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.

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.

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).

Failure Analysis of Automotive Differential Based on the Fault Tree

2014 ◽  
Vol 1049-1050 ◽  
pp. 871-874
Author(s):  
Ya Wei Pan ◽  
Quan Yu Yu ◽  
Fei Wang
Keyword(s):  
Fault Diagnosis ◽  
Qualitative Analysis ◽  
Failure Analysis ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Reliability Theory ◽  
Tree Analysis ◽  
Theoretical Methods

The paper analyzes a variety of reasons differential fault automobile differential and establishes the corresponding fault tree by using Fault Tree Analysis of reliability theory. The failure spectrum of automobile differential is constructed through qualitative analysis of the fault tree. Meanwhile the study gives the theoretical methods about the solving of top event’s probability and bottom event’s importance for design, fault diagnosis and repair of automobile differential.

FTA-Based Reliability Measurement with Support of TRA

2014 ◽  
Vol 543-547 ◽  
pp. 1091-1094
Author(s):  
Qi Lin ◽  
Yong Chen
Keyword(s):  
Reliability Analysis ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Research Area ◽  
New Method ◽  
Analysis Approach ◽  
Technology Readiness ◽  
Readiness Assessment ◽  
Tree Analysis ◽  
Reliability Measurement

Reliability is a research area of highly significance. It emphasizes an important analysis approach: Fault-Tree Analysis (FTA). Then a new method is proposed to collect authentic fault rate indexes, which is always the key of reliability analysis, based on technology readiness assessment (TRA). Last, it provides the quantified result of reliability analysis instance to show the usefulness of the approaches.

scholarly journals PENGEMBANGAN RISK ASSESSMENT DALAM EVALUASI MANAJEMEN PENANGGULANGAN KEBAKARAN MELALUI FAULT TREE ANALYSIS

2016 ◽  
Vol 5 (1) ◽  
pp. 36
Author(s):  
Annisa Sholikhatul Addawiyah ◽  
Rudatin Windraswara
Keyword(s):  
Risk Assessment ◽  
Management System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Minimum Cut ◽  
Tree Analysis ◽  
Undesirable Event ◽  
Regulatory Standards ◽  
Intermediate Event ◽  
Conditioning Event

Fault tree analysis adalah suatu penilaian risiko yang mampu mengidentifikasi potensi bahaya secara spesifik, fokus, rinci pada satu kejadian yang tidak diinginkan, dan mengetahui penyebab kejadian tersebut beserta angka probabilitasnya. Tercatat mulai tanggal 1 Januari – 30 April 2014 terjadi kebakaran sebanyak 10 kali di divisi spinning PT. Apac Inti Corpora dengan kasus tertinggi di unit spinning V (50% kejadian).Tujuan penelitian ini adalah mengetahui faktor penyebab kebakaran, mengembangkan penilaian risiko, dan mengetahui gambaran umum sistem manajemen penanggulangan kebakaran di unit spinning V PT. AIC. Desain penelitian ini adalah kualitatif eksplanatoris. Hasil pengembangan bagan fault tree analysis didapatkan 41 basic event, 24 intermediate event, 1 conditioning event, dan 1 undeveloped event yang secara matematis melalui persamaan aljabar boolean akan menghasilkan 35 single minimum cut sets dan 5 double component cut sets, dengan perhitungan angka probabilitas sebesar 0,3552. Hasil kesesuaian sistem manajemen penanggulangan kebakaran didapatkan 76 poin dari 81 poin standar regulasi yang berlaku di Indonesia. Simpulan penelitian ini adalah kemungkinan terjadinya kebakaran di spinning V sebesar 35,52%. Saran dari penelitian ini adalah dilakukannya evaluasi terhadap kegagalan deteksi dini dan kegagalan teknis. Fault tree analysis has advantages in identifying potential hazards in specifics, focus, detail on a potential undesirable event that called top event, and was able to find out the causes with the value of probability. Recorded at January 1th – April 30th, 2014, there had been 10 cases of fires in the spinning PT. Apac Inti Corpora with the highest cases at spinning V (50% event). The purpose of this research was find out the cause of fires, develop a risk assessment, and learn an overview of fires countermeasures management system in spinning V. This research was a qualitative – explanatory design. Result of development fault tree analysis brings about 41 basic event, 24 intermediate event, 1 conditioning event, dan 1 undeveloped event  by boolean algebra, mathematically generates 35 single minimum cut sets and 5 double component cut sets, with the value of probability is 0,3552. Whereas the countermeasure of fire management system conformity obtained 76 points is according from 81 points of regulatory standards in Indonesia. Summary, spinning unit V had the possibility of going fires is 35,52%. Advice, conducted evaluation of failure from early detection and technical failures in the production 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.

Application of Fault Tree Analysis on Environmental Pollution Caused by Chemical Fire Overflow

2011 ◽  
Vol 356-360 ◽  
pp. 636-640
Author(s):  
Ling Gao
Keyword(s):  
Qualitative Analysis ◽  
Environmental Pollution ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Tree Analysis ◽  
Minimal Cut Sets ◽  
Minimal Cut

With Fault Tree Analysis (FTA) method, the environmental pollution due to the chemical fire overflow is interpreted in terms of the causal and logical relations between various factors. The fault tree is established. And through the qualitative analysis by FTA, the minimal cut sets and the structure importance are determined. Consequently, the corresponding measures for reducing the occurrence of the top event are discussed.

Sign in / Sign up

Export Citation Format

Share Document