TY JOUR TI COMPUTER SIMULATION OF ALTERNATING-CONSTANT CURRENT ELECTRIC DRIVE FOR MAINLINE LOCOMOTIVES KW direct current traction motor KW series excitation KW SimInTech KW diesel engine KW synchronous generator KW uncontrolled rectifier JO Automation and modeling in design and management AU Gavrilov, E.S. AU Pugachev, A.A. PY 2026 IS 2026 PB Bryansk State Technical University