Reliability Analysis for the Equal Vavle Used in Shanghai Metro Line 1 DA01 Vehicles
|School||Shanghai Jiaotong University|
|Keywords||Balanced valve Reliability Analysis Reliability model Failure modes and effects criticality analysis Fault Tree Analysis|
Countries in the world in the design of a subway train braking system , the general air brake as a safety brake . Shanghai Metro Line the DA01 -type train air brake system is commonly used brake fast brake and emergency brake 3 branch , and its working principle is to get the wind source air supply unit from the train , according to their respective control mode control pressure signal , amplified by the equalizer valve flow type foundation brake , implemented by the foundation brake brake . Three kinds of brake must be balanced valve flow amplification and equalization valve must pass through the channel . For each section for a vehicle , the brake control unit and the foundation brake in the structure are redundant , but only one equalizer valve , therefore affecting the reliability of the system for the braking system, the equalization valve become key components must its reliability . Firstly, analysis of the overall structure of the equalizer valve , its feature division , and gives a functional block diagram of the entire valve and reliability of a block diagram , to establish the reliability of the valve model . Then follow the functional partitioning of the various components of a balanced valve failure analysis , with the failure modes and effects and criticality analysis balanced valve parts are numbered , single point of failure to identify its components may occur , listed the failure mode probability of occurrence of grade and hazardous level accordingly drawing dangers matrix ; With the fault tree analysis of a balanced valve failure logical segmentation, to identify the minimal cut set of the top event , a combination of the type of fault analysis of the causes of valve failure , and through quantitative calculation to determine the reliability index of the valve . Papers on domestic braking system balancing valve reliability test , test its reliability verification , balanced valve life curve distribution patterns , and the results are extended to all types of valve train braking system . Reliability analysis based on exploring balanced valve repair and protection . Estimate the average service life of the valve through the valve the positive train line operators in the frequency of use , and maintenance of reasonable configuration , according to the regulations of repairs .