Abstract
Maintenance Scheduling and repair time of equipment play a significant role in the availability and reliability of power plants. This paper focuses on repair time estimation and time-dependent availability of the main components of a gas turbine power plant and their constituent sub-systems based on the direct use of human experience. This approach covers all different repair scenarios and estimates their unsteady-state annual availability and repair rates for the sub-components and the entire power plant. For this purpose, a human knowledge database, training, and simulating algorithm were used to obtain the desired results. Fuzzy logic and an adaptive neuro-fuzzy inference system were employed for simulating and predicting repair time. The Monte Carlo simulation method was also utilized to estimate the annual time-dependent availability for 20 years. The approach was used for predicting the availability of a power plant during its final five years of operation. The results revealed the critical components in the power plant units and indicated that the fuel system and lubrication system had lower availability than other units in the power plant, with availability averages of 95.5% and 96.4%, respectively. Therefore, these units had more susceptibility to failure than others. For the total system, the highest availability, 95%, was estimated to occur in the 16th year of the power plant operation. However, the lowest availability, 87% was predicted for the 19th year of the plant’s operation period.
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Abbreviations
- FIS:
-
Fuzzy inference system
- ANFIS:
-
Adaptive neuro-fuzzy system
- MF:
-
Membership function
- A:
-
Fuzzy set
- \(\mu_{{\text{A}}} \left( x \right)\) :
-
Membership function for the fuzzy set A
- a:
-
Year
- d:
-
Day
- h:
-
Hour
- r:
-
Number of rules in fuzzy logic
- \(\tilde{A}_{1}^{\text{r}} ,\tilde{A}_{2}^{\text{r}} , \ldots ,\tilde{A}_{\text{n}}^{\text{r}}\) :
-
Linguistic values of the repair factors or fuzzy sets
- \(\tilde{b}^{\text{r}}\) :
-
Output linguistic value of the repair time
- b:
-
Fuzzy output
- \({\text{FP}}_{{{\text{nr}}}} \;{\text{and}}\;{\text{FP}}_{{{\text{br}}}}\) :
-
Prepositions in the sense of n-valued logic
- \(\mu_{{\tilde{A}_{\text{i}}^{\text{r}} }} (x_{\text{i}} )\;{\text{or}}\;\mu_{{{\text{FP}}_{{{\text{ir}}}} }} (x_{\text{i}} )\) :
-
Strength of the membership function (MF) prepositions in fuzzy logic
- \(\mu_{{\tilde{b}^{\text{r}} }} \;{\text{or}}\;\mu_{{{\text{FP}}_{{{\text{br}}}} }} (b)\) :
-
Strength of MF consequent in fuzzy logic
- \(y_{\text{i}} ,\;x_{\text{i}}\) :
-
Inputs of ANFIS
- \(w_{\text{i}}\) :
-
Fuzzy ANFIS output
- \(\overline{w}_{\text{i}}\) :
-
Normalized fuzzy ANFIS output
- Y:
-
Final output of ANFIS
- \(p_{\text{i}} ,q_{\text{i}} ,r_{\text{i}}\) :
-
Consequent parameters of output node i in ANFIS
- v1:
-
Training inputs
- v2:
-
Training target
- RMSE:
-
Root-mean-squared error
- m(t)::
-
Repair probability distribution function
- ɛ(t)::
-
Repair rate
- M(t)::
-
Maintainability
- R(t)::
-
Reliability
- λ:
-
Failure ratetOperating time
- t :
-
Repair time
- CDF:
-
Cumulative distribution function
- PDF:
-
Probability distribution function
- A(t)::
-
Availability
- n :
-
Number of iterations in Monte Carlo simulation
- m :
-
Number of the year under consideration in Monte Carlo simulation
- RCM:
-
Reliability centered maintenance
- RCA:
-
Root cause analysis
- RBI:
-
Risk based inspection
- FFS:
-
Fitness for service
- MTBF:
-
Mean time between failures
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Mirzaei, D., Behbahaninia, A., Abdalisousan, A. et al. Annual availability assessment of a gas turbine power plant using Monte Carlo simulation based on fuzzy logic and an adaptive neuro-fuzzy repair time prediction system. J Therm Anal Calorim 148, 8675–8696 (2023). https://doi.org/10.1007/s10973-023-12091-7
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DOI: https://doi.org/10.1007/s10973-023-12091-7