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Optimal combination of the correction model and parameters for the precision geometric correction of UAV hyperspectral images

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 173-184页

作者： Wenzhong Tian za kan Qingzhan Zhao Ping Jiang Xuewen Wang Hanqing Liu College of Mechanical and Electrical Engineering Shihezi UniversityShihezi 832000XinjiangChina Research Center for Space Information Engineering Technology Shihezi 832000XinjiangChina XPCC Division of National Remote Sensing Center of China Shihezi 832000XinjiangChina College of Information Science and Technology Shihezi UniversityShihezi 832000XinjiangChina

Nowadays,with the rapid development of quantitative remote sensing represented by high-resolution UAV hyperspectral remote sensing observation technology,people have put forward higher requirements for the rapid preprocessing and geometric correction accuracy of hyperspectral *** optimal geometric correction model and parameter combination of UAV hyperspectral images need to be determined to reduce unnecessary waste of time in the preprocessing and provide high-precision data support for the application of UAV hyperspectral *** this study,the geometric correction accuracy under various geometric correction models(including affine transformation model,local triangulation model,polynomial model,direct linear transformation model,and rational function model)and resampling methods(including nearest neighbor resampling method,bilinear interpolation resampling method,and cubic convolution resampling method)were ***,the distribution,number,and accuracy of control points were analyzed based on the control variable method,and precise ground control points(GCPs)were *** results showed that the average geometric positioning error of UAV hyperspectral images(at 80 m altitude AGL)without geometric correction was as high as 3.4041 m(about 65 pixels).The optimal geometric correction model and parameter combination of the UAV hyperspectral image(at 80 m altitude AGL)used a local triangulation model,adopted a bilinear interpolation resampling method,and selected 12 edgemiddle distributed *** correction accuracy could reach 0.0493 m(less than one pixel).This study provides a reference for the geometric correction of UAV hyperspectral images.

关键词： geometric correction hyperspectral images unmanned aerial vehicle(UAV) ground control point(GCP)

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基于激光雷达的果园沟型测量平台设计与试验

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农机化研究 2024年第3期46卷 62-69,75页

作者：吴岩峰坎杂戚江涛周馨曌李亚萍石河子大学机械电气工程学院新疆石河子832000 农业部西北农业装备重点实验室新疆石河子832000

针对现有检测开沟质量效率低、精度差等问题,设计了一套由激光雷达、编码器、便携式计算机和支架等构成的非接触式果园开沟宽度深度监测平台,基于编码器获取测量平台前行方向位移,并与上位机软件形成整套采集系统,可快速获取果园沟型三... 详细信息

针对现有检测开沟质量效率低、精度差等问题,设计了一套由激光雷达、编码器、便携式计算机和支架等构成的非接触式果园开沟宽度深度监测平台,基于编码器获取测量平台前行方向位移,并与上位机软件形成整套采集系统,可快速获取果园沟型三维坐标。为了降低外部环境对点云数据处理的影响,采用直通滤波进行果园沟型的有效区域选取,借助MatLab获取其三维点云模型,实现对果园开沟沟形的重构与沟深、沟宽数据的监测。通过重构沟型参数与实测参数对比分析可知:两者宽度相关系数为0.83,均方根误差为0.008,相对误差为2.47%;深度相关系数为0.75,均方根误差为0.009,相对误差为2.76%。研究结果表明:重构沟型参数与实际沟型参数吻合度较高,可精确反映原有沟型形貌特征,为智慧农业果园开沟质量智能检测的构建提供了参考。

关键词：果园激光雷达沟型测量三维重建点云

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膜杂捆料多级破碎机设计与试验

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农业工程学报 2024年第2期40卷 187-195页

作者：严义其坎杂王吉亮陈绍杰杨崇科李佳莉张炳成严伟哲冯震李亚萍石河子大学机械电气工程学院石河子832000 新疆农垦科学院机械装备研究所石河子832003 石河子开发区锐益达机械装备有限公司石河子832003 绿洲特色经济作物生产机械化教育部工程研究中心石河子832000

针对棉田机收膜杂捆料中膜-土-秆分布不均、相互裹绕且体积过大,无法直接进行有效破碎的问题,通过分析膜杂捆料的破碎过程,确定了一种先破捆、再破碎的破碎方案,并设计了一种包含均匀喂料装置、直刀破捆装置、Y型甩刀破碎装置的膜杂捆... 详细信息

针对棉田机收膜杂捆料中膜-土-秆分布不均、相互裹绕且体积过大,无法直接进行有效破碎的问题,通过分析膜杂捆料的破碎过程,确定了一种先破捆、再破碎的破碎方案,并设计了一种包含均匀喂料装置、直刀破捆装置、Y型甩刀破碎装置的膜杂捆料多级破碎机。以破碎刀辊转速、喂入速度、定刀数量作为主要影响因素,以残膜破碎合格率作为评价指标,进行三因素三水平试验,确定优化参数指标为试验在破碎刀辊转速1 125 r/min;喂入速度为0.012 m/s;定刀数量1个的因素水平下,此时膜杂捆料破碎合格率达到75.15%,满足后续加工工艺要求。该装置的研究对残膜资源化利用关键技术问题具有重要意义和应用价值。

关键词：农业机械试验残膜资源化利用膜杂捆料破碎机器

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Calibration of the simulation parameters of jujubes in dwarfing and closer cultivation in Xinjiang during harvest period

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International Journal of Agricultural and Biological Engineering 2022年第2期15卷 256-264页

作者： Shiqi Yao Gaokun Shi Baoshuai Wang Huijie Peng Hewei Meng za kan College of Mechanical Electrical Engineering Shihezi UniversityShihezi 832000XinjiangChina Key Laboratory of Northwest Agricultural Equipment Ministry of Agriculture and Rural AffairsShihezi 832000XinjiangChina

order to obtain accurate contact parameters of jujubes in dwarfing and closer cultivation in Xinjiang during the harvest period,based on the Hertz-Mindlin(no-slip)contact model in EDEM,the contact parameters,including the coefficient of restitution,static friction,and rolling friction,between jujube and machine components have been calibrated through physical and simulation *** coefficient of restitution,static friction,and rolling friction between the jujubes and steel(jujube-steel)were calculated as 0.33,0.46,and 0.04,*** coefficient of restitution,static friction,and rolling friction between the jujubes and polyvinyl chloride(PVC)(jujube-PVC)were calculated as 0.39,0.61,and 0.06,*** optimum contact parameters among jujubes(inter-jujubes)were 0.23,0.33,and *** accumulation test was applied for comparing the simulation and testing values of jujube’s repose *** the results,the relative error was 1.27%which means the discrete element model and the contact parameters of jujube can be used for the discrete element simulation *** addition,the results can be adequately used to simulate particle scale mechanics(grain commingling,flow/motion,forces,etc.)of jujube in harvest as well as the design and working mechanism study of post-harvest processing machinery and devices.

关键词： jujube EDEM contact parameter experiment calibration

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Calibration and test of the contact parameters for chopped cotton stems based on discrete element method

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International Journal of Agricultural and Biological Engineering 2022年第5期15卷 1-8,F0003页

作者： Rongqing Liang Xuegeng Chen Bingcheng Zhang Xinzhong Wang za kan Hewei Meng College of Mechanical and Electrical Engineering Shihezi University Shihezi 832000XinjiangChina Engineering Research Center for Production Mechanization of Oasis Special Economic Crop Ministry of EducationShihezi 832000XinjiangChina School of Agriculture Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

In view of the fact that the existing cotton stem simulation models are simplified and have a large discrepancy from the actual appearance and the contact parameters have not been *** this study,the simulation model and numerical simulation were established using the discrete element software *** a second-order response model between contact parameters and repose angle had been *** test result showed that the static friction coefficient,rolling friction coefficient,and coefficient of restitution between cotton stems were crucial factors affecting the repose *** determination coefficient corrected determination coefficient and p-value of the second-order response model were R^(2)=0.959,R^(2)_(adj)=0.921,and p<0.0001 *** error values of the comparison between the simulation test results and the corresponding physical test values were all less than 10%,which showed that the model was reliable and had high interpretation and predictability,this study can provide a certain theoretical basis and data support for the setting of contact parameters in the data simulation of cotton stem harvesting and processing,mechanically-harvested film residue crushing and film stem separation,etc.

关键词： discrete element method cotton stem repose angle contact parameters calibration

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Cotton stalk restitution coefficient determination tests based on the binocular high-speed camera technology

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International Journal of Agricultural and Biological Engineering 2022年第4期15卷 181-189页

作者： Bingcheng Zhang Xuegeng Chen Rongqing Liang Jiali Li Xinzhong Wang Hewei Meng za kan College of Mechanical and Electrical Engineering ShiHezi University Shihezi 832000XinjiangChina School of Agriculture Engineering Jiangsu University Zhenjiang 212013JiangsuChina Engineering Research Center for Production Mechanization of Oasis Special Economic Crop Ministry of EducationShihezi 832000China

The restitution coefficient(RC)of cotton stalks is an important elementary physical parameter that is required to establish the crushing mechanical model and research the film residue separation *** this study,the calculation method of restitution coefficient considering the rotation motion of stalk-shaped agricultural materials was derived based on the principle of kinematics and the energy restitution coefficient method,and a test bench for measuring the RC was designed and *** effects of collision material,moisture content,length,diameter,release height,and collision angle respectively on the RC were investigated by single-factor experiments and orthogonal experiments,and the regression models between influence factors and the RC were *** results showed that Q235 showed the highest value of the RC,and it was followed by cotton stalks and soil lumps,*** RC of cotton stalks decreased with the increase of moisture content and diameter,while it increased at first and then decreased with the increase of *** the release height was less than 500 mm,the RC increased with the increased release *** the collision angle was less than 40°,the RC showed a linear increasing *** significance of the effects of factors on RC decreased with the following sequence:collision angle,length,release height,diameter,and moisture ***,collision angle,and release height were extremely *** contrast test results showed that the values based on Newton’s restitution coefficient method were smaller than that based on the energy restitution coefficient *** verification test showed that the predicted rebound height of cotton stalks calculated based on the energy restitution coefficient method was closer to the actual rebound height,and the relative error was less than 5%.

关键词： high-speed camera technology cotton stalk collision restitution coefficient determination test

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中药材干燥技术与装备研究现状

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农业工程学报 2024年第2期40卷 1-28页

作者：王乐意李长河刘明政李康叶祥瑞王子文范林政王仁坤赵华洋坎杂张国华邬健康青岛理工大学机械与汽车工程学院青岛266520 内蒙古民族大学工学院通辽028042 石河子大学机械电气工程学院石河子832003 山东五康轩现代农林发展有限公司邹城273500

中药材在采收后需经过产地初加工处理,其中干燥是产地初加工的必要环节,并直接影响到中药材的品质。传统的自然干燥方式效率低,且药材干燥品质良莠不齐,严重制约中药产业的发展。因此,加强对中药材干燥技术与装备的研究尤为迫切。基于此... 详细信息

中药材在采收后需经过产地初加工处理,其中干燥是产地初加工的必要环节,并直接影响到中药材的品质。传统的自然干燥方式效率低,且药材干燥品质良莠不齐,严重制约中药产业的发展。因此,加强对中药材干燥技术与装备的研究尤为迫切。基于此,该研究综述了中药材干燥技术与装备的研究现状。首先,总结中药材的干燥脱水过程与理化性质变化规律,分析了药材自身特性与干燥条件对水分脱除速率与干燥品质的影响机制。其次,针对热风、热泵、红外、微波、真空与高压电场干燥技术,以干燥机理为基础,总结各类干燥技术的装备结构与工作原理,分析了干燥装备存在的干燥不均匀、能耗大、效率低等问题并探讨了相应改善方法。同时,研究了各类干燥技术在不同工艺条件下的干燥效果,分析了干燥温度、切片厚度、真空度等工艺参数对干燥效果的影响规律,探讨了预处理、阶段式变温变湿、间歇式干燥等赋能干燥效果的工艺手段,并综合干燥品质、干燥效率与干燥成本,得到了各类干燥技术的优缺点与适用范围。进一步地,分析了微波-真空、微波-热风与远红外-热泵三类联合干燥技术不同组合方式下的干燥机理,阐述了各类联合干燥装备的研发进展,探讨了联合干燥技术相较于单一干燥技术的优势以及装备和工艺存在的不足。最后,从提高中药材品质评价标准、完善干燥相关模型、加强干燥装备研发三方面对研究方向进行了展望,以期为中药材干燥技术研究与装备创新研发提供理论依据与技术支持。

关键词：中药材干燥机理装备效果工艺

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Design and test of a multi-edge toothed cutting device for membraneimpurity mixed material

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International Journal of Agricultural and Biological Engineering 2023年第2期16卷 73-84页

作者： Rongqing Liang Bingcheng Zhang Xuegeng Chen Hewei Meng Xinzhong Wang Congju Shen Yaping Li za kan College of Mechanical and Electrical Engineering ShiHezi UniversityShihezi 832000XinjiangChina School of Agriculture Engineering Jiangsu University Zhenjiang 212013JiangsuChina Engineering Research Center for Production Mechanization of Oasis Special Economic Crop Ministry of EducationShihezi 832000XinjiangChina College of Energy and Machinery Dezhou UniversityDezhou 253023ShandongChina

As the existing residual film crushing device in Xinjiang cannot directly crush membrane-impurity mixed material,by analyzing the compressive and cutting force characteristics of residual film material layer and cotton stalk,the cutting conditions of mixed materials were obtained,and the method of cutting was determined.A multi-edge toothed cutters was created,and a cutting device was *** was preliminarily determined that the number of teeth in the cutters was 8,the clearance between the teeth and between the tooth and fixed blade was 3 mm,the speed of the high-speed cutter was 800 r/min,and the speed difference between the high-and low-speed cutters was-300 r/*** results show that the ratio of residual film to total residual film sampling mass was(2.22±0.30)%,(19.19±2.02)%,(58.94±3.19)% and(20.65±2.05)%,respectively,when the maximum outer profile size in the range of[0,20)mm,[20,100)mm,[100,500)mm and[500,~)*** mass of cotton stalks with lengths of[0,50)mm,[50,100)mm and[100,~)mm accounted for(32.57±1.5)%,(27.77±1.3)%and(39.66±1.75)%,respectively,and the cutting power consumption was(85.41±15.63)*** test results can provide a basis for the subsequent membrane-impurity mixed material cutting technology,as well as some guidance for the separation of it.

关键词： Multi-edge toothed cutter membrane-impurity mixed material cutting device cutting conditions

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Operation power consumption and verification tests of a trenching device for orchards in Xinjiang based on discrete element

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International Journal of Agricultural and Biological Engineering 2021年第1期14卷 133-141页

作者： Chen Ma Jiangtao Qi za kan Shaojie Chen Hewei Meng College of Mechanical and Electrical Engineering Shihezi UniversityShihezi 832000XinjiangChina College of Mechanical and Electronic Engineering Xinjiang Vocational UniversityUrumqi 830013China Key Laboratory of Northwest Agricultural Machinery of the Ministry of Agriculture Shihezi 832000XinjiangChina Ruiyida Machinery Equipment Co. Ltd.Shihezi Development ZoneShihezi 832000XinjiangChina

According to the agronomic requirements of orchard planting pattern and fertilization in Xinjiang,the soil particle models and a soil-trenching device interaction model were established by using discrete element simulation software in order to find out the law of influence of structure parameters and working parameters on the operation power consumption of a segmented cutting trenching device;moreover,its cutting process was simulated according to the response surface test *** to the results of research on the influence of forward speed,cutter disk speed and cutter disk combination on the operation power consumption of the segmented cutting trenching device,the law of their influence on the operation power consumption in descending order is forward speed,cutter disk combination,cutter disk *** to the response surface test result,the following influential factor parameter combination has been obtained:forward speed 815 m/h,cutter disk speed 112 r/min,cutter disk combination A(cut angle 150°,bent angle 60°and working width 133 mm),cutter disk combination B(cut angle 180°,bent angle 90°and working width 166 mm),and trenching operation power consumption-optimization results were verified through field *** to the verification,the results showed a high accuracy of the simulation,with a relative error mean of 3.18%between the theoretical value and the field test *** study can provide a reference for the energy-saving design of orchard trenching devices.

关键词： trenching device discrete element orchard power consumption simulation analysis parameter optimization

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Innovative superheated steam impingement blanching(SSIB)enhances drying rate and quality attributes of line pepper

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Information Processing in Agriculture 2017年第4期4卷 283-290页

作者： Xu-Hai Yang Qian Zhang Jun Wang Li-Zhen Deng za kan College of Mechanical and Electrical Engineering Shihezi UniversityShihezi 832001China College of Engineering China Agricultural UniversityP.O.Box 19417 Qinghua DongluBeijing 100083China

Blanching is an essential step before processing of agricultural products as it can inactivate enzymes that cause undesirable *** current work the effects of superheated steam impingement blanching(SSIB)time and temperature on drying characteristics and red pigments content of line pepper were *** showed that after a 3-min SSIB pretreatment at 110℃ the pepper epidermis covered with wax coat was *** addition,the drying time was extensively decreased and the loss of red pigments of dried products was *** showed that the whole drying process took place in the falling rate period,which indicated that diffusion was the dominant physical mechanism governing moisture movement in the ***,the second Fick’s law of diffusion was used to determine the effective moisture diffusivity(Deff)of line pepper,which increased from 1.193×10^-10 to 3.128×10^-10 m^2/s with increasing of the drying temperature and air *** drying activation energy(Ea)of pretreated samples was 34.31 kJ/mol,which decreased by 3% compared with the non-pretreatment *** findings of this work indicate that SSIB is very promising pretreatment technique as it not only enhances drying process but also improves bioactive substance preservation of red pepper.

关键词： Line pepper High-humidity hot air impingement blanching Air impingement drying Drying characteristics Quality attributes

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