检索结果-南通市图书馆

Design and experiment of high-speed straw cleaning unit with double air springs

International Journal of Agricultural and Biological Engineering 2024年第4期17卷 89-97页

作者： Xiaomeng Xia Honggang Li Shuyan Liu Ruiqiang Ran Yongjian Cong Yuhan Jin dongyan huang School of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China Jilin Agricultural Machinery Research Institute Changchun 130022China

No-tillage planters need to be equipped with row cleaners to remove post-harvest plant residue from the *** two-disc row cleaners cannot effectively remove the plant residue at high speed because the working depth is unstable,which leads to poor seeding quality of the seeder.A straw cleaning unit with double air springs was designed to achieve better straw cleaning performance at high *** analysis of the mechanical characteristics of the double air spring system showed that it enabled separate adjustment of force and stiffness.A dynamic model of the straw cleaning unit was established,and the effectiveness of the double air spring system with adjustable stiffness in stabilizing the working depth of the row cleaners was *** experiments were conducted to evaluate the straw cleaning performance and consistency of downforce against the ground of the straw cleaning unit with double air springs at different high *** results showed that the stiffness of the double air spring system for better straw cleaning performance of the straw cleaning unit was different at different working speed,and the required stiffness increased as the working speed increased;When the working speed was 8-12 km/h,the coefficient of variation of cleaned strip width was 6.9%-12.1%,the straw cleaning rate was 81.6%-92.2%and the root mean square error of downforce was 19.93-28.63 N;the coefficient of variation of cleaned strip width was moderately positively correlated with the root mean square error of downforce,and the cleaned strip width consistency was better when the root mean square error of downforce was lower than 25.00 N.

关键词： conservation tillage row cleaners straw cleaning unit double air spring system

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电力调度自动化越限定值一键下发方法的研究和思考

引用

电力系统装备 2024年第4期 73-76页

作者：韦玮黄冬燕黄冠琅林文光广西电网有限责任公司南宁供电局广西南宁530000

越限信息的实时监控对确保电网设备的安全运行有重大意义。随着调度自动化系统设备数量逐年增加,作业量和工作时间呈指数级变化,对提高数据实时性、准确性和安全生产提出了更高要求,改变原有的维护方式迫在眉睫。文章通过研发一键下发... 详细信息

越限信息的实时监控对确保电网设备的安全运行有重大意义。随着调度自动化系统设备数量逐年增加,作业量和工作时间呈指数级变化,对提高数据实时性、准确性和安全生产提出了更高要求,改变原有的维护方式迫在眉睫。文章通过研发一键下发工具实现了该项工作的自动化作业,提高了限值设置的效率,有效防止了因人为设置错漏而导致的漏告警或误告警风险,具有广阔的行业推广前景。

关键词：调度自动化 Python 越限定值一键下发

来源：

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

高硫无烟煤制备柱状活性炭对Cu^(2+)的吸附规律及影响机制

引用

洁净煤技术 2024年第1期30卷 124-133页

作者：赵金柯郭子一段晨龙黄冬艳董婷玉王皓雪周恩会中国矿业大学孙越崎学院江苏徐州221116 中国矿业大学化工学院江苏徐州221116 中国矿业大学经济管理学院江苏徐州221116

高硫无烟煤燃烧时会产生大量硫氧化物,破坏大气环境,随着环保要求日益严格,需寻求高硫无烟煤由传统燃料向高端材料发展的途径。由于活性炭制备与应用在特定领域尚无技术指标,造成制备目标模糊,活性炭定向制备问题亟需解决。采用晋城地... 详细信息

高硫无烟煤燃烧时会产生大量硫氧化物,破坏大气环境,随着环保要求日益严格,需寻求高硫无烟煤由传统燃料向高端材料发展的途径。由于活性炭制备与应用在特定领域尚无技术指标,造成制备目标模糊,活性炭定向制备问题亟需解决。采用晋城地区高硫无烟煤,通过物理活化法制备,并采用磷酸浸渍处理,得到了比表面积1066.42 m^(2)/g(AC-1)和1568.79 m^(2)/g(AC-2)的2种活性炭。采用FTIR、XPS、SEM等方法进行表征。结果表明,AC-1的最几可孔径为1.688 nm,AC-2的最几可孔径为0.718 nm,前者具有更发达的介孔结构。以Cu^(2+)为吸附质研究2种活性炭的吸附性能。结果表明,AC-1的吸附性能显著优于AC-2,吸附行为由孔径分布和表面官能团含量2个因素共同决定。最佳吸附条件为pH=4,温度35℃,活性炭投加量0.30 g,吸附时间2 h。动力学研究表明2种活性炭对Cu^(2+)的吸附过程均由化学吸附而不是颗粒内扩散控制。吸附等温线拟合结果表明Langmuir等温模型不适用于AC-2,这可能与其以物理吸附为主导有关。本研究讨论活性炭孔隙分布和表面官能团含量对其吸附性能的影响,为高硫无烟煤定向制备具有良好水相重金属离子去除能力的活性炭提供指导。

关键词：高硫无烟煤煤基活性炭孔隙分布铜离子净化吸附机理

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis and experiment on cutting performances of high-stubble maize stalks

引用

International Journal of Agricultural and Biological Engineering 2017年第1期10卷 40-52页

作者： Zhao Jiale huang dongyan Jia Honglei Zhuang Jian Guo Mingzhuo College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Key Laboratory of Bionics Engineering Ministry of EducationJilin UniversityChangchun 130025China

In the cold areas of Northeast China,maize high-stubble cutting is a novel stalk conservation tillage method,in which the maize stalks are under a unilaterally-fixed no-support cutting ***,reducing the cutting resistance and power consumption of maize stalks under this status is very significant for the development of high-efficiency high-stubble cutting *** on a self-designed testing system that highly restored the maize high-stubble cutting conditions and by means of experimental design and mathematic statistics,the effects of working parameters(blade angle,blade shape,cutting speed and cutting angle)on the maximum cutting resistance and power consumption were *** analyzing stress conditions during the stalk cutting process,six mathematic models were built to express the relationships between individual factors and the maximum cutting resistance or cutting power *** model optimization,the parameter combination for optimal cutting performance of maize stalks under unilaterally-fixed no-support cutting status was obtained:blade angle is 18°,blade shape is isosceles triangle,cutting speed is 9.5 m/s,and cutting angle is 75°.Field validation experiments under this parameter combination showed that the maximum cutting resistance was(55.23±3.50)N(declined by 11.04%),and power consumption was(11.41±1.04)J(declined by 16.65%).The research findings can be a reference for the design and development of maize high-stubble cutting devices.

关键词： cutting performances blade angle working parameters high-stubble conservation tillage mechanism analysis maize

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent sowing depth regulation system based on Flex sensor and Mamdani fuzzy model for a no-till planter

引用

International Journal of Agricultural and Biological Engineering 2021年第6期14卷 145-152页

作者： Mingwei Li Xiaomeng Xia Longtu Zhu Renyi Zhou dongyan huang School of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

Sowing depth has an important impact on the performance of no-tillage planters,it is one of the key factors to ensure rapid ***,the consistency of sowing depth is easily affected by the complex environment of no-tillage *** order to improve the performance of no-tillage planters and improve the control precision of sowing depth,an intelligent depth regulation system was *** Flex sensors installed on the inner surface of the gauge wheel at 120°intervals were used to monitor the downward force exerted by the seeding row unit against *** peak value of the output voltage of the sensor increased linearly with the increase of the downward *** addition,the pneumatic spring was used as a downforce generator,and its intelligent regulation model was established by the Mamdani fuzzy algorithm,which can realize the control of the downward force exerted by the seeding row unit against ground and ensure the proper seeding *** working process was simulated based on MATLAB-Simulink,and the results showed that the Mamdani fuzzy model performed well in changing the pressure against *** results showed that when the operating speed was 6 km/h,8 km/h and 10 km/h,the error of the system’s control of sowing depth was±9 mm,±12 mm,and±22 mm,respectively,and its sowing performance was significantly higher than that of the unadjusted passive operation.

关键词： Flex sensor Mamdani fuzzy model sowing depth intelligent regulation system no-till planter

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Design of bionic locust mouthparts stubble cutting device

引用

International Journal of Agricultural and Biological Engineering 2020年第1期13卷 20-28页

作者： Jiale Zhao Mingzhuo Guo Yun Lu dongyan huang Jian Zhuang College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China The Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

Given the technical problems of low maize stubble breaking efficiency,large cutting torque and high power consumption faced during springtime no-till planting in Northeast China,we designed a high-performance coupling bionic stubble cutting device capable by integrating the structure(multi-segment and serrate)and cutting mode(isokinetic and symmetrical)of locust *** of bionic construction,mechanism design,theoretical analysis,parameter optimization,Arduino systems and intelligent control were combined to design a planetary gear mechanism and an intelligent speed control *** particular,the bionic cutting blade could reconstruct the multi-segment and serrate structure of locust mouthparts,while the planetary gear mechanism and the intelligent speed control system jointly comprised the bionic drive system,which could simulate the isokinetic and symmetrical cutting mode,thereby bionically coupling morphological structures and movement *** of comparative tests showed the coupling bionic cutting device could reduce the cutting torque by 26.6%-31.6%and the power consumption by 21.9%-26.1%.This work confirmed that coupling bionic method can significantly improve the stubble cutting efficiency,which was a valuable contribution to the design of stubble cutting device for no-till planter.

关键词： bionics locust mouthparts cutting device corn stubble

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Design and key parameter optimization of an agitated soybean seed metering device with horizontal seed filling

引用

International Journal of Agricultural and Biological Engineering 2018年第2期11卷 76-87页

作者： Honglei Jia Yulong Chen Jiale Zhao Mingzhuo Guo dongyan huang Jian Zhuang College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Key Laboratory of Bionics Engineering Ministry of EducationJilin UniversityChangchun 130025China

Since the low seed filling speed of mechanical seed metering devices reduces the low qualified rate of seed spacing during high-speed practices,it is significant to design agitated seed metering devices with horizontal seed filling that are suitable for high-speed *** combination of horizontal seed filling and agitated seed filling can accelerate the seed filling of mechanical seed metering devices,and improve the qualified rate of seed spacing during high-speed *** this study,theoretical analysis,discrete element method-based simulation and indoor bench test verification were conducted to investigate how key parameters of the agitated seed metering device with horizontal seed filling(angles,installation position and number of agitating plates,diameters of convex spoons)would affect the characteristics of soybean seed movement,seed number and seeding performance(qualified index,multiple index,missing seeding index)under different working ***-based simulation,test design and regression analysis were combined to analyze the population moving rules and optimize the design parameters of seed metering *** on the test scheme as designed,simulations were conducted on Fluent EDEM,and the optimal angle of the agitating plates was determined by analyzing the population migrating *** equations were established through the regression of test results,and used to find out the optimal design parameters(diameter of convex spoon,positions and number of agitating plates)of seed metering *** the optimal parameter combination among different working conditions was determined that the angle,position and number of agitating plates were 30°,24.4 mm,and 13,respectively,and the diameter of convex spoon was 11.0 *** the optimal parameter combination and at the seeding speed of 12 km/h,the qualified index,multiple index and missing seeding index were 93.1%,2.1%and 4.8%,*** high-speed practices,the new seed meter

关键词： soybean seed metering device horizontal seed filling agitated seed filling high-speed precision seeding discrete element method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Maize(Zea mays L.)seedling detection based on the fusion of a modified deep learning model and a novel Lidar points projecting strategy

引用

International Journal of Agricultural and Biological Engineering 2022年第5期15卷 172-180页

作者： Gang Wang dongyan huang Deyi Zhou Huili Liu Minghao Qu Zhongyang Ma College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

Accurate crop detection is the prerequisite for the operation of intelligent agricultural *** recognition usually lacks accurate orientation information,and Lidar point clouds are not easy to distinguish different ***,the fusion of images and Lidar points can complement each *** research aimed to detect maize(Zea mays L.)seedlings by fusing Lidar data with *** applying coordinate transformation and time stamps,the images and Lidar points were realized homogeneous in spatial as well as temporal *** learning was used to develop a maize seedling recognition model,then the model recognized maize seedlings by labeling them with bounding ***,Lidar points were mapped to the bounding *** one-third of points that fell into the right middle of bounding boxes were selected for clustering operation,the calculated center of the cluster provided spatial information for target maize *** study modified the classical single shot multi-box detector(SSD)by merely linking the last feature map to the final output layer,owing to the higher feature maps having the unique advantages of detecting relatively larger *** images,maize seedlings were just the largest objects owing to be shot on *** modification enabled the recognition model to finish recognizing an image by only consuming around 60 ms,which saved about 10 ms/image compared with the classical SSD *** experiment was conducted in a maize field,and the maize was during the elongation *** results demonstrated that the standard deviations for maximum distance error and maximum angle error were 1.4 cm and 1.1°,respectively,which can be tolerated under current technical *** agricultural fields are subject to staple crop-orientated and changeable ambient environment,the fusion of images and Lidar points can derive more precision information,and make agricultural machinery *** study can act as an

关键词： maize seedling detection fusion deep learning Lidar

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Design and test of bionic wide-ridge soybean tilling-sowing machine

引用

International Journal of Agricultural and Biological Engineering 2019年第1期12卷 42-51页

作者： Honglei Jia Mingzhuo Guo Jiale Zhao dongyan huang Jian Zhuang Jiangtao Qi College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

The insufficient accumulated temperature of the plow layer during spring tillage in Northeast China severely restricts soybean root growth and whole-plant *** regional soil viscosity further complicates *** order to seek a solution to these problems,field comparative tests were conducted to investigate the effects of shallow-loosening(SL)and reshaping ridge(RR)on soil temperature and soybean root *** with conventional tillage(CT),SL and RR significantly increased the soil temperatures within 0-25 cm(p<0.05)and 0-15 cm(p<0.05),*** particular,higher soil temperature within 15-25 cm was established after SL than after RR(p<0.05).Additionally,SL promoted substantially more vigorous soybean development(seedling height)than RR(p<0.05),which in turn led to a significant outperformance over CT(p<0.05).Further,bionics,reverse engineering,and curve fitting were combined to design a hare claw toe bionic shallow-loosening shovel and a pangolin scale bionic ridging shovel with anti-drag *** verification tests confirmed that these two bionic tillage devices outperformed the conventional tillage device in reducing tractive drag by 13%-19%.Based on the results of these tests,a 2BGD-6(110)bionic wide-ridge soybean tilling-sowing machine was designed,which was capable of shallow-loosening,reshaping ridge and *** new machine significantly reduced the tractive drag,efficiently loosened the soil,increased soil temperature,and accelerated soybean root *** study can provide a theoretical and practical reference for soybean production in Northeast China.

关键词： bionics tillage shallow-loosening soybean reshaping ridge soil temperature

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Impacts of increasing maize stalk retention amount on soil respiration and temperature sensitivity

引用

International Journal of Agricultural and Biological Engineering 2022年第2期15卷 135-141页

作者： Hongfang Yuan Gang Wang dongyan huang Stephan Glatzel Jian Zhuang Honglei Jia College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Department of Geography and Regional Research University of ViennaVienna 1090Austria Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China

Conservation tillage with maize stalk retention is an effective method to replenish soil *** availability plays a major role in the control of soil respiration(SR).However,it is not known how different degrees of maize stalk retention control SR and its temperature sensitivity(Q_(10)).To investigate the effect of maize stalk retention amount on SR and Q_(10),four maize(Zea mays L.)stalk retention treatments,including(i)control treatment(CT)without maize stalk retention,(ii)standing maize stalk retention(SCR),(iii)partial maize stalk retention with‘three-year cycle’(TYR)and(iv)chopped maize stalk retention(CCR)was set *** order to investigate the differences in soil nutrient,soil organic carbon(SOC)quality and soil microbial biomass among four treatments,soil analysis with 6 replicates was *** experimental results showed that SR rates were 1.07,0.88,0.59 and 0.37 g/kg of dry soil,and the average Q_(10)was 1.535,1.585,1.62 and 1.725 for CT,SCR,TYR and CCR,*** maize stalk retention led to the reduction of soil microbial abundance and labile carbon *** correlation analysis showed that soil microbial abundance had a positive correlation with SR,while labile carbon fraction had a negative correlation with Q_(10).In short,increasing the amount of maize stalk retention decreases SR while increasing Q_(10)in northeast *** research could provide a reference value for balancing carbon sequestration and carbon decomposition in farming practice.

关键词： stalk management soil nutrient carbon composition microbial biomass laboratory incubation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：