Abstract: Stability of second-order dynamical systems with time lag is investigated by using Pontrjagin’s theorems on the zeros of exponential polynomials. The time-lag term may involve the displacement, ...

Abstract: Stability criteria for second-order dynamical systems with time lag are presented here in a simple chart form. The results cover negative as well as positive values of the parameters. These ...

Abstract: This paper presents methods for determining the exact solutions of certain two-degree-of-freedom nonlinear systems with high-degree polynomial restoring forces. The exact solutions are the normal ...