Steady solitary wave solutions of the generalized sixth-order Boussinesq–Ostrovsky equation

An overview of models that lead to the nonintegrable Ostrovsky equation and its generalizations having no exact solitary-wave solutions is given. A brief derivation of the Ostrovsky equation for longitudinal waves in a geometrically nonlinear rod lying on an elastic foundation is performed. It is shown that in the case of axially symmetric propagation of longitudinal waves in a physically nonlinear cylindrical shell interacting with a nonlinear elastic medium the displacement component obeys the generalized sixth-order Boussinesq–Ostrovsky equation. We construct an exact kink-like solution of this equation, establish a connection with the generalized nonlinear Schrödinger (GNLS) equation and find the steady travelling wave solution of the GNLS in the form of simple soliton with monotonic or oscillating tails.