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black box concept
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  相似匹配句对
     Revelation of Black Box
     黑箱的启示
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     Black,M.
     Black,M.
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     Optical experiment on black box
     光学“黑盒子”实验
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     Valmet Blow Box Concept
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  black box concept
Control systems for both DC and AC trucks today have mostly gravitated to a black box concept.
      


Applying the' black box' concept of modern control theory, a dynamical simulation method of directly determining the water up-take by plants was advanced,to avoid the difficulties in estimating root distributions,while trying to determine water use. And, following the law of iterative addition of linear systems, the very complex SPAC system was broken down into two much simpler systems to make solutions to the problem and the related experiments more convenient and much easier.The simulation...

Applying the' black box' concept of modern control theory, a dynamical simulation method of directly determining the water up-take by plants was advanced,to avoid the difficulties in estimating root distributions,while trying to determine water use. And, following the law of iterative addition of linear systems, the very complex SPAC system was broken down into two much simpler systems to make solutions to the problem and the related experiments more convenient and much easier.The simulation method was applied to estimate water use by (peach) trees. A modified water up -take model (function) and its parameter identification were suggested. The validities of the simulation method and the modified water up-take model were verified.

本文根据现代控制理论中“黑箱”理论的思想,提出了一种直接采用土壤水瞬态运动模拟方法求得吸水项的方法,从而省去了试图估计根系分布的困难。并且在估计方法中采用线性系统的叠加原理,对SPAC系统进行分解与叠加,将异常复杂的SPAC系统的求解过程简化为对几个相对简单得多的子系统的求解,从而使得相应的求解与验证实验更加简单和方便。给出了采用交替方向的P—R有限差分二维模拟算法的计算表达式。并在估计桃树吸水模型中得到应用。提出了修正的桃(果)树吸水模型(函数)及其参数估计方法。对方法及模型的正确性进行了验证。

According to field experments and results from literature,based on the “black boxconcept of control theory,the change of soils in surge flow irrigation and the formation of surface sealing are summed up.The change of soil performance in surge irrigation is described by the saturated conductivity( k s )and Manning′s friction parameters(n) of surface sealing.The infiltration structure model of intermittent application is suggested.The k s and n are measured expermentally.A method for...

According to field experments and results from literature,based on the “black boxconcept of control theory,the change of soils in surge flow irrigation and the formation of surface sealing are summed up.The change of soil performance in surge irrigation is described by the saturated conductivity( k s )and Manning′s friction parameters(n) of surface sealing.The infiltration structure model of intermittent application is suggested.The k s and n are measured expermentally.A method for the solution to k s value is presented.

根据田间试验、前人的研究成果及现代控制理论中“黑箱”理论的思想,作者提出波涌灌入渗的结构模型。进而提出定量描述波涌灌土壤性能变化的指标表面密实层的饱和导水率ks和糙率n值。利用成层土壤入渗理论推导出求解表面密实层饱和导水率ks的公式,设计出定量测定有关参数的试验方法,并用入渗仪定量测出有关参数的量值。同时研究了表面密实层饱和导水率ks与土壤机械组成、土壤容重、供水中断时间的定量关系。建立了表面密实层饱和导水率ks的求解模型,并且用试验方法定量测出表面密实层的糙度n值,n值约为0.025。为波涌灌效果的描述及波涌灌系统模拟奠定了基础。

 
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