查询词典 structure equations

According to the above problem, this research firstly divides the petroleum development system into three subsystems according to the structure of oilfield output, and then sets up the state transfer equations of oilfield development system by embedding the function simulations and the transfer rule between the total output and the subentry outputs.

本文从整体优化的角度出发，将整个油气开发系统按其产量构成划分为若干个子系统，在研究总产量与其分项产量之间递变规律的基础上，结合功能模拟建立了油田产量开发系统的状态转移方程，并在此基础上利用目标规划建立了油田五年规划模型。

To overcome the difficulties and drawbacks in modeling the dynamic systems by using traditional methods, a hybrid evolutionary modeling algorithm is proposed to model the dynamic system with a system of ordinary differential equations whose main idea is to embed genetic algorithm in genetic programming where GP is employed to optimize the structure of a model, and GA is employed to optimize the parameters of a model.

针对采用传统方法解决动态系统的微分方程建模问题所遇到的困难和存在的不足，文中设计了将遗传程序设计与遗传算法相嵌套的混合演化建模算法，以遗传程序设计优化模型结构，以遗传算法优化模型参数，成功地实现了动态系统的常微分方程组建模过程自动化。

Boundary value problem; global structure; singular; system of ordinary differential equations; positive solution; measure chain

基础科学，数学，数学分析边值问题；全局结构；奇异；常微分方程组；正解；测度链

We introduce the Lax-Wendroff difference method into the calculation of interconnect transmission lines.An efficient Lax-Wendroff difference scheme with second order accuracy is proposed by considering the structure characteristic of telegrapher's equations.

1引言随着信号频率的增加和部件物理尺寸的减小，互连传输线对电路系统的影响越来越明显，该方面的研究在现代高速VLSI设计中具有十分重要的意义。

All assumptions for the method are come from the classical theory of the differential equations of motion of any studied element of a structure. Its dynamic stiffness matrix is the transcendental function of frequency. This transcendental eigenproblem can be solved efficiently by applying the well-known Williams-Wittrick algorithm.

该方法的所有假设仅来自于建立该单元运动微分方程的经典理论，所形成的动态刚度阵是固有频率的超越函数，解决这类超越特征值问题的有效方法是Williams-Wittrick算法。

For overcome nonlinear terms of any degree in the equation, we made a proper transformation according to the structure of the equation at first, make the equations into ordinary differential equation. Then solve the ordinary differential equation exactly, by auxiliary functions method and undetermined the coefficient method and algebraic computer system Mathematica.

为了克服方程中非线性项的任意次幂，我们采用的方法是首先根据方程的特点，做适当的变换，使原问题转化为常微分方程的问题，其次对该常微分方程再进行各类变换，如辅助函数法以及待定系数法……。

From the basic principles of the AC machine,using the equivalent analysis method, a series of the equations、vector diagram、equivalent circuits of BDFM were obtained, which is the foundation of the analysis and control of the BDFM wind power generation system. The variable structure control was first used to the active and reactive power decoupling control of the BDFM.

无刷双馈电机的功率绕组、控制绕组、转子绕组的极对数不同，电流的实际频率也各不相同，论文从交流电机的基本理论出发，采用等效的方法，得到了无刷双馈电机的基本方程式、向量图和等效电路。

Due to the moving base existence of the minehunting and the frame structure characteristic of the sonar array,a new modeling thought in which the boat body coordinates is regarded as moving coordinates and the whirligig equation of sonar array compared with the self coordinates is founded on the basis of the Eulers theorem and the coordinate transform is introduced. The dynamic equations of minehunting sonar array with the state matrix form are founded by settling the dynamic models with the vector form. So it offers theory foundation for analyzing the dynamic characteristic and designing robust control.

由于猎雷艇作为动基座的存在和声纳基阵的框架结构特点，提出了以艇体坐标系为运动坐标系，运用变形的欧拉定理和坐标变换建立声纳基阵相对自身坐标系的旋转运动方程的建模思想；将所建立的矢量形式的动力学模型展开整理，获得了状态矩阵形式的猎雷声纳基阵动力学方程，为系统动力学模型的实用化奠定了基础。

We give different kinds of iterative methods of some quaternion matrix equations,and using structure-preserving property for complexification operator of the quaternion matrices,which analysis and character the convergence of various algorithms.

给出了若干类四元数矩阵方程的多种迭代算法，并利用四元数矩阵复表示运算的性质与保结构特性，分析和刻画了各种算法的收敛性。

Firstly, the geometrical structure of the target is approximated by bilinear surface technology. Then, surface integral equations are formed. Finally, simulation calculation to representative dielectrically completely coated targets is conducted. Compared the high order MoM results with the results of literatures, good agreement is found between them.

建立目标的双线性表面几何模型，基于等效原理建立表面电磁积分方程，以典型的完全涂敷目标为例，采用高阶矩量法进行仿真计算。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。