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工作油温升对液粘传动调速起动的影响（Effect of Working Oil Temperature Rise on Hydro-viscous Drive Speed Regulating Start）
液粘传动 调速起动 温升 修正瞬态雷诺方程
2010/12/29
采用有限元法联立求解修正瞬态雷诺方程、热能量方程及润滑油粘温方程，对调速起动过程进行了数值模拟研究,讨论了起动过程中工作油温升对液粘传动调速起动的影响。结果表明，流入摩擦片工作油温度为30℃时，流经摩擦片后温度约升高20℃，它所引起的油膜承载力下降9%；而流入摩擦片工作油温度由30℃升至50℃时，即使不考虑流经摩擦片的温升，油膜承载力也将下降32%。这样易引起油膜承载力低于比例溢流阀死区对应压力，...
农用车辆作业环境障碍物检测方法（Obstacle Detection in the Working Area of Agricultural Vehicle Based on Machine Vision）
农用车辆 颜色分割 特征匹配
2009/11/3
针对联合收获机视觉导航系统中的视觉测障，提出了一种基于单目彩色图像分割测障与立体视觉特征匹配测障相结合的测障方法：利用H、S颜色分量对单目图像实施固定阈值分割并二值化，获得潜在障碍物的位置及区域；采用尺度空间不变(SIFT)算法获取潜在障碍物区域特征；采用近似最近邻分类算法(ANN)进行快速特征匹配，获得潜在障碍物的世界坐标，由此进一步确认障碍物以及障碍物与车辆之间的距离。提出了提高算法效率的措施...
轮胎压实对机具牵引阻力的影响（Effect of Wheel Traffic on Working Resistance of Agricultural Machinery in Field Operation）
保护性耕作 固定道 压实 牵引阻力
2010/2/26
研究了华北平原小麦、玉米一年两熟区固定道保护性耕作对机具田间牵引阻力的影响，对比分析了固定道与非固定道处理下机具田间作业的滚动阻力、开沟器牵引阻力和总牵引阻力。与非固定道保护性耕作时深松、小麦和玉米播种作业相比，固定道保护性耕作下机组总牵引阻力分别降低14.6%、13.3%和13.3%；滚动阻力分别降低26.9%、21.9%和19.7%，平均降低22.9%；机具牵引阻力分别降低7.5%、7.2%和...
Simulation mathematical model of expert system for working processes management
expert system simulation mathematical models agricultural technological systems
2014/2/26
The elementary simulation mathematical models presented in this article are related with the sub-system Crop production of the expert system for the decision support in technological and working proce...
The exposure of working environment noise in the agricultural service workplaces
auxiliary plants of agriculture noise load of service workers limits of noise exposure
2014/2/26
The noise belongs to the leading harmful factors which pollute the environment and negatively influences human health. An overview measurement concerning the noise characteristics has been done in agr...
Measuring of pulling resistance in machinery with passive working organs
tillage disk harrow measuring equipment field experiments
2014/2/27
A determination of the total pulling resistance of machinery is important in light of its dimensioning as well in light of energy requirements of processed operation. There are several methods to dete...
The effect of working conditions on the selected parameters of duckfoot shares
forces resistivity of loosening speed of operation depth soil moisture
2014/2/28
We measured a series of six duckfoot shares in the years 1999–2000. The purpose of the research project resulted from the Grant EP7111 and the Research project MSM J06/98:122200002/I. We described for...