Ugur Bugra Celebi

Predictions of oil/chemical tanker main design parameters using computational intelligence techniques

Abstract: Ship design and construction are complicated and expensive processes. In the pre-design stage, before the construction according to some special rules, determination of the main ship parameters is very important. In this study, instead of traditional methods, the oil/chemical tanker main design parameters are estimated by 18 computational intelligence methods. Therefore, all the data of 114 tankers in operation are used in the experiments in order to estimate a parameter from the remaining ones. Main result of this article is to show that, except for the speed parameter, the main parameters of tankers can be estimated sufficiently well for pre-design stage without having to apply conventional but arduous ship modeling experiments.

Emission Routing in Maritime Transportation

Shipping runs the major part of world trading with a ratio of over 90 %. The great carrying capacity of ships makes them indispensable elements of transportation of goods. In addition to economical concern, ships are very important actors for pleasure and military purposes. Due to their great benefits, shipping activities are responsible for considerable amount of emissions and wastes in various forms such as solid, liquid and gaseous. Most of the air emissions are produced during the operation phase. It is estimated that there 450 different types of emissions to air due to the internal combustion process in ship engines’. The most important emissions are carbon dioxide (CO2), carbon monoxide (CO), oxides of nitrogen (NOx), oxides of sulfur (SOx), volatile organic compounds (VOC’s) and particulate matter (PM). Due to the nonignorable, positive and proved harmful effects of these emissions to global warming, all alternative reducing techniques must be considered. In this study, twobulk carriers, which use the same route, are compared in terms of emission production to air. Two scenarios are designed. In first scenario, Ship A, which is 80,000 DWT, voyages the same route with full load to reach a total 80,000 DWT cargo. In second scenario, Ship B, which is 40,000 DWT, voyage the same route with Ship A, two times to reach a total 80,000 DWT. Thus, the optimum way to carry the load is determined in terms of emissions.

Comparison of different neural networks performances on motorboat datasets

Calculation of the required engine power and displacement takes an important place in the initial design of motorboats. Recently, several calculation methods with fewer parameters and with a possible gain of time compared to classical methods have been proposed. This study introduces a novel calculation method based on neural networks. The method requires less data input and hence is more easily applicable than classical methods. In this study several different neural network methods have been conducted on data sets which have principal parameters of motorboats and the respective performances have been presented. From the results obtained, displacement and engine power prediction for motor boats can be used at a suitable level for ship building industry.

KISITLAR TEOREMİ YAKLAŞIMIYLA YENİLİKÇİ TERSANE PROJE YÖNETİMİ GELİŞTİRİLMESİ

Tersane endustrisinde agir kosullar altinda zararli malzemelerle gerceklestirilen uretim surecleri icin buyuk bir isgucune ihtiyac vardir. Gemi insaa sureci, celik levhalarin kesimi ve isaretlenmesi, celik uretimi, bloklarin birlestirilmesi, kizakta insa, geminin suya indirilmesi, deneme seferleri ve geminin gemi sahibine teslimi alt sureclerinden olusur. Blok uretimi tersanelerdeki en temel uretim surecidir ve cok sayida girdi ile birbirine bagli ve gemi yasam dongusunde kendisinden sonraki surecleri etkileyen alt sureclerden olusur. Bu yuzden verimli bir uretim sureci icin iyi bir uretim planlamasinin yapilmasi gereklidir. Gelismekte olan cevresel duyarlilik nedeniyle yenilikci yontemlerin kullanilmasi da ayrica onemlidir. Bu calismada tekrarlayan uretim konseptine sahip bir tersaneden is akisi ve cesitli veriler temin edilmis olup kritik zincir, proje ve besleme stoklari hesaplanmistir. Temin edilen degerler, hesaplamalar sonucunda elde edilen sonuclarla karsilastirilmis ve yeni sonuclarin daha verimli bir uretim sureci olusturulmasina katkida bulundugu tespit edilmistir.

The Effect of Parameter Selection on Fume Formation Rate in SMAW of AH36 Shipbuilding Steel and Analysis with ANOVA Method

Welding is one of the most crucial manufacturing processes in shipbuilding and it is hazardous in terms of occupational safety and health. Fume emissions and gases emerged from welding are emitted to the welder’s breathing zone and the surrounding environment. Shielded metal arc welding is one of the most utilized arc welding processes in shipbuilding and fume emissions caused by welding electrodes are one of the most important pollutant sources in shipyards. In this study, welding of AH36 shipbuilding steel with covered rutile and basic electrodes using variety of welding parameters, analyzed by Anova method, has been realized. Fume formation rates from these experiments have been measured and results have been evaluated in terms of worker’s health and environmental friendliness.

Ship Life Cycle Greenhouse Gas Emissions

The international maritime transport sector is known as one of the oldest industries in the world. Ships are used for various purposes from transportation to military and they are considered vital for global trade since their main use is for the transport of goods around the world. Currently, the international commercial shipping sector is carrying out nearly nine out of ten tons of the global cargo transportation needs. Despite the fact that the effect of shipping emissions to global warming is limited when compared to other modes of transport, greenhouse gas emissions constitute a serious issue for shipping as well. Just as any other product, a ship has a life cycle which is expected to last 20–30 years or more. A ship’s life cycle may be divided into four main phases: manufacturing, operation, maintenance and dismantling/recycling. The great portion of emissions occurs during the operational phase due to the propulsion and energy demands of the ship however greenhouse gases are emitted also in other phases of the ship life cycle. In this study, a life cycle concept for ships is comprehensively described and some illustrative emission results are provided in particular for ship greenhouse gas emissions (GHG’s).

Effective Ship Ballast Water Treatment System Management

Shipping runs the major part of world trade. Using ballast water is the most common way to stabilize a ship after loading and unloading the cargo. Taking ballast water after unloading the cargo would increase the ship’s weight. Therefore draught of the ship increases to the level before unloading. Increased draught may be required for proper propeller immersion or any other function. Similarly, ballast water discharging after loading would decrease the draught and thus, the total resistance would reduce. Ballast water is also used by submarines to submerge and emerge as the sole way.

Multimedia Pollutant Sources and Their Effects on the Environment and Waste Management Practice in Turkish Shipyards

Shipbuilding industry is one of the oldest and the heaviest production industries all over the world. There are several production processes which result in hazardous waste and pollutants to the environmental safety and health. Shipyards are often categorized into two basic subdivisions: new shipbuilding division and ship repairing division. The area of the shipyard describes their proficiency; some shipyards build only large ships and also have repair and dry dock facilities while other shipyards have facilities for building small- and medium-sized vessels such as patrol boats, fire and rescue boats, water taxis, ferries, tug boats, fishing boats, and shallow-drafted barges.