Vector and total field data inversions for magnetometer UXO surveys in the North Sea: An alternative to the industry standard

As an alternative to the industry standard processing of total field data, a Basin-hopping inversion can be used. Another alternative is the use of vector field magnetometers, which can be processed with a Gauss-Newton inversion. Both the Basin-hopping and Guass-Newton inversion consist of a two step inversion. First, an inversion to estimate...

Nuclear reactors for marine propulsion and power generation systems

Nuclear power is currently not a commonly used option in commercial marine applications, despite its potential for significant emission reductions. This thesis is an overview of what has been done before, and what the potential is of modern marine nuclear power applications considering the long-term goals of harmful emission reduction in the...

Marine Unexploded Ordnance Detection with the Transient Electromagnetic Method: A Numerical Feasibility Study

The hazards of unexploded ordnance threaten the increasing marine construction activities nowadays, which increases the importance of unexploded ordnance detection. Research has shown that transient electromagnetic methods can successfully be used to detect unexploded ordnance on land. New equipment is being developed to make marine unexploded...

Development and Analysis of Advance Velocity Observers for Marine Propulsion Systems

Marine propulsion systems with diesel engines face continuous variations in propeller shaft speed and torque during operation, due to waves and changing rudder and water inflow angles. Traditional propulsion control systems do not take these variations into account, and attempt to maintain a constant shaft speed. These changing torques, in...

Identification of response amplitude operators for ships based on full scale measurements

Heerema Marine Contractors (HMC) operates several crane vessels, barges and tug boats for the transportation, the installation and the removal of offshore facilities. To achieve safe and successful projects, the accurate prediction of vessel motions is of great importance. Vessel motions are calculated on the basis of wave energy spectra and...

The design of a luxury superyacht tender based on the 12,3m RIB hull of Xtenders

This project started with a visit to Xtenders where a tough model of a new concept came to my attention. This sketch looked different from at the time produced by Xtenders models and evoked some curiosity that emerged into the graduation thesis. Xtender is a Dutch brand that builds yacht tenders. The main advantage of the product has been...

Design of the Marine Toilet

This report describes the development of the new Vetus marine toilet concept proposal, the Fix&GO, for the Dutch aftermarket of do-it-yourself small cabin motor yacht owners. The Fix&GO marine toilet combines comfort, cleanability and serviceability in a unique way. It brings comfort into the limited marine lavatory while also providing ease and...

Development of a multiobjective design optimization procedure for marine propellers

The design of a marine propeller is characterized by its complexity rather then its shortcoming of knowledge how to asses its performance. There are several constraints to satisfy and all are in a different field. The three major considerations are strength, performance (efficiency) and cavitation behavior. There is not a perfect design...