Study on fuzzy integrated assessment method for safety level of traction elevators and its application

To assess the safety level of traction elevator and reduce its risk probability,a fuzzy integrated security evaluation method on elevator was proposed according to its characteristics in use and operation.Man,machine,environment and management were all taken into account to establish the safety assessment index system of elevator.The eigenvector method and range estimation priority theory were integrated to calculate weight while screening index.By introducing the fuzzy integrated assessment method,the evaluation vector with randomness and fuzziness was quantified,which is the divide of 5 levels of safety assessment grades.Application results of 102 old elevators in Nanjing showed that old elevators in old urban districts were in serious potential safety risk and poor condition,which coincided with the actual situation.Fuzzy integrated assessment method can accurately reflect and measure the elevator safety performance,which is of great value for elevator safety assessment.