The product work breakdown structure (PWBS) of a shipyard defines both the interim product breakdown and the work breakdown. Shipyards that have a well defined PWBS can effectively reduce man-hours ...by applying techniques of group technology and hull block construction method (HBCM). In this paper, a case study of typical double-bottom blocks of both a car carrier and a self-unloading bulker vessel designed in different shipyards, are analyzed. Since each shipyard applies a different interim product breakdown structure (PBS), a best practice tabular comparision demonstrates which PBS is better. The conclusion is that different shipyards under the same corporation should objectively apply best practice methods which recognize and apply what is best from one yard to the other yard and vice-versa. This will raise the competitiveness level of both shipyards.
Brodovi i razni drugi pomorski objekti nakon određenog vremena provedenog u ekspoataciji, ili zbog nekih izvanrednih okolnosti kao što su havarije, moraju obaviti remont u nekom od remontnih
...brodogradilišta. Objekti se najčešće dokuju zbog izvođenja raličitih radova vezanih uz podvodni dio trupa ili zbog periodičnih pregleda vještaka Registra i sl. Primjeri takvih radova su sanacije oštećenja
trupa, radovi na propeleru, listu kormila, AKZ tretman podvodnog dijela trupa. Remont se najčešće odvija na plutajućim dokovima na kojima se brod ili neki pomorski objekt relativno jednostavno digne
iz vode. Uz pomoć plutajućih dokova remont se može izvršiti jednostavno i brzo. Ovaj rad pokazuje detaljan prikaz procesa te akcije potrebne za izvršavanje nekog od istih te njihova moguća poboljšanja.
The authors propose a synergy of expert approach methods through the Systematic layout planning (SLP) and Analytic Hierarchy Process (AHP) as tools for the shipyard production process design towards ...an optimal material flow, in combination with Simulation modeling (SM). Most production process designs are based on the conventional methodology of comparison initiating with benchmarking. Such approach can be misleading. For more reliable and efficient results, the approach suggested by the authors uses a combination of the mentioned three methods within the frame of an expert approach. Firstly, the Systematic layout planning is used for generating a larger number of suboptimal shipyard production process design alternatives. Then, these alternatives are analyzed through an objective decision making tool to reach an optimal material flow alternative. Further, such optimal alternative is tested and evaluated by Simulation modeling (SM). Finally, the presented methodology is confirmed on a case study as a viable approach to an efficient and reliable shipyard production process design.
Typical application of bidirectional DC/DC power converter exists in hybrid cars. Recently, a similar approach has been applied in hybrid propelled ships as well. In this paper, a novel low power ...bidirectional DC/DC power converter of standard Buck/Boost topology has ben designed in order to explore possibilities of the high power design in maritime applications. In order to discover critical points of a design, thermal imaging has been investigated. The results clearly indicate that the proposed solution is more cost effective than a typical standard bidirectional DC/DC power converter. Likewise, the improvement in maneuvering of the propelled vessel system with two and more electric drives has been investigated and compared to a classical diesel, single engine propulsion system.
The paper focuses on two aspects. One is SENER incentives to work with the educational community by providing the FORAN software as a collaboration mean that centres on helping to develop the FORAN ...system, and the other way around the use of the FORAN system for academic purposes in universities, to improve and complement the teaching and training process for students. The second part of the paper focuses more on a technical details on the design procedure for the damage stability and the safety assessment criteria that is established accordingly. Stability assessment is performed using the FORAN software, with the creation of explicit damage events by a fully automated simulation, established from the uniformly distributed random numbers with given probability distributions for size and position of damage and an example on a container ship presented.
Brodograđevna industrija spada u jedne od najkompleksnijih proizvodnih industrija. Dugi niz godina se nastoji postići optimalna proizvodnja, sa minimalnim gubicima i maksimalnim rezultatima konačnog ...proizvoda-broda. Da bi se omogućio takav pristup proizvodnji potrebno je redovito modernizirati proizvodne procese u brodogradilištu tj. biti u toku sa svjetskim trendovima u proizvodnji broda. Ulaganje u unapređenje proizvodnih linija je ključan i primaran potez za postizanje ušteda. U svijetu industrije je zavladao trend težnje za automatizacijom i robotizacijom proizvodnih pogona iz razloga jer još uvijek nije postignut željeni i zadovoljavaći stupanj automatizacije/robotizacije. Iz tog razloga većina brodogradilišta je u stadiju djelomično automatiziranih i robotiziranih pogona radi čega je još uvijek vrlo veliki postotak prisutnosti ljudske radne snage. U ovom članku će se osvrnuti na nedostatke proizvodnog procesa promatranog brodgradilišta sa ciljem davanja uvida u mogućnost optimiziranja predmontažne faze gradnje broda.
The shipbuilding industry plays an important role in increasing employment and productivity the national industry. It is especially important when the market has fallen due to the influence of the ...global economical crisis. This paper is based on modular outfitting concepts which are used in modern shipyards, with the aim of optimising the shipbuilding production process by increasing the portion of modular vessel outfitting as a way of shortening the duration of the shipbuilding process, reducing costs and increasing competitiveness without investing in new facilities, machines and tools. To illustrate the cost savings potential obtained by this research, a comparable procedure for cost benefit estimation for a conventional strategy versus cost estimation for a modularised design approach and relevant build strategy is developed. On the basis of the results it is possible to measure cost benefit as a consequence of using the modular outfitting concept within the shipbuilding process.
The shipbuilding industry is very competitive, and shipyard management must strive to
improve productivity as a way of keeping up with the competition. Analysis of the assembling
of interim products ...through shipyard process lanes is important from a standpoint of modern
shipbuilding techniques and methods which includes the lean manufacturing and design for
production concepts. Whereas the design for production concept has bean readily applied in
many shipyards, a lean manufacturing methodology for shipyards is lacking. Therefore, the
aim of this dissertation is to provide a methodology for improving flow of interim products by
applying the lean manufacturing concept. Since shipyard management is usually not sure how
to approach a transformation of its facilities due to the risks involved, this dissertation couples
lean transformation with risk analysis to compare the key parameter for comparing
productivity, man-hours. Based upon this it is clear that while making design for production
(DFP) changes will improve productivity up to 30% when technology changes are made in
complement with methodology changes, application of the lean manufacturing methodology
brings productivity improvements of 60%.
The shipbuilding industry is very competitive, and shipyard management must strive to
improve productivity as a way of keeping up with the competition. Analysis of the assembling
of interim products through shipyard process lanes is important from a standpoint of modern
shipbuilding techniques and methods which includes the lean manufacturing and design for
production concepts. Whereas the design for production concept has bean readily applied in
many shipyards, a lean manufacturing methodology for shipyards is lacking. Therefore, the
aim of this dissertation is to provide a methodology for improving flow of interim products by
applying the lean manufacturing concept. Since shipyard management is usually not sure how
to approach a transformation of its facilities due to the risks involved, this dissertation couples
lean transformation with risk analysis to compare the key parameter for comparing
productivity, man-hours. Based upon this it is clear that while making design for production
(DFP) changes will improve productivity up to 30% when technology changes are made in
complement with methodology changes, application of the lean manufacturing methodology
brings productivity improvements of 60%.
Brodograđevna industrija je vrlo konkurentna i uprave brodogradilišta moraju nastojati
poboljšati proizvodnju radi održavanja položaja na tržištu. Analiziranje načina sastavljanja
međuproizvoda kroz brodograđevni proces je važno sa stajališta modernih brodograđevnih
tehnika i metoda koje uključuju koncepte vitke proizvodnje i projektiranja za proizvodnju.
Dok se koncept projektiranja za proizvodnju koristio u mnogim brodogradilišta, metodologija
za vitku proizvodnju nedostaje. Cilj ove disertacije je omogučiti metodologiju za poboljšanje
protoka međuproizvoda kroz primjenu koncepta vitke proizvodnje. Uprave brodogradilišta
često puta nisu sigurne kako najbolje pristupiti transformaciji svojih postrojenja radi
postojećih rizika. Ova diseratcija povezuje vitku transformaciju sa analizom rizika radi
usporedbe ključnog parametra u uspoređivanju produktivnosti, efektivnih radni sati. Postaje
jasno kako kreiranje promjene korištenjem koncepta projektiranja za proizvodnju poboljšava
proizvodnju do 30% kada promjene na tehnologiji se naprave komplementarno sa
metodologijom, dok aplikacija koncepta vitke proizvodnje donosi poboljšanje proizvodnje od
60%.
The paper focuses on two aspects. One is SENER incentives to work with the educational community by providing the FORAN software as a collaboration mean that centres on helping to develop the FORAN ...system, and the other way around the use of the FORAN system for academic purposes in universities, to improve and complement the teaching and training process for students. The second part of the paper focuses more on a technical details on the design procedure for the damage stability and the safety assessment criteria that is established accordingly. Stability assessment is performed using the FORAN software, with the creation of explicit damage events by a fully automated simulation, established from the uniformly distributed random numbers with given probability distributions for size and position of damage and an example on a container ship presented.
'Design for production' principles have been applied in multiple industries with varying degrees of success. The shipbuilding industry has also started to apply these advanced principles for adapting ...vessel design towards production friendliness and vice versa. In order to maintain global competitiveness, shipyards must constantly improve upon existing processes in order to cut costs and increase profit. Therefore, in this paper the shipbuilding process of assembling interim products has been identified as an area where production costs could be reduced through the application of an improved 'design for production' methodology. The two principle interim product assembly methods are analyzed and a work content analysis of a typical double bottom block is performed. In order for the application of the 'design for production' methodology to be practical for shipyard management in making decisions with minimal risk with regards to choosing the most appropriate method for assembling interim products for the present technological state of the shipyard, risk analysis by use of the Monte Carlo method is undertaken. In this way, the application of the 'design for production methodology' is improved upon and new insight is developed concerning the optimal method for development of interim product assembly for the future state with complementary adjustments to the shipyard technology level.
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