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Fault tree analysis (FTA) has been widely utilized as a reliability evaluation technique for complex systems, such as nuclear power plants and aerospace systems. However, it is hard to obtain the crisp failure probabilities of basic events, owning to the insufficient information about some complex engineering systems. Hence, fuzzy set theory and fuzzy arithmetic operation (FAO) have been used as effective...
Unit commitment, as one of the most important control processes in power systems, has been studied extensively in the past decades. Usually, the goal of unit commitment is to reduce as much production cost as possible while guaranteeing the power supply operated with a high reliability. However, system operators encounter increasing difficulties to achieve an optimal scheduling due to the challenges...
Risk management of engineering project is a complicated uncertainty problem. Based on the theory of set pair analysis (SPA), stochastic simulation of triangular fuzzy numbers, herein, a novel analysis model for the project risk management was discussed. A concept of multi-element connection number of the set pair was introduced to express the hierarchy and fuzziness of membership between the evaluation...
In view of system reliable multi-objective optimization design question which the conventional optimization method were mutually contradictory attribute and difficulty, It proposed multi-objective fuzzy reliability optimization decision method based on genetic algorithm and non-probability distribution information. The method used fuzzy set membership function characteristic to reflect objective function...
The risk evaluation of shrink and expansion of the expansive soil is essential to evaluate properly the engineering stability and safety. Herein a novel risk model for the analysis of the grade of shrink and expansion for the expansive soil was discussed by means of coupling set pair analysis with stochastic simulation of triangular fuzzy numbers. A concept of multi-element connection number of the...
One of the greatest concerns for urban residents has been the reliability of transit system and hence, studies undertaken in this regard is of great importance to upgrading the level of service of public transportation systems. In view of the characteristics of urban transit system, this paper analyzes the major factors affecting the reliability of urban transit system. With the purpose of conducting...
Fuzzy travel time reliability on road network is presented in the paper, which shows travelers' expected travel time and tolerance to delay by membership function. In virtue of the stochastic users' equilibrium model, the fuzzy travel time reliability is obtained under day-to-day variations in travel demand. A scenario-based analysis method is proposed to estimate the probability of a path travel...
The problem of maximum multi-reliabilities is studied aiming to the network structures. Firstly, the optimum model of network structures based on random and fuzzy chances constrained is given. The solution strategy of genetic-ant colonies algorithm with stochastic simulation and fuzzy simulated is studied, and the detailed steps of hybrid intelligence are given based on stochastic simulation and fuzzy...
Reliability assessment of power systems is very vital particularly in the market-driven environment. As the power systems are nonlinear and large-scale systems, extracting their reliability indices involves much uncertainty. Calculation of power system reliability using stochastic methods is a complex and relatively difficult procedure. However, using fuzzy logic methods it would be possible to calculate...
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