利用椭圆傅里叶描述子检测扁平扇形喷管孔口形状制造缺陷

4区 农林科学
B. Sayıncı
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引用次数: 3

摘要

平面扇形喷嘴的孔口开口制造过程中产生的形状缺陷可能导致喷雾形状的恶化。本研究的目的是利用椭圆傅里叶描述子(EFDs)检测扇形喷嘴孔在形状均匀性方面的制造缺陷,并揭示在01至06不同标称尺寸的聚缩醛喷嘴孔之间的形状差异。首先,利用图像处理方法获得了描述喷管孔口尺寸(长短、投影面积等)和形状(形状因子、伸长率和圆度)的描述性数据。接下来,利用椭圆傅里叶分析(EFA)对喷管孔口形状进行评价,分别进行了孔口轮廓数据的生成、efd的推导、efd的主成分分析(PCA)和主成分评分(pc)估计的形状变化的可视化。虽然可以直观地区分孔口轮廓的形状差异,但描述性形状数据不能区分轮廓差异。对每个喷嘴孔尺寸确定的efd可以单独检测出由制造引起的形状缺陷,并且可以与散点图明确区分。Hotelling’s两两对比试验结果表明,喷嘴孔的形状存在显著差异。线性判别分析表明,03、04和06孔的群质心接近。与其他孔相比,01的矩形孔具有非凡的属性。015的孔口轮廓呈扁椭圆形,外形光滑。发现02尺寸的喷嘴孔的轮廓明显不同于其他尺寸。结果表明,该方法可用于生产厂家检测和提高喷嘴孔的质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detection of Shape Manufacturing Defects of Flat Fan-Pattern Nozzle Orifices Using Elliptic Fourier Descriptors
Shape defects originating from the manufacture in the orifice openings of the flat fan-pattern nozzles may result in deteriorating the spray pattern. This study has been conducted with the aim of detecting the manufacturing defects of the fan-pattern nozzle orifices in terms of shape uniformity using the elliptic Fourier descriptors (EFDs), and revealing the shape differences among the nozzle orifices made in polyacetal for various nominal sizes ranging from 01 to 06. At first, descriptive data describing dimensions (major and minor length, projected area, etc.) and shapes (shape factor, elongation and roundness) of the nozzle orifices were obtained using an image processing method. The next process, to evaluate the nozzles’ orifice shape using elliptic Fourier analysis (EFA), the progresses of generating the orifice’s contour data, derivation of EFDs, principal component analysis (PCA) of EFDs and visualization of shape variations estimated by the principal component scores (PCs) were followed respectively. Although the shape differences of the orifice outlines could be visually distinguished, the descriptive shape data were not able to discriminate the contour differences. The EFDs determined for each orifice size could individually detect the nozzle orifices with shape defect originating from the manufacture and they could be explicitly distinguished from the scatter plots. The results of the Hotelling’s pairwise comparison test showed that the nozzle orifices in shape were significantly different from each other. Linear discriminant analysis demonstrated that the group centroids of the orifices of 03, 04 and 06 were found close-range to each other. The orifice of 01 which is rectangular in shape had an extraordinary attribute compared to the other orifices. The orifice outline of 015 with a smooth shape was in appearance of an oblate ellipse in shape. The contour of the nozzle orifice of 02 size was explicitly found different from the others. It was concluded that the EF method can be used intended for the manufacturers inspect and improve the quality of nozzle orifices.
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来源期刊
CiteScore
1.40
自引率
0.00%
发文量
26
期刊介绍: Journal of Agricultural Sciences (JAS) is an international, double-blind peer-reviewed, open-access journal, published by the Faculty of Agriculture, Ankara University. The journal invites original research papers containing new insight into any aspect of Agricultural Sciences that are not published or not being considered for publication elsewhere. Preliminary, confirmatory or inconclusive research, review articles, case and local studies and works presenting taxonomy will not be published.
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