|Title :||Weight estimation of custom motor yachts in the range between 45 and 65 meters length|
|Author :||Sugimoto, Ryohei|
|Date of defense :||2012|
|Advisor(s) :||Boote, Dario
|Committee's member(s) :||Rigo, Philippe|
|Number of pages :||13|
|Discipline(s) :||Engineering, computing & technology > Civil engineering|
|Target public :||Researchers|
Professionals of domain
|Institution(s) :||Université de Liège, Liège, Belgique|
|Degree:||Master de spécialisation en construction navale|
|Faculty:||Master thesis of the Faculté des Sciences appliquées|
[en] To inform the lightship weight in the early design stage is an important factor to win a contract. Bad quality of weight prediction affects the as-built vessel on many aspects such as load capacity, speed, stability, maneuverability and financial profit. Especially underestimation of lightship weight must be avoided since it makes the draught deeper than expected. Draught plays important role in the registration of the vessel to classification society. There are several requirement from the rules or manufacturer connected with draught. For example, height of portholes from maximum draught is limited by classification society and it’s impossible to modify the place of the portholes upwards.The solution will be to decrease the draught that means decrease of deadweight by reducing fuel or water capacity, for example. On the other hand, accurate weight prediction helps shipyard to obtain clear accounting estimates. And also helps to prepare adequate amount of material or labour. Lightship weight can be calculated perfectly by summing up everything that will go onboard. The problem is that the ship design is iterative process and detailed calculation in the early design stage is not possible since the design is still flexible. Therefore, in the early design stage, weight is usually predicted by a simple formula with a numeral of the vessel as a variable. Numeral can be calculated using principal dimensions and coefficients which is available in the early design stage. Formula can be easily obtained once a numeral is set. The goal of this paper is to find the most suitable numerals and formulas that gives the accurate weight prediction of mega yachts. In theory, the sum of all the predicted weights should be equal to the lightship weight. However, since the variability of data, there will be either positive or negative difference. The accuracy of the weight prediction method will be evaluated by statistical indicator. In the end, the weight prediction method together with total power estimation method are presented.
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