Abstract Tracking of reference signals is addressed in the context a class nonlinear controlled systems modelled by r -th-order functional differential equations, encompassing inter alia with unknown “control direction” and dead-zone input effects. A control structure developed which ensures that, for every member underlying system admissible signal, tracking error evolves prescribed funnel cho...

A class of Kirchhoff type systems with nonlinear boundary conditions considered in this paper. By using the method of Nehari manifold, it is proved that the system possesses two nontrivial nonnegative solutions if the parameters are small enough.