Health Status Assessment of Metro Switch Machine Based on Real-Time Monitoring Data and Variable Weight Fuzzy Comprehensive Evaluation.

Aiming at the online assessment of the health status of metro ZDJ9 switch machines, a health status assessment method of metro switch machines based on real-time monitoring data and variable weight fuzzy comprehensive evaluation is proposed. Firstly, considering the electrical and mechanical characteristics and the external environment of the ZDJ9 switch machine during operation, a hierarchical evaluation index system for health status is established. Secondly, the constant weight of the switch machine evaluation index is determined based on the AHP and the weight is modified according to the relative deterioration degree of the index monitoring data based on the variable weight theory. Finally, the health status is divided into 4 levels, and the membership degree of the index monitoring data to each health level is calculated by the established membership function, and then a hierarchical evaluation model of the switch machine health status based on fuzzy comprehensive evaluation is constructed. Taking the monitoring data of the switch machine of a certain line of Chengdu Metro as an example, the method is verified and compared with the constant weight evaluation method. The results show that, for the serious deterioration of the indicators, the evaluation results of the constant weight method show that the switch machine is still in a "healthy" state, while the evaluation results of the method in this paper are more sensitive to the changes of the index data, and the evaluation result of the health state is "severe", which accords with the actual health condition and can provide the theoretical basis for condition-based maintenance. [ABSTRACT FROM AUTHOR]