General divergent stability conditions of dynamic systems

Abstract: New necessary and sufficient conditions are proposed for the stability investigation of dynamical systems using the flow and the divergence of the phase vector velocity. The obtained conditions generalize the well-known results of V.P. Zhukov and A. Rantzer. The relation of Lyapunov methods with the proposed methods is established. The application of the obtained results to study the stability of linear systems goes to the problem of matrix inequality solvability. The new control laws are synthesized for linear and nonlinear systems. Examples illustrate the applicability of the proposed method and show the comparison results with some existing ones.