Influence of Magnetorheological Fluids Thermostability Characteristics on the Damping Performance in Oscillatory Systems

In order to extend the temperature range for the use of magnetorheological fluids (MRFs) in viscous friction dampers of vibrational systems of various objects, the influence of the complex dispersed phase in its composition (ferromagnetic and ferrimagnetic particles of different morphology and magnetization) on the magnitude and stability of their characteristics under the influence of an external magnetic field is determined. MRF sample containing a small additive of nanosized needle-shaped zinc oxide iron particles in a magnetic field has the smallest change in shear resistance in the temperature range from 10 to 60°C. The process of damping the natural and forced vibrations of an object in a single-mass oscillatory system with a controlled magnetorheological damping device is investigated. The logarithmic damping decrement of natural oscillations increased by 2.5 times, the amplitude of the forced oscillations decreased by more than four times in a magnetic field.