Study On The Evaluation Index Of The Current Collecting Quality Of The Third-rail Power Supply System

The subway bears the important task of urban rail transit.As a high-density,large-capacity,fast-time transportation,it has extremely high requirements on the stability and safety of the current collection system.Ensuring good quality of collecting not only improves ride comfort and operational safety,reduces failure rates and maintenance costs,but also creates great economic benefits.The movement of the slider slide along the contact rail is a complex mechanical and electrical process,but the mechanical effects play a leading role.Based on GB/T32589-2016 "Railway application-Third-rail current collector" and the third rail power supply system research status has two important conclusions:Slider and third-rail dynamic collecting characteristics are key technical issues affecting the reliability of power supply system;The dynamic wear of slider and the third-rail is an important factor affecting the maintenance cost of the subway vehicle.Therefore,the dynamic collecting performance of third-rail power supply system and the wear of the slider are related to the efficiency,safety and economic benefits of train operation and must be regulated.This paper starts with the micro-morphology of the slider and the third-rail surface,and analyzes the current-carrying friction and wear mechanism of the two at the contact surface and the influence of the contact force on the slider and the third-rail wear;Reveals the mechanism of off-line are generation and its impact on power supply performance;The main exciting factors that cause the contact force fluctuation and mechanical detachment between slider and the third-rail are studied.Based on the quality standards of the bow network and the experience of domestic subway operation,after two rounds of index screening and screening results verification,four first-level evaluation indicators of contact pressure,off-line,end elbow vibration shock,slider wear and twelve secondary indicators were established.From the perspective of experiment and simulation,the methods for obtaining each index are studied separately.Combined with the experimental and simulation data,the evaluation indicators are quantitatively analyzed and the recommended eligibility criteria are proposed.According to the difference of the characteristics of the evaluation indicators,the analytic hierarchy process and the preference ratio method are used to weight the first-level qualitative indicators,and the coefficient of variation and the method of opening the grades are used to weight the second-level quantitative indicators.Finally,the combination of the squares based on the sum of the deviations is used.Based on the opinions of comprehensive university experts and subway maintenance experts,a method for classifying the quality of the flow is proposed.Based on the theory of attribute theory,the evaluation set,confidence and comprehensive score judgment criteria establish a collecting quality evaluation model for the third-rail power supply system.At the same time,in order to make up for the complex,cumbersome calculation and large computational complexity of the collecting quality assessment model established in this paper,the interface quality evaluation of the third-rail power supply system was developed based on MATLAB/GUI.Through three case studies,the feasibility of the evaluation model and the intuitiveness of the evaluation interface are verified,which makes the research content and research results of this paper have importantusevalueandpracticalsignificance.In this paper,there are 77 figures,87 tables,60 refrences.