Sufficient conditions for oscillatority in the sense of Yakubovich for a class of time delay nonlinear systems are proposed. Under proposed conditions, upper and lower bounds for oscillation amplitude are given. Examples illustrating analytical results by computer simulation are presented.
Denis V. Efimov. Alexander L. Fradkov. "Oscillatority Conditions for Nonlinear Systems with Delay." J. Appl. Math. 2007 1 - 12, 2007. https://doi.org/10.1155/2007/72561