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Design and experiment of the components for soil flow direction control of hilling machine based on EDEM

International Journal of Agricultural and Biological Engineering 2022年第3期15卷 122-131页

作者： Zhenwei Tong lianhao li Xiuli Zhang Yong Chen Xiaochan liu Peilin Zhou Yueqing Xia College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China

Cultivation and hilling are important steps in crop field management and provide an important guarantee of crop quality and quantity.With the aim of addressing how the soil flow direction of a traditional cultivation and hilling machine is difficult to control,and because it is difficult to achieve high ridge soil cultivation,among other issues,the components of the soil flow direction control of a hilling machine was designed.The components of the soil flow direction control consisted of a soil-feeding plough device,spiral knives and guide cover devices,etc.The design and analysis of the guiding parts for the two tools of the soil-feeding plough device and the spiral knife were performed to obtain an appropriate guide wall and helix angle.The guiding principle in the flow direction control components was analyzed.The design of the guide wall adopts the torsional columnar plough surface,and the elementary line angle changes from stable to increasing.The analysis of spiral milling showed that when the spiral angle is large,the milling effect is better.According to the discrete element method,the working part of the machine-soil interaction model was established.EDEM software was used to simulate the control components for the soil flow direction of the hilling machine for compound cutting.The design method with a two-factor comprehensive test was used to study the linear velocity along the outer part of the spiral knife and the influence of the forward velocity of machine of the implement on the soil cultivation effect.The results of the discrete element simulation showed that both the linear velocity along the outer part of the spiral knife and the forward velocity of the machine have extremely significant effects on the transportation of particles to the ridge top and the hilling thickness.Following multiple comparisons of the average hilling thickness with different linear velocities along with the outer spiral knife and different forward velocities of the machine,it is concluded that the performance of the mac

关键词： compound cutting hilling machine flow direction control discrete element method design

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Performance analysis of a spring-tooth drum pickup of straw baler via coupling simulation

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 159-165页

作者： Qingqing Wang Yongcheng Jiang lianhao li Junwei Qin liqing Chen School of Engineering Anhui Agricultural UniversityHefei 230036China Laboratory of Engineering of Intelligent Agricultural Machinery Equipment Anhui ProvinceHefei 230036China School of Mechanical Engineering Jiamusi UniversityJiamusi 154007HeilongjiangChina School of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China

In order to solve the problem of poor working performance due to incidental picking-up loss of a spring-tooth drum pickup,the coupling analysis approach of Automated Dynamic Analysis of Mechanical Systems(ADAMS)and Discrete Element Method(DEM)was proposed to reveal its motion characteristics.The coupled ADAMS-DEM method was used to construct the pickup simulation model with rice straw as the object.The validation tests were carried out in the field with different operating forward speeds and straw coverages.The results showed that when the baler worked with a rake,the straw loss rate tended to rise with the increase of the operating speed and the straw coverage.Tests results indicated periodic peaks and valleys of the forces between the rollers and the track chute,which could increase the wear of the track chute.In addition,the movement and variation of the straw and the distribution of different straw lengths after picking up were analyzed.The research results can provide a reference for the design and optimization of a pickup in the later period.

关键词： ADAMS-DEM coupling loss rate pickup straw coverage straw baler

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Optimized design and experiment of a fully automated potted cotton seedling transplanting mechanism

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International Journal of Agricultural and Biological Engineering 2020年第4期13卷 111-117页

作者： Xianglei Xue lianhao li Chunlin Xu Enquan li Yujie Wang College of Engineering Northeast Agricultural UniversityHarbin 150030China College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China

In order to improve the accuracy and stability of transplanting machine seedling picking,a seedling pick-up mechanism was designed,which was controlled by a controller and driven by brushless DC servo motor.At the same time,the parameters of the seedling manipulator were optimized:the mathematical model for the seedling pick-up mechanism was established.According to the predetermined trajectory requirements,the objective function and constraint conditions were proposed,and then the optimal size was obtained by a multi-objective genetic algorithm.At last,Automatic Dynamic Analysis of Mechanical Systems(ADAMS)software was used to simulate and analyze the kinematics and trajectory of the seedling pick-up mechanism,and the mechanism was tested to verify the effectiveness of the mechanism prototype.The experiments showed that the success rate of seedling picking was 94.32%,the rate of acceptably planted seedlings was 96.67%,and the rate of excellently planted seedlings was 63.48%.

关键词： cotton seedling transplanting machine kinematic model optimized design test full automation

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美国散居外交的行为体间关系的类型分析

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肇庆学院学报 2024年第4期45卷 9-14页

作者：隆德新李连浩广东外语外贸大学国际关系学院广东广州510006

通过对散居外交中以美国国务院为代表的外交部门与散居社群间形成的多种组织间关系的比较分析,为散居外交的概念化提供理论基础。本文根据资源依赖程度和性质上的不同,将美国与散居的组织间关系分为斡旋咨询、依从、游说和公私伙伴四种... 详细信息

通过对散居外交中以美国国务院为代表的外交部门与散居社群间形成的多种组织间关系的比较分析,为散居外交的概念化提供理论基础。本文根据资源依赖程度和性质上的不同,将美国与散居的组织间关系分为斡旋咨询、依从、游说和公私伙伴四种。美国散居外交是将散居社群的意见纳入相关外交政策制定与执行过程中,加强和深化美国与世界各地外交关系的重要方式。

关键词：散居外交伙伴关系美国

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Improvement and optimization of preparation process of seedling-growing bowl tray made of paddy straw

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International Journal of Agricultural and Biological Engineering 2014年第4期7卷 13-22页

作者： li lianhao Wang Chun Zhang Xinyue li Guangyong College of Water and Civil Engineering China Agricultural UniversityBeijing 100083China College of Engineering Heilongjiang Bayi Agricultural UniversityDaqing 163319China

A new type of rice seedling carrier named seedling-growing bowl tray made of paddy straw(SGBTMPS)was developed in China.Traditional preparation process for SGBTMPS is complex and difficult to operate.Hence,a new SGBTMPS preparation method has been developed by using straw powder as the main raw material.In this method,modified starch-based adhesive was replaced by the binder of thermosetting adhesive,and preparation constraints such as forming pressure,forming temperature,and dwell time were decreased.The effects of factors such as glue(modified starch-based adhesive),forming pressure,forming temperature and dwell time on SGBTMPS preparation were evaluated by single factor experiment.Orthogonal experiment and comprehensive weight analyses were adopted to optimize the parameters for SGBTMPS preparation.The results showed that optimized parameters were 125% glue and 1.2 kg mixed materials with the forming pressure,temperature,and dwell time of 30 MPa,140℃ and 330 seconds,respectively.Compared with traditional preparation process,the proportioning link,preparation link,and preparation time in the new preparation process were reduced by 66.7%,33.3%,and 17%,respectively;the pot-hole percentage and the expansion ratio were increased by 0.09% and 0.05%,respectively.This study indicated that the new preparation process for SGBTMPS was simpler and easier to operate and would provide a useful reference for further research and industrialization on SGBTMPS.

关键词： seedling-growing bowl tray preparation process paddy straw rice production modified starch-based adhesive straw powder

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Design and optimization of seedling-feeding device for automatic maize transplanter with maize straw seedling-sprouting tray

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International Journal of Agricultural and Biological Engineering 2015年第6期8卷 1-12页

作者： Zhang Wei Niu Zhaojun li lianhao Hou Yongrui College of Engineering Heilongjiang Bayi Agricultural UniversityDaqin g163319China Tropical Agricultural Machinery Research Institute Chinese Academy of Tropical Agricultural SciencesZhanjiang 524091China

This research aimed to solve current problems in the process of maize transplanting in China such as large labor intensity,low working efficiency and poor quality.On the basis of the structure of a seedling-sprouting tray made of maize straw and the agronomic requirements of maize production,this study developed a new feeding device for such a sprouting tray,determined the dimensions of the key components in a virtual environment via Solid Edge software and obtained optimal working parameters in combination with Matlab.Some tests on field validation and maize production were conducted as well.The test results showed the importance of the working parameters on an upright degree in descending order(as well as the best working parameters)to be the vertical angle of seedling planting(13.14°),the forward speed of locomotion(0.57 m/s),and the horizontal angle of the seedling box(22.5°).The standard deviation of the field validation was 6.04%,which was within the allowable range to meet the requirements of maize transplanting.Compared with maize transplanting machines(and manual transplanting operations)on the current market,the labor inputs,as well as the rates of spacing and upright degree qualification,omitted planting and the yield using the new feeding device for automatic transplanter with maize straw seedling-sprouting trays increased 0(6.9%),0(3.1%),0(4.5%)and 0(−1.0%),respectively;whereas,the manufacturing cost was reduced by 35.5%.The results can provide a technical basis and reference for subsequent development of automatic transplanters with maize straw seedling-sprouting trays.

关键词： maize seedling-sprouting tray automatic maize transplanter seedling-feeding device optimization

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Optimization of working parameters for puddling and flatting machine in paddy field

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International Journal of Agricultural and Biological Engineering 2016年第3期9卷 88-96页

作者： Xu Chunlin Zhang Chengliang li lianhao li Mingjin College of Engineering Northeast Agricultural UniversityHarbin 150030China College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China Harbin Agricultural Mechanization Research Institute Harbin 150070China

In order to improve the soil preparation quality,a wide puddling and flatting machine for paddy field was designed with the functionality of tillage,soil crushing,puddling,burying stubble and flatting in one-time operation,which can be equipped on tractors with high power.This study focused on the design and analysis of key components of the machine including puddling equipment,flat shovel and balance structure.Optimal results with field trials and response surface analysis showed that the machine can operate optimally when the working speed,puddling depth and angle of flat shovel were 1.05 km/h,16 cm and 31.30°,respectively.The surface flatness standard deviation was 3.7 cm,and slurry degree was 1.03 g/cm3.Field validation test results were consistent with the optimal parameters,which was able to meet agronomic requirements of mechanical planting in China.

关键词： paddy field puddling and flatting machine rice production design field test optimization

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Analysis of the decrease of center pivot sprinkling system uniformity and its impact on maize yield

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International Journal of Agricultural and Biological Engineering 2016年第5期9卷 108-119页

作者： li lianhao Zhang Xinyue Qiao Xiaodong liu Guiming College of Mechanical and Electronic Engineering Henan Agricultural UniversityZhengzhou 450002China Collaborative Innovation Center of Biomass Energy Zhengzhou 450002China College of Engineering Heilongjiang Bayi Agricultural UniversityDaqing 163319China Chinese Academy of Agricultural Mechanization Sciences Beijing 100083China

Early studies showed that the irregular operations of the center pivot sprinkling system would decrease its uniformity while the reason was lack of discussion.Taking Herman-Hein uniformity coefficient(CUH)and Distribution uniformity coefficient(DU)as evaluation indicators,the reason that irregular operation management and configurations can decrease the uniformity of center pivot sprinkling irrigation was discussed and the impact on maize yield was tested.The reasons for such decrease in uniformity include:(1)With the increase of moving speed,the effect of sprinkling overlaying became worse,which resulted in the lower uniformity of sprinkling irrigation;(2)With the increase of head pressure,the inlet pressure could be adjusted to the same pressure by pressure regulator,which kept the uniformity of sprinkling irrigation constant;(3)When end gun worked abnormally,total head pressure decreased,which led to the decrease of sprinkling irrigation’s uniformity;(4)When pressure regulator worked abnormally,the water flow was subject to great pressure loss,which could decrease the uniformity of sprinkling irrigation;(5)When pressure regulator was uninstalled,significant abnormality of sprinkling irrigation depth occurred,resulting in the decreasing of sprinkling irrigation’s uniformity;(6)Different types of nozzles could produce different uniformity of sprinkling irrigation,which was due to different structures of micro-nozzles;(7)Due to lower uniformity,at the seedling stage of maize,both height and seedling emergence rate decreased.Final yield decreased by 18.35%.This study is important to the proper use and the improvement of configuration selection and field management of center pivot sprinkling system.

关键词： center-pivot sprinkling system uniformity maize yield

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Development and evaluation of power consumption model for no-till planter based on working parameters

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 80-87页

作者： Gao Dongming li lianhao Qiao Xiaodong Khokan Kumer Sarker College of Material and Mechanical Engineering Beijing Technology and Business UniversityBeijing 100048China College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China Beijing Research Center of Intelligent Equipment for Agriculture Beijing 100097China Bangladesh Agricultural Research Institute(BARI) Gazipur 1701Bangladesh

In order to fully understand the relationships of power consumption of no-till planter among tractor,soil properties and working parameters which affect the field operation,the power consumption model for no-till planter applied to overcome the coupling difficulties was developed in the study.Based on operation depth of no-till planter and soil properties as constraints in accordance with a certain distribution,the relationship data among traction force,forward speed and power output shaft by field test were collected and analyzed.The results showed that the relationship between traction power and power-take-off(PTO)power was negatively correlated.Under the same power consumption condition,the relationship between traction force and the PTO torque was linearly correlated,and the slope was basically consistent.Different power consumptions corresponded to different intercepts.When the forward speed was 6-7 km/h and PTO shaft rotational speed was 370-450 r/min,lower power consumption with higher working efficiency can be achieved.There was a direct correlation between total power consumption and the square of rotational speed multiplied by forward speed.The maximum correlation coefficient was found around 0.82.The findings set up a foundation for designing control system of no-till planter.

关键词： no-till planter power consumption models working parameters evaluation

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烟草喷雾机气流场数值仿真及试验验证

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农机使用与维修 2024年第2期 6-10页

作者：王龙飞马留威李连豪范沿沿李建华朱晨辉张振韩硕刘炳旭河南省烟草公司许昌市公司河南许昌461000 河南农业大学机电工程学院郑州450002

为了探究烟草喷雾机风送系统气流分布情况,利用数值仿真与试验验证相结合的方法分析气流场分布规律。结果表明:1)该喷雾机气流场中气流在喷筒内导流柱两侧分布均匀,喷筒出风口截面处气流分布的仿真结果与实测结果之间相对误差较小且分... 详细信息

为了探究烟草喷雾机风送系统气流分布情况,利用数值仿真与试验验证相结合的方法分析气流场分布规律。结果表明:1)该喷雾机气流场中气流在喷筒内导流柱两侧分布均匀,喷筒出风口截面处气流分布的仿真结果与实测结果之间相对误差较小且分布趋势一致,证明了仿真模型的合理性和有效性;2)风速与测量位置到出风口截面距离的线性回归方程为y=13.29-9.49x,相关系数为0.721。仿真及试验结果为后续风送系统的优化设计提供了参考。

关键词：烟草喷雾机气流场数值分析

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