A reliability risk analysis method based on the fuzzy fault tree and fuzzy event tree

2016 ◽  
Author(s):  
Cai Quan ◽  
Liang Lingqiang ◽  
Yu Dongping ◽  
Yingkui Gu
Keyword(s):  
Risk Analysis ◽  
Fault Tree ◽  
Event Tree ◽  
Analysis Method ◽  
Fuzzy Event

Study and Analyse Hydraulic System of a Boat by Using Risk Analysis Method

2012 ◽  
Vol 542-543 ◽  
pp. 119-123
Author(s):  
Ning Li ◽  
Yuan Gu ◽  
Shi Long Xing ◽  
Lu Li
Keyword(s):  
Risk Analysis ◽  
Failure Probability ◽  
Hydraulic System ◽  
Fault Tree ◽  
Minimum Cut ◽  
Analysis Method ◽  
Reliability Method ◽  
Cut Set ◽  
Working Out

Analysis hydraulic system of a boat by using reliability method, setting up the fault tree, confirming the minimum cut set, working out the failure probability and the criticality importance of all base events. The datum is provided for security and maintainability.

STP Balance of Plant Model Update Experience and Results

2009 ◽  
Author(s):  
Ernie Kee ◽  
Fatma Yilmaz ◽  
Don Wakefield ◽  
Steve Epstein
Keyword(s):  
Risk Analysis ◽  
Fault Tree ◽  
Assessment Model ◽  
Analysis Tool ◽  
Event Tree ◽  
Data Types ◽  
Model Framework ◽  
Production Risk ◽  
Balance Of Plant ◽  
Production Losses

The South Texas Project (STP) balance of plant (BOP) model for production losses has been converted from an Excel-based software application that uses minimal cutsets from a single large fault tree, to a set of small fault trees used within a risk analysis tool, Riskman® [8]. The Riskman® application provides estimates of interest to plant investors and owners such as potential production losses and plant profitability, as well as production reliability and quality (loss frequency, type of loss, loss duration and standard economic risk metrics). The BOP models and methodologies developed are applicable to both fault-tree linking and event-tree linking styles of risk analysis. The STP BOP model is developed to support configuration risk management in two categories: 1) trip risk and concomitant core damage frequency; and 2) non-trip production risk. The primary purpose for the conversion work is to make the STP BOP model framework and application platform consistent with the STP probabilistic risk assessment model. In the course of the conversion, improvements to the Riskman® software have been implemented and techniques to more efficiently produce BOP modeling (fault tree) improvements were developed. Better methods to accurately calculate initiating event frequencies are studied. New data types added to support BOP modeling are described.

scholarly journals Risk analysis in case of fire on PZL BRYZA using the event tree analysis / Analiza ryzyka w przypadku pożaru samolotu PZL BRYZA z wykorzystaniem metody drzewa zdarzeń

2016 ◽  
Vol 38 (1) ◽  
pp. 245-270
Author(s):  
Mateusz Papis ◽  
Marek Matyjewski
Keyword(s):  
Risk Analysis ◽  
Statistical Data ◽  
Flight Safety ◽  
Event Tree ◽  
Analysis Method ◽  
Event Tree Analysis ◽  
Tree Analysis ◽  
Aircraft Flight ◽  
Probability Of Death

Abstract The paper presents application of the Event Tree Analysis method for analyzing risk in complex situations. A model associated with the occurrence of fire on PZL Bryza was developed using the aircraft flight manual. The probabilities of events caused by the initiating event and the losses caused by each of the highlighted final undesirable events were determined. Statistical data for flight safety was used to calculate probability of the initiating event. The risk was determined as the probability that losses of at least given category will occur during one flight. As a result of the conducted analysis it was found that the probability of in-flight fire is very small. However, in such a case, the probability of death of one or more passengers is relatively high.

scholarly journals Analysis and risk assessment of risk technical systems in the development of the methodology for the students training by transforming structures

2019 ◽  
Vol 6 ◽  
pp. 75-82
Author(s):  
Tsvetelina Simeonova
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Block Diagram ◽  
Fault Tree ◽  
Risk Identification ◽  
Event Tree ◽  
System Description ◽  
Technical Systems

The purpose of this article is to develop a methodology for risk analysis by transforming structures. A methodology for risk analysis is proposed by transforming structures based on existing links between the system description through a block diagram, a fault tree, and an event tree. Risk analysis of risk techniques by fault tree and event tree provides an unambiguous relationship between element parameters and parity of equivalent elements describing a system or a subsystem. An example of risk analysis by transforming structures is presented, according to the proposed methodology applicable to risk identification, including transformations between block diagram and fault tree and event tree, as well as variants to determine their risk (at accepted value of damages), according to acceptances made. A methodology has been developed and examples of risk analysis by transformation of structures are shown.

scholarly journals Risk analysis in the implementation of a Medalj stream regulation project

2020 ◽  
pp. 91-106
Author(s):  
Petar Neskovic ◽  
Nada Dragovic ◽  
Tijana Vulevic ◽  
Jelena Panic
Keyword(s):  
Risk Analysis ◽  
Fault Tree ◽  
Event Tree ◽  
Risk Matrix ◽  
Unexpected Events ◽  
Risk Event ◽  
Fmea Method ◽  
Tree Method ◽  
Event Occurrence ◽  
Level Of Risk

During the construction of the regulation of a watercourse, a large number of unexpected events can occur and increase the risk associated with the project hindering its successful realization. Risk events can result in breaking deadlines, increasing costs, reducing quality, etc. This paper analyzes the risk in the implementation of the Medalj stream regulation project, using the appropriate method that gives the best results for each phase of the risk analysis. Thus, the HAZOP method was used to identify risk events, the risk matrix to define the level of risk, the FMEA method to propose actions to reduce the possibility of risk event occurrence, the Fault tree method to determine the cause of risk event occurrence and the Event tree method to determine possible outcomes of risk events. The obtained results showed that the key risk event was ?Only a part of the planned soil excavated?, so the paper will present the results related to earthworks, although the analysis referred to the entire project.

scholarly journals Risk Analysis of Earth-Rock Dam Failures Based on Fuzzy Event Tree Method

2018 ◽  
Vol 15 (5) ◽  
pp. 886 ◽  
Author(s):  
Xiao Fu ◽  
Chong-Shi Gu ◽  
Huai-Zhi Su ◽  
Xiang-Nan Qin
Keyword(s):  
Risk Analysis ◽  
Event Tree ◽  
Dam Failures ◽  
Fuzzy Event ◽  
Tree Method

scholarly journals Risk Analysis Using HAZOP -Fault Tree - Event Tree Methodology Case Study: Naphta Stabilizer-A Reflux Drum (LPG separation) in RA1K

2020 ◽  
Vol 5 (2) ◽  
pp. 98-105
Author(s):  
Seif El Islam Bouasla ◽  
Youcef ZENNIR ◽  
El-Arkam MECHHOUD
Keyword(s):  
Risk Assessment ◽  
Risk Analysis ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Event Tree ◽  
Tree Analysis ◽  
Assessment Approach ◽  
Accident Scenarios ◽  
Tree Approach

The purpose of this work is the risk assessment of a stabilizer reflux drum using HAZOP - Fault tree - Event tree approach. This risk assessment approach aims first of all to identify potential accident scenarios using Hazard an Operability study (HAZOP), these scenarios need more detailed frequencies estimation, it is performed thanks to fault tree analysis. Then, to analyze events issuing after success or fail of safety barriers, the event tree is used. Finally, in order to better appreciate accident scenarios, ALOHA is utilized to simulate them.

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