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提高计算效率     
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  improve calculation efficiency
     Based on Newmark step-by-step implicit integration method, an improved method is put forward to improve calculation efficiency, and some questions are pointed out to which attention should be paid when initial static stress field is dealt with in dynamic nonlinear analysis.
     在Newmark隐式积分方法的基础上,提出了提高计算效率的改进方法,并指出非线性动力分析中,处理初始静应力场应注意的问题。
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     To different networks, we adopt different inference algorithms to quicken the rate of reasoning and improve calculation efficiency.
     针对不同的网络,可以采用不同的推理算法,以加快推理速度,提高计算效率
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     A stage of roll forming process was also simulated and the result shows that using solid shell element can improve calculation efficiency with no loss in accuracy.
     结果显示,采用实体壳单元可以有效缩小计算规模,提高计算效率.
短句来源
     Post density of the state vector is evaluated by shape similaritybetween the contour model and edge points, and distance transformation is introducedto improve calculation efficiency.
     使用轮廓模型与边缘点的相似性测度来评价状态向量的后验概率,并通过距离变换提高计算效率
短句来源
     By analyzing and comparing the results of the field seismic data processed with both of shallow refraction static correction and database refraction static correction, it shows that the database static correction can increase the precision of datum plan static correction, especially that of long wave static correction, and improve calculation efficiency and reduce cost.
     利用实际资料进行了浅层折射静校正与数据库静校正的对比分析,研究表明,数据库静校正能提高基准面静校正精度,尤其能提高长波长静校正精度,提高计算效率并节约施工成本。
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  improve computation efficiency
     The parallel computation can greatly accelerate computation speed, decrease computation time and improve computation efficiency.
     并行计算可以提高计算速度,缩短计算时间,提高计算效率
短句来源
     It has also described how to use properties of the general Sturm sequence in this method to improve computation efficiency and to prevent loss of eigenroots.
     文中还叙述了如何利用Sturm序列在本文方法中的性质,来提高计算效率和防止漏根的措施。
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     A physical model for plane wave synthesizing can be used to obviously improve computation efficiency.
     采用平面波合成的物理模型,可显著提高计算效率
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     To improve computation efficiency, we replace the traditional Jacob method by this Power Algorithm, which reduces largely calculating time without losing accuracy.
     为了提高计算效率 ,应用乘幂法代替传统使用的雅可比法等方法 ,大大缩短了计算时间 ,而且不影响计算结果的精确性。
短句来源
     The snapshots computed by different difference methods show that the method study in the paper work more favorable in decreasing grid dispersion and improving computation precision compared with two-order and staggered-grid four-order difference methods. Therefore the longer spatial step length can be utilized to improve computation efficiency.
     波场快照数值模拟结果表明,本文研究的数值模拟方法与波动方程二阶有限差分方法、交错网格四阶有限差分方法相比,在压制网格数值频散方面有明显的优势,计算精度提高,而且可以利用较大的空间步长,提高计算效率.
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  increase calculation efficiency
     Through establishing the mathematic model of railway special fuel distribution with certain universality, the essay discusses the operation mode and economic benefit of current distribution model of railway fuel, and puts forward a simplified algorithm used to increase calculation efficiency and optimize the railway fuel distribution and storage.
     通过建立具有一定普遍性的铁路路用燃油配送数学模型,探讨目前铁路燃油配送的运行模式和经济效益,并提出一个简化的求解方法,从而提高计算效率,优化铁路路用燃油的配送与储存。
短句来源
     Then it studies the parallel processing strategy in order to increase calculation efficiency, including pre stack data cut, imaging body blocking, data space rearrangement, internal memory controlling, input/output efficiency optimization and using the locality of migrated operator to solve the problem of cross node load equillibrium.
     二是为提高计算效率进行的并行处理机制研究 ,包括叠前数据分割、成像体分块、数据空间重排、内存控制、输入 输出效率的优化及利用偏移算子的局部性解决跨节点负载平衡问题。
短句来源
     For this purpose,the software of the slope stability calculation and controlling engineering design is programmed making use of the Activex Function of Autocad and Excel combined with the programming function of Visual Basic. This software has friendly interface,strong practicability,and can input and output the data quickly,so it can save time and increase calculation efficiency.
     为此,利用VB编程功能,结合A u toCAD、Exce l的A ctiveX功能,编制了滑坡稳定性计算与治理工程设计软件,该软件界面友好,实用性强,操作简便,可以快速输入和输出数据,能大量节省滑坡稳定性计算与治理工程设计的时间,提高计算效率
短句来源
  improve calculating efficiency
     1. Based on the concept of macro model and gauss integral, macro nonlinear model for GFRGW is provided which is compose of four vertical-bar element and one shear element. To improve calculating efficiency and accuracy, inboard bar elements are placed on the Gauss-Legendre integral point.
     1.基于宏观模型概念,为提高计算效率和精度,结合数学高斯积分知识,提出了用于灌芯纤维石膏墙板非线性分析的宏观墙元模型,即由四个竖向杆单元及一个剪切杆单元组成的单元模型,模型内侧的竖向杆布置在Gauss-Legendre积分点处。
短句来源
     It is proved by calculated example :It is rational that calculated time step adopts 2~10(°), because it not only ensures the accuracy of the solution, but also improve calculating efficiency;
     算例表明 :计算时间步长选择 2~ 10 (°)较为合理 ,能够在保证计算精度的同时 ,提高计算效率 ;
短句来源
     Under ensuring accuracy, to improve calculating efficiency and adaptability, the calculation method of first-arrival traveltime of finite-difference is derived based on any rectangular grid and a local plane wavefront approximation.
     在保证精度的条件下 ,为提高计算效率和适应性 ,本文推导了基于任意矩形网格和局部平面波前近似的有限差分初至波走时计算方法 .
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  improve calculation efficiency
An improved algorithm and a knowledge-based decision model developed to calculate effective tool contact are also discussed to help reduce calculation time and improve calculation efficiency.
      
A residual resampling selection step and a Metropolis-Hastings smoothing step are used to improve calculation efficiency.
      
  improve calculating efficiency
Under ensuring accuracy, to improve calculating efficiency and adaptability, the calculation method of first-arrival traveltime of finite-difference is derived based on any rectangular grid and a local plane wavefront approximation.
      
  其他


When the elastic-plastic finite element analysis of structures is implemented by using tangential stiffness method it is necessary for each increment of load to solve a set of simultaneous linear equations, which exist varied coefficient matrix in local region, Using conventional procedure will usually make considerable computational cost. In accordance with the special characteristics of the variation in coefficient matrix being local, a new algorithm based on Gauss elimination, the positive-negative sequence...

When the elastic-plastic finite element analysis of structures is implemented by using tangential stiffness method it is necessary for each increment of load to solve a set of simultaneous linear equations, which exist varied coefficient matrix in local region, Using conventional procedure will usually make considerable computational cost. In accordance with the special characteristics of the variation in coefficient matrix being local, a new algorithm based on Gauss elimination, the positive-negative sequence modification method is proposed. In general cases, the suggested method usually avoids the reformation and factorization of coefficients in elastic region of the stiffness matrix completely, so as to raise the computational efficiency. The characteristics of the new method have been studied and are compared with the available substructure method and rank 1 matrix modification method which have also utilized the local characteristic of variation. In addition, the rationality and validity have been judged. According to the positive-negative sequence modification method, the list of FORTRAN subroutine PNSMM is given in appendix.

利用切线刚度法进行结构弹塑性有限元分析,对于每一载荷增量,需要求解一系数矩阵局部有所变化的线性代数方程组。如果按一般步骤求解,将造成很高的计算费用。针对系数矩阵变化局部性特点,本文提出一种基于高斯消去法的新算法:顺序——逆序修正法。一般情况下,它可以完全避兔结构弹性区域刚度矩阵系数的重新形成和分解,从而达到提高计算效率,降低计算费用的目的。 文中分析和比较了新算法和现行的也是利用变化局部性的子结构法以及秩1矩阵修正法的特点,论证了新算法的合理性和有效性。 在附录中给出了根据顺序一道序修正法编制的FORTRAN子程序(PNSMM)。

A new improved algorithm of simultaneous iteration is presented for evaluation of generalized eigenproblems in dynamic analysis of large structures.The convergence of this algorithm is proved by the concepts of EK subspace and eigendirection and some details of how to perform this algorithm in computer are discussed.Based on statistics of computational quantity required for each step of iteration and a great number of practical computations, it is shown that in convergence rate the present method is comparable...

A new improved algorithm of simultaneous iteration is presented for evaluation of generalized eigenproblems in dynamic analysis of large structures.The convergence of this algorithm is proved by the concepts of EK subspace and eigendirection and some details of how to perform this algorithm in computer are discussed.Based on statistics of computational quantity required for each step of iteration and a great number of practical computations, it is shown that in convergence rate the present method is comparable to some simultaneous or subspace iteration algorithms available up to now, but it can cut down the computer run time for each step of iteration and raise the computation efficiency.

本文提出了同时迭代法的一种变型算法,用来求解大型结构动力分析中的广义特征值问题。使用了E_k子空间和特征方向的概念,证明了该算法的收敛率,并讨论了如何在计算机上实现的某些细节问题。通过统计每步迭代所需运算量和大量的实际计算,表明该算法与当前几种常用的同时迭代法或子空间迭代法相比,收敛率相同,但减少了每步迭代所需的计算量,提高了计算效率。

Most of the prevalent modal synthesis methods are referred to as "single-level synthesis". Their application to dynamic analysis of large complex structures may be confined by computer capacity. Two" improved substructural assembling techniques, called"multi-level synthesis"and "successive synthesis , are presented in order to raise computation efficiency and to be available for calculation of large structures on a computer with small interior capacity. In principle, the multi-level synthesis method is extension...

Most of the prevalent modal synthesis methods are referred to as "single-level synthesis". Their application to dynamic analysis of large complex structures may be confined by computer capacity. Two" improved substructural assembling techniques, called"multi-level synthesis"and "successive synthesis , are presented in order to raise computation efficiency and to be available for calculation of large structures on a computer with small interior capacity. In principle, the multi-level synthesis method is extension of the single-level one, but the successive synthesis only involves two substructures in each step of synthesis, one of which is synthesized in its generalized form of motion equation, and another in its physical form. In present paper the "rigid substructure technique" is also employed.A typical example has been calculated with satisfactory results. Numerical calculations show that the accuracies of the two improved assembling methods are trustworthy provided the frequency criterion proposed in this paper is adopted.

当今国内外流行的模态综合法都属于“单级综合法”。它对大型复杂结构动力分析的应用仍将受到计算机容量的较大限制。本文在子结构装配方面提出的“多级综合法”与“逐步综合法”可以克服这一障碍,并能提高计算效率。另外,本文采用的“刚性子结构技术”能使模态综合法保持其功能与特点,具有重要的实用价值。文中算例表明,只要采用本文频率判据,两种改进装配法的精度是可靠的。

 
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