Kriterij za objektivno određivanje vrijednosti praga osjetljivosti pri filtriranju signala hrapavosti strojno obrađene površine masivnog drva filtrom utemeljenim na brzoj Fourierovoj transformaciji (FFT)

IF 0.7 4区农林科学 Q4 MATERIALS SCIENCE, PAPER & WOOD

Drvna Industrija Pub Date : 2023-09-29 DOI:10.5552/drvind.2023.0088

Igor Đukić, Juraj Jovanović, Ivica Župčić, Matija Jug

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Abstract

The article presents the method for an objective determination of threshold value, needed for filtering out the anatomical roughness signal, with filter based on fast Fourier Transform (FFT), from surface roughness profile after machining. The method includes experimental preparation of solid wood surface by cutting in such a way to get a surface that can be considered to represent only anatomical roughness, with no other influence. Experiments were performed on radial cross section of solid oak wood (Quercus robur L.) so that the results could be compared with roughness profiles that were previously obtained in experiments after sawing with circular saw. From these samples and based on frequency analysis of anatomical roughness signals, the threshold value was determined to be 1.6 μm. The average value of Ra parameter of anatomical roughness for specimens of radial cross section of solid oak wood was 2.1 μm with standard deviation of 0.3 μm. The importance of choosing adequate sampling length in threshold determination, based on frequency analysis of anatomical roughness signal, was also established.

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用于过滤粗糙度信号的阈值傅立叶变换（FFT）表面滤波器

本文提出了一种基于快速傅立叶变换(FFT)的滤波方法，用于客观确定加工后表面粗糙度轮廓中解剖粗糙度信号的阈值。该方法包括通过切割对实木表面进行实验制备，以获得可以认为仅代表解剖粗糙度而不受其他影响的表面。在实心橡木(Quercus robur L.)径向截面上进行了实验，以便与之前用圆锯锯切后的实验结果进行比较。从这些样本中，根据解剖粗糙度信号的频率分析，确定阈值为1.6 μm。实木径向截面解剖粗糙度Ra参数均值为2.1 μ m，标准差为0.3 μ m。基于解剖粗糙度信号的频率分析，确定阈值时选择合适的采样长度的重要性。

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来源期刊

Drvna Industrija MATERIALS SCIENCE, PAPER & WOOD-

CiteScore

1.80

自引率

9.10%

发文量

审稿时长

>12 weeks

期刊介绍： "Drvna industrija" ("Wood Industry") journal publishes original scientific and review papers, short notes, professional papers, conference papers, reports, professional information, bibliographical and survey articles and general notes relating to the forestry exploitation, biology, chemistry, physics and technology of wood, pulp and paper and wood components, including production, management and marketing aspects in the woodworking industry.