Theoretical predictions using 3-dimensional potential theory for the mean drift forces on moored floating structures like semi-submersibles and tension leg platforms show discrepancies in both regular and irregular waves when compared with results of model tests. Such divergence is further pronounced in the low frequency range where diffraction effects are s… [more]
Authors: A.K. Dev
In this study the behaviour of fast monohulls in head waves will be investigated. The occurrence of high peaks in the vertical accelerations experienced by these ships while sailing in head waves is the limiting factor for the safe operation. The methods most commonly used for the calculation of the motions and accelerations of these ships in waves are not c… [more]
Authors: J.A. Keuning
Accurate prediction of representative design loads and, hence, the structural response is the key factor in performing successful design of marine structures. In most cases these design loads can be determined separately from the structural analysis and then applied to the structure in order to find the structural response. However, in some cases these loads… [more]
Authors: A. Bereznitski
Conceptual design is the first phase in the design process in which both the design problem and the way to solve the problem are not exactly known. Starting with an initial specification, the most promising concept should be generated. However, as the design process proceeds more information becomes available, which may introduce new design questions or revi… [more]
Authors: C.G.J.M. van der Nat
This thesis describes a model (the 'Ship Mobility Model') that predicts the behaviour of the propulsion system of a maneuvring ship. The model is set up for a twin shaft, diesel engine-propeller driven slender ship. The thesis has two abstract ion levels. The basic level consists of the presentation of the general model layout and the specific details of the… [more]
Authors: P.J.M. Schulten
Attached cavitation is a form of cavitation that is prevalent on nearly all ship propellers. The technical and financial constraints of the hull form and propulsion plant rarely allow for a propeller with a low loading, a low rate of revolutions, and a favorable inflow. Although some science vessels and surface combatants have propellers designed to operate … [more]
Authors: E.J. Foeth
The aim of this work is to create a semi-automated method for the assembling, execution and maintenance of parametric design models.
In spite of the array of available computer languages and tools for solving numerical problems, the actual assembling of the numerical models has thus far obtained little research attention. Within the available tools, the act… [more]
Authors: M. Th. Van Hees
Berekening van de snijkrachten bij het snijden van volledig met water verzadigd zand.
Basistheorie en toepassingen voor 3-dimensionale mes-bewegingen met periodiek variërende snelheden voor, bij het baggeren gebruikelijke, snijdende ontgravingsmiddelen.
Het doel van het in deze dissertatie beschreven onderzoek, is het komen tot een wetenschappelijk onderbouw… [more]
Authors: S.A. Miedema
Stromingsmechanismen van zand-watermengsels in pijpleidingen
Dit proefschrift behandelt het hydraulisch transport van vaste stoffen in pijpleidingen. Er wordt een samenvatting gegeven van de resultaten van een onderzoek uitgevoerd om het stromingsgedrag van zand-watermengsels in pijpleidingen te beschrijven en een methode op te stellen voor het voorspellen v… [more]
Authors: V. Matousek
The European inland waterway transport sector is a highly competitive one. The transport operators in this sector are mainly small companies with only one ship. Such companies have very few possibilities to distinguish themselves from their competitors. At the same time their main asset, their ship, is often highly standardized.
In this thesis, it is researc… [more]
Authors: R.G. Hekkenberg