Determination of Occurrence Grades for Factors Affecting Congelation Failure on Basis of Fuzzy Comprehensive Assessment Method

2013 ◽  
Vol 753-755 ◽  
pp. 2916-2919
Author(s):  
Yang Wang ◽  
Qing Lin Cheng ◽  
Xian Li Li ◽  
Xi Yi
Keyword(s):  
Assessment Method ◽  
Comprehensive Assessment ◽  
Scientific Management ◽  
Pipeline Transportation ◽  
Fuzzy Comprehensive Assessment ◽  
Factors Affecting ◽  
Oil Pipeline ◽  
Improvement Measures ◽  
Financial Losses

Pipeline transportation is the most important transport mode for crude oil. When oil pipeline operates at low throughput or shutdown, congelation accident always happen as the temperature of oil in pipeline drops, which causes malignant accidents and significant financial losses. Study of the various factors affecting congelation failure is necessary. According to the statistics and analysis of congelation accident, direct and indirect reasons of affecting pipeline congelation failure were determined. Combining with fuzzy comprehensive assessment method, the related importance of factors on congelation accident was studied, and the grade of factors affecting failure congelation of pipeline was also identified. Aiming at the factors, some improvement measures were put forward. These can provide evidences for accident treatment, planned maintenance, security operation and scientific management.

Research on a Nonlinear Fuzzy Comprehensive Assessment Method for Oil & Gas Pipeline Failure Based on Fault Tree Analysis

2012 ◽  
Vol 187 ◽  
pp. 304-310
Author(s):  
Xue Wu ◽  
Ci Yuan Xiao ◽  
Xue Yan Xu
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Engineering Application ◽  
Assessment Method ◽  
Comprehensive Assessment ◽  
Gas Pipeline ◽  
Combination Method ◽  
Fuzzy Comprehensive Assessment ◽  
Tree Analysis ◽  
Pipeline Failure

The combination method of fault tree analysis and nonlinear fuzzy comprehensive assessment method was proposed to make research of oil & gas pipeline failure .The common factors influencing oil & gas pipeline failure could be determined with fault tree analysis .However , the practical operated oil & gas pipeline often have some individual factors and fuzzy ones .Nonlinear fuzzy comprehensive assessment method could evaluate objectively based on evaluated factors sets and weight sets provided by fault tree analysis .The new model steps were listed by taking the example of oil & gas pipeline failure .The result indicates that the method is more reasonable and easier for engineering application , and the evaluation result is more with the objective reality.

scholarly journals A Hazard Assessment Method for Waterworks Systems Operating in Self-Government Units

2019 ◽  
Vol 16 (5) ◽  
pp. 767 ◽  
Author(s):  
Janusz R. Rak ◽  
Barbara Tchórzewska-Cieślak ◽  
Katarzyna Pietrucha-Urbanik
Keyword(s):  
Critical Infrastructure ◽  
Tap Water ◽  
Assessment Method ◽  
Water Safety ◽  
Risk Matrix ◽  
Factors Affecting ◽  
The City ◽  
Financial Losses ◽  
Special Protection

Informing users of waterworks systems about the quality of tap water is an obligatory trend. It should be accompanied by studies on the influence of the risk of threats on public health. Waterworks systems, being included in a critical infrastructure of the city, should be subject to special protection in this respect. In the paper, the authors’ method of assessing threats to people and property from waterworks systems functioning in self-government units (SGUs), is proposed. Four categories of factors affecting the risk of threat to tap water consumers were assumed: the frequency or the probability of exposure—P, financial losses—C, damages to peoples’ health—HL, the degree of the security—S. Based on this, a four-parametric risk matrix was developed. It was assumed that risk is a function of the parameters mentioned above: r = f(P, C, HL, S). For every parameter the five-parametric weight scale was assumed. An example of applying the method is presented. The proposed method should be an important element of water safety plans. It can also be adopted for other municipal systems subject to SGU.

scholarly journals Study on Health Assessment Method of a Braking System of a Mine Hoist

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 769 ◽  
Author(s):  
Juanjuan Li ◽  
Guoying Meng ◽  
Guangming Xie ◽  
Aiming Wang ◽  
Jun Ding ◽  
...  
Keyword(s):  
Neural Network ◽  
Health Management ◽  
Back Propagation ◽  
Health Assessment ◽  
Assessment Method ◽  
Health Condition ◽  
Comprehensive Assessment ◽  
Fuzzy Comprehensive Assessment ◽  
Braking System ◽  
Mine Hoist

This paper presents a method for calculating the health degree (HD) of a braking system of a mine hoist combined with three-level fuzzy comprehensive assessment (TLFCA) and a back-propagation neural network (BPNN). Firstly, the monitored values of a sensor are fused by multi-time fusion and the fuzzy comprehensive assessment values (FCAVs) of the health condition (HC) of the sensor are obtained. Secondly, the FCAVs of all sensors in a subsystem are fused by multi-sensor fusion, and FCAVs of the subsystem are obtained. Then the FCAVs of all subsystems are fused by multi-subsystem fusion and FCAVs of the system are obtained. All the FCAVs are fed into a pre-trained neural network, and the corresponding HD of the sensor, subsystem and system is obtained. Finally, the practicability, reliability and sensitivity of the proposed method are verified by the monitored values of the test rig. This paper presents a method to provide technical support for intelligent maintenance, and also provides necessary data for further prognostics health management (PHM) of the braking system. The method presented in this paper can also be used as a reference for the HD calculation of the whole hoist and other complicated equipment.

Fuzzy Comprehensive Assessment of Smart Grid Maturity

2014 ◽  
Vol 960-961 ◽  
pp. 803-807
Author(s):  
Ming Dong Wang ◽  
Wen Xia Su ◽  
Bin Kong
Keyword(s):  
Smart Grid ◽  
Development Stage ◽  
Assessment Method ◽  
Comprehensive Assessment ◽  
Assessment Methods ◽  
Assessment System ◽  
Weak Links ◽  
Maturity Model ◽  
Fuzzy Comprehensive Assessment ◽  
The Poor

Smart grid must be evaluated correctly so that its development stage is determined and weak links, restrict factors in development are found. Based on it, the path from the stage to the next stage is planned for power enterprises. In view of the poor accuracy of conventional assessment methods, caused by subjective factors and uncertainty, the fuzzy comprehensive assessment method is applied to assess smart grid. Firstly, a smart grid assessment system is founded based of IBM’s smart grid maturity model, and then method and procedure of fuzzy comprehensive assessment method are introduced. The study on an example shows that this approach is effective and feasible.

Application of Fuzzy Comprehensive Assessment Method to Result Assessment of Basketball Professional Courses in Physical Academies

2013 ◽  
Vol 718-720 ◽  
pp. 507-511
Author(s):  
Gao Zhi
Keyword(s):  
International Development ◽  
Alternative Assessment ◽  
Dynamic Assessment ◽  
Educational Assessment ◽  
Assessment Method ◽  
Comprehensive Assessment ◽  
Qualitative Assessment ◽  
Fuzzy Comprehensive Assessment ◽  
Assessment Index ◽  
Scientific Practical

The paper discusses and researches the assessment method of graduation results for basketball elective course in Wuhan Institute of Physical Education preliminarily, by literatures and questionnaires. It is shown from the research results that the comprehensive assessment method based on fuzzy mathematical theory reflects the wide practicality and adaptability in the assessment of elective results in physical academies. The educational assessment of physical colleges is conducted under a special circumstance. Over the last decade, lots of new ideas, new concepts, new models, and new methods of foreign education assessment have appeared, such as: alternative assessment, implementation assessment, and dynamic assessment. Some are more mature with feasibility and application value, some methods are cumbersome, lack of feasibility and universal. The paper pays the full attentions and makes calm analysis for the domestic and international development trends in the assessment, based on the scientific, practical, and innovative way. The discussed fuzzy comprehensive assessment method is a method that applies the fuzzy mathematics to educational assessment filed, which highlights the systematization of assessment index of students. It emphasizes the combination of qualitative assessment and quantitative assessment for a comprehensive, objective, and fair assessment of students' development, to describe the condition and progress of students more clearly and accurately.

Congelation Risk Assessment of Oil Pipeline on Basis of Improved Monte-Carlo Method

2013 ◽  
Vol 365-366 ◽  
pp. 1324-1327
Author(s):  
Xian Li Li ◽  
Yang Wang ◽  
Wen Kun Su ◽  
Qing Lin Cheng
Keyword(s):  
Risk Assessment ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Crude Oil ◽  
Pour Point ◽  
Reliability Theory ◽  
Scientific Management ◽  
Oil Pipeline ◽  
Failure Possibility ◽  
Financial Losses

Congelation accident in pipeline of crude oil is always being a serious problem in china, which is mainly determined by the properties of domestic crude oil such as high content of wax, high pour point and viscosity. When oil pipeline operates at low throughput or shutdown, congelation accident always happen as the temperature of oil drops, which causes malignant accidents and significant financial losses. Using improved Monte-Carlo method of reliability theory, the failure possibility of congelation was numerically calculated. Whereas, the consequences of congelation accident were also fully analyzed, these can provide evidences for accident treatment, planned maintenance, security operation and scientific management.

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