Reliability Simulation for Offshore Structures Based on Fault Tree Analysis

2018 ◽  
Author(s):  
Yongjin Guo ◽  
Hongdong Wang ◽  
Hong Yi
Keyword(s):  
Large Scale ◽  
Failure Time ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Simulation Method ◽  
Offshore Structures ◽  
Offshore Platforms ◽  
Repairable Systems ◽  
Electrical Power System ◽  
Tree Analysis

Offshore structures are large-scale and multifunctional products with high requirements for reliability. In this paper, the reliability simulation method based on fault tree analysis for offshore structures is studied. For non-repairable systems, the Weibull distribution is used to fit the failure distribution function of the bottom events of fault trees. The Monte Carlo method is used to sample the lifetime of bottom events, and the unreliability of the top event is calculated through the structure function of the fault tree. For repairable systems, the time arrays of state changes are generated through sampling failure and maintenance time of the components. The system failure time of each simulation is calculated based on minimal cut sets of the fault tree. The method is applied in the reliability analysis of the electrical power system of offshore platforms to prove its feasibility and effectiveness.

Collision Risk Modelling of Supply Vessels and Offshore Platforms Under Uncertainty

2017 ◽  
Vol 70 (4) ◽  
pp. 870-886 ◽  
Author(s):  
Andrew John ◽  
Umukoro Johnson Osue
Keyword(s):  
Complex Structure ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Safety Evaluation ◽  
Offshore Platforms ◽  
Tree Analysis ◽  
Failure Data ◽  
Analysis Process ◽  
Management Procedures ◽  
Offshore Industry

Serious accidents in the marine and offshore industry have underscored the need for safety evaluation of maritime operations using risk and safety analysis methods which have become a powerful tool in identifying technical solutions and operational management procedures. Given that Fault Tree Analysis (FTA) is a known methodology used for analysing engineering systems, the approach is usually conducted using known failure data. But most offshore operations are conducted in a challenging and uncertain environment and the failure data of some of these systems are usually unavailable requiring a flexible and yet robust algorithm for their analysis. This paper therefore seeks to analyse the complex structure of Offshore Supply Vessel (OSV) collision with platforms by incorporating a Fuzzy Fault Tree Analysis (FFTA) method. Fuzzy set theory provides the flexibility to represent vague information from the analysis process. The methodology is structured in such a manner that diverse sets of data are integrated and synthesized for analysing the system. It is envisaged that the proposed method could provide the analyst with a framework to evaluate the risks of collision enabling informed decisions regarding the deployments of resources for system improvement.

Research of Fault Detection System Combining with Fault Tree Analysis with Artificial Neural Network in Large Scale Die-Forging Press

2011 ◽  
Vol 317-319 ◽  
pp. 661-666 ◽  
Author(s):  
Ji Dong Yang ◽  
Yan Zhang
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Fault Detection ◽  
Network Model ◽  
Large Scale ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Tree Analysis ◽  
Artificial Neural ◽  
Forging Press

This paper research on a new fault detection method used in large scale die-forging press, based on the national major science and technology project (2009ZX04005-011). This method combines fault tree analysis (FTA) with artificial neural network (ANN), it need to pick up training samples of ANN from fault tree constructing by analyzing system first. An effective network model can be achieved through using BP algorithm to train the samples based on the tree-layer feed-forward network structure. This network model can output fault reasons according to fault symptoms.

Reliability Research of Fiber-Access Devices Monitoring System on Fault Tree

2013 ◽  
Vol 760-762 ◽  
pp. 1317-1321
Author(s):  
Qi Gui Yao ◽  
Hai Yu ◽  
Yue Yu ◽  
Wei Wang
Keyword(s):  
Monitoring System ◽  
System Reliability ◽  
Theoretical Basis ◽  
Large Scale ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Tree Analysis ◽  
Tree Modeling ◽  
System Improvement ◽  
Important System

The method of fault tree analysis is an important method for complex system reliability analysis of large scale. Fiber-access devices monitoring system is an important system of electric power communication transmission. Firstly it introduces the method of fault tree analysis, and then use the fault tree modeling technique for the fault tree to model refers to the fault of optical access equipment monitoring system, and carries on the qualitative analysis and quantitative analysis. It provides theoretical basis for system improvement and maintenancs.

Fault-Tree Analysis for Power Gird Emergency Logistics System under Large-Scale Natural Disaster

2014 ◽  
Vol 986-987 ◽  
pp. 311-314
Author(s):  
Feng Yu ◽  
Xiang Yang Li ◽  
Guo Jun Yue
Keyword(s):  
Natural Disaster ◽  
Large Scale ◽  
Risk Estimation ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Critical Infrastructures ◽  
Logistics System ◽  
Tree Analysis ◽  
Emergency Logistics ◽  
Vital Component

Power grid, one of the critical infrastructures, is a vital component of the world’s energy supply. Once large-scale natural disaster occurs, it is inevitable to meet unexpected faults on emergency logistic. Fault-tree analysis (FTA) is a risk estimation tool to describe and model causal interactions and logical relationships between undesired events in a system Taking uncertain situation and response failure into consideration, this paper proposed a fault-tree analysis on PG-ELS with fuzzy probabilistic confidence. The most critical failure mode is identified using the ranking method based on interval number.

Improve System Reliability and Robustness Using Axiomatic Design and Fault Tree Analysis

2014 ◽  
Author(s):  
Jing Wang ◽  
Mian Li
Keyword(s):  
Complex System ◽  
System Reliability ◽  
Theoretical Calculations ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Axiomatic Design ◽  
Repairable Systems ◽  
Tree Analysis ◽  
Reliability And Robustness ◽  
Physical Components

The reliability and robustness are critical aspects for engineering systems. In a complex system, usually multiple functions need to be achieved. In such cases, there exist optimal mappings between functions and physical components. In this paper, a new approach, Axiomatic Fault Tree Analysis (AFTA), is proposed to improve the system reliability and robustness simultaneously. In AFTA, system robustness is improved by using Axiomatic Design (AD) to decouple the system to an extent where a group of functions have a corresponding relationship with only one physical component. Moreover, Fault Tree Analysis and Axiomatic Design have been integrated in AFTA by using two new indices indicating the importance degrees of functions and physical components in a reliability sense, which provides a guideline for reliability improvement. A case study of a complex system is used to illustrate the procedure and applicability of AFTA. Theoretical calculations are used to verify AFTA for non-repairable systems, and multi-agent based simulations are for repairable systems. Both the theoretical and simulated results show that the system reliability has been improved significantly without large additional cost.

scholarly journals Fault tree analysis of large-scale blackout accidents

2019 ◽  
Vol 118 ◽  
pp. 01049
Author(s):  
Dong Fu ◽  
Song Gao ◽  
Zhenhong Yan ◽  
Hongye Wu ◽  
Xiaohu Xu ◽  
...  
Keyword(s):  
Theoretical Basis ◽  
Large Scale ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Analysis Method ◽  
Tree Analysis ◽  
Minimum Path ◽  
Structural Importance

Fault tree analysis method is used to analyze the large-scale blackout accidents. Minimum cut sets and minimum path sets of large-scale blackout accidents are calculated, and the structural importance degree of the accidents is analyzed according to the minimum path sets. Direct factors that cause large-scale blackout accidents are determined. Effective measures are put forward to prevent large-scale blackouts, and the theoretical basis is put forward to prevent large-scale blackouts.

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