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Estimation of the soil water retention curve (SWRC) using pedotransfer functions
continuous pedotransfer function soil water retention curve fitting parametric method neural network
2015/1/30
Soil hydraulic characteristics, especially the soil water retention curve and hydraulic conductivity, are essential for many agricultural, environmental, and engineering applications. Their measuremen...
基于分形理论的水稻单产计算机视觉预测技术(Per-square-meter Yield Estimation of Paddy Based on Fractal Analysis)
水稻 单产 预测 计算机视觉 分形
2010/12/29
以武育粳3号为试验品种,用自制计算机视觉系统,拍摄成熟期水稻群体图像,应用分形理论分析水稻群体图像的分形特征,在此基础上提取了图像的差分计盒维数和多重分形曲线;并进一步分析得出水稻单位面积产量与水稻图像分形维数具有线性相关关系,最后建立水稻单位面积产量模型,模型精度为92.57%。
基于柴油机局部时段振动加速度的缸内燃烧状况(Combustion Estimation Based on Vibration Acceleration Signal from Start of Combustion to Peak Pressure Appearance Timing)
柴油机 缸内燃烧状况 振动加速度 特征参数
2010/12/29
柴油机燃烧峰值压力出现前燃烧过程对应的局部振动信号与缸内燃烧状况密切相关。对比分析了195型及495T型柴油机在该局部时段内振动加速度、缸内压力及其各阶导数的时域波形,基于波形间的相关性,提出了利用振动加速度信号的拐点推测燃烧过程特征点的方法。对比不同工况时局部时段内的缸内压力、压升率、振动加速度及压力升高加速度的时域波形及频谱能量,发现振动加速度信号最大时域波动量及特定频带的能量与缸内燃烧状况密...
传动装置密封环热负荷评估与试验Analytical and Experimental Method of Thermal Load Estimation for Seals in Transmission of Vehicle
涨圈型密封环 热负荷 温度场
2009/11/3
应用数值计算和试验研究相结合的方法对车辆传动装置密封环的热负荷特性进行评估。根据传动装置涨圈型密封环的工作特点,确定了密封环传热规律,提出了密封表面摩擦热的计算方法,获得了传热过程的边界条件。模拟实际运行工况,采用热-结构耦合方法对密封环整体的温度分布、热应力、变形量,以及温度随工况的变化规律进行仿真计算。利用研制的动密封综合性能试验系统进行试验对比论证和相关研究。结果表明,所提出的热负荷评估方法...
G). The total number, the total perimeter and total area of citrus were computed from the segmented image. The relationship between each image parameter and citrus yield was analysis. The result of ex...
A Comparison of Recursive Least Squares Estimation and Kalman Filtering for Flow in Open Channels
Optimal control Least squares estimation Kalman flters Open-channel flow
2009/10/10
An integrated approach to the design of an automatic control system for canals using a Linear Quadratic Gaussian regulator based on recursive least squares estimation was developed. The one-dimensiona...