Fault Tree Analysis on Hydraulic System Causing Fire of Heavy Self-Dumping Truck

2012 ◽  
Vol 619 ◽  
pp. 425-430
Author(s):  
Chang Su ◽  
Wei Jia Su
Keyword(s):  
Hydraulic System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Spare Parts ◽  
Mine Safety ◽  
Prevention Measures ◽  
Oil Leakage ◽  
Spare Parts Management ◽  
Safety Production ◽  
Fire Accident

The fire accident of heavy mineral self-dumping truck is one of the most serious disaster in mine safety production. Research on the reasons that cause fire accident is an important study for ensuring safety production. By analyzing three elements that constitute self-dumping truck fire accident, the characteristics and easy ignition points as well as major combustion parts of self-dumping truck fire accident, we confirm that the hydraulic system leakage is the major factor that causes fire. To find out the fault reason of hydraulic system oil leakage, we analyze the composition and working principle of self-dumping truck, establish leakage fault tree of hydraulic system. Based on logic relationships between each fault and fire, we get the following conclusion: hydraulic tubing damage is the highest probability event that causes oil leakage fault. In addition, we should pay attention to spare parts management factor, correct driving factor and equipment management factor. We also propose the prevention measures of leakage and fire

Cause factors in emergency process of fire accident for oil–gas storage and transportation based on fault tree analysis and modified Bayesian network model

2018 ◽  
Vol 29 (5) ◽  
pp. 802-821 ◽  
Author(s):  
Changfeng Yuan ◽  
Hui Cui ◽  
Bin Tao ◽  
Siming Ma
Keyword(s):  
Bayesian Network ◽  
Network Model ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Analysis Method ◽  
Bayesian Network Model ◽  
Tree Analysis ◽  
Oil Gas ◽  
Emergency Process ◽  
Fire Accident

From the perspective of the safety of emergency process, in this paper, we put forward a new analysis method of cause factors based on fault tree analysis and modified Bayesian network in emergency process of fire accident for oil–gas storage and transportation. Nineteen cause factors are found based on the statistical analysis of actual accident cases. We adopt fault tree analysis method and Bayesian network model to analyze cause factors qualitatively and quantitatively. In order to more accurately determine the quantitative influencing degree of each cause factor, the conditional probabilities in Bayesian network are modified by using expert scoring method and modified Bayesian network model is established. Finally, the proposed method is applied to analyze cause factors in emergency process of two practical accident cases. Research results have an important scientific significance to reveal evolution mechanism of secondary accidents in emergency process and ensure system safety in whole life cycle.

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.

Third-Party Damage Model for Gas Distribution Pipelines

2018 ◽  
Author(s):  
Joseph S. Santarelli ◽  
Wenxing Zhou ◽  
Carrie Dudley-Tatsu
Keyword(s):  
Emergency Preparedness ◽  
Damage Model ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Probability Of Failure ◽  
Boolean Logic ◽  
Third Party ◽  
Prevention Measures ◽  
Tree Model ◽  
Economic Implications

Third-party damage (TPD) is any damage to underground infrastructure that occurs during work unrelated to the asset. In 2015, there were 10,107 TPD incidents in Canada causing over a billion dollars in estimated damage. TPD is the leading cause of failure for distribution gas pipelines; since distribution pipelines are generally located in areas with high population densities, TPD has significant safety and economic implications. In this study, a probabilistic model is developed to qualify the probability of failure of distribution pipelines due to TPD. The model consists of a fault tree model to quantify the probability of hit given the occurrence of third-party excavation activities and the methodology to evaluate the probability of failure given hit. Fault tree analysis (FTA) is a top down, deductive failure analysis method which uses Boolean logic to combine a series of basic events to analyze the state of a system. Earlier prior research demonstrated the ability of a FTA to quantify the probability of TPD occurring on natural gas transmission pipeline systems. These models allow for a quantitative analysis of preventative measures and, in conjunction with current practices, facilitate a predictive method to plan and optimize resource allocation for damage mitigation and emergency preparedness. The developed TPD model is validated using the data provided from a region in Southwest Ontario. The model will provide distribution companies with a practical tool to identify third-party damage hot spots, develop proactive third-party damage prevention measures, and prioritize damage repair activities using a risk-based approach.

Fault Diagnosis to Mid-Size Excavator Hydraulic System Based on Fault Tree Analysis

2010 ◽  
Vol 44-47 ◽  
pp. 1110-1114
Author(s):  
Chi Ma ◽  
Ke She Wang ◽  
Jiang Hong Sun
Keyword(s):  
Hydraulic System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
System Structure ◽  
Qualitative And Quantitative Analysis ◽  
Logical Relationship ◽  
Tree Analysis ◽  
Qualitative And Quantitative ◽  
Weakest Link ◽  
Relationship Of

Analyzes slewing hydraulic system of hydraulic excavator by fault tree analysis. According to logical relationship of slewing hydraulic system structure, draws fault tree. Finishes qualitative and quantitative analysis. Divides the minimum cut sets. Calculates the reliability of the whole system in order to find the weakest link. Puts forward ways to increase the reliability.

scholarly journals Safety Assessment hydraulic system Aircraft H-8

2017 ◽  
Vol 9 (2) ◽  
pp. 39
Author(s):  
Cyrilus Sukoco Budiono
Keyword(s):  
Hydraulic System ◽  
Safety Assessment ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Assessment Process ◽  
System Safety ◽  
Markov Analysis ◽  
Tree Analysis ◽  
Failure Conditions ◽  
Secondary Power

Safety Assessment hydraulic system Aircraft H-8AbstrakSistem hidrolik termasuk secondary power yang digunakan untuk menggerakkan bidang atur kendali terbang, mengeluarkan dan melipat roda pendarat, dan memberikan tenaga pengereman ketika pesawat di darat. Kegagalan sistem hidrolik dapat menyebabkan pesawat hilang kendali sehingga memungkinkan pesawat mengalami kecelakaan dan jatuhnya korban jiwa. Penelitian ini membahas tentang penilaian keselamatan sistem hidrolik pesawat terbang H-8 yang mencakup proses penilaian keselamatan, regulasi mengenai sistem hidrolik pesawat terbang, beban-beban yang harus ditanggung oleh sistem hidrolik, dan prestasi sistem hidrolik pesawat H-8. Penilaian keselamatan dimulai dari melakukan identifikasi fungsi, kondisi kegagalan, efek kegagalan, dan mengklasifikasikan kondisi kegagalan dari sistem hidrolik tersebut.Kata kunci : System Safety Assessment (SSA), sistem hidrolik, Fault Tree Analysis (FTA), Markov Analysis (MA), Fanctional Hazard Asessment (FHA). Abstract A hydraulic system is one of the secondary power used to drive the flight control surfaces, retract and extend landing gears, and to provide power to wheel brakes when the aircraft is on the ground. The failure of the hydraulic system results in aircraft lost of control which can lead to aircraft accident and passenger deaths. This journals discusses the safety assessment of the hydraulic system to be used in H-8 aircraft which includes the safety assessment process, regulations of the aircraft hydraulic system, the hydraulic system loads, and the aircraft hydraulic systems performance. The safety assessment begins with identification and classification of the functions, failure conditions, the effects of failure, and classify the failure conditions of the hydraulic system.Key word : System Safety Assessment (SSA), hydraulic system, Fault Tree Analysis (FTA), Markov Analysis (MA), Fanctional Hazard Asessment (FHA).

Fuzzy Dynamic Fault Tree Analysis of Hydraulic System of CNC Machining Center

2011 ◽  
Author(s):  
Yan-Feng Li ◽  
Jian Sun ◽  
Haiqing Li ◽  
Hong-Zhong Huang ◽  
Yu Liu
Keyword(s):  
Hydraulic System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Probability Of Failure ◽  
Cnc Machining ◽  
Extension Principle ◽  
Tree Analysis ◽  
Dynamic Fault Tree ◽  
Machining Center ◽  
Cnc Machining Center

Fault tree analysis (FTA), as an effective reliability assessment tool, is a widely used in analyzing the risk and reliability of large scale and complex engineering systems. Dynamic fault tree analysis (DFTA) extends the static fault tree by defining additional gates to model the complicated interactions, and in most case, Markov models can be used to solve dynamic gates. In many real systems, it is quite difficult to evaluate the probability of failure events preciously due to many uncertainty factors. To account for the uncertainty resulting from the lack of sufficient data or the subjective adjustments from experts, a fuzzy dynamic fault tree model is proposed to assess the system reliability when acquiring precious probability of failure event is impossible. With the aim of obtaining the membership function of the fuzzy probability of the top event, the extension principle is employed. The proposed method and algorithm are demonstrated by a case study of the hydraulic system of a specific CNC machining center.

Fault Diagnosis to Mid-Size Excavator Bucket Hydraulic System Based on Fault Tree Analysis

2012 ◽  
Vol 190-191 ◽  
pp. 88-92
Author(s):  
Jiang Hong Sun ◽  
Chi Ma ◽  
Yuan Lin Yi
Keyword(s):  
Hydraulic System ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
System Structure ◽  
Qualitative And Quantitative Analysis ◽  
Logical Relationship ◽  
Tree Analysis ◽  
Qualitative And Quantitative ◽  
Excavator Bucket ◽  
Relationship Of

Analyzes bucket hydraulic system of hydraulic excavator by fault tree analysis. According to logical relationship of hydraulic system structure, draws fault tree, finishes qualitative and quantitative analysis .Divides the minimum cut sets. Calculates the reliability of whole system to find the weakest components. Puts forward ways to increase the reliability on basis of oil pipe.

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