Machinery & Energetics

The terms of change mechanical energy are considered at determination of descriptions of autoswaying motion of the mechanical system. Power correlations are analyzed in the case of self-excited oscillations with soft and rigid self-excitation. Position of points of static and dynamic equilibrium of the autoswaying systems is found out on graphic dependences of change of mechanical energy of the system on amplitude of its fluctuating motion. Character of steady or unsteady static and dynamic equilibrium of the autoswaying systems is certain at necessary initial conditions. It is rotined that the mode of steady vibrations with eventual amplitude is possible only in the autoswaying systems with nonlinear properties. The task of prognostication of origin of steady autoswaying motions to decide in the linear raising is offered. Steady self-excited oscillations of the mechanical system are considered with a viscidlyresilient element in an environment with resistance, which can be presented as free vibrations of the nonlinear mechanical system.

self-excited oscillations, mechanical energy of the system, static and dynamic equilibrium, stability of vibrations