Study On Fuzzy Comprehensive Evaluation Model Of Intelligent Elevator Safety Based On Extension Theory

With the development of social economy and the improvement of people's living condition,elevator has become an indispensable tool because of its fast and convenient features.But the safety problem caused by elevator has brought great threat to people's life and property security,which aroused wide concern of the society.Therefore,developing the research of elevator safety evaluation is very important to engineering value and social significance.The research mainly include the following three aspects:(1)The research of elevator safety evaluation index system.According to the operation data of elevator and the existing research results,we used the analytic hierarchy process to determine the multi-level structure of elevator safety evaluation index system.And both expert scoring method and entropy weight method were used to calculate the weight of index system,then the weight was combined by the integrated optimal method,which to obtain the optimal weight of each index.Finally,in order to identify and eliminate the weak weight index,we used the interval estimation and mathematical programming method,so as to optimize the index system.(2)The research of elevator safety evaluation methods.Firstly,the safety grade of whole elevator system and each index were divided,and the evaluation index is treated with corresponding membership degree.Because of the complexity and fuzziness of elevator system,we used the fuzzy mathematics and extension method,combining the matter-element theory.Then we used the correlation function to depict each index's security state.Finally,according to the multi-level structure of the index system,we established an extension fuzzy comprehensive evaluation model for elevator safety.(3)Example analysis of elevator safety evaluation methods.Based on the safety evaluation model established in this paper,we took operation data of elevator in M city for instance analysis.In order to calculate conveniently,we used MATLAB to establish safety evaluation program.The results show that the safety evaluation method is convenient and operable,and it is direct and effective.