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THE APPLICATION OF APPROXIMATE REASONING METHODOLOGIES TO OFFSHORE ENGINEERING DESIGN BASED ON RISK ASSESSMENT

机译:近似推理方法在基于风险评估的海上工程设计中的应用

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摘要

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.
机译:在处理离岸应用程序的复杂且定义不明确的系统时,为进行风险评估而对人的推理进行建模需要有效的基于逻辑的系统方法。例如,浮动生产,存储和卸货(FPSO)装置将传统工艺技术与船舶技术结合在一起,因此非常依赖技术设计和操作安全控制。这种对安全至关重要的依赖关系需要新颖的方法来正确分析所涉及的风险。因此,提供了一种采用近似推理和证据推理方法的拟议框架,用于对评估任务进行建模。基于模糊集理论,该模型可以对不确定性进行数学描述,并在结构分析中进行进一步处理。介绍了可用于表示模糊语言变量以量化风险级别的隶属函数形式。本文以串联卸载过程中技术故障引起的FPSO与穿梭油轮之间的碰撞风险为例,说明了该模型的应用。此外,从案例研究中获得的结果可以证实,在海上工程系统设计过程的各个阶段,合并近似推理的框架是获得可靠风险分析的合适且方便的工具。

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