Wire Suspension System Based on Fault Tree Analysis Running Condition Assessment

2014 ◽  
Vol 986-987 ◽  
pp. 1401-1404
Author(s):  
Bing Hao ◽  
Li Zhi
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Condition Assessment ◽  
Suspension System ◽  
Weak Links ◽  
Tree Analysis ◽  
Overhead Transmission Line ◽  
Wire Suspension

Overhead transmission lines is an important part in the power system and the lifeblood of the transmission system.Important element of the transmission line conductor suspension system namely conductor and insulator, hardware.This paper, by using the fault tree analysis method, establishes the mathematical model of the transmission line conductor suspension system running condition assessment, reliably evaluates the running status of system, find out the weak links and the problems of the various parts, for the evaluation and maintenance of overhead transmission line provide theoretical support.

Risk Assessment on Fuzzy Fault Tree Analysis for Power Transmission Line Field Maintenance Work

2014 ◽  
Vol 1044-1045 ◽  
pp. 412-416 ◽  
Author(s):  
Zhi Hui Li ◽  
Qin Xiang Gao ◽  
Jie Hui
Keyword(s):  
Transmission Line ◽  
Fuzzy Numbers ◽  
Power Transmission ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Power Transmission Line ◽  
Line Field ◽  
Tree Analysis ◽  
Fuzzy Fault Tree Analysis ◽  
Maintenance Work

This paper introduces a fault tree (FT) method based on fuzzy numbers, aiming to deal with the inadequate statistics and the uncertain probability of the basic events during the fault tree analysis for power transmission line field maintenance work. Based on expert judgment, the Delphi method is used to transform fuzzy language to triangular fuzzy numbers, finally an approach for defuzzification is developed. A typical hazard in replacing the linear composite insulator of 500kV transmission line field maintenance work is presented for a case study. The method is conducive to a better risk pre-control and decision-making.

scholarly journals Failure Analysis for Hydraulic System of Heavy-Duty Machine Tool with Incomplete Failure Data

2021 ◽  
Vol 11 (3) ◽  
pp. 1249
Author(s):  
Shizheng Li ◽  
Zhaojun Yang ◽  
Hailong Tian ◽  
Chuanhai Chen ◽  
Yongfu Zhu ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Machine Tools ◽  
Hydraulic System ◽  
Rough Set Theory ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Weak Links ◽  
Heavy Duty ◽  
Tree Analysis ◽  
Failure Data

A hydraulic system is a key subsystem of heavy-duty machine tools with a high failure intensity, the failure of which often causes shutdown of production and economic loss in machining. Therefore, it is necessary to implement failure analysis to identify the weak links of system and improve the reliability. For hydraulic system, there is often an amount of failure data collected in field, which help to calculate the occurrence probability of basic events through fault tree analysis method. However, the data are incomplete and uncertain. To address this issue, this study presents a fault tree analysis methodology. Experts’ opinions are utilized, combined with field data based on the Dempster–Shafer theory and rough set theory to fill the incompleteness and eliminate the uncertainty. For application in a case study, a fault tree of the hydraulic system of heavy-duty machine tools is firstly constructed. Then, the importance analysis is performed to help identify the weak links of hydraulic system. The results show the critical basic events affecting the safety and reliability of a hydraulic system.

Fault Tree Analysis for a Modern Communication System

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Kamal Hamid ◽  
Nadim Chahine
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Theory And Practice ◽  
Tree Analysis ◽  
Satisfactory Performance ◽  
System Components ◽  
Link Budget ◽  
Simulation Results

Wireless communications became one of the most widespread means for transferring information. Speed and reliability in transferring the piece of information are considered one of the most important requirements in communication systems in general. Moreover, Quality and reliability in any system are considered the most important criterion of the efficiency of this system in doing the task it is designed to do and its ability for satisfactory performance for a certain period of time, Therefore, we need fault tree analysis in these systems in order to determine how to detect an error or defect when happening in communication system and what are the possibilities that make this error happens. This research deals with studying TETRA system components, studying the physical layer in theory and practice, as well as studying fault tree analysis in this system, and later benefit from this study in proposing improvements to the structure of the system, which led to improve gain in Link Budget. A simulation and test have been done using MATLAB, where simulation results have shown that the built fault tree is able to detect the system’s work by 82.4%.

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