搜索结果: 1-12 共查到“农业工程 methods”相关记录12条 . 查询时间(0.171 秒)
Study of fuel consumption in three tillage methods
maximum tillage reduced tillage no-tillage
2014/11/28
Fuel consumption per hectare of tilled land for the conventional or maximum tillage, reduced tillage using a multi-task
machine, and no-tillage using a direct drill planter has been studied and comp...
Multivariate statistical methods as a tool of financial analysis of farm businesses
financial analysis financial ratios multivariate statistical methods correlation analysis discriminant analysis cluster analysis
2014/3/26
The paper is focused on the evaluation of the possibilities of analysing the relations between economic and financial indicators of farm businesses by the application of multivariate statistical metho...
浑善达克沙地天然植被蒸散量两种计算方法的比较（Comparison of Evapotranspiration of the Natural Vegetation in the Otindag Sandy Area Using Two Calculation Methods）
沙地 天然植被 蒸散量 SWAP模型
2010/12/29
以土壤-水分-大气-作物系统模拟模型——SWAP模型和FAO-56分册推荐的最新双作物系数法为基础，计算浑善达克沙地天然植被蒸散量。结果表明：SWAP模型和最新双作物系数法模拟的蒸散量结果相近，均可用于模拟蒸散量。SWAP模型能模拟土壤剖面的水分动态。
基于多变量频域控制方法的车辆底盘集成控制（Integrated Chassis Control Based on Multivariable Frequency Domain Control Methods）
车辆 底盘集成控制 多变量系统
2010/1/28
提出了一种基于多变量频域控制方法的车辆底盘集成控制策略，协调控制车辆主动转向系统和主动制动系统。对典型多变量车辆系统进行分析，应用多变量频域控制理论设计底盘集成控制器，并利用基于Matlab与AMESim的联合仿真平台进行典型工况仿真分析。结果表明，基于多变量频域控制方法的车辆底盘集成控制器能够消除主动转向系统和主动制动系统之间的干涉和耦合，同时显著提高车辆操纵稳定性。
加工路径段进给速度的转接及加减速处理方法（Transiting and Acceleration/Deceleration Methods for Feed-speed of Machined Path Segments）
高速加工 进给速度 加减速
2010/1/28
针对高速高精加工对数控系统在进给速度控制方面的要求，根据相邻路径段间的转接角大小建立了可直接进行段间转接的条件,并研究了该条件不成立时对转接速度的修正问题。提出了段内加减速的处理基本原则,并在保持路径段长度不变的基础上对路径段内的进给速度重新进行规划，避免了以往插补前加减速方法中减速点和终点预测困难的问题。实际计算结果表明，相对零速度转接加减速处理方法，所提出的方法在同样保证加工精度等基础上提高了...
盘式吸渗仪吸渗率计算方法比较（Comparison among Permeability Methods of Disc Infiltrometer）
吸渗率 盘式吸渗仪 计算方法
2009/9/25
选用盘径为5cm和15cm的盘式吸渗仪，对杨凌塿土（粘土）和神木砂黄土（砂壤土）两种质地的土壤在0、－3、－6、－9、－12cm 水头5种负压下进行了室内吸渗实验，分析了不同盘径和负压对累积吸渗量的影响；并选用4种吸渗率公式对这两种质地土壤吸渗率进行了计算，以Vandervaere法为参考方法对该4种方法的适用性进行了分析。结果表明，在相同的时间内，两种土壤5 cm盘径下的累积吸渗量均大于15 c...
形态非抽样小波在主减速器振动特征提取中的应用（Feature Extraction Methods of Vibration Signal in Automobile Main Reducer Based on Morphological Un-decimated Wavelet）
故障诊断 特征提取 主减速器 形态小波 非线性 Hilbert包络
2010/4/1
针对形态小波分解过程的抽样引起信号长度逐层递减的问题，提出一种基于多尺度形态开闭级联滤波的形态非抽样小波构造方法。利用形态非抽样小波的一般框架，采用形态开闭级联滤波作为形态非抽样小波分解的近似信号的分析算子，使形态小波分解过程中信号长度保持不变，从而保证了形态分析时所需的信息量。主减速器振动信号特征提取试验验证了该方法能够有效提取非线性振动信号的特征，较原形态非抽样小波和线性小波有更好的滤波效果，...
基于小波变换的大米直链淀粉波长选择方法（Region Selecting Methods of Near Infrared Wavelength Based on Wavelet Transform）
直链淀粉 近红外光谱 小波变换 波长选择
2010/2/26
提出了一种基于小波变换的近红外光谱波长选择方法，小波分解低频系数是原光谱的离散近似，将最佳小波分解低频系数与原光谱数据进行关联，求出小波分解低频系数与原光谱数据的列相关系数R，取与原光谱数据相关系数较大的波长组合，作为最后参与建模的谱区。不仅考虑了浓度矩阵对波长选择的影响，且由于把小波分解结构中的高频系数全部滤除，避免了高频噪声的干扰，减小建模和预测运算时间，使最终建立的近红外光谱模型的预测精度提...
Comparison of Different Irrigation Methods Based on the Parametric Evaluation Approach
Irrigation Parametric Evaluation Soil Characteristics Geographic Information System (GIS)
2009/1/12
The main objective of this research is to compare two different irrigation methods according to parametric evaluation system in the Field Plants Central Research Institute-Ikizce Research Farm's soils...
An Evaluation of Alternative Cotton Harvesting Methods in Northeast Louisiana - A Comparison of the Brush Stripper and Spindle Harvester
Evaluation Cotton Harvesting Methods Northeast Louisiana Comparison Brush Stripper Spindle Harvester
2008/12/15
In response to increases in cotton production costs, producers are seeking ways to reduce input expenses. Because brush strippers are less expensive to operate than spindle harvesters, research was pe...
Research specificity and standardization of agrophysical methods on the example of investigations in soil physics
agrophysics agrophysical method standardization
2014/2/28
The study presents agrophysics as an interdisciplinary branch of science dealing with the application of physical methods to examine the properties of agricultural materials and products as well as pr...
Multivariate statistical methods as a tool of financial analysis of farm businesses
financial analysis financial ratios multivariate statistical methods correlation analysis discriminant analysis cluster analysis
2014/3/26
The paper is focused on the evaluation of the possibilities of analysing the relations between economic and financial indicators of farm businesses by the application of multivariate statistical metho...