Numerical Comparison in Aerodynamic Drag and Noise of High-Speed Pantographs with or without Platform Sinking

Flat roofs and platform sinking are two common installation configurations for high-speed pantographs. The cavity formed by the is a potential source of aerodynamic drag noise. In this paper, shape rectangular optimized, performance pantograph with or without compared discussed based on optimized results. flow field sound propagation predicted improved delayed detached eddy simulation (IDDES) method FW-H equation. results show that produces largest radiation upstream, downstream, bottom surfaces can be rounded sloped edges to reduce unstable shear recirculation zone separation reattachment reduced modifying upstream downstream cavity. addition, vortex in front surface even eliminated surface. When (R/H = 0.8), better. Compared installed flat roof, noise significantly due shielding lower structure cavity, total 5.22% 1.45 dBA, respectively.