جستجوی مقالات مرتبط با کلیدواژه "vikor method" در نشریات گروه "پزشکی"

Failure modes and effects analysis (FMEA) method is used in industries to identify, assess and prioritize risks. Multi-criteria decision-making methods (MCDM) select the best option from different criteria. Therefore, this study aims to identify, assess and prioritize risks using FMEA based on SWARA-VIKOR multi-criteria decision-making methods in a gas pressure reduction station.

In this descriptive and analytical study, stepwise weight assessment ratio analysis (SWARA) and decision-making optimization and compromise solution (VIKOR) methods were used to rank the risks of failure modes identified in FMEA. SWARA method was employed to determine the severity, probability and discovery weights, and VIKOR technique was applied to rank the failure modes of the system equipment. Finally, an operational example of the pressure reduction station was presented to show the application and feasibility of the proposed model. A comparative study was conducted to confirm the practicality and effectiveness of the proposed model.

In total, 35 main failure modes were identified in the pressure reduction station. Failure of regulator sleeve and safety valve and regulator diaphragm rupture were assigned the first, second and third ranks of risk priority, respectively. The sensitivity analysis results showed the proposed approach had desirable stability and only the failure mode of increasing the heater flame temperature was very sensitive to changes in the weight of the criteria. Results of ranking the failure modes of the station indicated there were many changes in the ranking of failure modes based on the proposed approach.

The proposed approach could provide more reasonable and accurate results for ranking risks because the criteria were weighed step by step based on the experts’ opinion.

Failure modes and effects analysis (FMEA) is a risk-management method used in industries promote the safety of processes and systems. Fuzzy multi-criteria decision methods are methods that choose the best option from several different criteria. The purpose of this article is to assess the risk using the FMEA method based on stepwise weight assessment ratio analysis (SWARA) - relative-entropy (RE) - VIseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) fuzzy multi-criteria decision-making (MCDM) methods in an urban gateway gas pressure reduction station.

In this descriptive-analytical study, SWARA fuzzy methods were used to determine the weight of risk factors, RE was used to weigh team members, and VIKOR was employed to rank failure modes, such that these modes were identified and evaluated based on the opinion of four experts with at least five years of experience. At the end, the sensitivity and comparative analysis of the proposed approach was performed.

Six failure modes were identified in the main equipment of Darveza Shahri gas pressure reduction station. The failure mode of the regulator, filter, and the odorize system ranked first, second, and third in terms of risk priority. The risk intensity index had a higher priority than other indices. Twelve sensitivity analysis tests were performed, and the failure mode of the regulator and the heater were the least and the most sensitive, respectively. Furthermore, the results of the sensitivity and comparative analysis supported the validity of the proposed approach.

According to the results of SWARA, RE and VIKOR fuzzy methods, the proposed approach eliminates the problem of the same weights of risk factors, the uncertainty in the data (experts' opinions) and the prioritization of failure modes, compared to the traditional FMEA method. It can also prioritize risks more effectively.