Attachment A—Fault Trees for Different Dynamic Positioning Systems

2021 ◽  
pp. 143-151
Author(s):  
Tarannom Parhizkar ◽  
Ingrid B. Utne ◽  
Jan-Erik Vinnem
Keyword(s):  
Dynamic Positioning ◽  
Fault Trees ◽  
Positioning Systems

Aspects of Importance Related to Arctic DP Operations

2012 ◽  
Author(s):  
Arne Gürtner ◽  
Bror Henrik Heier Baardson ◽  
Glenn-Ole Kaasa ◽  
Erik Lundin
Keyword(s):  
Boundary Conditions ◽  
New Technology ◽  
Open Water ◽  
The Arctic ◽  
Dynamic Positioning ◽  
Positioning Systems ◽  
Business Opportunities ◽  
New Business ◽  
Drifting Ice

International operators are seeking, investigating and pursuing new business opportunities in the Arctic. While operating in the Arctic, there will be a considerable need for vessels to keep their position during various operations which may include lifting, installation, crew change, evacuation, and maybe drilling. Opposed to open water, the drifting ice poses severe limitations as to how stationkeeping operations may be carried out. Dynamic positioning systems are currently developed aiding stationkeeping without mooring systems. There is a considerable need to enhance the open water DP systems for use in a new forcing environment. Essentially a new technology has to be developed with time. For that reason, considerable knowledge is required concerning current limitations and boundary conditions. This paper addresses some of the generic challenges related to DP operations in ice together with relevant learnings which are employed in mentioned DP enhancements.

SLIDING MODE CONTROL APPLIED TO OFFSHORE DYNAMIC POSITIONING SYSTEMS

2009 ◽  
Vol 42 (18) ◽  
pp. 237-242 ◽  
Author(s):  
Adriana C. Agostinho ◽  
Lázaro Moratelli ◽  
Eduardo A. Tannuri ◽  
Hélio Mitio Morishita
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Dynamic Positioning ◽  
Positioning Systems ◽  
Mode Control

scholarly journals Energy efficient propulsion system for dynamic positioning application: design and assessment

2018 ◽  
Author(s):  
A Coraddu ◽  
S Donnarumma ◽  
K Chu ◽  
M Figari
Keyword(s):  
Energy Efficient ◽  
Propulsion System ◽  
Critical Conditions ◽  
Dynamic Positioning ◽  
Complex Task ◽  
Objective Functions ◽  
Environmental Disturbances ◽  
Positioning Systems ◽  
Thrust Allocation ◽  
Validation Tool

Dynamic positioning systems are most commonly used in offshore operations. They provide an automated controlling of position and heading of the vessel using its own thrusters to compensate environmental disturbances. The allocation of total required force over the available actuators is a complex task, as DP-systems are over-actuated. Therefore, one of the main challenges faced by the industry is constantly seeking to improve the systems efficiency for both sustainability and economic reasons. Furthermore, it is important to evaluate the performance of a DP vessel under critical conditions. In this paper, the authors aim to compare different thrust allocation logics based on the optimisation of different objective functions. Using a simple validation tool, the authors were able to investigate the overall efficiency of a dynamic positioning propulsion system and its ability to operate when a failure occurs. 

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