NDLI: Development of Turbine Access System

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Brake, Erik Ter Clegg, Andy Perdrix, Frederic
Copyright Year	2013
Abstract	The offshore wind industry is growing rapidly and the number of personnel transfers between turbines and work boats is increasing. As this is considered an operation that carries a significant risk, a number of improvements have been developed in the industry. In order to provide a cost effective solution optimised for the safety and convenience of operations, a Turbine Access System (TAS) was developed. The functionality of TAS is based on the principle that the motions of the vessel are actively compensated in heave, roll and pitch in order to provide a stable platform for personnel transfer. This paper presents the technical design of TAS, including the development of the global design, the hydraulic system and the control systems. This covers deriving the general arrangement of the unit, obtaining the required inverse motions of the gangway, the means of hydraulic cylinder activation and developing the control system. The control system comprises cascade control with feed-forward and nonlinear compensation in order to minimise trajectory tracking errors. The methodology to derive high degrees of accuracy and smooth operations is discussed alongside the operational logic, monitoring, fault actions and safety features which are accessed through two touch-panel computers. The first TAS came into operation during the summer of 2012 where it was mounted on a 24m catamaran. The sea trials, offshore commissioning and control system optimisation provided extensive amounts of data on the performance of TAS in waves. The results of the performance in waves has been investigated and documented in order to validate the claims of the functionality of TAS. Further optimisation of the motion compensation principle is discussed where the main focus lies on the increase of the operability range beyond the current standards. By changing the bow fenders of the work boat to rollers that provide hydraulic energy dissipation, the additional imposed pitch damping is expected to reduce the boat motions and increase the TAS operability. The paper discusses the methodology and logic behind the active pitch damping devices and the effect on the operation of TAS. The paper discusses the main technical challenges and solutions to achieve a safe, user friendly and comfortable transfer system for the offshore industry.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791855423
DOI	10.1115/OMAE2013-10301
Volume Number	Volume 8: Ocean Renewable Energy
Conference Proceedings	ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2013-06-09
Publisher Place	Nantes, France
Access Restriction	Subscribed
Subject Keyword	Damping Computers Wind Seas Rollers Cascades (fluid dynamics) Boats Vessels Control systems Risk Waves Optimization Hydraulic drive systems Design Errors Hydraulic cylinders Energy dissipation Feedforward control Trajectories (physics) Ocean engineering Motion compensation Safety Turbines
Content Type	Text
Resource Type	Article

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