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Influences of moisture content and compressive loading speed on the mechanical properties of maize grain orientations

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International Journal of Agricultural and Biological Engineering 2021年第5期14卷 41-49页

作者： Farman Ali Chandio Yaoming Li Zheng Ma Fiaz Ahmad Tabinda Naz Syed Sher Ali Shaikh Mazhar Hussain Tunio School of Agricultural Engineering Jiangsu UniversityZhenjiang 212000JiangsuChina Faculty of Agricultural Engineering Sindh Agriculture UniversityTandojam 70060SindhPakistan College of Engineering Nanjing Agriculture UniversityNanjing 210044China Department of Agricultural Engineering Bahauddin Zakariya UniversityMultan 60800Pakistan

Determination of the mechanical properties(rupture force,deformation,hardness,and toughness)of maize grain could be a significant concern for designing the harvester,thresher,and handling,processing,and storage ***,the present research was conducted to assess the vertical and lateral rupture force,deformation,hardness,and toughness of maize grain(Beijing Denong,Lianchuang,Suyu 20,Liyu 88 and Suyu 29)influenced by different moisture contents(11.2%,17.5%,and 21.3%)and compressive loading speeds(5,10,15,20,and 25 mm/min,respectively).Besides,the mean length,width,thickness,geometric mean diameter,equivalent diameter,arithmetic diameter,sphericity,grain volume,surface area,and aspect ratio of the selected varieties were *** results showed that the highest length,width,thickness and sphericity,grain volume,surface area,and aspect ratio were obtained at moisture of 21.3%,whereas the lowest was at 11.2%.Moreover,it was observed that as increasing the loading speed from 5 to 25 mm/min,the vertical and lateral rupture forces ***,as increasing moisture contents from 11.2%to 21.3%,the vertical and lateral rupture forces,hardness,and toughness decreased ***,the maximum correlation(R2=0.9957)between rupture force and loading speed was found for Liyu 88 at moisture of 17.5%and minimum correlation(R2=0.7002)was found for Suyu 29 at moisture of 11.2%.Moreover,the highest lateral and vertical rupture force was noticed(p<0.05)at a loading speed of 5 mm/*** on the experimentally obtained results,it was concluded that the properties of maize grain evaluated were relevant to the design of planter,harvesters,thrashers,and processing machine.

关键词： maize grain moisture content compressive loading speeds mechanical properties orientation

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Comparing kernel damage of different threshing components using high-speed cameras

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International Journal of Agricultural and Biological Engineering 2020年第6期13卷 215-219页

作者： Zheng Ma Min Han Yaoming Li Shuncheng Yu Farman Ali Chandio Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationHigh-tech Key Laboratory of Agricultural Equipment and Intelligence of Jiangsu ProvinceSchool of Agricultural Equipment and EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina Sindh Agriculture University Faculty of Agricultural EngineeringTandojamSindhPakistan

Grain damage research has been a focus of many experts in the agriculture machinery industry.A threshing test-bed was developed to investigate the movement and influence of different threshing and separating units on maize *** damage to maize grains was analyzed with a high-speed camera to observe the movement and damage received by the maize *** results showed that the threshing and separating effects of the perforated concave plate were obviously lower than that of the round steel concave plate,the threshing effects of the rigid rasp bar and polyurethane rasp bar were similar,and the damage ratio of the polyurethane rasp bar was relatively *** also indicated that moisture content has a significant effect on the damage ratio and damage type of maize *** different threshing component types used in this study had an obvious effect on the degree of damage to high moisture content maize grains and the damage to high-moisture kernels during threshing could be further *** results can provide a reference for the design of threshing and separating devices in the maize combine harvesting machinery.

关键词： maize grain damage threshing process high-speed camera

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Effects of soil mechanical properties on the height and tractive performance of rubber grouser at different moisture contents

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 31-37页

作者： Sher Ali Shaikh Yaoming Li Zheng Ma Farman Ali Chandio Mazhar Hussain Tunio Fiaz Ahmad Kashif Ali Solangi School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Sindh Agriculture University 70060 Tando JamPakistan Department of Agricultural Engineering Bahauddin Zakariya UniversityMultan 60800Pakistan

Rubber tracked vehicles are commonly used on agricultural machinery that perform agricultural operations such as rice harvesting in soft paddy fields with low bearing *** was carried out to assess the influence of soil moisture content and mechanical properties on the tractive performance of a rubber grouser with three heights(45 mm,55 mm,60 mm).The direct shear test and penetration test were used in this study,which was based on a semi-empirical approach of determining tractive *** shear tests were used to measure soil shear strength parameters such as cohesion,adhesion,internal and exterior friction *** results of the penetration test were used to determine tractive parameters such as soil thrust,running resistance,and traction,for the penetration test,a device was designed and *** experimental results revealed that soil cohesion and adhesion increased linearly with increasing soil moisture content,however adhesion dropped after 30.7%.Similarly,the soil thrust initially increased till 21.5%then ***,running resistance had a decreasing trend over soil moisture content whereas maximum traction achieved for 45 mm grouser height at 21.5%moisture *** was concluded that a rubber grouser with 45 mm height had better traction rather than 55 mm and 60 mm,it can be suitably used for designing a track system for a crawler vehicle(e.g.,harvester)leading to its greater adoption among the farmers.

关键词： soil moisture content traction rubber grouser soil mechanical properties tracked vehicle

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联合收获机清选筛箱轻量化设计与试验

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农业机械学报 2024年第12期55卷 201-211页

作者：马征李毕辉宋志强刘延彬潘宇江苏大学农业工程学院镇江212013 江苏大学现代农业装备与技术教育部重点实验室镇江212013

清选筛箱通过往复运动对脱粒后的混合物进行筛分,是组成联合收获机的核心部件之一。针对谷物联合收获机清选筛箱存在整体质量偏重、强度富余的问题进行轻量化设计。基于清选筛箱动力学分析,分析在工作状态下清选筛箱固有频率和结构强度... 详细信息

清选筛箱通过往复运动对脱粒后的混合物进行筛分,是组成联合收获机的核心部件之一。针对谷物联合收获机清选筛箱存在整体质量偏重、强度富余的问题进行轻量化设计。基于清选筛箱动力学分析,分析在工作状态下清选筛箱固有频率和结构强度,确定了最大等效应力位置及主要应力分布区域。基于等效静态法将动态响应转化为静态响应,以柔顺度最小为优化目标,以结构强度和质量响应约束条件对清选筛箱侧壁进行拓扑优化。采用尼龙作为轻质材料对抖动板结构进行设计,以拓扑优化结果为基础,提取主要结构特征进行模型重构和动力学分析。结果显示,优化后清选筛箱前6阶固有频率变化最大为1.68 Hz,最大等效应力由56.59 MPa下降至52.46 MPa,降幅为7.29%,质量由75 kg降至66.85 kg,降低10.86%。在此基础上,利用优化后的清选筛箱搭建了试验台架,开展实际工况下的应变试验和耐久性试验,试验结果验证了优化后的清选筛箱满足实际工作强度、刚度要求,有效提高了清选筛箱的工作性能。

关键词：清选筛箱动力学分析拓扑优化轻量化设计

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Adaptive backstepping control of tracked robot running trajectory based on real-time slip parameter estimation

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International Journal of Agricultural and Biological Engineering 2020年第4期13卷 178-187页

作者： En Lu Zheng Ma Yaoming Li Lizhang Xu Zhong Tang School of Agricultural Equipment Engineering Jiangsu UniversityZhenjiangJiangsu 212013China World Precise Machinery(China)Co. LtdWorld Industrial ParkPicheng TownDanyangJiangsu 212311China

To ensure the stable driving of tracked robots in a complex farmland environment,an adaptive backstepping control method for tracked robots was proposed based on real-time slip parameter *** to the kinematics analysis method,the kinematic model of the tracked robot was established,and then,its pose error differential equation was further *** this basis,the trajectory tracking controller of the tracked robot was designed based on the backstepping control ***,according to the trajectory tracking error of the tracked robot,the back propagation neural network(BPNN)was used to adaptively adjust the control parameters in the backstepping controller,and the inputs of the BPNN are the trajectory tracking error xe,ye,θ*** that,the soft-switching sliding mode observer(SSMO)was designed to identify the slip parameters during the running of the tracked *** then the parameters were compensated into the adaptive backstepping controller to reduce the trajectory tracking *** simulation results show that the proposed adaptive backstepping control method with SSMO can improve the accuracy of the trajectory tracking control of the tracked ***,the designed SSMO can accurately estimate the slip parameters.

关键词： tracked robot trajectory control adaptive backstepping control neural networks slip parameter sliding mode observer

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BP神经网络预测变振幅防堵筛分性能研究——基于EDEM-RecurDyn仿真

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中国农机化学报 2022年第11期43卷 75-80页

作者：朱永乐马征陈树人 Souleymane Nfamoussa Traore 李耀明姜晟江苏大学现代农业装备与技术教育部重点实验室江苏镇江212013 江苏大学农业工程学院江苏镇江212013

针对物料喂入量变化导致振动筛面堆积堵塞,影响筛分性能的问题。以变振幅筛分机构导向滑槽转角为变量,RecurDyn和EDEM联合仿真水稻籽粒、茎秆非正常喂入(0.5 kg/s)条件下变振幅防堵筛分过程。BP神经网络预测不同滑槽转角下变振幅的筛分... 详细信息

针对物料喂入量变化导致振动筛面堆积堵塞,影响筛分性能的问题。以变振幅筛分机构导向滑槽转角为变量,RecurDyn和EDEM联合仿真水稻籽粒、茎秆非正常喂入(0.5 kg/s)条件下变振幅防堵筛分过程。BP神经网络预测不同滑槽转角下变振幅的筛分效率、含杂率,优化变振幅调节,缓解筛面堆积堵塞,改善筛分性能。结果表明物料非正常喂入(0.5 kg/s)下导向滑槽转角0°~10°时筛分效率在55%~58%内平稳上升,含杂率在0.1%~0.16%内小范围波动变化;滑槽转角15°~40°时筛分效率在58%~75%内线性增大,含杂率在0.11%~0.19%内波动上升;滑槽转角40°~45°时筛分效率骤然线性下降至65.8%,含杂率陡然升高至0.37%。BP神经网络预测滑槽转角在37°时变振幅筛分效率最高、含杂率较低,变振幅防堵筛分性能更好,此时筛分效率和含杂率为74.30%、0.20%。BP神经网络预测模型R^(2)为0.999,预测误差集中在-0.00041,预测曲线均高度拟合。验证了BP神经网络预测模型的可靠性和精确度。这为未来变振幅防堵筛分的智能化调控提供了依据。

关键词：变振幅 EDEM-RecurDyn BP神经网络筛分效率含杂率

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