Fault Tree Analysis on Ship Dangerous Chemicals Leakage Emergency in Three Gorges Reservoir Area

2012 ◽  
Vol 610-613 ◽  
pp. 743-747
Author(s):  
Hai Yan Li ◽  
Guo Bin Wu
Keyword(s):  
Qualitative Analysis ◽  
Three Gorges Reservoir ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Three Gorges Reservoir Area ◽  
Minimum Cut ◽  
Three Gorges ◽  
Tree Analysis ◽  
Minimum Path ◽  
Cut Set

This paper conducts the fault tree analysis on Ship Dangerous Chemicals Leakage emergency of Three Gorges Lock with the method of safety system engineering, draws a map of fault tree analysis, representing intuitively the basic events which can bring about top events as well as the logic relationships between them, obtains the minimum cut set, minimum path set and structure importance through qualitative analysis of FTA, and points out the possible ways to prevent the occurrence of accidents.

Analysis on Dynamic Fault Tree Based on Fuzzy Set

2011 ◽  
Vol 110-116 ◽  
pp. 2416-2420 ◽  
Author(s):  
Li Ping Yang
Keyword(s):  
Fuzzy Set ◽  
Fault Tree ◽  
Dynamic Logic ◽  
Fault Tree Analysis ◽  
Logic Gates ◽  
Minimum Cut ◽  
Tree Analysis ◽  
Dynamic Fault Tree ◽  
Large Complex System ◽  
Cut Set

In case of fault tree analysis of large complex system, the probability of bottom event in dynamic fault tree is uncertain in some cases. To address the problem, the paper presented a dynamic fault tree analysis method based on fuzzy set computation. The method separates logic attributes and timing attributes of dynamic logic gates. It can convert dynamic fault tree into static fault tree not considering timing constraints and obtain minimum cut set of static fuzzy fault tree with set operations, then the concept of minimum cut set is extended to dynamical minimum cut sequence. Thus, the dynamic fault tree was analyzed in both qualitative and quantitative aspects, which solve the problem that it is difficult to assign value of event probability in previously process.

Identification and Control of Hazard in Underground Blasting

2014 ◽  
Vol 926-930 ◽  
pp. 4097-4100
Author(s):  
Dong Tao Hu
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Underground Blasting ◽  
Tree Analysis ◽  
Cut Set ◽  
And Control

To prevent underground blasting accidents, fault tree analysis (FTA), a method for identifying and evaluating hazard in safety theory, is used to throughly analyze underground blasting technology. With calculating the minimum cut set and path set, causes of blasting accidents are determined. And corresponding preventions are formulated.

Rapidly Analyze the Fault Tree with Numerical Methods

2014 ◽  
Vol 596 ◽  
pp. 209-215
Author(s):  
Bing Wu ◽  
Zi Hao Zhao ◽  
Yu Hui Ren
Keyword(s):  
Numerical Calculation ◽  
Numerical Methods ◽  
Qualitative Analysis ◽  
Prime Number ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
New Method ◽  
Minimum Cut ◽  
Tree Analysis

In order to take advantage of the computer in the numerical calculation, in view of the fault tree qualitative analysis, a new method of fault tree analysis, numerical methods, was proposed on the basis of absorbing merits of the prime number method and determinant method. The fault tree's minimum cut sets and path sets can be calculated effectively with this method. Consequently, a specific example about calculation of the minimum cut sets was demonstrated with Scilab in this paper.

Fault Tree Analysis of Centrifugal Compressor

2011 ◽  
Vol 474-476 ◽  
pp. 1587-1590
Author(s):  
Jin Fang Zhu
Keyword(s):  
Qualitative Analysis ◽  
Centrifugal Compressor ◽  
Failure Probability ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Tree Analysis ◽  
Rotary Machinery

Centrifugal compressor is one of the most typical equipment of all rotary machinery equipment, which is used widely and largely in petrochemical settings. Thus it is necessary to study the reliability of centrifugal compressor. The fault tree has been introduced and applied to the practical facilities. The reliability of centrifugal compressor also has been analyzed. Qualitative analysis aims to find the minimum cut and calculate the failure probability of compressors.

Condition Fault Tree: An Extension of Traditional Fault Tree to Handle Uncertainty

2018 ◽  
Author(s):  
Zhenxu Zhou ◽  
Qin Zhang
Keyword(s):  
Qualitative Analysis ◽  
System Reliability ◽  
Quantitative Method ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Analysis Method ◽  
Calculation Methods ◽  
Tree Analysis ◽  
Or Gate

Fault Tree Analysis (FTA) is a powerful and well-established tool, widely-used to evaluate system reliability. The logical connections between faults and causes in Fault Trees (FT) are assumed to be deterministic and are represented graphically via logical gates (such as AND gate, OR gate, NOT gate, etc.). However, sometimes the causalities can be uncertain. Considering that some of the causal relationships in FTs may be uncertain or non-deterministic, we propose a new model to represent the uncertainties, so called as Condition Fault Tree (CFT). We extend the traditional FTA by introducing a new parameter U, which illustrates the random mechanism of how parent event can cause child event. The probability of U (which is denoted by u = Pr{U}), is used to measure the uncertainty between parent event and child event. By introducing rules of parameter U in CFT, we explore its properties and corollaries. We also introduce a methodology to simplify CFTs based on Contraction, Elimination and Extraction rules. With the simplification rules, the structure of CFT can be simplified and the size of CFT can be significantly reduced. Since CFT is an extension of traditional FT, a qualitative analysis method and a quantitative method are introduced. For qualitative analysis, one can simplify a given CFT into the simplest form with the aforementioned rules, properties, and corollaries. With the simplest form of CFT, one can then get the Minimum Cut Sets with uncertainties, as an extension of Minimum Cut Sets. For quantitative analysis, exact calculation methods based on Inclusion-Exclusion and Disjoint-Sum-of-Product are proposed. Some examples are used to illustrate how CFT works.

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.

FTAe – Fault Tree Analysis in Microsoft Excel

2014 ◽  
Vol 889-890 ◽  
pp. 591-594
Author(s):  
Richard Kuracina ◽  
Denis Šandor ◽  
Karol Balog
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Software Tool ◽  
Short Description ◽  
Microsoft Excel ◽  
Tree Analysis ◽  
Minimal Cut Sets ◽  
Minimal Cut ◽  
Cut Set

FTAe is software tool for Fault Tree Analysis in Microsoft Excel. This paper is focused on short description of created FTAe. A brief description of Fault Tree Analysis is in the first part of paper. The Structure, Logic and Minimal Cut Sets in Fault Tree analysis is described too. Next part of this paper is focused on the choice of algorithm for cut set calculation and brief description of structure of FTAe. Finally, advantages of FTAe software in Microsoft Excel are described in conclusions.

Reliability Analysis of Ventilation System Based on Fuzzy Fault Tree

2013 ◽  
Vol 634-638 ◽  
pp. 3670-3677 ◽  
Author(s):  
Jun Meng
Keyword(s):  
Ventilation System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Feedback System ◽  
Mine Ventilation ◽  
Gansu Province ◽  
Elementary Event ◽  
Minimum Cut ◽  
Cut Set ◽  
Level 1

The fuzzy Fault Tree Analysis (FTA) of mine ventilation system is set up based on thorough composition of the system, with triangular fuzzy number being used as probability of elementary event and “mine ventilation system fault” being deemed as top event. In this paper, the reliability of FTA has been analyzed and applied to a mine in Gansu Province. The result shows that the minimum cut set of fault tree is 549 and the main reason why it has a huge number of minimum cut set is Level 1，Event 7，“Monitoring feedback system failure”. The reliability of top event and Level 1 event is low, and fuzzy failure probability of top event is (0.009, 0.014, 0.009), the maximum of which is 2.3% of it. The degree of fuzzy importance of elementary event is the highest in Level 1，Event 7. The maximum of fuzzy importance is 0.0843 by the normalization and the rest vary from 0.0050 to 0.0100 mostly.

scholarly journals The Computer Aided Fault Tree Modeling and Analysis of the Refrigerator Evaporator Failure

2014 ◽  
Vol 8 (1) ◽  
pp. 26-30 ◽  
Author(s):  
Quanyu Yu ◽  
Jie Liu ◽  
Kangkang Zhang
Keyword(s):  
Qualitative Analysis ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Analysis Procedure ◽  
Tree Analysis ◽  
Modeling And Analysis ◽  
Tree Modeling ◽  
Computer Aided ◽  
Analysis System

The paper analyzes the various factors that cause failure of refrigerator evaporator. The refrigerator evaporator failure spectrum is constructed through qualitative analysis of the fault tree system after building a corresponding fault tree system. There is an analysis procedure of fault tree system based on computer aided fault tree analysis system (CAFTA).

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