Abstract:

 Most artificial surfaces generated by the existing fractal surface generation algorithms are isotropic,which are different from most anisotropic mechanical surfaces.In order to solve this problem,the existing anisotropic surface generation methods are reviewed and the morphology of the anisotropic fractal surface generated by the method of frequency domain stretching is analyzed.Then,the method is improved by introducing an angle parameter in the frequency domain,which makes the direction of anisotropy controllable.Experimental results indicate that the surface obtained by the improved method is obviously anisotropic,that the fractal dimension of the extracted profile depends on the stretch radio,and that the surface filtering can be implemented by controlling the frequency component of the extracted profile,which makes the multi- scale resolution possible.Moreover,according to the anisotropy of the ploughed micro- groove's surface,the profiles are scanned by a surface coarseness profiling instrument Talysurf CLI 1000,and the fractal feature of the micro- groove surface is analyzed,based on which a geometrical model of ploughed micro- groove is established via the secondary development of AutoCAD.

Key words: surface morphology, fractal, anisotropy, frequency domain stretching, multiple scale