TY JOUR TI APPLICATION OF THE MODAL APPROACH TO THE CONSTRUCTION OF THERMAL CHARACTERISTICS OF MACHINES OPERATING IN COMPLEX MODE KW thermal characteristics of the machine KW thermal error KW experimental modal analysis KW simulation JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Polyakov, A.N. AU Nikitina, I.P. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov