  We study a topological physics in a one-dimensional nonlinear system by
taking an instance of a mechanical rotator model with alternating spring
constants. This nonlinear model is smoothly connected to an acoustic model
described by the Su-Schrieffer-Heeger model in the linear limit. We numerically
show that quench dynamics of the kinetic and potential energies for the
nonlinear model is well understood in terms of the topological and trivial
phases defined in the associated linearized model. It indicates
phenomenologically the emergence of the edge state in the topological phase
even for the nonlinear system, which may be the bulk-edge correspondence in
nonlinear system.
