is a continuation of the work titled : “A computational model for simulation of motion of rescue module during its launching from stern ramp of a ship at rough sea”. It presents results of computer simulations of motion of a rescue module with embarked persons during its launching on rollers along stern ramp of a ship at rough sea. The simulations were conducted for a selected ship fitted with a launching ramp , for a few selected scenarios of sea conditions. It was assumed that during this operation the ship drifts across direction of wave propagation.
9
Content available A numerical model to simulate the motion of a lifesaving module during its launching from the ship’s stern ramp
Dymarski P., Dymarski C.
Polish Maritime Research
|
2014
|
nr 2
34--40
EN
The article presents a numerical model of object motion in six degrees of freedom (DoF) which is intended to be used to simulate 3D motion of a lifesaving module during its launching from a ship using a stern ramp in rough sea. The model, of relatively high complexity, takes into account both the motion of the ship on water in changing sea conditions, and the relative motion of the ramp with respect to the ship. The motion of the ramp changes and strongly depends on its constructional and geometrical parameters. The presented model takes into account the displacement of the submerged part of the ramp, as well as its damping in the water and the interaction with the module moving on it. The results of test simulation of a module launching from the ship in still water are included.
10
Content available Assessment of underpowered propulsion machinery in electrically driven small inland waterway passenger ships from classification society point of view
Dymarski C., Narewski M.
Journal of Polish CIMAC
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2014
|
Vol. 9, no 1
7--16
EN
Paper presents short operational and engineering analysis of underpowered propulsion in small electrically propelled small inland passenger ships. There is evidence that in certain weather conditions the phenomena of added aerodynamic resistance of small water crafts may have serious influence on their speed and manoeuvrability. Existing regulations like class societies rules for ship classification and construction or EU Directive 2006/87/EC do not provide any requirements or guidelines on prediction of air or hydrodynamic resistance or propulsion power computations to be assessed by third party in design process. In the opinion of authors , the case is particularly important when electrical or hybrid propulsion is considered as prime mover. Existing knowledge allows for engine ering analysis to be conducted to provide better knowledge on the selection and construction of innovative propulsion machinery for ships where passengers safety is major factor of concern by wate rways administration, class societies and insurance institutions.
11
Koncepcja i projekt żurawia pokładowego z kompensacją ruchu statku na fali
Dymarski C.
Hydraulika i Pneumatyka
|
2013
|
nr 6
20--24
12
Content available Computational model for simulation of lifeboat motions during its launching from ship in rough seas
Dymarski P., Dymarski C.
Polish Maritime Research
|
2012
|
nr 3
45-52
EN
This paper presents a computational model which describes motion of an object of six degrees of freedom (DoF), intended for simulation of spatial motion of one- or two- rope-sling lifeboat or rescue boat during its launching from ship in rough sea. This is a complex model which accounts for sea conditions as well as elasticity and damping properties of davit’s elements and mechanisms, rope and boat hull. Also, are presented results of example calculations for an assumed set of technical parameters of davit and boat as well as sea conditions.
13
Content available An integrated hydraulic drive system of a novel device for launching lifeboats from large passenger ships
Dymarski C.
Polish Maritime Research
|
2012
|
nr 1
3-10
EN
This paper presents a continuation of the projects [5, 6] dealing with the novel concepts of evacuating people from large passenger ships. A novel integrated drive and control system for chain lift with lifeboats fastened on it as well as for stern port- ramp, is presented. Additional novel elements is the application of the stern port - ramp fitted with a buoyancy element, and its increased capability of automatic adjusting its operational deflection in the case of a large forward trim of ship. It increases safety and comfort of evacuation in the difficult conditions, but to obtain it a more complex drive and control system has been required to be designed.
14
Content available Design solution and selected research results of the sea-wave energy converter
Dymarski C., Dymarski P.
Journal of Polish CIMAC
|
2012
|
Vol. 7, no 1
45-56
EN
The paper presents a novel device, a special buoy, for capturing the energy of sea-waves and the design of its model for conducting test in a towing-tank. The paper also presents the research program and general analyses on selecting the turbine and hull form, systems of anchoring and propulsion. In addition, it includes some chosen results of model tests and numerical calculations. Model of the buoy at the scale of 1:5 was tested in the towing tank for some range of wave height and its frequency and for two value of column length, a few states of ballast and tension of the anchor ropes. Numerical calculations were conducted for the same conditions and additionally for several anchor systems as well.
15
Content available A new design of the poded azimuth for a diesel-hydraulic propulsion system of a small vessel
Dymarski C., Zagórski M.
Journal of Polish CIMAC
|
2011
|
Vol. 6, no 1
33-42
EN
The paper presents a comparative analysis of different kinds of ship propulsion systems with azimuth thrusters and also constructional solution of an azimuth thrusters destined for small vessel with diesel-hydraulic driving system. Characteristic feature of the thrusters is localization under the water of the main hydraulic motor which drives a fixed pitch propeller located inside a nozzle. The motor is attached to the pod which is fixed to rotatable 360 ° vertical column with nozzle. The shaft of the motor is directly coupled inside pod with propeller shaft. The column is driven by a small hydraulic motor through planetary and cylindrical gears. The thruster has been build and preliminary tested at HYDROMECH Company and now is prepared for laboratory research.
16
Content available A concept of drive and control system of a novel device for people evacuating from large passenger ships
Dymarski C.
Polish Maritime Research
|
2010
|
nr 4
54-58
EN
Year-after-year increasing number and size of sea-going passenger ships make it necessary to search for novel methods of evacuation of passengers from such large objects or to improve those which have been applied so far. This paper presents a concept of one of the original methods, in which, a.o., chain lifts have been applied to hold up life boats during voyage as well as to launch them in case of evacuation. Technical assumptions and requirements as well as schematic diagram of the hydraulic drive and control system of the lift, is presented.
17
Content available remote Wybrane problemy regulacji i eksploatacji pneumatyczno-hydraulicznych układów sterowania skoku okrętowych śrub nastawnych
Dymarski C.
Napędy i Sterowanie
|
2010
|
R. 12, nr 10
108-113
PL
W pracy przedstawiono wybrane problemy regulacji pneumatyczno-hydraulicznych układów sterowania okrętowych śrub nastawnych. Posłużono się przy tym opisem wypadku uderzenia specjalistycznego statku pożarniczego w pirs paliwowy w Porcie Północnym w Gdańsku. Podjęte przez autora czynności, w tym analizy i komisyjnie przeprowadzony eksperyment, pozwoliły wyjaśnić przyczyny tego zdarzenia. Należy sądzić, że zaprezentowanie przeprowadzonych prac wyjaśniających i ich wyników stanowić może dobry materiał poznawczy dla projektantów i użytkowników układów sterowania.
EN
The paper presents selected problems of the controllable pitch propeller pneumatic and hydraulic control systems. For this purpose description of the collision of the rescue fire ship with the trestle of the fuel pier in the North Port in Gdansk was used. Activities undertaken by author, included analysis and collectively conducted experiment enabled explaining the reasons of the event. It might have been expected that presented description of explaining works and theirs results are a useful knowledge material for designers and users of the control systems.
18
Content available Some adjustment and exploatation problems of the controllable pitch propeller pneumatic and hydraulic control systems
Dymarski C.
Journal of Polish CIMAC
|
2010
|
Vol. 5, no 2
67-71
EN
The paper presents selected problems of the controllable pitch propeller (CPP) pneumatic and hydraulic control systems. For this aim a description of the collision of the rescue fire ship with the trestle of the fuel pier in the North Port in Gdańsk was used. Activities undertaken by author, included analysis and an experiment conducted by a commission, permitted to explain the reasons of the event. It is expected that presented description of the works and their results will be a useful knowledge material for designers and users of the control systems.
19
Content available Calculation of motion trajectory and geometric parameters of the trawl during pelagic fishing
Dymarski C., Nakielski J.
Polish Maritime Research
|
2009
|
nr 4
51-56
EN
This paper presents a mathematical model of the mass centre motion trajectory of the trawl, its main geometrical parameters, way of solving the model as well as its example results. It could be useful to define optimum parameters of safe, effective and environmentally friendly pelagic fishing.
20
Content available Analysis Of Ship Shaft Line Coupling Bolts Failure
Dymarski C., Narewski M.
Journal of Polish CIMAC
|
2009
|
Vol. 4, no 2
33-40
EN
The ship propulsion shaft line is one of the most critical ship components having big influence on a ship safety. Because of that, there is well known need for proper shaft line survey either by ship crew, ship owner technical services as well as by classification society surveyors. One of the most dangerous and frequent kind of shaft line failures, especially on old ships, is a fatigue break of the collar coupling bolts. It usually causes the loss of the possibility to use the main propulsion system. In case of the bad weather and severe sea conditions it can lead even to the ship loss. The paper presents some data on failure statistics that was observed to shaft lines and propulsion system machinery. Furthermore, analyses of causes and generation mechanism of the mentioned fatigue breaks of the collar coupling bolts is presented.
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