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近似数值
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  numerical approximation
     The results from analytical solution were expected to be more accurate than those from numerical approximation solut ions.
     另外 ,循环迭代求解平板塑件温度场采用的是有限差分法 ,即近似数值解 ,而迭代模型采用的是解析解 ,从理论上讲结果更精确 ,所以对提高计算结果的精度有一定的改善作用。
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  approximate value
     APPROXIMATE VALUE SOLUTION IN HYDRAULIC CALCULATION OF UNIFORM-FLOW IN PARTLY FULL CIRCULAR PIPE
     非满流圆管均匀流水力计算的近似数值解法
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     Basing on the fundamental dynamic equations of drift current, this paper presents a numerical value solution to the computation of wind-driven currents in sea inlets and navigation channels with various water depths by the application of the approximate value method in terms of Ritz solution to variation.
     本文基于漂流理论基础方程式,应用Ritz求解变分问题的近似数值法,讨论浅海水深变化时,在海湾、航道内的风海流计算的一种近似数值解。
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  “近似数值”译为未确定词的双语例句
     The results thus obtained can be taken as the analytical foundation for the experimental determination of K_1 and provide an appropriate mechanical model for the approximate mumerieal analysis.
     该分析可以为K_1的实验确定提供分析基础,为近似数值计算法提供力学模型。
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     In order to obtain the algebraic equation of a limit cycle, the following equations are available:F(x, x) = F(x, x) F(x, x) = -F(-x, x) we may use the algebraic equation of limit cycle to check the accuracy of approximate numerical computation.
     为了便于求出极限环的代数方程,下列两式是很有用的。 F(x,x)=F(x,-x) F(x,x)=-F(-x,x)我们可将所求得的极限环的代数方程去校核近似数值计算的精确程度。
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     An approximate method to analyze the imaginary kingpin axis in five-link suspension systems
     确定五连杆悬架虚主销轴线的近似数值方法
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     The numerical computation has been done for ZnSe/Zn 1-x Cd x Se ADQW by using a simplified coherent potential approximation. The results show that the higher frequency modes are more important than the lower frequency modes for the e IO p interaction in the ZnSe/Zn 1-x Cd x Se system.
     使用简化的相干势近似数值计算 Zn Se/Zn1-x Cdx Se非对称双量子阱结构 ,结果表明高频声子与 IO声子的相互作用较低频声子与 IO声子的相互作用强
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     The simulations based on Matlab show that the parameters are more convenient to select and the results are more accurate than those based on approximation of Pade rational function to est.
     基于Matlab下的分析结果表明,与Pade有理函数对est的近似数值拉普拉斯反变换方法相比,该方法参数更容易选择,计算更准确。
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  相似匹配句对
     from precision to numerical approximation;
     从精确到数值近似;
     Numerical Simulation of Mathematical Model for Subcutaneously Injected Insulin
     皮下注射胰岛素数学模型的数值近似
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     (2) numerical simulation;
     数值模拟;
短句来源
     APPROXIMATE DISTRIBUTION OF x~m(n)
     x~m(n)的近似分布
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     The computational result is compared with G.
     数值结果和G.
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  numerical approximation
In this paper, the numerical approximation by Galerkin method for completely compressible miscible displacement with molecular diffusion and dispersion in porous media is considered.
      
It could eventually be used to validate those found by numerical approximation techniques.
      
We present here a numerical approximation for the Fe Kα emission line using analytical functions.
      
Second, based on the assumption that indexes are monotonic for the requirements, an algorithm is proposed and applied to numerical approximation of monotonic indexes requirement locus with hyperboxes.
      
In this paper we introduce and analyze a new approach for the numerical approximation of Maxwell's equations in the frequency domain.
      
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  approximate value
The article gives a comparison between the exact value of the parameter and an approximate value, obtained using the method of modulating functions.
      
Cleavage development, approximate value of rock contraction, and isotopic characteristics are compared with the available data on alteration of clay mineral assemblages.
      
Then, the approximate value of the most important exponent θ (h ∝ tθ) was judged from the slope of the h(t) curve in the lnt-lnh coordinates.
      
Yet, since the Josephson and magnetic components of the pinning energy have different signs, the exact value of the total pinning energy and the approximate value obtained within the continuous vortex model differ insignificantly.
      
This "meanτ/2 blood level" may be considered as an approximate value for extravasal tissue levels.
      
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In the reference [5], the author has suggested a method of vectorial graphicalcomputation of the undamped forced vibration of the system with one degreeof freedom. In this paper, the method has been extended to the case of thedamped forced vibration. It is known that analytic method is very complicated,troublesome and even not applicable, when the dynamical load P(t), as a func-tion of time t, is of irregular, or sometimes of discontinuous character. But thevectorial graphical method may be used with advantages....

In the reference [5], the author has suggested a method of vectorial graphicalcomputation of the undamped forced vibration of the system with one degreeof freedom. In this paper, the method has been extended to the case of thedamped forced vibration. It is known that analytic method is very complicated,troublesome and even not applicable, when the dynamical load P(t), as a func-tion of time t, is of irregular, or sometimes of discontinuous character. But thevectorial graphical method may be used with advantages. It is also possible to perform an approximate numerical computation follow-ing the same procedure of the vectorial graphical method. Based upon the principle of the vectorial graphical method, author has de-rived an expression of the general solution for calculating the damped forcedvibration of the system with one degree of freedom. To find the dynamical dis-placement function Y(t), it is believed simpler and more convenient to use thegeneral formulas given in this paper than to use the current analytical methods. Illustrations are shown not only for the concrete procedure of the vectorialgraphical computation, but also for the application of the general solution givenhere.

在参考文献[5]中,作者曾提出单自由度系统无阻尼强迫振动的矢量图解计算方法,本文将这方法进一步推广,应用到单自由度系统阻尼强迫振动。如所周知,当作用扰力随时间变化的图形为任意不规则甚且是断续的情况时,解析方法十分繁琐、累赘、甚至不再适用;这时,矢量图解计算方法并不受到限制并显示出它的优越性。 按照矢量图解计算的程序,进行近似的数值解算,也是可行的。 参照矢量图解计算方法的原理,本文导演出单自由度系统阻尼强迫振动一般性解答的一种表示式。当作用扰力函数以多项式形式给定时,用本文给出的表示式求解动力偏移函数,比较用现有一般解析方法要简捷一些。 本文对于矢量图解计算的具体程序列举了算例;对于本文给出的一般性解答的应用,也列举了算例。

~~

钝体头部与后体相接时,往往要出现角点,如果头部的钝度足够大,则在轴对称绕流情况下,音速点即在此角点处。目前求解此种音速点在角点处的钝体头部绕流的直接问题,只有积分关系式法才较精确,但该法须对沿激波层积分得的近似常微分方程组进行数值解,而且所给的二点边界条件中的一点,须按另一点的边界件条用逐步逼近法确定得,整个求解过程很繁琐且费时,而且在角点隣域进行数值积分时困难很大,见文献[7,8]。 鉴于此种情况,本文提出一种简易而又能具有数值解法精确度的实用计算方法,它系以积分关系式法的一级近似常微分方程组为基础,将头部激波用多项式来逼近,利用通过激波的气体貭量守恒关系式,激波的几何关系式以及物面驻点与音速点处的己知条件,直接确定得这种有角点钝体在高超音速轴对称绕流情况下,头部脱体激波的位置,形状以及头部上的压力、速度与速度梯度的分布。在求解过程中全部采用简单的数学分析与代数运算方法,方便且省时。 本文方法适用于任意形状的头部。文中对平头钝体进行了详细计算,从该算例中可见按本文方法所计算得的激波位置系位于一,二级近似的数值解之间,而所得的压力分布则要较一、二级近似的数值解为佳而更接近于实验值。

This paper presents a numerical method to solve plane elasticity problems.By considering the prototype as a lattice plate, approximate relations between the displacements of nodal points and the average strains of lattice lines may be established, and thereby approximate forms for the fundamental equations of elasticity obtained. So as to make the method applicable, the various parameters of reactions, stresses and displacements are provided. Finally, a relaxation technique for the force-distribution method...

This paper presents a numerical method to solve plane elasticity problems.By considering the prototype as a lattice plate, approximate relations between the displacements of nodal points and the average strains of lattice lines may be established, and thereby approximate forms for the fundamental equations of elasticity obtained. So as to make the method applicable, the various parameters of reactions, stresses and displacements are provided. Finally, a relaxation technique for the force-distribution method is proposed and an illustrated numerable example is given.

本文提出了一种弹性理论的近似数值解法。把一个平面弹性体当作网格板,可以近似地推求网格結点变位和网格线平均应变之間的关系。因而可以近似地来表达弹性理论的基本方程。为此,文中給出了反作用力系数、应力系数和位移系数;提出了一个松弛解法——力分配法,并附有算例。

 
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