Design And Reliability Analysis Of Performance Test Bench For High Speed EMU Radiator

In order to promote the construction of the "Belt and Road" and.accelerate regional economic prosperity and industrial cooperation,it is necessary to improve the stability of the rail transit vehicle system on the basis of continuously accelerating transportation efficiency.The AC-DC conversion inverter module of the modern high-speed EMU adopts the micro-circulation phase-change finned radiator as a heat sink,which plays an important role in the cooling system of the high-speed EMU.This paper presents the overall design and reliability analysis of the high-speed EMU radiator performance test and the factory inspection test bench.The following design,analysis and optimization were carried out for the design and reliability of the high-speed EMU radiator test bench.First of all,this paper carried out system layout design,electrical principle design,air duct structure design,flow detection component selection and flexible heat transfer platform design for the test bench.Secondly,based on the finite volume method and computational fluid dynamics theory,the influence of air duct structure and wind source layout on the air flow velocity in the test bed flow field was studied using numerical simulation software FLUENT.The inlet air supply and outlet exhaust were analyzed by orthogonal test method.The synergistic effect of the flow field and its influence law have obtained the theoretical basis of the wind source layout scheme.Finally,the fault tree analysis method is used to analyze the reliability of the test bed system.The focus is on modeling and analyzing the fault events and basic events of the radiator.For the weak links and phenomena such as thermocouple over-temperature and leakage,the test bench scheme was optimized by isolating the thermocouple from the bottom of the radiator and adding a thermal pad.The feasibility of the optimized test bench scheme was verified by finite element method and thermodynamic theory.System design,local analysis optimization and system reliability analysis were carried out on the high-speed EMU radiator performance test bench.The performance and reliability of the test bench are ensured.At the same time,relevant theories and research results have certain reference significance to the influence mechanism of the flow velocity of the typical structure flow field and the reliability analysis and optimization of similar test benches.