The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Office - One of the best experts on this subject based on the ideXlab platform.
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UWA Handbook, Unit Information for Introduction to Offshore Engineering (OGEG5802)
2013Co-Authors: OfficeAbstract:Unit information for Introduction to Offshore Engineering (OGEG5802), a unit offered by the University of Western Australia.
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UWA Handbook, Unit Information for Coastal and Offshore Engineering (GENG5501)
2012Co-Authors: OfficeAbstract:Unit information for Coastal and Offshore Engineering (GENG5501), a unit offered by the University of Western Australia.
Jin Wang - One of the best experts on this subject based on the ideXlab platform.
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use of fuzzy risk assessment in fmea of Offshore Engineering systems
Ocean Engineering, 2015Co-Authors: Zaili Yang, Jin WangAbstract:This paper proposes a novel framework for analysing and synthesising Engineering system risks on the basis of a generic Fuzzy Evidential Reasoning (FER) approach. The approach is developed to simplify the inference process and overcome the problems of traditional fuzzy rule based methods in risk analysis and decision making. The framework, together with the FER approach has been applied to model the safety of an Offshore Engineering system. The benchmarking between the new model and a well-established Rule based Inference Methodology using the Evidential Reasoning (RIMER) is conducted to demonstrate its reliability and unique characteristics. It will facilitate subjective risk assessment in different Engineering systems where historical failure data is not available in their safety practice.
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The Application of Approximate Reasoning Methodologies to Offshore Engineering Design Based on Risk Assessment
Volume!, 2004Co-Authors: A. G. Eleye-datubo, Jin Wang, H. S. Sii, J. B. Yang, J. LiuAbstract:In dealing with complex and ill-defined systems of an Offshore application, modelling of human reasoning for the purpose of risk assessment requires the effectiveness of a systematic logic-based approach. Floating production, storage and offloading (FPSO) installations, for example, combine traditional process technology with marine technology, and thus are quite dependent on technical design and operational safety control. Such safety-critical dependencies require novel approaches to properly analyse the risk involved. Hence, a proposed framework utilising approximate reasoning and evidential reasoning approaches is provided for modelling the assessment task. As based on fuzzy set theory, the model enables uncertainties to be described mathematically and further processed in the analysis of the structures. The forms of membership functions that could be used in representing fuzzy linguistic variables to quantify risk levels are presented. A case study of collision risk between FPSO and shuttle tanker due to technical failure during tandem offloading operation is used in this paper to illustrate the application of the proposed model. Furthermore, the obtained results from the case study provide confirmation that at various stages of Offshore Engineering systems design process the framework of incorporated approximate reasoning is a suited and convenient tool for attaining reliable risk analysis.© 2004 ASME
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A review of design for safety methodology for large marine and Offshore Engineering systems
Proceedings of the Institution of Mechanical Engineers Part E: Journal of Process Mechanical Engineering, 1998Co-Authors: Jin WangAbstract:AbstractThis paper deals with problems involving the incorporation of safety into the design process of large marine and Offshore Engineering products from the initial stages. In this paper, the characteristics of large marine and Offshore products are described and their design process is studied together with a proposed design framework. After investigating the current design for safety status of large marine and Offshore products, a design for safety methodology is proposed in a generic sense and discussed in the context of the design process. The phases in the proposed design for safety methodology are studied together with their objectives and requirements. Finally, concluding remarks are given.
Chengjia Shang - One of the best experts on this subject based on the ideXlab platform.
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Combined effect of M/A constituent and grain boundary on the impact toughness of CGHAZ and ICCGHAZ of E550 grade Offshore Engineering steel
Mathematical Biosciences and Engineering, 2019Co-Authors: Xuelin Wang, Chengjia Shang, Zhi Quan Wang, Zhen Jia Xie, Xiao Ping, Sundaresa Subramanian, Jing Liang WangAbstract:The present paper investigated the relationship between low temperature impact toughness and microstructure of bainite in coarse-grained heat affected zone (CGHAZ) and intercritically rehazed CGHAZ (ICCGHAZ) of an Offshore Engineering steel from both the microstructure morphological and crystallographic aspects. In this work, six groups of samples simulated CGHAZ and ICCGHAZ were designated at three different cooling rates. The Charpy test results showed that the toughness in CGHAZ decreases dramatically with decrease of cooling rate, which was attributed to the microstructural evolution from lath bainite to granular bainite, accompanying with the size increase of Bain zone and the change of M/A morphology from film to block. The increase in hardenability by cooling rate promotes more crystallographic variants from different Bain groups. Meanwhile, the combination with controlled inter-spacing of block boundaries by self-accommodation below the critical Griffith crack length, micro-crack can be arrested by these high angle grain boundaries thereby suppressed brittle fracture initiation and increased fracture properties. However, the variation in toughness of ICCGHAZ is not a concern, since obtaining excellent toughness is scarcely accessible even if the matrix microstructure is analogous to CGHAZ. It was due to the formation of coarse M/A constituents (~2 μm) necklacing at the prior austenite grain boundary. The visualized crystallography suggested that the impact toughness was partially correlated to the configuration manner and the size of Bain zones as well via promoting highly misoriented angle (>45°) boundaries, which in turn effectively deflected or arrested the brittle crack propagation.
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Analysis of impact toughness scatter in simulated coarse-grained HAZ of E550 grade Offshore Engineering steel from the aspect of crystallographic structure
Materials Characterization, 2018Co-Authors: Xuemin Wang, Z. Q. Wang, Z.j. Xie, S.v. Subramanian, Chengjia ShangAbstract:Abstract This study aims at providing a new insights into the impact toughness scatter from the aspect of crystallographic structure. It demonstrated that the large impact toughness scatter associated much to the microstructure diversity. The crystallographic structure with evident scatter will display obvious discrepancy. In this work, three groups of samples simulated coarse-grained heat affected zone (CGHAZ) of an Offshore Engineering steel were obtained at different cooling rates. The Charpy test results showed that the toughness decreases dramatically with the decrease of cooling rate. However, the largest scatter in impact toughness occurred in the sample with medium cooling rate (15 °C/s), which was attributed to the heterogeneity in crystallographic structures. The visualization of crystallographic features showed that the prior austenite grain size has a significant effect on bainitic variant selection, which governed the effective grain size and crack propagation mechanism. CP (close-packed plane) grouping of variants is more likely to take place in large austenite grain, indicating that the size of CP region is larger than Bain zone, and the crack is short and flexural. On the contrary, in smaller austenite grain, Bain grouping of variants that always forms low angle grain boundary and favors crack propagation dominates the transformation, and it will promote the crack to propagate through the entire Bain zone and then yield large long crack. However, these two cases can co-exist in the same sample at medium cooling rate, indicating that the cleavage fracture is controlled by the effective grain size (Bain-zone size) and the scatter in impact toughness is associated much to the proportion and relative location between fine and coarse Bain zones.
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Influence of welding pass on microstructure and toughness in the reheated zone of multi-pass weld metal of 550 MPa Offshore Engineering steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: X. L. Wang, Y. T. Tsai, J. R. Yang, Y.r. Nan, Z.j. Xie, Chengjia ShangAbstract:Abstract The objective of this paper is to study the influence of thermal cycles produced by the later welding passes on the properties of the sub-regions in reheated zone of multi-pass weld metal for a 550 MPa grade Offshore Engineering steel. A Gleeble-3500 simulator was applied to simulate microstructural evolution in sub-regions of the reheated zone and its effect on the properties. The results indicated that the reheating process changed the prior austenitic morphology from columnar structure to equiaxed structure and similar columnar structure with quasi-polygonal ferrite (QPF) or blocky M-A (martensite/austenite) constituent distributed on the grain boundaries while the matrix microstructure (acicular ferrite) changed slightly. Charpy impact results indicated that WM region (as-deposited) had the highest impact energy. However, the actual impact sample showed lower impact energy because the machined notch contained one or more brittle reheated zones. In these brittle reheated zones, the necklace-type M-A constituent was hard phase decorating prior columnar or equiaxed austenite grain boundaries, which yielded stress concentration significantly and was mainly responsible for lower toughness of the entire weld metal. Fortunately, this deterioration in toughness could be reduced as decomposition of necklace-type M-A constituent occurred due to later welding passes.
Amir M. Kaynia - One of the best experts on this subject based on the ideXlab platform.
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Seismic response of monopiles to vertical excitation in Offshore Engineering
Ocean Engineering, 2020Co-Authors: Amir M. Kaynia, Jisheng Zhang, Weiyun ChenAbstract:Abstract This paper studies the dynamic response of a large diameter and thin-walled monopile, embedded in a partially saturated porous seabed with saturation degrees larger than 95%, under a seawater layer, subjected to vertically incident P wave excitations. The ground is a semi-infinite homogenous half-space with a horizontal surface. The solution of the coupled water-pile-soil vibration problem is constructed using a rigorous semi-analytical method. By considering the coupled boundary conditions at the pile-soil and water-soil interfaces, the earthquake induced response is reduced to integral equations and solved numerically. Results for the free field soil displacement and kinematic interaction factor are obtained, which are different from the results reported in the literature for onshore earthquake Engineering applications as these do not have the effects of the water layer and the vibration induced dynamic water pressures. The existence of a water layer will always decrease the vertical response of the seabed, but may amplify the monopile's displacement near some resonant frequencies, compared to the case of no water. These results are useful in understanding the kinematic interaction of soil and monopile in Offshore Engineering applications.
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Earthquake Geotechnics in Offshore Engineering
Recent Advances in Earthquake Engineering in Europe, 2018Co-Authors: Amir M. KayniaAbstract:This paper presents a number of geotechnical issues encountered in earthquake design of Offshore structures and subsea facilities. Parallel with construction of traditional structures such as jackets and gravity-based structures, a considerable effort has recently been put to field developments in deep water. This has brought about other challenges that are largely dependent on geotechnical knowledge. This paper addresses some of the more recent approaches and solutions in geotechnical earthquake design of both shallow water and deep-water structures and facilities such as platforms with large bases, pipelines traversing slopes and seabed installations. It is demonstrated how incorporation of radiation damping and nonlinear soil-structure interaction in Offshore installations could optimize the design. Considering the importance of earthquake stability of slopes in deep water development, special attention is given to highlighting several key issues in the earthquake response of submarine slopes including strain softening and three-dimensional shaking.
Ismael Santos - One of the best experts on this subject based on the ideXlab platform.
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SVR - EnvironRC: Integrating Mobile Communication and Collaboration to Offshore Engineering Virtual Reality Applications
2016 XVIII Symposium on Virtual and Augmented Reality (SVR), 2016Co-Authors: Bernardo F. V. Pedras, Alberto Raposo, Ismael SantosAbstract:Offshore Engineering visualization applications are, in most cases, very complex and should display a lot of data coming from very computational intensive numerical simulations. To help analyze and better visualize the results, 3D visualization can be used in conjunction with a VR environment. The main idea for this work began as we realized two different demands that Engineering applications had when running on VR setups: firstly, a demand for visualization support in the form of better navigation and better data analysis capabilities. Secondly, a demand for collaboration, due to the difficulties of coordinating a team with one member using VR. To meet these demands, we developed a Service Oriented Architecture (SOA) capable of adding external communications to any application. Using the added communications, we built an external collaboration layer. We study the architecture of our solution and how it could be implemented for any application. Furthermore, we study the impact of our solution when running an Offshore Engineering application on VR setups with the support of mobile devices. Such devices can be used to help navigate the virtual world or be used as a second screen, helping visualize and manipulate large sets of data in the form of tables or graphs. As our test application, we used Environ, which is a VR application for visualization of 3D models and simulations.
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a collaborative vr visualization environment for Offshore Engineering projects
Virtual Reality Continuum and its Applications in Industry, 2011Co-Authors: Ismael Santos, Luciano Soares, Felipe Carvalho, Alberto RaposoAbstract:The current way of designing industrial plants relies on the communication among experts in the field, and on tools that allow the simulation of the site. Virtual reality (VR) tools are used to visualize and interact with complex 3D environments in real time, and several Engineering simulations employ VR to foresee the results of complex industrial operations. The research project described here presents a collaborative Engineering environment (CEE) that integrates VR techniques into a system where the execution of different sequences of Engineering simulations is modeled as scientific workflows. The focus of this research is on the oil & gas industry, particularly Offshore Engineering, where the project of a new production unit is a lengthy and expensive process and usually is conducted by different specialists who are geographically distributed. Among the integrated Engineering simulations are those involving structural calculus, hydrodynamics, naval Engineering with mooring systems, meteo-oceanography, and others. The main objective is to improve the users' interpretation capacity and skills while providing visualization tools for a better understanding of the results.
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VRCAI - A collaborative VR visualization environment for Offshore Engineering projects
Proceedings of the 10th International Conference on Virtual Reality Continuum and Its Applications in Industry - VRCAI '11, 2011Co-Authors: Ismael Santos, Felipe Carvalho, Luciano P. Soares, Alberto RaposoAbstract:The current way of designing industrial plants relies on the communication among experts in the field, and on tools that allow the simulation of the site. Virtual reality (VR) tools are used to visualize and interact with complex 3D environments in real time, and several Engineering simulations employ VR to foresee the results of complex industrial operations. The research project described here presents a collaborative Engineering environment (CEE) that integrates VR techniques into a system where the execution of different sequences of Engineering simulations is modeled as scientific workflows. The focus of this research is on the oil & gas industry, particularly Offshore Engineering, where the project of a new production unit is a lengthy and expensive process and usually is conducted by different specialists who are geographically distributed. Among the integrated Engineering simulations are those involving structural calculus, hydrodynamics, naval Engineering with mooring systems, meteo-oceanography, and others. The main objective is to improve the users' interpretation capacity and skills while providing visualization tools for a better understanding of the results.
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CRIWG - A collaborative environment for Offshore Engineering simulations
Lecture Notes in Computer Science, 2011Co-Authors: Ismael Santos, Alberto Raposo, Paulo Gallotti Rodrigues, Rogério Pinheiro De Souza, Wagner Gomes Do AmaralAbstract:The main objective of this article is to find effective solutions for collaboration of team workers during the execution of Large Scale Engineering Projects (LSEP). The research is based on actual operational needs of Petrobras, a large Brazilian governmental oil & gas company. For this article we have focused on Offshore Engineering Projects as our case study. We have implemented a Service Oriented Architecture aimed to create a collaborative environment, called CEE (Collaborative Engineering Environment), for visualizing Engineering simulations considering important requirements identified for LSEPs, such as collaboration, workflow coordination, and immersive visualization. CEE allows team workers to concentrate in the task of solving a problem using seamlessly the computational resources available, from the execution of Engineering simulations on a Grid to the collaborative visualization of results in an immersive or desktop environment.
