A new generation of inland environmentally friendly ships destined for waterways with critical limited depth is presented. General project concepts are supported by push system idea of standardized, optional equipped hulls for desirable exploitation necessities. A few traditional motor ships and barges are described as the background for comparison.
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This paper presents a design concept of a novel passenger segment ship intended for navigating on Berlin- -Królewiec (Kaliningrad) inland waterway route, characteristic of application novel structural materials and engineering processes which make it possible to design structures in an innovative way and provide high operational merits for inland waterways ship. Conceptual, functional and technical assumptions for the designed ship as well as its service program was described. Exceptional features of the designed ship are : the general architectural concept which makes the ship free passing under small-clearance bridges and navigating in narrow and shallow waterways, possible, manufacturing technology of its hull structure made of „sandwich” panels as well as its combustion-electric engine (or combustion-hydraulic engine) propulsion system working on alternative ecological gas fuels.
This paper presents final results of E!2968 EUREKA – ECOLOGICAL DOCK project sponsored by the Polish State Scientific Research Committee. The consortium established for realization of the project is presented, ecological hazards are characterized, the most important legal regulations are specified, as well the design of the ecological floating dock SINE 212CD and a concept of conversion of the existing dock SINE 126CD to the class CLEAN is characterized. The paper also contains the complete bibliography of the elaborations done within the project. More information can be found on the web page www. oce.pg.gda.pl/oce2/eureka . This paper opens the series of the selected publications on various problems solved in the frame of the project, which are presented below.
The paper outlines the origin of the E. 2 772! project from the EUREKA group of European projects. Justification of undertaking the subject is given as well as the structure of institutional performers constituting the project executive consortium. Characterised is the final result in the form of preliminary designs of four modern ecological Baltic short shipping vessels: container carrier, product tanker, ro-ro ship and river-sea type ship. Comprehensive bibliography contains a list of all the project reports, which may be made available to the interested parties after a contact with the project coordinator. The paper opens a series of topical papers selected from the different problems dealt with in the project.
Omówiono aktualny stan wiedzy w zakresie przyczyn uszkodzeń kadłubów statków w eksploatacji. Wskazano na złożoność konstrukcji kadłuba. Podano zasady stopniowej dekompozycji analitycznej i badawczej konstrukcji do rozważań na różnych poziomach szczegółowości. Uwypuklono zasady tworzenia baz danych dotyczących pękania konstrukcji kadłubów statków. Przedstawiono generalne zasady realizacji eksperymentów laboratoryjnych wielkogabarytowych modeli konstrukcji kadłubów. Scharakteryzowano założenia upraszczające metodykę i algorytm postępowania przy obliczeniowym prognozowaniu trwałości zmęczeniowej węzłów konstrukcji kadłuba statku.
EN
The paper presents current state of know how in the area of ships hull damages in operation. Complex character of hullo structures is taken into account. Principles of decomposition of ship hull structure for analytical and test purposes for fatigue analysis, creation of data base of typical structural crack and fatigue experimental investigations are briefly characterized. Assumptions, and simplifications related of analytical fatigue life prediction methodology for ship hull structures are presented.
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Omówiono charakterystyczne etapy rozwoju i aplikacji problematyki zmęczeniowej w odniesieniu do konstrukcji statków. Wskazano na dalsze uwarunkowania rozwoju problematyki.
EN
Characteristic development stages of fatigue problems of ship hull structures are presented. There are discussed: scope and methods of experimental tests, algorithms of theoretical analysis, that are currently applied by Classification Societies. The directions of fatigue problems development are pointed at.
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Przedstawiono wyniki badań skuteczności napraw pęknęć zmęczeniowych skrzyżowania wiązarów okrętowych ze stali St41. Naprawy realizowano poprzez zaspawanie. Wskazano, że przez odpowiedni dobór stopiwa można znacząco polepszyć trwałość po naprawach.
EN
Results of laboratory investigations of fatigue cracks repair which occur in ship hull girders are presented. Natural scale models were made from St41 type steel. Repairs were carried out by means of cracks overwelding. Results showed that adequate selection of weld materials cansed increased fatigue life after repairs.