Motion Control System for Offshore Lifting Operations

This MSc thesis presents an investigation into motion control systems aimed at reducing swing motion of a lifting load during offshore heavy lifting operations. Two distinct models are developed for this objective. Subsequently, an analysis is done to assess the impact of various control aspects.<br/><br/>First, an assessment of the offshore...

DP challenges in Ana platform jacket installation

Installation of jacket platforms requires simultaneous and combined operations of multiple assets. When the whole process has to be planned, it is necessary to predict in a fast and reliable way the possible weather limitations that may occur during the operations. The paper will present the major challenges of this unusual and innovative...

Installation of the Subsea Buoyancy Gravity Energy Storage System: Assessing the dynamic behaviour of the SBGESS during ultra-deep water installation by using non-linear vertical displacement models

To meet the targets set at the Paris climate convention, a rapid decrease in the emissions caused by the process of extraction of fossil fuels is required. Especially offshore, where a grid-connection is often non-existent, having power supplied by local renewable energy sources with a variable power generation can potentially lead to problems...

Fatigue analysis for offshore power cable installation

Over the last decade, the demand for offshore power cables has increased significantly due to, in particularly, the emergence of offshore wind. Despite this growth, industry-wide rules and guidelines to analyse fatigue during cable installation operations are yet to be developed, even though fatigue can become an important...

Backstepping Control of Heavy Lift Operations with Crane Vessels

Offshore structures with large mass are installed and removed by heavy lift vessels. During offshore constructions, two safety-critical interconnected operations take place, the dynamic positioning of the vessel and the lifting of the heavy structure by an immovable boom crane on the vessel. Existing studies on offshore boom crane control...

Monopile installation assessment: A critical assessment of an oscillating monopile during offshore installation

An offshore wind turbine requires a stable support structure to support the tower and nacelle. The support structure in the form of a monopile is lowered to the seabed and hammered in the soil. During the lowering process the monopile may show excessive motions, that occur on an irregular basis. The cause for this is unknown. This thesis is...

Environmental limitations in suction bucket based jacket foundation installation, using vertical lift-off from a jack-up vessel

In order to gain insight in maximum wave conditions in which installation of a four-legged suction bucket based jacket foundation could safely take place, a 2D time domain MATLAB model has been created, containing the most important features of a heavy lifting jack-up crane vessel and its appropriate rigging elements. The model is used to...