三种湿地植物在高负荷养猪废水脱氮过程中的根际效应
作者：
夏梦华;刘铭羽;叶磊;李希;李裕元;...
期刊：
农业环境科学学报 ,2024年43(04):896-905 ISSN：1672-2043
作者机构：
中国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,长沙 410125;中国科学院大学,北京 100049;湖南农业大学工学院,长沙 410128;[吴金水; 李希; 夏梦华; 李裕元; 刘铭羽] 中国科学院亚热带农业生态研究所;[叶磊] 湖南农业大学
关键词：
养猪废水;人工湿地;氮;根系分泌物;根际微生物
摘要：
为了探究不同湿地植物在处理高负荷养猪废水时的根际效应，本研究通过野外小区控制试验，以3种常见的挺水植物美人蕉（Canna indica）、梭鱼草（Pontederia cordata）、黄菖蒲（Iris pseudacorus）为研究对象构建表流人工湿地，研究人工湿地植物根系分泌物与根际氮循环微生物之间的关系。结果显示，梭鱼草对养猪废水的处理效果最好，氨氮、硝氮和总氮的去除率分别为78.3%、93.4%和81.2%。与试验前相比，梭鱼草和黄菖蒲根系可溶性有机碳（DOC）分泌速率在试验后分别增加了44.9%和13.5%；根系总有机酸（TOA）分泌速率分别增加了125.1%和147.5%。在处理养猪废水后，3种植物根际硝化过程氨氧化细菌（AOB）占主导地位，AOB-amoA基因丰度在黄菖蒲根际土中最高，为2.6×10~8 copies·g-1；反硝化过程nirK基因占主导地位，nirK基因丰度在梭鱼草根际土中最高，为4.3×10~8 copies·g-1。同时，3种植物根际均存在较明显的厌氧氨氧化过程，hzsB基因丰度在梭鱼草根际土中最高，为2.6×10~7 copies·g-1。研究表明，根系分泌DOC和TOA可促进根际氮循环微生物的生长繁殖，进而提高人工湿地系统的脱氮能力。3种植物中梭鱼草生物量较大，根系分泌能力较强，在养猪废水的生态修复方面具有更高的应用潜力。
语种：
中文
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Design and test of a throwing roller type lily bulb harvester [抛送辊式百合收获机的设计与试验]
作者：
代振维;吴明亮;方志超;曲永波;柳亚峰
期刊：
农业工程学报 ,2023年39(12):20-29 ISSN：1002-6819
通讯作者：
Wu, Mingliang(mlwu@hunau.edu.cn)
作者机构：
[代振维; 吴明亮; 方志超; 曲永波; 柳亚峰] College of Engineering, Hunan Agriculture University, Changsha;410128, China;Hunan Provincial Engineering Technology Research Center for Modern Agricultural Equipment, Changsha;Hunan Mechanical & Electrical Polytechnic, Changsha;410151, China
关键词：
农业机械;设计;试验;抛送辊;百合;收获机;果土分离机构
摘要：
为了解决黏重土壤条件下百合收获时果土分离效果差、埋果率高、破碎率高的问题,设计了一种适合黏重土壤条件下作业的抛送辊式百合收获机。结合百合生长状况以及种植农艺要求,对果土混合物在振动输送装置、抛送辊组上的运动过程及分离作业...展开更多 为了解决黏重土壤条件下百合收获时果土分离效果差、埋果率高、破碎率高的问题,设计了一种适合黏重土壤条件下作业的抛送辊式百合收获机。结合百合生长状况以及种植农艺要求,对果土混合物在振动输送装置、抛送辊组上的运动过程及分离作业机理进行分析,构建了黏重土块在抛送辊上抛掷碎土、碰撞碎土的动力学模型,通过分析得到了振动输送装置结构及最大摆动角度、抛送辊组级数、抛送辊轮齿数、抛送辊轮直径及轮廓尺寸等参数。根据设计结果搭建了样机并进行了作业参数的多因素试验,以果土分离机构前进速度、抛送辊转速、挖掘深度为试验因素,百合埋果率、破碎率为试验指标,运用Box-Benhnken试验方法,建立因素与试验指标的回归方程,并得到因素对百合收获指标的影响规律。当试验取最优参数组合为果土分离机构前进速度为0.6 m/s,抛送辊转速为90 r/min、挖掘深度为170 mm时,百合埋果率、百合破碎率的田间试验值分别为6.3%和7.1%。机具各项性能符合设计要求,该研究成果可为百合机械化收获技术及装备研究提供参考。收起
语种：
中文
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Deep residual convolutional neural network based on hybrid attention mechanism for ecological monitoring of marine fishery
作者：
Liu, Jiangxun;Zhang, Lei;Li, Yanfei;Liu, Hui
期刊：
Ecological Informatics ,2023年77:102204 ISSN：1574-9541
通讯作者：
Liu, H
作者机构：
[Liu, Hui; Liu, Jiangxun; Zhang, Lei] Cent South Univ, Inst Artificial Intelligence & Robot IAIR, Sch Traff & Transportat Engn, Key Lab Traff Safety Track,Minist Educ, Changsha 410075, Hunan, Peoples R China.;[Li, Yanfei] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Liu, H ] C;Cent South Univ, Inst Artificial Intelligence & Robot IAIR, Sch Traff & Transportat Engn, Key Lab Traff Safety Track,Minist Educ, Changsha 410075, Hunan, Peoples R China.
关键词：
Attention mechanism;Convolutional neural network;Marine fishery;Residual module;Target detection
摘要：
Understanding the ecological environment, population abundance, and growth status of marine organisms in the marine fishery is important to promote its sustainability. However, existing manual detection methods can cause some damage to marine ecology and are difficult to meet the demand for fast and accurate detection. In addition, light, shadows, and disturbances in the marine ecosystem can affect the effectiveness of intelligent detection methods. To address these problems, a deep residual convolutional neural network (DRCNN) based on hybrid attention mechanism (HAM) is proposed to detect marine organisms. The hybrid attention mechanism obtains key information from both channel and space dimensions of the input image. And the residual module is added to the deep convolutional neural network to iteratively extract image features while avoiding error accumulation. It is demonstrated experimentally that the HAM-DRCNN model achieves 93.17% image localization accuracy with a processing speed of 20.95 frames/s. Compared with the YOLOv5 and Faster R-CNN, the mean average precision of species classification is 91.36%, which is an improvement of 0.93% and 9.39%, respectively. In addition, excellent results are achieved on two other benchmark datasets. The method can accurately locate and complete the classification of marine organisms in underwater images and has practical application value.
语种：
英文
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The design and test of circular-cutting and middle-placing windrower for oilseed rape
作者：
Luo, Haifeng;Xiao, Xiao;Zhang, Beibei;Li, Xu;Wu, Mingliang;...
期刊：
International Journal of Vehicle Design ,2022年89(1-2):1-23 ISSN：0143-3369
作者机构：
[Li, Xu; Xiao, Xiao; Zhang, Beibei; Xie, Wei; Luo, Haifeng; Wu, Mingliang] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.;[Li, Xu; Xie, Wei; Luo, Haifeng; Wu, Mingliang] Hunan Prov Engn Technol Res Ctr Modern Agr Equipme, Changsha 410128, Peoples R China.;[Li, Xu; Luo, Haifeng; Wu, Mingliang] Collaborat Innovat Ctr Grain & Oil Crops South Chi, Changsha 410128, Peoples R China.
关键词：
Oilseeds;Circular cutting;Cut;Design and tests;Intelligent synchronoi control;Oil seed rape;Simulated analysis;Symmetrical hugging;Synchronous control;Windrow;Windrowers;Electric drives
摘要：
An electric-drive circular-cutting and middle-placing windrower for oilseed rape is designed. Circular cutter adopts the cutting method that a chain-driven movable blade is combined with upper and lower double fixed blades, and designs a double-support circular cutter as well. Moreover, the symmetrical hugging and middle-placing reeling device is designed through artificial reeling operation. The simulated and kinematic analysis of the reeling device is done as well. The simulated analysis results show that the reeling track meets the operation requirement and the reeling devices have a good effect on the rape plants. The intelligent synchronous reeling control is designed on the reeling device drive. The field test of the prototype showed that the placing angle of the windrower was 11.48°, and the angle difference was 6.64°.This research provides theoretical and technical references for the design of the circular-cutting and middle-placing windrower for oilseed rape. Copyright © 2022 Inderscience Enterprises Ltd.
语种：
英文
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振动和拨辊推送式藠头收获机研制
作者：
曲永波;方志超;柳亚峰;代振维;吴明亮
期刊：
农业工程学报 ,2022年38(19):51-59 ISSN：1002-6819
通讯作者：
Fang, Zhichao(fangzhichao@hunau.edu.cn)
作者机构：
[曲永波; 方志超; 柳亚峰; 代振维; 吴明亮] College of Engineering, Hunan Agriculture University, Changsha;410128, China;Hunan Key Laboratory of Interlligent Agricultural Machinery and Equipment, Changsha;Hunan Mechanical & Electrical Polytechnic, Changsha;410151, China
关键词：
农业机械;收获机;振动;多级分离;丘陵山区;藠头
摘要：
针对现有根茎类作物收获机用于藠头收获时存在的果土分离不彻底、埋果率高、地形适应性差等问题,该研究研制了基于"杆筛式振动碎土+拨辊推送式多级分离"技术的自走式藠头收获机。对挖掘和果土分离过程中的物料状态和作业机理进行了分析,建立模型计算得到了挖掘装置的位置和深度、杆筛式振动装置的振幅和曲柄转速、拨辊的尺寸和位置等关键参数,基于可调式挖掘装置、杆筛式振动装置、拨辊推送式多级分离装置组成加工了藠头收获机样机。针对研究内容设计了田间挖掘试验和整机性能试验,对以上装置及整机的作业性能进行验证。田间试验表明:该机实际挖掘深度稳定,漏挖率、埋果率、总伤果率分别为0.31%、3.20%、5.87%,有效收获率为93.23%。整机结构及布局合理,性能稳定,能够满足当前丘陵山区条件下藠头机械化收获的需求。
语种：
中文
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《房屋建筑学》之设计基本原理的教学方法思考
作者：
刘巧玲;刘保华
期刊：
砖瓦 ,2021年(10):196-197 ISSN：1001-6945
作者机构：
[刘巧玲] 湖南农业大学东方科技学院;[刘保华] 湖南农业大学工学院
关键词：
建筑体型设计;几何体型;体型系数;体型组合
摘要：
阐述了《房屋建筑学》设计基本原理教学的改进方法,从土木工程专业学生的实际学情出发,以"建筑体型设计"为例提出教学新思路,并获得了学生的肯定及良好的教学效果。
语种：
中文
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Design and Experiment on Shoveling Device of Pig Manure Organic Fertilizer by Hermetia illucen Transforming Based on Bucket-wheel Mechanism [斗式黑水虻处理猪粪有机肥取料机设计与试验]
作者：
彭才望;贺喜;孙松林;宋世圣;向阳;...
期刊：
农业机械学报 ,2021年52(2):145-156 ISSN：1000-1298
作者机构：
[彭才望; 孙松林; 宋世圣; 向阳] College of Engineering, Hunan Agricultural University, Changsha, 410128, China;[贺喜] College of Animal Science and Technology, Hunan Agricultural University, Changsha, 410128, China;[许道军] School of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
关键词：
猪粪;黑水虻;有机肥;斗式取料机;离散元
摘要：
针对黑水虻处理的猪粪有机肥在取料输送过程中劳动强度大、作业效率低的问题,根据黑水虻养殖工艺流程与有机肥物理特性,设计了一种斗式取料机.采用离散元软件构建了有机肥-斗轮机械部件耦合仿真模型,运用单因素试验方法获得了斗轮进给速度、料斗转速、料斗数量对单斗平均取料量、变异系数的影响规律,并确定了各因素取值范围.在单因素试验基础上,运用Box-Behnken中心组合试验方法,以斗轮进给速度、料斗转速、料斗数量为试验因素,进行了三因素三水平二次回归正交试验.建立了响应面数学模型,分析了各因素对作业效果的影响,同时对影响因素进行了综合优化.结果 表明:对单斗平均取料量与变异系数影响显著顺序由大到小均为料斗转速、料斗数量、斗轮进给速度;最优工作参数组合为斗轮进给速度65 mm/s、料斗转速8.25 r/min、料斗数量3个,在最优工作参数组合下,单斗平均取料量、变异系数的理论优化值与试验值分别为4.008、4.236 kg和3.19％、3.37％,二者相对误差为5.38％、5.34％,仿真试验和台架试验结果吻合度较好.
语种：
中文
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Optimal design and experiment of multi-row rolling-style planting-hole punch for rapeseed plant seedlings
作者：
Wei Xiang;Mingliang Wu;Jiangnan Lyu;Lan Ma;Jiajie Liu;...
期刊：
International Journal of Industrial and Systems Engineering ,2021年38(2):143-166 ISSN：1748-5037
作者机构：
[Wu M.] College of Engineering, Hunan Agricultural University, Changsha, 410128, China;[Lyu J.; Ma L.; Liu J.; Zhou W.] Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, China;[Xiang W.] College of Engineering, Hunan Agricultural University, Changsha, 410128, China<&wdkj&>Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, China
关键词：
Agricultural machinery;Agricultural robots;Computer aided design;MATLAB;Numerical methods;Optimal systems;Systems engineering;Effective depth;Forming machine;Forming mechanism;High-efficiency;Numerical simulation method;Optimisation designs;Structural parameter;Technical support;Seed
摘要：
In order to realise high-efficiency hole-forming and pursue optimal forming hole parameters which satisfied agricultural requirements for awl-shaped punch transplanter, a optimally designed indigenously-developed pure rolling planting hole-forming machine’s hole forming mechanism parts is proposed. The CAD software graphing method was used to study the effect of forming planting hole by structural parameters, with the numerical simulation method by MATLAB 7.0 software and CATIA software were used to verify the rationality of the hole-forming key parameters optimisation design. Subsequently, prototype trial-production was carried out, followed by field testing. The results showed that forming planting hole opening lengthwise shrank from originally 88.8 mm to 72.6 mm, lateral width was 41.2 mm, the effective depth reduced from 58.9 mm to 48.5 mm, qualified radio of forming planting hole reached to 95.1%, which 1.93% higher than the original prototype, which was significant for the provision of technical support for the design of new transplanter. Copyright © 2021 Inderscience Enterprises Ltd.
语种：
英文
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黑水虻虫沙并排式双叶轮集料装置设计与试验
作者：
彭才望;周婷;宋世圣;孙松林;向阳;...
期刊：
农业机械学报 ,2021年52(12):142-152 ISSN：1000-1298
作者机构：
[彭才望; 周婷; 宋世圣; 孙松林; 向阳] College of Engineering, Hunan Agricultural University, Changsha, 410128, China;[许道军] College of Veterinary Medicine, Hunan Agricultural University, Changsha, 410128, China
关键词：
黑水虻虫沙;集料装置;并排式;叶轮
摘要：
针对黑水虻虫沙收集过程劳动强度大、作业效率低等问题,设计了一种并排式黑水虻虫沙双叶轮集料装置。首先,依据黑水虻幼虫生物转化畜禽粪便工艺特点,确定并排式双叶轮的外形尺寸;通过对并排式双叶轮工作机理和动力学分析,确定弧形叶轮片曲线与数量,并获得叶轮集料运动轨迹和方程;在此基础上,确定了影响其集料性能的主要因素,选取前进速度、叶轮倾角、叶轮转速为试验因素,以集料效率和集料均匀度变异系数为响应值分别进行单因素及三因素三水平二次回归正交试验。建立了响应面数学模型,分析各因素对集料性能的影响,利用Design-Expert软件对影响因素进行综合优化。试验结果表明,各因素对集料效率的影响由大到小顺序为:叶轮倾角、前进速度、叶轮转速;对集料均匀度变异系数的影响由大到小顺序为:叶轮转速、前进速度、叶轮倾角。对优化结果进行试验验证得最优参数组合为:前进速度0.06 m/s、叶轮倾角18°、叶轮转速16 r/min,此时集料效率为4.67 kg/s,集料均匀度变异系数为2.81%,评价指标的试验值与模型优化值的相对误差为3.78%与6.84%,满足黑水虻虫沙集料输送要求。
语种：
中文
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Calibration Transfer for Near-Infrared (NIR) Spectroscopy Based on Neighborhood Preserving Embedding
作者：
Chen, Lijuan;Liu, Dawei;Zhou, Jiheng* ;Bin, Jun* ;Li, Zhen
期刊：
Analytical Letters ,2021年54(6):947-965 ISSN：0003-2719
通讯作者：
Zhou, Jiheng;Bin, Jun
作者机构：
[Zhou, Jiheng; Chen, Lijuan] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Peoples R China.;[Liu, Dawei] Hunan Agr Univ, Coll Engn, Changsha, Peoples R China.;[Bin, Jun] Guizhou Univ, Coll Tobacco Sci, Guiyang 550025, Peoples R China.;[Li, Zhen] Guizhou Tobacco Co, Qianxinan Branch, Xingyi, Peoples R China.
通讯机构：
[Zhou, Jiheng] H;[Bin, Jun] G;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Peoples R China.;Guizhou Univ, Coll Tobacco Sci, Guiyang 550025, Peoples R China.
关键词：
Calibration transfer;dimensionality reduction;near-infrared spectroscopy (NIR);neighborhood preserving embedding (NPE)
摘要：
Calibration transfer is a subtle issue in the practical application of near-infrared (NIR) spectroscopy technique. In this paper, a novel method to calibration transfer based on neighborhood preserving embedding (CTNPE) for correcting spectral differences was proposed. As a manifold learning method, neighborhood preserving embedding (NPE) can not only capture the nonlinear manifold structure, but also retain the linearity and show good generalization ability. Since this approach can reveal low dimensional manifold structure in high dimensional spectroscopic data, it is beneficial to construct the transform relationship between source and target spectra. The performance of CTNPE was assessed and compared to that of piecewise direct standardization (PDS) and other four dimensionality reduction-based methods, including transfer based on target factor analysis (TTFA), spectral space transformation (SST), calibration transfer based on canonical correlation analysis (CTCCA) and based on independent component analysis (CTICA), in two real cases. The results indicated that CTNPE was able to successfully transfer spectra between instruments and samples in different physical states. Furthermore, CTNPE provided lower prediction errors than PDS, TTFA, CTCCA, SST, CTICA and direct prediction without a transfer function. Therefore, the comprehensive investigation carried out in the presented work demonstrates that CTNPE is a promising calibration transfer method for NIR, especially for correcting the variations for samples in different physical states.
语种：
英文
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Effects of low molecular weight organic acids on adsorption of quinclorac by sepiolite
作者：
Yang, Lihua;Deng, Yaocheng;Gong, Daoxin* ;Luo, Haifeng* ;Zhou, Xuguo;...
期刊：
Environmental Science and Pollution Research ,2021年28(8):9582-9597 ISSN：0944-1344
通讯作者：
Gong, Daoxin;Luo, Haifeng
作者机构：
[Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Jiang, Fangzhou] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Luo, Haifeng] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.;[Zhou, Xuguo] Univ Kentucky, Dept Entomol, Lexington, KY 40546 USA.
通讯机构：
[Gong, Daoxin; Luo, Haifeng] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.
关键词：
Low molecular weight organic acids;Quinclorac;Sepiolite;Adsorption;Mechanism
摘要：
The effects of low molecular weight organic acids (LMWOAs) on the adsorption of quinclorac by sepiolite were investigated using laboratory batch technique. Experiments were conducted with two natural sepiolite samples with different crystal structures and chemical compositions and high-purity sepiolite. The LMWOAs used were acetic, oxalic, and citric acid. And the adsorption mechanism was characterized using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Our analysis revealed that adsorption of quinclorac on α-sepiolite and β-sepiolite was inhibited in the presence of 4 mmol L−1 LMWOAs, whereas LMWOAs stimulated the adsorption of quinclorac in the high-purity sepiolite. Inhibition or stimulation varied across the different types of organic acids. The adsorption isotherms in the presence of 4 mmol L−1 LMWOAs were better explained by Freundlich and linear model. The effect of organic acid concentrations (0–32 mmol L−1) on the adsorption of quinclorac by the three sepiolite samples varies greatly depending on the type of organic acid and the property of sepiolite. FTIR, XRD, and XPS analyses showed that LMWOAs bound strongly to the Si–O bond structure, and Si–O-quinclorac-acetic acid (oxalic acid or citric acid) was formed on the surface of β-sepiolite. The adsorption of quinclorac by β-sepiolite was via hydrogen bond, complexation reactions, and charge transfer in the presence of LMWOAs. These results indicate that LMWOAs affect quinclorac adsorption through various interactions involving competition, electrostatic attraction, bridging action, and hydrogen bonding. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
语种：
英文
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钵苗移栽机取苗装置研究现状及展望
作者：
冯世杰;吴明亮;颜波;全伟
期刊：
农机化研究 ,2020年42(12):1-9 ISSN：1003-188X
作者机构：
湖南农业大学 工学院, 长沙 410128;信阳农林学院 园艺学院, 河南 信阳 464000;湖南省现代农业装备工程技术研究中心, 长沙 410128;[吴明亮; 全伟; 颜波; 冯世杰] 湖南农业大学
关键词：
钵苗;移栽机;取苗装置
摘要：
钵苗自动化移栽是提高作物单产、保障我国粮食供给安全的重要手段。为此,对国内外钵苗移栽机取苗装置的研究现状进行了阐述,按照取苗方式的不同将取苗装置分为气力辅助式、顶出式、夹取式、组合式和带式5类,指出了现有取苗装置存在的问题,提出了相应的建议,并对钵苗自动移栽机取苗装置的发展趋势进行了探讨。
语种：
中文
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匀速移动汽车荷载在曲形路面行驶的动力响应分析
作者：
杨敬林;万琳辉;方亮
期刊：
安徽建筑 ,2020年24(05):383-384,392 ISSN：1007-7359
作者机构：
湖南农业大学工学院,湖南长沙,410128;[方亮; 万琳辉; 杨敬林] 湖南农业大学
会议名称：
第23届华东6省1市土木建筑工程建造技术交流会
会议时间：
201709
会议地点：
安徽池州
会议论文集名称：
第23届华东6省1市土木建筑工程建造技术交流会论文集
关键词：
汽车荷载;曲形路面;动力响应;动挠度;自由振动
摘要：
文章模拟移动汽车荷载在不平整路面行驶,路面形状假设为一曲形路面,将移动汽车简化为质量弹簧系统,研究汽车行驶通过该曲形道路,探讨路面与车辆的的振动问题,由振动基本理论求解振动微分方程,得出曲形路面在移动汽车通过路面时动力挠度的解析解,得出曲形路面在不同移动汽车行驶速度时的动挠度变化曲线,探讨了动挠度随曲形路面长度的变化,此外也研究了在移动汽车荷载通过曲形路面后该道路路面的自由振动规律.最后通过实例数值计算,得出曲形路面在移动汽车荷载不同行驶速度时的动力挠度曲线,也探讨了在三种汽车行驶速度工况下动挠度随曲形路面长度的变化,为道路设计与汽车在不平整路面行驶时的影响提供一些参考依据.
语种：
中文
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植保机在线混药系统的设计及混药性能试验
作者：
汪福杰;蒋蘋;石毅新;胡文武;罗亚辉;...
期刊：
湖南农业大学学报(自然科学版) ,2020年46(2):236-242 ISSN：1007-1032
作者机构：
湖南农业大学工学院,湖南长沙 410128;[周书娴; 罗亚辉; 胡文武; 蒋蘋; 汪福杰; 石毅新] 湖南农业大学
关键词：
植保机;在线混药系统;混合器;数值模拟;分光光度法;变异系数
摘要：
为提高植保机喷雾作业中的农药利用率,设计了一种在线混药系统。混药系统主要包括取水单元、取药单元、混合器和控制单元。系统工作时,控制单元控制取水单元和取药单元抽取水溶液和农药,注入混合器混合,混合液经隔膜泵加压后经过喷头喷施。基于计算流体力学理论,建立内置7块扰流板且注药口和注水口沿边壁垂直分布并正对第1块扰流板的圆柱形静态混合器模型,运用Fluent软件对模型进行数值分析,结果常压(0.1 MPa)时,混合器出口处药水混合均匀性变异系数为2.2%,药水混合效果最佳,但注药口有药剂回流现象,故提出药剂加压的模拟方案。药剂加压1 MPa时,注药口无药剂回流现象,药水混合均匀性变异系数为2.0%,药水混合效果优于常压。用胭脂红溶液替代农药进行试验,加压状态下,混药系统喷头处混药稳定性最大相对误差为4.301%,药水混合变异系数最大,为3.989%,混药性能优于常压,与仿真结果基本吻合;对在线混药系统进行隔膜泵变工况试验,结果水流量在35~140 L/min时,药水配比为(1∶300)~(1∶3 000)时,在线混药系统混合均匀性系数最大,为4.670%。
语种：
中文
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Design and experimental study on automatic levelling system of high ground gap plant protection system chassis
作者：
Shi, Yixin;Shu, Xin;Jiang, Ping;Hu, Wenwu;Lin, Wei;...
期刊：
International Journal of Applied Systemic Studies ,2020年9(1):11-25 ISSN：1751-0589
通讯作者：
Jiang, Ping(pingjiangk@aliyun.com)
作者机构：
[Shi, Yixin; Shu, Xin; Jiang, Ping; Hu, Wenwu; Lin, Wei; Dong, Chengquan] College of Engineering, Hunan Agricultural University, Changsha;410128, China;[Shi, Yixin; Shu, Xin; Jiang, Ping; Hu, Wenwu; Lin, Wei; Dong, Chengquan] 410128, China
通讯机构：
[Jiang, P.] C;College of Engineering, China
关键词：
plant protection machine;fuzzy control;control system;automatic levelling;levelling strategy.
摘要：
In order to realise ground clearance and levelling control of plant protection machine in high ground clearance. In this paper, a chassis automatic levelling control system is designed. Position error control method and angle error control method are used to control the chassis automatic levelling control system, which is divided into ground clearance height adjustment and chassis levelling control strategy, respectively. The system is controlled by combining fuzzy control algorithm and preset point levelling method. The experiment was carried out on the chassis of our self-developed multi-functional plant protection machine with high ground clearance. The results show that the automatic levelling system can complete the chassis levelling well. Its average horizontal error is < 0.20°, root mean square error < 0.25°, maximum error is 1.13°, average levelling time < 26 s, and levelling precision < 0.2°. The system can meet the operation requirements of plant protection machine.
语种：
英文
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PERFORMANCE ASSESSMENT OF A SELF-PROPELLED PADDY GRAIN THRESHER UNDER DIFFERENT THRESHING FUNCTIONAL PARAMETERS
作者：
Looh, G. A.;Xie, F.* ;Mangeh, F. C., III;Wang, X.
期刊：
APPLIED ENGINEERING IN AGRICULTURE ,2020年36(2):141-149 ISSN：0883-8542
通讯作者：
Xie, F.
作者机构：
[Looh, G. A.; Mangeh, F. C., III; Wang, X.] Hunan Agr Univ, Dept Agr Mechanizat Engn, Coll Engn, Changsha, Peoples R China.;[Xie, F.] Hunan Agr Univ, Coll Engn, Changsh, Peoples R China.;[Xie, F.] Ctr Southern Chinese Grain & Oilseed, Hunan Prov Key Lab Intelligent Agicultural Equipm, Changsha, Hunan, Peoples R China.;[Xie, F.] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.
通讯机构：
[Xie, F.] H;Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.
关键词：
Assessment;Axial threshing unit;Concave clearance;Cylinder speed;Feed rate;Functional parameters;Threshing percentage
摘要：
This research was conducted to assess the performance of a self-propelled mini combine harvester, model number 4LZ-0.8 under different threshing functional parameters such as cylinder speed, concave clearance, and feed rate. An indoor experiment was conducted using the mini combine with an axial flow threshing cylinder and tangential feeding of material. These functional parameters were set at 5 levels each. The responses were obtained in terms of threshing percentage, percentage of unthreshed grains and percentage of broken grains. Response values were analyzed using the response surface tool (rstool) in MATLAB. Analysis of variance was done to determine the significant effects of the factor variations on the response values. MATLAB was used to present response surface graphs that were used to describe the variations of the responses as the factors changed from one level to the other. Results showed that with an increase in cylinder speed from 697 to 1202 rpm, the percentage of broken grains increased significantly from 0.0384% to 3.4052%, respectively. At cylinder speeds of 697 and 1202 rpm, the percentage of unthreshed grains increased from 0.1515% to 0.2162%, respectively. Furthermore, an increase in feed rate decreased the threshing percentage. The highest threshing percentage was obtained at an average concave clearance of 27 mm. Furthermore, it was realized that increasing the concave clearance from 18 to 35 mm, equally increased the percentage of unthreshed grains from 0.1478% to 0.3177%. The percentage of grain damage decreased from 3.2758% to 0.0268% with an increase in concave clearance from 18 to 35 mm, respectively. From the results obtained, it was tested and suggested that operating the threshing cylinder at a cylinder speed of 1100 rpm, concave clearance of 27 mm and feed rate of 0.9 kg s-1 offered the best machine performance. At these suggested values of the operating parameters, the threshing percentage was 99.9801%, the percentage of broken grains was 0.0134%, and the percentage of unthreshed grains was 0.0199%. Copyright © 2020 American Society of Agricultural and Biological Engineers
语种：
英文
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水稻秸秆压块成型工艺参数试验优化
作者：
张贝贝;易鹏;罗海峰;吴明亮;谢伟;...
期刊：
中国农机化学报 ,2020年41(6):120-125,136 ISSN：2095-5553
作者机构：
湖南农业大学工学院,长沙市,410128;南方粮油作物协同创新中心,长沙市,410128;湖南省现代农业装备工程技术研究中心,长沙市,410128;[吴明亮; 陈文凯; 谢伟; 易鹏; 张贝贝; 罗海峰] 湖南农业大学
关键词：
水稻秸秆;压块;工艺参数;正交试验
摘要：
田间移除秸秆可以减轻水稻重金属超标的问题,水稻秸秆压块成型可以为田间快速移除秸秆提供有利条件,因此对水稻秸秆快速压块成型设备关键部件和液压系统进行设计选型。选取压块成型过程中素秸秆长度、含水率、批次装填量等主要影响因素,以压缩块成型效果和密度为指标进行单因素试验,并在该基础上选取合适的作业范围进行多因素试验,极差分析和方差分析得到最优组合为稻秸秆含水率25%、切碎长度25 mm、批次装填量30 kg,对应稻秸秆压块成型密度为0.77 g/cm~3,压块成型效果最佳。
语种：
中文
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基于EDEM的植苗沟槽成形分析与试验研究
作者：
肖仕雄;肖名涛;孙松林;陈斌
期刊：
农机化研究 ,2020年42(11):145-149+161 ISSN：1003-188X
作者机构：
湖南农业大学 工学院, 长沙 410128;[孙松林; 陈斌; 肖名涛; 肖仕雄] 湖南农业大学
关键词：
移栽;油菜;沟槽;成形;回土率
摘要：
针对在南方稻油轮作的种植方式中,油菜移栽密度高及现阶段机具作业效率低等问题,提出了一种厢面开植苗沟槽的移栽方法。为了验证植苗沟槽的成形机理,采用了EDEM软件分析了植苗沟槽的成形过程,建立了土壤含水率在30%与12%时的EDEM土壤模型。通过仿真试验分析了土壤在2、4、6、8cm处的回土特性,得出了土壤之间的粘性力与回土率相关性。试验结果与仿真结果十分接近,证明了模型的可靠性。
语种：
中文
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离地高度可调的减振式履带驱动机构设计
作者：
陈斌;张致远;肖名涛;孙松林
期刊：
农业装备与车辆工程 ,2020年58(3):32-34 ISSN：1673-3142
作者机构：
410000 湖南省长沙市 湖南农业大学工学院;[孙松林; 陈斌; 肖名涛; 张致远] 湖南农业大学
关键词：
履带底盘;驱动机构;离地高度;减振
摘要：
履带式农田作业车由于其优异的通过性与稳定的行驶性能,被广泛使用于南方丘陵地区。针对传统履带底盘采用刚性悬架,无法调节离地高度,行驶时乘坐舒适性较差的问题,设计了一种离地高度可调的减振式履带驱动机构。该机构采用分离式设计,将整个驱动机构分为上层承载架与下层行驶架,通过在上、下层之间设置液压缸与弹性元件,达到在一定区间内调节车辆离地高度与减少车身振动的目的。通过对关键部件进行重点设计,并对其工作过程进行简要分析,该机构在理论上能达到设计要求。
语种：
中文
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农业机器人技术发展综述
作者：
肖旭;李明;谢景鑫;黄金其;张良;...
期刊：
湖南农业科学 ,2020年(11):113-118 ISSN：1006-060X
作者机构：
湖南农业大学工学院,湖南 长沙 410128;湖南省农业装备研究所, 湖南 长沙 410125;[张良; 黄金其; 肖旭; 李明; 谢景鑫; 张洪铎] 湖南农业大学
关键词：
农业机器人;分类;设施农业机器人;大田生产机器人;综述
摘要：
农业机器人技术近年来得到了广泛的研究,根据农业机器人的功能和用途可以将农业机器人分为设施农业机器人、大田生产机器人和畜牧类养殖机器人.介绍了农业机器人的特点及分类,综述了设施农业机器人、大田生产机器人在农业领域的应用现状,总结了目前农业机器人技术发展面临的主要问题,并预测了农业机器人未来的主要发展方向,以期为农业机器人技术的进一步发展提供参考.
语种：
中文
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