AS型地铁车辆制动系统健康状态评估研究OA

To address performance degradation and effectively assess health status of the braking system of AS-type metro vehicles,this paper integrates the Bayesian Network(BN)with the Analytic Hierarchy Process(AHP)model for combined weighting.By building a five-level health status evaluation system for the braking system and employing the trapezoidal membership function to quantify the fuzzy mapping relationship between the failure rate index and the health grade,the health status of the braking system of AS-type metro vehicles is assessed based on the fuzzy comprehensive evaluation method.Through the sensitivity analysis of braking system faults by the BN model,results show the nodes with relatively high sensitivity are obtained,such as the fracture of the grinding medium back plate and the wear of the grinding medium,which require full attention in daily maintenance.An analysis of the health status of the component layer suggests the health status of the basic braking device and the air compressor is more important than that of the braking control device,followed by that of the tread cleaner.Thus,the braking system should be maintained in this order.With the maximum membership degree of the braking system of the AS-type metro vehicle available and its health status evaluated available,the possibility of failure is average.But,it should not be used for long as it requires close tracking.The weight determination method based on BN-AHP reduces the influence of subjective human factors,creating more proper distribution of weight results.The research may provide a quantitative decision-making basis for the preventive maintenance of AS-type metro vehicles.