[IEEE 2017 14th International Conference The Experience of Designing and Application of CAD Systems in Microelectronics (CADSM) - Lviv - Polyana, Ukraine (2017.2.21-2017.2.25)] 2017 14th International Conference The Experience of Designing and Application of CAD Systems in Microelectronics (CADSM) - Investigation of the mathematical model of bending oscillations of the oil tanks' walls in the transformers considering nonlinear dissipative forces