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Review of assembly sequence planning methods in terms of their applicability in shipbuilding processes

Taraska M., Iwańkowicz R., Urbański T., Graczyk T.

Polish Maritime Research

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2018

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S 1

124--133

EN

The article characterises the sea-going vessel hull assembly processes and then reviews the existing assembly methods of mechanisms and welded ship structures. Classification of these methods is done with respect to selected criteria of their applicability to hull assembly. Selected methods are used for calculations performed on a model structure and exemplary database. The analysed aspects include the performance of calculation algorithms and the quality of the obtained solutions. Particular attention is paid to the need for reduction of experts’ participation in the planning process due to strong search space explosion effect. The performed analyses have enabled the authors to formulate assumptions for models which would be applicable in real assembly planning in shipyards, as well as to indicate areas of further research which would make it possible to better consider the specificity of production of large-size welded structures.

2

Assessment of technological usefulness of panel production line in shipbuilding process

Urbański T., Graczyk T., Taraska M., Iwańkowicz R.

Polish Maritime Research

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2018

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S 1

134--144

EN

This paper presents assessment of technological usefulness of panel production line in prefabrication process of large ship hull sections, in which special attention is paid to producibility of welding operations. Basing on the assessment these authors worked out hierarchy of analyzed sequences of welding technological processes as well as production line stands used for the processes. The assessment was performed on the basis of analysis of a concept of panel production line based on real production lines functioning in shipbuilding industry, as well as technical documentation of typical hull sections of a multi-purpose ferry. The presented analysis took into account impact of technological - constructional parameters onto producibility of welding process of prefabricated sections. Among these parameters the following were numbered: mass of the sections and number of their elements, total length of welds, labour consumption, material consumption as well as linear heat input in welding operations. On the basis of the achieved results, places which worsen effectiveness of production line operation were identified, as a result it was possible to formulate proposals for modernization of flow prefabrication line for hull sections.

3

Multi-objective evolutionary method for cargo arrangement in a loading space

Taraska M., Iwańkowicz R.

Archives of Transport

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2017

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Vol. 44, iss. 4

65--74

EN

The paper characterises a class of problems for packing boxes in the container. It presents the current state of knowledge in this area and distinguishes evolutionary algorithms, as the most promising in the search for quasi-optimal loading conditions. The method proposed in the paper focuses on certain criteria important from a practical point of view, which in a formalised manner have not been included so far in the solving-problems models. Apart from the traditional consideration of the problem of three-dimensional space loading maximisation, the proposed method considers the deviation of the loaded container weight centre from its symmetry planes and the availability of packages during unloading. New elements in the described method are: the applied criteria, penalty function, way of coding the container loading state in the evolutionary algorithm and fast crossover and mutations operators dedicated to the adopted coding. It was observed that the evolution in the developed algorithm occurs properly, that is seeking to minimise the criteria. The article also includes a calculation example showing the effect of the method with the discussion of the results indicating the advantages and disadvantages of the proposed solution. The performance of the algorithm has been considered in the context of time necessary to obtain the acceptable solution and quality of the obtained solution. It was found that the algorithm in its current form is a strong base for its further improvement.

4

Projektowanie stałoczasowej wieloprogramowej sygnalizacji świetlnej na podstawie badań empirycznych

Iwańkowicz R., Taraska M.

TTS Technika Transportu Szynowego

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2015

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R. 22, nr 12

2596--2600

PL

W artykule scharakteryzowano problematykę sterowania ruchem na skrzyżowaniach potoków ruchu samochodowego i pieszego. Zwrócono uwagę na zagadnienie kolizyjności skrzyżowań i zagrożenia dla bezpieczeństwa uczestników ruchu. Zaproponowano rozwiązanie dedykowane niewielkim skrzyżowaniom o znacznej, powtarzalnej, zmienności natężenia. Metoda opiera się na algorytmie ewolucyjnym, którego rozwiązaniem jest plan pracy sygnalizacji świetlnej podczas całego cyklu podzielonego na fazy. Informacje o ruchu na skrzyżowaniu w różnych porach doby stanowią kluczowe dane wejściowe do obliczeń. Są one gromadzone podczas standardowych badań natężenia ruchu.

EN

The article describes the problems of traffic control at the crossroads of streams of automotive traffic and pedestrian. Attention was drawn to the issue of collisions at junctions and the danger for safety of road traffic participants. We proposed a solution dedicated for small junctions with significant, repeatable, variability of intensity. The method is based on evolutionary algorithm whose solution is a traffic lights work plan during whole cycle divided into separate phases. Information about traffic on junction in different times of the day pose entrance key data for calculations. They are collected during standard research of traffic intensity.