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作 者:周鹏飞 蒙贺伟[1,2,3] 梁荣庆 张炳成[1] 坎杂 Zhou Pengfei;Meng Hewei;Liang Rongqing;Zhang Bingcheng;Kan Za(School of Mechanical and Electrical Engineering,Shihezi University,Shihezi,832000,China;Key Laboratory of Northwest Agricultural Equipment,Ministry of Agriculture and Rural Affairs,Shihezi,832000,China;Research Center of Agricultural Mechanization for Economic Crop in Oasis,Ministry of Education,Shihezi,832000,China)
机构地区:[1]石河子大学机械电气工程学院,新疆石河子832000 [2]农业农村部西北农业装备重点实验室,新疆石河子832000 [3]绿洲特色经济作物生产机械化教育部工程研究中心,新疆石河子832000
出 处:《中国农机化学报》2023年第5期214-222,共9页Journal of Chinese Agricultural Mechanization
基 金:兵团重大科技项目(2018AA001—4);南疆重点产业创新发展支撑计划(2020DB008)。
摘 要:为准确快速获取新疆棉田机收膜杂中土壤颗粒的动态休止角,结合基于OpenCV-Python的计算机图像处理技术,搭建土壤动态休止角测量装置。为保证动态休止角测量的准确性,利用三维块匹配滤波算法对采集图像进行降噪处理,图像降噪前后的峰值信噪比为36.48 dB,结构相似指数为0.88;采用Canny算法提取土壤边界并通过改进的最小二乘法求解土壤边界拟合方程,获取土壤颗粒的动态休止角。依据该方法测定不同转速下土壤颗粒的动态休止角,分析转速对动态休止角的影响规律,分别构建线性拟合模型和多项式拟合模型。通过方差分析可知,多项式拟合模型拟合度较高,该模型R^(2)为95.72%,均方差为0.061。在此基础上优化求解,得到土壤动态休止角最优测量转速为7 r/min。本研究采用的土壤动态休止角测量装置精度和准确性较高,其结果可为土壤流动特性的研究及土壤筛分、输送等机具的开发设计提供参考。This study aims to accurately and quickly obtain the dynamic angle of repose of the soil particles in residual film mixture in Xinjiang cotton fields by combing computer image processing technology based on OpenCV-Python and building a measuring device.To ensure the measurement accuracy of the dynamic angle of repose of soil particles,a three-dimensional block matching filtering algorithm was used to denoise the image.The peak signal-to-noise ratio of the denoised image is 36.48 dB,and the structural similarity index of the denoised image is 0.88.The Canny algorithm was used to extract the soil boundary,and the soil boundary fitting equation was solved by an improved least square method to obtain the dynamic angle of repose of the soil particles.This method was used to measure the dynamic angle of repose of the soil particles under different rotating speeds,and the influence law of different rotating speeds on the dynamic repose angle was analyzed.Linear and polynomial fitting model were constructed,and the polynomial fit model showed a better fit according to analysis of variance.The correlation coefficient R^(2)of the model was 95.72%,and the mean square deviation was 0.061.The optimal rotational speed of the dynamic angle of repose of soil particles was determined to be 7 r/min.The precision and accuracy of the dynamic angle of repose of soil particles obtained in this study were high,providing a reference for the study of soil flow characteristics and the development and design of soil screening and conveying machines.
关 键 词:土壤颗粒 动态休止角 图像处理技术 最小二乘法 OpenCV-Python
分 类 号:S126[农业科学—农业基础科学]
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