SPECTRAL ANALYSIS OF METALLIC SURFACES TOPOGRAPHY GENERATED BY ABRASIVE WATERJET

• Published in: Tehnički vjesnik Vol. 19; no. 1; pp. 1 - 9
• Main Authors: Brillova, K, Ohlidal, M, Valicek, J, Kozak, D, Hloch, S, Zelenak, M, Harnicarova, M, Hlavacek, P
• Format: Journal Article
• Language: English
• Published: 01-03-2012
• Subjects: Abrasive cutting; Cutting; Cutting parameters; Density; Distortion; Spectra; Topography
• ISSN: 1330-3651

A basic study of a surface topography generated by an abrasive waterjet cutting is performed by means of the spectral analysis of these surfaces. The initial data were acquired by using an optical profilometer MicroProf FRT in the form of 2D maps of the surfaces' heights. The basic notions of the spectral analysis applied to the surface topography are presented. Limitations of the measurement procedure are considered. Distortions of the areal power spectral density are discussed. An estimation of the areal power spectral density is carried out using a periodogram method combined with the Welch's method. A comparison of surfaces prepared by the abrasive waterjet cutting with different values of the cutting technological parameters is performed. It has been demonstrated that the areal spectral analysis of the aforementioned surfaces offers new possibilities of their topography characterization.Original Abstract: Osnovna studija topografije povrsina nastalih rezanjem abrazivnim vodenim mlazom izradena je uz pomoc spektralne analize tih povrsina. Pocetni podatci su prikupljeni primjenom optickog profilometra MicroProf FRT u obliku 2D karata visina povrsina. U radu se predstavljeni osnovni pojmovi spektralne analize primijenjeni na topografiju povrsine. Razmotrena su ogranicenja postupka mjerenja. Raspravljena su iskrivljavanja povrsinske gustoce spektra snage. Procjena povrsinske gustoce spektra snage je obavljena pomocu metode periodograma u kombinaciji s Welchovom metodom. Usporedene su povrsine dobivene rezanjem pomocu abrazivnog vodenog mlaza uz razlicite vrijednosti tehnoloskih parametara rezanja. Pokazano je da se spektralnom analizom navedenih povrsina nude nove mogucnosti karakterizacije njihove topografije.