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)...

The trend in the industrial power electronics electrical drives is to reach high density and efficiency variable load conditions at cost-effective unwasteful designs. Currently, motors with permanent magnets (such as IPMSM PMaSynRM) are of great interest because compactness, low losses, high-torque capability. performance a drive system can be predicted motor electromagnetic authentic nonlinear...

Linear alternators work seamlessly with Free-Piston Stirling Engines (FPSE) in the energy conversion process. This research concentrates on design and development of a tubular slot-spaced Permanent Magnet Alternator (PMLA) to be coupled FPSE. In an attempt increase power density machine over conventional PMLAs, slot space is added reduce total mass stator parametrical study carried out for same...

Abstract In several online retail contexts, such as grocery retailing, customers have to be present at the moment of delivery, that is, an attended home delivery service is in place. This requirement adds new challenges this channel, often leading narrow profitability. From operations perspective, performed with retailer offering multiple time slots for customer choose from. Retailers target a ...

The printed circuit heat exchanger (PCHE) plays a vital role in the supercritical CO2 cooling system for hypersonic aircraft, which significantly affects efficiency and stability of system. In this study, novel structure is proposed to improve overall performance airfoil fin PCHE. RP-3 aviation kerosene SCO2 are used as working fluids study thermal-hydraulic enhancement mechanism. results indic...