FPSO Conceptual Design System Tools Considering Hurricane Data Base and Production Requirements

2007 ◽  
Author(s):  
Alberto Omar Vazquez-Hernandez
Keyword(s):  
Gulf Of Mexico ◽  
Data Base ◽  
Conceptual Design ◽  
Environmental Conditions ◽  
Production System ◽  
Wave Force ◽  
Design Stage ◽  
Design System ◽  
Site Conditions ◽  
Mooring System

The conceptual design is an important stage of the engineering process of any floating production system. This design stage takes into account the specific site conditions and production requirements to find a feasible technical alternative of the system characteristics, from which in the next engineering stage the structure is improved. Among the basic characteristics of a floating production system are the hull main dimensions, which have to meet the production and stability requirements, as well as the mooring system characteristic. The mooring system definition mainly depends on the water depth, hull dimensions and the environmental site conditions. The environmental conditions are different from site to site, where in some sites around the world harsh conditions like hurricanes or typhoons may occur. Therefore, in the dimensioning of the mooring system such environmental conditions have to be considered. In the case of Gulf of Mexico, hurricane conditiones have presented a risk to the oil and gas existing facilities as it is evident on the severe damages and failures they have provoked in some cases. The present study aims to consider a computational tool that takes into account in the conceptual design stage a data base of hurricane conditions in Gulf of Mexico, as well as the production and site requirements so that to carry out the basic sizing of hull and mooring systems. The tool also considers a data base considering different hull sizes (wave force coefficients) and mooring materials to estimate the environmental loads and the mooring system design.

scholarly journals Implementation of Component-based Simulation Support Tool for Conceptual Design

10.14311/504 ◽  
2004 ◽  
Vol 44 (1) ◽  
Author(s):  
T. Brandejský
Keyword(s):  
Conceptual Design ◽  
Design Stage ◽  
Design System ◽  
Algebraic Equations ◽  
Support Tool ◽  
Simulation Tools ◽  
Lack Of Information ◽  
Classical Simulation ◽  
Uncertainty Representation ◽  
Simulation Task

Presented paper speaks about the problem of conceptual design stage simulation support. Simulation support is a very useful part of conceptual design system due to capability to verify ideas in early design stages. The problem excluding classical simulation tools is lack of information about designed device, is inconsistency and uncertainty. Thus specialised tool must be developed. The component-oriented editor of component descriptions and models is presented. This tool enables to describe components not only in terms of algebraic equations, but also by fuzzy rules. The problem of dynamic work with uncertainty representation during simulation and design processes is also solved. Presented tool also differentiates from standard tools like Mathematica or Matlab in its ability to work with component-based models, where each component is described from many aspects and only few of them are valid in concrete use. The tool must be able to select relations relevant in concrete simulation task and omit the rest. 

Experimental Evaluation of VIM on MPSO in Combined Environmental Conditions for Waves and Current

2012 ◽  
Author(s):  
Masakatsu Saito ◽  
Sotaro Masanobu ◽  
Tomoki Taniguchi ◽  
Kazuhisa Otsubo ◽  
Takayuki Asanuma ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Environmental Conditions ◽  
High Performance ◽  
Evaluation Method ◽  
Wind Waves ◽  
Estimation Method ◽  
Safety Evaluation ◽  
Development Project ◽  
Mooring System ◽  
Loop Current

MPSO, mono-column hull type FPSO, is attracting the interest as a floating production system which has high performance for motion and large tank capacity in recent years. The authors had performed a mooring system safety evaluation of a MPSO named ‘MONOBR’ which was assumed to be installed at the Gulf of Mexico in the international collaborative research and development project between PETROBRAS and JOGMEC. There exists a strong current called the Loop current in the Gulf of Mexico. It is known that cylindrical floaters like SPARs or MPSOs sway with the long period and large amplitude in the transverse direction of the current. The motion is called Vortex Induced Motion (VIM), and is caused by vortex shedding from the sidewall of the floater. VIM is one of the important issues in the safety evaluation of mooring system of MPSO. Generally, the combined environmental conditions in which wind, waves and current exist are concerned for the safety evaluation of mooring systems. Therefore, it needs to estimate VIM in waves and current. The authors had performed the VIM measurement tests in order to investigate the estimation method of VIM in waves and current. The results of the VIM measurement test in waves and current and the results of the mooring safety evaluation method using the estimation method of VIM in waves and current are described in this paper.

Conceptual Process Planning: A Definition and Functional Decomposition

1999 ◽  
Author(s):  
Shaw C. Feng ◽  
Y. Zhang
Keyword(s):  
Conceptual Design ◽  
Process Planning ◽  
Development Stage ◽  
Design Stage ◽  
Design System ◽  
Prototype System ◽  
Manufacturing Cost ◽  
Activity Model ◽  
Early Design Stage ◽  
Definition Of

Abstract Conceptual process planning is an activity for designers to evaluate manufacturability and the manufacturing cost in the early design stage for mechanical parts production. Since major manufacturing costs of a product are committed in product specification and design, it is critical to be able to assess manufacturability and cost as early as possible in the design process. At the National Institute of Standards and Technology, the Design and Process Planning Integration (DPPI) project addresses the need for improving communication between conceptual design and conceptual process planning activities. Documenting the DPPI foundation, this paper provides a definition of conceptual process planning and describes its functions in an activity model. Also, this paper describes the conceptual process planning prototype system that has been implemented and integrated with a conceptual design system. The prototype system validates the definition, the activity model, and the integration between process planning and design in the early product development stage.

Multi-Objective Design Problem of Tire Wear and Visualization of Its Pareto Solutions2

2006 ◽  
Vol 34 (3) ◽  
pp. 170-194 ◽  
Author(s):  
M. Koishi ◽  
Z. Shida
Keyword(s):  
Inverse Problems ◽  
Conceptual Design ◽  
Dimensional Space ◽  
Design Stage ◽  
Objective Functions ◽  
Pareto Solutions ◽  
Design Problems ◽  
Multi Objective ◽  
Design Engineers ◽  
Design Variables

Abstract Since tires carry out many functions and many of them have tradeoffs, it is important to find the combination of design variables that satisfy well-balanced performance in conceptual design stage. To find a good design of tires is to solve the multi-objective design problems, i.e., inverse problems. However, due to the lack of suitable solution techniques, such problems are converted into a single-objective optimization problem before being solved. Therefore, it is difficult to find the Pareto solutions of multi-objective design problems of tires. Recently, multi-objective evolutionary algorithms have become popular in many fields to find the Pareto solutions. In this paper, we propose a design procedure to solve multi-objective design problems as the comprehensive solver of inverse problems. At first, a multi-objective genetic algorithm (MOGA) is employed to find the Pareto solutions of tire performance, which are in multi-dimensional space of objective functions. Response surface method is also used to evaluate objective functions in the optimization process and can reduce CPU time dramatically. In addition, a self-organizing map (SOM) proposed by Kohonen is used to map Pareto solutions from high-dimensional objective space onto two-dimensional space. Using SOM, design engineers see easily the Pareto solutions of tire performance and can find suitable design plans. The SOM can be considered as an inverse function that defines the relation between Pareto solutions and design variables. To demonstrate the procedure, tire tread design is conducted. The objective of design is to improve uneven wear and wear life for both the front tire and the rear tire of a passenger car. Wear performance is evaluated by finite element analysis (FEA). Response surface is obtained by the design of experiments and FEA. Using both MOGA and SOM, we obtain a map of Pareto solutions. We can find suitable design plans that satisfy well-balanced performance on the map called “multi-performance map.” It helps tire design engineers to make their decision in conceptual design stage.

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