Asymptotic stabilization of a system of coupled $n$th--order differential equations with potentially unbounded high-frequency oscillating perturbations

This paper deals with an analysis and design of robust, state-feedback control law uniform-asymptotically stabilizing at origin the system consisting of coupled $n$th–order ordinary differential equations in the presence of a non-vanishing at $x=0$ or even unbounded on the time interval $[0,\mathrm{\infty })$ time-varying high-frequency oscillating perturbation $w(t,x)\mathrm{.}$ The obtained results generalize and extend some known and now classical results in the control theory for a wider class of perturbations. Moreover, as is shown in the paper, there is no room for further generalization for $w$ which is time-dependent only, $w=w(t)\mathrm{.}$