搜索结果: 1-15 共查到“农业工程 impact”相关记录15条 . 查询时间(0.098 秒)
Monitoring the impact of tyre inflation pressure on tensile properties of forest tractors
tractive power tensile strength forest soil slippage
2014/11/28
The article discusses monitoring of the impact of tyre inflation pressure on tensile properties of forest tractors. The
LKT 81 T forest tractor, manufactured by ZŤS TEES, Martin (Slovak Republi...
大豆内部机械损伤对发芽的影响（Inner Mechanical Damage Impact to Germination of Soybean Kernels）
大豆种子 内部损伤 发芽试验
2010/12/29
以辽宁省3个主栽大豆品种为对象，研究了内部损伤特征对大豆发芽率的影响。结果表明，机械脱粒引起的大豆各种内部损伤，如子叶断裂、子叶破裂、胚根断裂和胚轴损伤等多种形式同时存在，内部机械损伤不易发现并影响发芽，具有严重的潜在危害性。
双板差分冲量式谷物流量传感器性能试验（Experiment of Dual-plates Differential Impact-based Grain Flow Sensor）
谷物 流量传感器 冲量式
2010/12/28
对双板差分冲量式谷物流量传感器的静态受力特性进行检测，结果表明传感器的输出信号与静态力作用点的位置无关,即传感器的线性度满足使用要求。室内标定试验和田间测产试验得到谷物流量在0～2.0kg/s范围内信号与传感器输出电压信号的关系和标定系数K。田间水稻测产试验检测测产精度误差小于3.8%。
Impact of soil compaction in sowing on development and crops of sugar beet
sowing sugar beet soil compaction combination of working operations
2014/2/26
Putting together work operations minimizes the number of machine passes across the plot, which helps to reduce negative soil compaction and to save fuels. However, the combination of working operation...
PY140型摇臂式喷头摇臂碰撞过程数值模拟（Numerical Simulation of Swing Arm Impact Process to the PY140 Impact Sprinkler）
摇臂式喷头 碰撞 有限元模拟
2010/1/28
基于显式动力分析软件ANSYS/LS-DYNA，建立了摇臂式喷头摇臂绕轴旋转、碰撞喷体的有限元分析模型，在3种摇臂转动角速度和喷体安装弹性橡胶垫与否的组合工况下，对摇臂与喷体的碰撞过程及动应力分布进行了计算模拟。结果表明，PY140型摇臂式喷头在转动角速度400(°)/s时，计算的碰撞动应力峰值为42.3MPa，与试验值的误差小于0.5%，预测的发生位置距离摇臂转轴中心15cm，与试验结果相同。摇...
机身倾斜导致谷物流量传感器零点漂移的补偿（Zero-drift Compensation of Impact-based Grain Flow Sensor for Tilted Combine Harvester）
冲击式 谷物流量传感器 零点漂移
2009/11/3
当联合收获机倾斜时谷物流量传感器因发生严重的零点漂移而导致较大的测量误差。通过对单板冲击式谷物流量传感器的倾斜试验发现，传感器的零点电压与联合收获机的倾斜角度成线性关系，当联合收获机左右倾斜15°时，零点漂移电压达25.4 mV，可能导致-8.3%～28%的测量误差。为了消除倾斜导致的零点漂移，在单板冲击式流量传感器后面增加一个与冲击板结构相同的参考检测板，构成双板差分冲击式谷物流量传感器。倾斜试...
基于计算机视觉与敲击振动融合技术检测鸭蛋壳强度（Duck Egg’s Shell Intensity Model Based on Fusion of Computer Vision and Impact Excitation）
鸭蛋 蛋壳强度 多传感器融合 数据关联
2009/9/11
通过对敲击振动特征频率矩阵变异系数和测定有裂纹蛋壳强度的探索性分析，获得鸭蛋壳强度特征频率的分离阈值λ=0.02。通过传感器数据关联，确定了进入模型的特征变量。采用后向消去法进行多元线性回归建立了无裂纹鸭蛋壳强度预测模型，结合蛋壳强度分离阈值得出基于特征层多传感器融合鸭蛋壳强度的系统模型。验证性试验表明该模型有较好适应性，对于各种颜色、形态鸭蛋的蛋壳强度都有较好的预测效果，误差均值小于3.1%，误...
谷粒冲击压电力敏元件数值模拟与试验（Numerical Simulation and Test of Grain Impact Piezoelectric Yield Sensor谷粒冲击压电力敏元件数值模拟与试验Numerical Simulation and Test of Grain Impact Piezoelectric Yield Sensor）
谷粒 冲量式测产传感器 数值模拟
2009/8/11
设计了一种冲量式谷物质量流量压电传感器。应用显式动力学软件LS—DYNA建立了谷粒—力敏元件冲击有限单元模型，数值模拟了谷粒冲击力敏元件的过程，研究了力敏元件材料对冲击过程的影响。应用LabView软件和高性能压电陶瓷，开发了谷粒冲击力敏元件的物理样机试验系统，对数值模拟结果进行了检验。数值模拟和试验研究的结果表明：在1Cr18Ni9、聚丙烯和陶瓷(Si3N4)3种力敏材料中，陶瓷(Si3N4)是...
旋转机械碰摩转子系统的可靠性灵敏度设计（Reliability Sensitivity Design for Rub-impact Rotor System of Rotating Machinery）
转子系统 随机摄动 可靠性
2009/8/11
在碰摩转子系统动力学方程的基础上，将可靠性设计理论与灵敏度分析方法相结合，应用随机摄动理论、Kronecker代数、四阶矩技术和矩阵微分理论，讨论了具有随机参数的转子系统碰摩的可靠性灵敏度问题，提出了转子系统可靠性灵敏度设计的数值方法，给出了碰摩转子系统随机参数统计特性可靠性灵敏度的变化规律，研究了转子系统随机参数统计特性的改变对碰摩转子系统可靠性的影响，为转子系统的可靠性设计提供了理论依据。数值...
冲击载荷下磁流变变刚度变阻尼缓冲系统减振控制（Absorbing Control of Magneto-rheological Variable Stiffness and Damping System under Impact Load）
磁流变液 半主动控制 变刚度 冲击载荷
2010/4/1
针对传统缓冲着陆装置阻尼刚度不可调节的局限性，提出采用基于磁流变技术的自适应变阻尼变刚度缓冲装置。首先从理论上研究了采用磁流变阻尼器实现刚度阻尼等效控制的原理，分析了刚度阻尼调节范围；进而设计了基于能量守恒原理和天棚阻尼控制技术的飞行器缓冲着陆的自适应控制器，最后通过数值分析考察缓冲器和控制策略的有效性。分析结果表明，与被动缓冲装置相比，基于磁流变技术的缓冲装置不仅能降低着陆冲击过程的峰值载荷，而...
Geomatics Analysis of the Impact of Predicted Sea-Level Rise on the Agriculture along the Coastal Zone of Andhra Pradesh
Climate Change Seal-level Rise Coastal Land use Agriculture Vulnerability
2016/4/7
Global warming induces steric as well as eustatic rise in sea-level, by thermal expansion and addition of ice-melt water, respectively. Although the IPCC (2007) estimated a maximum possible sea-level ...
Impact of semitrailer tyre pressure upon passive resistance and tractor unit operation economy
lost powerspeedrollingtyre pressurefuel consumption
2014/2/26
The aim of the measurement was to establish and prove the effect of the semitrailer tyre pressure on the magnitude of power losses and energy intensity in a tractor unit operation. The measured and ca...
External factors and their impact on the metabolism and technological quality of stored sugar beet
sugar beet storage losses sugar content
2014/2/28
Technological quality of sugar beet is a complex of biological, chemical, physico-chemical and mechanical properties of the sugar beet root, which are conclusive to decide upon a proper warehousing an...
Impact of Common Agricultural Policy on Czech agriculture
standard direct payments single area payments production regions reform of CAP, HRDP
2014/3/29
This contribution describes eight variants of the distribution of the direct payments and their impact on the farm economies in the years 2004–2006. For this purpose, selective set of 152 farms was di...
Impact of agricultural sector on the economic situation of NUTS III regions in the Czech Republic
Czech Republic agriculture higher territorial administrative units unemployment GDP per capita rural development
2014/3/26
In all developed economies of the world there was, in the past, a significant decrease in the share of agriculture with regard to the Gross Domestic Product (GDP) and employment. However, it is still ...