Ultra-Deepwater Floating Platforms Simulation on SPAR Realistic Marine Virtual Environment System

2003 ◽  
Author(s):  
Gerson Gomes Cunha ◽  
Luis Augusto Petrus Levy ◽  
Maria Ce´lia Santos Lopes ◽  
Luiz Landau
Keyword(s):  
Environmental Conditions ◽  
Large Scale ◽  
Scientific Data ◽  
Design System ◽  
Floating Platform ◽  
Visual Effects ◽  
Mooring Lines ◽  
Campos Basin ◽  
Scale Design ◽  
Floating Platforms

This paper presents a new system for offshore floating petroleum platforms design and simulation using virtual reality technology. Environmental conditions and visual effects were introduced together the analysis results to build a realistic experience. The system integrates the capabilities of a large scale design system PROSIM, for design and evaluation of floating structures, mooring lines and rigid or flexible risers under wave, wind and current effect; and SPAR system, for realistic visual effects and environmental conditions representation to enhance the visual perception and phenomenon understanding. It will be presented a real case usage of the system in the project of new floating platform with wave, wind and terrain data of the Campos Basin (Brazilian biggest reservoir). The real-time simulation of floating systems is not new, but until today only scientific aspects were considered besides visual appeal. The association of artistic elements only used on movies and games are introduced in real engineering simulation creating a new way of understanding and interacting with this scientific data.

A Study on Mooring Systems of an Offshore Floating Platform for Different Configurations

2014 ◽  
Vol 567 ◽  
pp. 197-203
Author(s):  
Anurag Yenduri ◽  
Montasir Osman Ahmed ◽  
V. John Kurian
Keyword(s):  
Static Analysis ◽  
Experimental Tests ◽  
Mooring System ◽  
Preliminary Design ◽  
Floating Platform ◽  
Mooring Lines ◽  
Matlab Code ◽  
Restoring Forces ◽  
Floating Platforms

Moored systemsof floating platforms typically have mooring lines in groups,attached to hull of the platform in different configurations.Study on therestoring behaviour of these systemsfor variousparameters of mooring lines gives an insight to decide on the preliminary design of platforms.This paper includesparametric study on the behaviour of mooring systems for various symmetric, asymmetric configurations of the lines. To compute the restoring forces of the mooring system,quasi-static analysis has been adopted and a MATLAB code named QSAML has been developed, validated with experimental tests and used for the parametric study.It has been observed that, the restoring capability of mooring system reduces whenthe lines are placed away from the wave heading.For any wave heading, the variation in restoring behaviour of mooring system with symmetric configurations is insignificant up to relatively small excursions of the platform.

Installation of a Submerged Buoy for Supporting Risers (BSR) System in Campos Basin Site

2011 ◽  
Author(s):  
Jairo Bastos de Arau´jo ◽  
Jose´ Carlos Lima de Almeida ◽  
Antonio Carlos Fernandes
Keyword(s):  
Numerical Analysis ◽  
Model Test ◽  
Water Depth ◽  
Water Model ◽  
Floating Platform ◽  
Mooring Lines ◽  
Sea Bottom ◽  
Campos Basin ◽  
Steel Catenary Risers ◽  
Field Location

The BSR (Buoy for Supporting Risers) concept is composed by a submerged buoy anchored to the sea bottom by tethers and intended to support risers coming from the bottom (probably SCRs — Steel Catenary Risers) and going to the floating platform (probably with flexible jumpers). For the case under analysis here, the main dimensions of the BSR prototype are 27.2 m length × 27.2 m width × 5.0 m depth. The paper describes all final full scale installation step so that the BSR may be considered a suitable technology. The installation indeed was the great challenge of this design due the size of the hull. The present work also evaluates numerically and experimentally a specific new manner to install the BSR with the support of auxiliary mooring lines among with the four tethers connected to it. One of the installation premises was to make use of Anchor Handling Supply Vessels instead of Crane Vessels. After this numerical analysis, the work went on by performing model tests that simulates the operation in a deep water model basin using 1:40 scale. The model test anticipated several problems such as the chain stopper weakness in the operation and others as discussed in this paper. As a conclusion the work was devised the most important parameters during the system installation and suggested ways to improve the methodology. In November 2009 the BSR was installed in 500 m of water depth at Congro field location, Campos Basin, offshore Brazil. The tethers were adjusted in January 2010 and in March 2010 two risers were installed. Thenceforward the last edge of this knowledge was considered over passed.

Flexible Riser Fatigue Procedure Using a Long Term Distribution of FPSO’s Heading Direction

2002 ◽  
Author(s):  
Carlos Alberto Duarte de Lemos ◽  
Murilo Augusto Vaz
Keyword(s):  
Environmental Conditions ◽  
Environmental Data ◽  
Mooring Lines ◽  
Fatigue Design ◽  
Beam Seas ◽  
Heading Direction ◽  
Campos Basin ◽  
Directional Waves ◽  
Flexible Risers

The intensive use of FPSOs in Campos Basin, offshore Brazil, has demanded more attention on the fatigue design of flexible risers. Field experience and a new set of environmental data collected in the last years have shown a large number of swell waves reaching the floating units in quartering and beam seas, which has amplified the motions at the risers’ top connections. Hence, it is necessary to evaluate the occurrence probability of wave heading direction relative to the vessel, especially for beam seas, but also noting the probability increase of quartering seas considering the existence of bi-modal and bi-directional wave spectra. The simultaneous environmental conditions — wind, current and bi-directional waves (sea and swell) — registered in Campos Basin, were condensed in a few hundreds environmental conditions to enable its utilization on a simulation program, where the FPSO, mooring lines and risers were modeled to obtain the mean heading and offsets. This new set of FPSO headings were then used to define a new proposal of load conditions to evaluate the fatigue life of flexible risers. This new procedure was then applied to a case study for the FPSO P-33 employing the tools available at PETROBRAS research center. The results have confirmed the importance of beam and quarter seas, which respectively cause heavy roll and vertical motions at the turret and then, affecting the fatigue of the risers.

Simulation and the design building block approach in the design of ships and other complex systems

2006 ◽  
Vol 462 (2075) ◽  
pp. 3407-3433 ◽  
Author(s):  
D.J Andrews
Keyword(s):  
Complex Systems ◽  
Building Block ◽  
Large Scale ◽  
Integrated Design ◽  
Ship Design ◽  
Research Centre ◽  
Design System ◽  
Initial Design ◽  
Scale Design ◽  
Block Approach

This paper is in many respects a continuation of the earlier paper by the author published in Proc. R. Soc. A in 1998 entitled ‘A comprehensive methodology for the design of ships (and other complex systems)’. The earlier paper described the approach to the initial design of ships developed by the author during some 35 years of design practice, including two previous secondments to teach ship design at UCL. The present paper not only takes that development forward, it also explains how the research tool demonstrating the author's approach to initial ship design has now been incorporated in an industry based design system to provide a working graphically and numerically integrated design system. This achievement is exemplified by a series of practical design investigations, undertaken by the UCL Design Research Centre led by the author, which were mainly undertaken for industry clients in order to investigate real problems to which the approach has brought significant insights. The other new strand in the present paper is the emphasis on the human factors or large scale ergonomics dimension, vital to complex and large scale design products but rarely hitherto been given sufficient prominence in the crucial formative stages of large scale design because of the inherent difficulties in doing so. The UCL Design Building Block approach has now been incorporated in the established PARAMARINE ship design system through a module entitled SURFCON. Work is now underway on an Engineering and Physical Sciences Research Council joint project with the University of Greenwich to interface the latter's escape simulation tool maritimeEXODUS with SURFCON to provide initial design guidance to ship designers on personnel movement. The paper's concluding section considers the wider applicability of the integration of simulation during initial design with the graphically driven synthesis to other complex and large scale design tasks. The paper concludes by suggesting how such an approach to complex design can contribute to the teaching of designers and, moreover, how this design approach can enable a creative qualitative approach to engineering design to be sustained despite the risk that advances in computer based methods might encourage emphasis being accorded to solely to quantitative analysis.

The Boeing 787 Dreamliner--A case study in large-scale design integration

2008 ◽  
Author(s):  
D. L. McMullin ◽  
A. R. Jacobsen ◽  
D. C. Carvan ◽  
R. J. Gardner ◽  
J. A. Goegan ◽  
...  
Keyword(s):  
Large Scale ◽  
Design Integration ◽  
Scale Design

scholarly journals Transient Responses Evaluation of FPSO with Different Failure Scenarios of Mooring Lines

2021 ◽  
Vol 9 (2) ◽  
pp. 103
Author(s):  
Dongsheng Qiao ◽  
Binbin Li ◽  
Jun Yan ◽  
Yu Qin ◽  
Haizhi Liang ◽  
...  
Keyword(s):  
Service Condition ◽  
Mooring Line ◽  
Mooring System ◽  
Transient Effects ◽  
Floating Platform ◽  
Transient Responses ◽  
Mooring Lines ◽  
Performance Deterioration ◽  
Steady State Responses ◽  
Influence Process

During the long-term service condition, the mooring line of the deep-water floating platform may fail due to various reasons, such as overloading caused by an accidental condition or performance deterioration. Therefore, the safety performance under the transient responses process should be evaluated in advance, during the design phase. A series of time-domain numerical simulations for evaluating the performance changes of a Floating Production Storage and Offloading (FPSO) with different broken modes of mooring lines was carried out. The broken conditions include the single mooring line or two mooring lines failure under ipsilateral, opposite, and adjacent sides. The resulting transient and following steady-state responses of the vessel and the mooring line tensions were analyzed, and the corresponding influence mechanism was investigated. The accidental failure of a single or two mooring lines changes the watch circle of the vessel and the tension redistribution of the remaining mooring lines. The results indicated that the failure of mooring lines mainly influences the responses of sway, surge, and yaw, and the change rule is closely related to the stiffness and symmetry of the mooring system. The simulation results could give a profound understanding of the transient-effects influence process of mooring line failure, and the suggestions are given to account for the transient effects in the design of the mooring system.

A Fundamental Study on Motion Characteristics of the Large-Scale Floating Coal Transshipment Station by Elastic Mooring Lines

2021 ◽  
Author(s):  
Hiroaki Eto ◽  
Ryo Sekiguchi ◽  
Hitomi Kashima ◽  
Tomoki Ikoma ◽  
Yasuhiro Aida ◽  
...  
Keyword(s):  
Large Scale ◽  
Mooring Lines ◽  
Fundamental Study ◽  
Motion Characteristics
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