221 results about "Fuzzy analytic hierarchy process" patented technology

The invention discloses a variable-weight fuzzy comprehensive state evaluation method for relay protection considering variable membership degree. At present, the entropy method is only used to establish the constant weight coefficient, and the historical monitoring data is excessively relied on. At the same time, its linear model can only be evaluated simply, and the weight of the scoring items is fixed, so the accuracy of the evaluation needs to be improved. The present invention adopts the combined constant weight calculation method of the entropy value method and the fuzzy analytic hierarchy process, introduces the variable weight theory at the same time, constructs the penalty-incentive type variable weight function with different amplitudes, and establishes the combined variable weight phasor; combined with the fuzzy discrimination theory , constructed a variable membership function model based on variable coefficients and normal distribution, and considered the dynamic correction of the membership degree fuzzy discrimination matrix, proposed a dynamic correction method for the fuzzy matrix with more obvious effects, and finally selected the weighted average algorithm The sub-calculates the fuzzy evaluation result. The invention can accurately reflect the actual state of the relay protection equipment, and improves the accuracy of evaluating the state of the relay protection.

The invention relates to a bridge hanging basket construction risk assessment method based on a fuzzy analytic hierarchy process. The method comprises the steps that a bridge construction project hanging basket construction safety risk assessment index set is determined; according to expert evaluation opinions, a judgment matrix is obtained through comparison of every two factors, the maximum feature value and weight of the judgment matrix are calculated, and whether consistency of the judgment matrix passes or not is checked; a grade matrix of a single criterion layer is determined by using atrapezoidal membership function, and a primary fuzzy evaluation matrix is obtained via calculation; and finally, a step of comprehensively carrying out secondary fuzzy comprehensive evaluation on themain criterion layer is conducted to obtain a risk evaluation result. The safety condition of the bridge hanging basket construction system is evaluated through the fuzzy hierarchy method, and the method has the advantages of being simple in design, convenient to implement, comprehensive in consideration factor and the like; meanwhile, according to a construction site and a safety system of the construction site, uncertain influence factors causing bridge hanging basket construction accidents can be converted into a model capable of conducting quantitative calculation, and therefore scientific reference is provided for preventing and controlling the hanging basket construction accidents.