TY JOUR TI DETECTION OF NATURAL OSCILLATION FREQUENCIES AND COEFFICIENTS OF RELATIVE DAMPING OF DYNAMIC SYSTEM AT MILLING BY METHOD OF OPERATION MODAL ANALYSIS KW JO Bulletin of Bryansk state technical university AU Kravchenko, K.Y. AU Kugaevskiy, S.S. AU Zhuravlev, M.P. AU El'kind, D.M. PY 2017 IS 2017 PB Bryansk State Technical University