文摘
In this paper we consider an envelope function for the multi-dimensional bichromatic wave defined by a Fourier transformation and show that it satisfies a kind of Ginzburg–Landau equation under some conditions for the spectrum function and the angular function . The result is an extension of Nohara’s work [B.T. Nohara, Derivation and consideration of governing equations of envelope surface created by directional, nearly monochromatic waves, International Journal of Nonlinear Dynamics and Chaos in Engineering Systems 31 (4) (2003) 375–392; B.T. Nohara, Governing equations of envelope surface created by directional, nearly monochromatic waves, Journal of Japan Society of Industrial and Applied Mathematics 13 (2) (2003) 213–224 (in Japanese)] which treated one-dimensional wave functions.