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 Posted: Thu 22:32, 09 Dec 2010 Post subject: ugg italia Three-dimensional surface topography of |
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Three-dimensional surface topography of the two-dimensional Power Spectrum
Rate of size, location and does not provide direction. If the surface has a cross-texture, that is, surface orientation, its APSD also has a direction (Figure 3 (b)); cross angle between the texture, by the angular spectrum of the two largest peaks to determine, from Figure 3 (d) knowledge about 3ff and 15 in both directions. For isotropic random surface, such as the EDM surface (Figure 4 (a)), the APSD energy is approximately evenly distributed in a circle on the frequency axis around the origin. Angular spectrum did not show any structural information. However, the radius of the spectrum is the improvement of one-dimensional spectrum estimation, the average spectrum of all directions. l4 Measurement of January 2004 00 (a) surface morphology (c) radius of the spectrum Omml8O (b) two-dimensional power spectrum 9O. 10000I. Figure 2 tm grinding surface topography and power spectra (a) surface morphology (c) radius of the spectrum Oum2270. (D) angular spectrum ---- LI_40. In-408 (b) two-dimensional power spectrum 90. 4OOO snapped Figure 3 ground surface topography and power spectra of 270. (D) Angular Spectrum 25 No. 1 ASTRONAUTIC: Three-dimensional surface topography snapped a two-dimensional Power Spectrum 2 (a) surface morphology (c) radius of the spectrum 3. Omml8O2 (b) two-dimensional power spectrum 90. 2000itrn ~ 270 (d) 4 EDM angular spectrum of surface topography and power spectra In addition, because the sampling area in two perpendicular directions is split, andpowerspectrumforweal-particleanalysis [J] . Tribology of the frequency axis in two orthogonal frequency components introduced artificially, which International, 1997,[link widoczny dla zalogowanych],30 ( :583-590. The so-called Gibbs phenomenon. This can be from Figure 4 (d) of the isotropic [3] SherringtonI, SmithEH ・ Fouriermodelsofhesurface random surface of 0. And 90. Observed angular spectrum. mpograp \lJJ ・ SurJaceTopography,[link widoczny dla zalogowanych], 1988,[link widoczny dla zalogowanych], (1) :11-25 .4 conclusions can be seen from the above experimental analysis, two-dimensional power spectrum (including the radius of the spectrum and angular spectrum) can qualitatively describe the structure and direction of surface texture, different processing methods two-dimensional surface of the power spectrum has a distinct difference. Angular spectrum reveals a different direction, all the spatial frequency spectrum of the total energy; radius of the spectrum are reflected in all directions, the different spatial frequency components of the spectral energy distribution. [2 [References] BrighanmEO. TilefastFrouiertransformanditsapplications [M]. EnglewoodCliffs, NJ: Prentice-Hall, 1988. PengZ,[link widoczny dla zalogowanych], KirkTB. Two-dimensionalfastFouriertransform [4] \1995,[link widoczny dla zalogowanych],1209:381-391. [6] ThomasTR.RoughSurface [M]. NewYork: LongmanPress, 1982 [7] Longuet-HigginsMS.Thestatisticalanalysisofrandommovingsurface [R]. London: PhilosTransRSoc.1957.321-387.
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