TY JOUR TI MECHANICS OF OSCILLATIONS IN DIFFERENTIAL EQUATIONS KW vibrating system KW sprung mass KW differential equation KW coefficient of elastic resistance JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Moroz, N.A. AU Shiroukhov, A.V. PY 2017 IS 2017 PB Saint-Petersburg University of State Fire Service of Emercom of Russia