Aeroacoustic Optimization Design of the Middle and Upper Part of Pantograph

The pantograph is the main noise source of high-speed trains, which middle and upper parts account for about 50% whole energy. Taking CRH380BL as basic prototype, three aerodynamic reduction measures opening, slotting, airfoil are introduced to build a new pantograph, their aeroacoustic performances comprehensively investigated through large eddy simulation (LES) Ffowcs Williams–Hawkings (FW-H) equation method. research results show that open lower arms (ULA) can reduce downstream vorticity intensity vortex structure scale, in turn reduces intensity, thus reducing radiated by approximately 1.1 dBA. slotted ULA size rear but increase so it difficult effectively control noise. bow head scale behind it, avoids periodic shedding, thereby its 1.2