Design of a constant diameter retractable Jet-ring with inside-out jetting combined with a Vibro-hammer

Reducing noise pollution during offshore monopile installation is crucial for marine life. Current installation methods create too much noise or do not have the certainty of reaching the required depths. By using a Vibrohammer combined with a Jet-ring this problem could be solved. A Jet-ring is a tool to reduce the sand induced inside shaft...

Workability optimisation of the Stella Synergy: during monopile installation with a motion-compensated gripper and using its DP-system

Using a floating vessel operating on its DP-system and using a motion-compensated pile gripper to install monopiles could be the installation method of the future. Therefore, this thesis focuses on this method. The main objective of this thesis project is to build a model that accurately describes the motions of the Stella Synergy, the monopile,...

Upending of a Monopile for an Offshore Wind Turbine Foundation

The subject of this report is the upending of a floating monopile for an offshore wind turbine foundation. This is an assignment of Van Oord Dredging and Marine Contractors BV. An analytical model has been developed to simulate the upending of a monopile in MapleTM, based on the general theoretical principles and the experience of Van Oord. An...

On the modelling of installation effects on laterally cyclic loaded monopiles

Monopiles are being used more extensively for offshore wind turbine foundation. Current guidelines on the construction of fixed offshore foundations still base the design of laterally loaded piles in sand on empirical data (p-y curves), originating from the oil and gas industry, from field tests executed in 1974 on 0.61 m diameter piles. However...