Nonlinear Wave Equation with Damping: Periodic Forcing and Non-Resonant   Solutions to the Kuznetsov Equation
  Existence of non-resonant solutions of time-periodic type are established for the Kuznetsov equation with a periodic forcing term. The equation is considered in a three-dimensional whole-space, half-space and bounded domain, and with both non-homogeneous Dirichlet and Neumann boundary values. A method based on Lp estimates of the corresponding linearization, namely the wave equation with Kelvin-Voigt damping, is employed. 
Aday Celik, Mads Kyed
math.AP