scholarly journals Risk Assessment of Groundwater Contamination: A Multilevel Fuzzy Comprehensive Evaluation Approach Based on DRASTIC Model

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Qiuwen Zhang ◽  
Xiaohong Yang ◽  
Yan Zhang ◽  
Ming Zhong
Keyword(s):  
Risk Assessment ◽  
Groundwater Contamination ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Drastic Model ◽  
Evaluation Approach ◽  
Sets Theory ◽  
Hierarchy Process ◽  
Water Supply Risk

Groundwater contamination is a serious threat to water supply. Risk assessment of groundwater contamination is an effective way to protect the safety of groundwater resource. Groundwater is a complex and fuzzy system with many uncertainties, which is impacted by different geological and hydrological factors. In order to deal with the uncertainty in the risk assessment of groundwater contamination, we propose an approach with analysis hierarchy process and fuzzy comprehensive evaluation integrated together. Firstly, the risk factors of groundwater contamination are identified by the sources-pathway-receptor-consequence method, and a corresponding index system of risk assessment based on DRASTIC model is established. Due to the complexity in the process of transitions between the possible pollution risks and the uncertainties of factors, the method of analysis hierarchy process is applied to determine the weights of each factor, and the fuzzy sets theory is adopted to calculate the membership degrees of each factor. Finally, a case study is presented to illustrate and test this methodology. It is concluded that the proposed approach integrates the advantages of both analysis hierarchy process and fuzzy comprehensive evaluation, which provides a more flexible and reliable way to deal with the linguistic uncertainty and mechanism uncertainty in groundwater contamination without losing important information.

An enhanced FMEA-based risk assessment for subsea compressor systems

2021 ◽  
pp. 1-31
Author(s):  
Haiyang Ge ◽  
Haibo Gao ◽  
Nianzhong Chen ◽  
Zhiguo Lin
Keyword(s):  
Risk Assessment ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Analytic Hierarchy ◽  
Effect Analysis ◽  
Quantitative Analyses ◽  
Potential Risks ◽  
The Impact ◽  
Hierarchy Process

Abstract An enhanced failure mode effect analysis (FMEA) based risk assessment for subsea compressor systems was proposed in this study. The enhanced model was established using a combination of fuzzy analytic hierarchy process (FAHP), fuzzy comprehensive evaluation, and FMEA. Different from the traditional FMEA model, the model improved the capability to identify system faults and to further measure the risk of a subsea compressor system through effective qualitative and quantitative analyses. A case study was then conducted to demonstrate the capability of the developed method in a complete risk assessment for a subsea compressor system and the subsystems and subcomponents with low reliabilities were identified. Comparing the enhanced model with previous models, it is found that the potential risks of some components are changed, and the components with higher potential risks in the system are identified. Sensitivity analysis to investigate the impact of parameters of subcomponents on system reliability was also performed.

The Application of Fuzzy Comprehensive Evaluation in Risk Assessment of Incremental Launching Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2028-2033 ◽  
Author(s):  
Zhong Chu Tian ◽  
Lei Yang ◽  
Tian Yong Jiang
Keyword(s):  
Risk Assessment ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Model ◽  
Analytic Hierarchy ◽  
Assessment Index ◽  
Comprehensive Evaluation Model ◽  
Assessment Index System ◽  
Hierarchy Process

The risk factors of continuous incremental launching bridge during construction stage are specialized. The risk in incremental launching stage is analyzed and identified. A risk assessment index system is built. A fuzzy comprehensive evaluation model is developed. The results obtained from the risk assessment model verifies the validity and practicality of the developed method by the combination of analytic hierarchy process and fuzzy mathematics theory. Moderate risk assessment results are developed to provide references for incremental launching construction method.

Multi-Level Fuzzy Comprehensive Evaluation for Rapid Manufacturing System

2011 ◽  
Vol 308-310 ◽  
pp. 1193-1197
Author(s):  
Li Hua Tao ◽  
Ren Jiang Li ◽  
Jun Feng Bai
Keyword(s):  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Determine Factor ◽  
Evaluation Index System ◽  
Analytic Hierarchy ◽  
Evaluation Approach ◽  
Comprehensive Evaluation Model ◽  
Multi Level ◽  
Hierarchy Process

In order to evaluate a RMS roundly and objectively, a multi-level fuzzy comprehensive evaluation approach based on analytic hierarchy process (AHP) is proposed in this paper. Firstly, a hierarchical and comprehensive evaluation index system for RMSs is extracted. Then, based on this structure, a multi-level fuzzy comprehensive evaluation model is developed, in which AHP is incorporated to determine factor weights.

scholarly journals Risk assessment of corroded casing based on analytic hierarchy process and fuzzy comprehensive evaluation

2020 ◽  
Author(s):  
Sheng-Shan Chen ◽  
Han-Xiang Wang ◽  
Hao Jiang ◽  
Ya-Nan Liu ◽  
Yan-Xin Liu ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Analytic Hierarchy Process ◽  
Risk Evaluation ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Assessment Model ◽  
Risk Level ◽  
Risk Assessment Model ◽  
Analytic Hierarchy ◽  
Hierarchy Process

Abstract Casing corrosion during CO2 injection or storage results in significant economic loss and increased production risks. Therefore, in this paper, a corroded casing risk assessment model based on analytic hierarchy process and fuzzy comprehensive evaluation is established to identify potential risks in time. First, the corrosion rate and residual strength characteristics are analyzed through corrosion tests and numerical simulations, respectively, to determine the risk factors that may lead to an accident. Then, an index system for corroded casing risk evaluation is established based on six important factors: temperature, CO2 partial pressure, flow velocity, corrosion radius, corrosion depth and wellhead pressure. Subsequently, the index weights are calculated via the analytic hierarchy process. Finally, the risk level of corroded casing is obtained via the fuzzy comprehensive evaluation. The corroded casing risk assessment model has been verified by a case well, which shows that the model is valuable and feasible. It provides an effective decision-making method for the risk evaluation of corroded casing in CO2 injection well, which is conductive to improve the wellbore operation efficiency.

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