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时间域
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  time domain
    THE METHOD FOR TRANSFORMING THE MATHMATIGAL MODEL OF THE INDUSTRIAL PROCESSES FROM DISGRETE TIME DOMAIN INTO GONTINUAL TIME DOMAIN
    工业过程的数学模型由离散时间域向连续时间域的转换方法
短句来源
    THE FINITE ELEMENT METHODS IN TIME DOMAIN
    时间域有限元法
短句来源
    The Model of Time Domain and Frequency Domain in the Linear Control System
    线性控制系统的时间域与频率域模型
短句来源
    The original nonlinear differential equations of motion -with general nonstationary excitation in the time domain are transformed into equivalent ones with modutated Gaussian excitation in the space domain by use of an nonlinear transformation.
    将系统的运动微分方程通过非线性交换从时间域转化到空间域,由此得到一个以空间距离坐标为自变量的变参数非线性方程,时间域内的一般非平稳高斯激励则变换为空间域内容易处理的调幅高斯激励。
短句来源
    A DISCRETE METHOD FOR TIME DOMAIN PROBLEM OF RESERVOIR AND HYDROPOWER STRUCTURE
    关于水库和水能结构时间域问题的一个离散化方法
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  “时间域”译为未确定词的双语例句
    If the HG(z) obtained by identification on or out line are in the forms of and the forms of G(S) are and In this paper some formulas are presented to determine the parameters as K, τ_d, τ, τ_0, τ_1, τ_2, ζ and T.
    若由辨识所获得的HG(z)为和则与之对应的连续时间域上的数学模型为和文中所提出的各个公式可用来计算K、τ_d、τ、τ_1、τ_2、τ_0、ζ和T.
短句来源
    In the present paper, we first by Laplace transform present a derivation of principle of transformed virtual work, three principles of minimum transformed energy with influence of rotatory enertia for dynamics of anisotropic linear elastic plates with three generalized displacements.
    本文首先通过Laplace变换导出了关于具有三个广义位移并考虑转动惯量效应时各向异性的线弹性板在动力学中的转换虚功原理和三个最小转换能量原理及其在原空间时间域中用原函数表示的对应形式,然后通过引进相容权函数的集合推导出关于空间时间域的三个最小值原理。
短句来源
    Variable sampling interval control chart with sampling at fixed times in continuous process
    固定时间域可变采样间隔的统计控制图
短句来源
    Encouraged by the success of the extended Kantorovich method for space-domain problems, the present study makes a substantial extension of this method to the time-dependent problems.
    延拓Kantorovich法在空间域问题上的一系列成功,提示我们把这种方法延伸到求解时间域问题。
短句来源
    Result can have not sense in finite element method.
    对于复杂地表情形的地球模型,用时间域边界元法进行数值模拟也是方便有效的,而且地表对模拟结果的影响,可以得到反映。
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  time domain
Our proofs proceed in the time domain and allow us to represent each solution regardless of the spectral radius of P(0):=2-s∑cα, which has been a difficulty in previous investigations of this nature.
      
A Time Domain Characterization of the Fine Local Regularity of Functions
      
In this paper, the global and local linear independence of any compactly supported distributions by using time domain spaces, and of refinable vectors by invariant linear spaces are investigated.
      
For the finite-difference time domain (FDTD) method, the electromagnetic scattering problem, which requires the characteristic structure size to be much smaller than the wavelength of the exciting source, is still a challenge.
      
The discrete spectrum of the field after continuation is obtained from difference methods for Maxwell's curl equations in frequency-domain, and the time domain solution of the original problem is derived from their inverse Fourier transform.
      
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Reference [1] has demonstrated the basic time-domain technique of synthesizing optimal flight control system.This paper continues to introduce frequency-domain approach on the topic from the engineering viewpoint.At first,it briefly states the theoretical bases of frequency-domain technique-Parseval's theorem and optimization theorem,then classical root-square locus method and the advanced contributions to frequency-domain technique are discussed.This paper emphasizes the frequency-domain methods of selecting...

Reference [1] has demonstrated the basic time-domain technique of synthesizing optimal flight control system.This paper continues to introduce frequency-domain approach on the topic from the engineering viewpoint.At first,it briefly states the theoretical bases of frequency-domain technique-Parseval's theorem and optimization theorem,then classical root-square locus method and the advanced contributions to frequency-domain technique are discussed.This paper emphasizes the frequency-domain methods of selecting performance index's weight factor matrices and its application in the synthesis of optimal flight control problems.The processing feature of frequency-domain approach is that it first derives the Laplace transform of optimal control function,then constitutes the desired minimum order controller.

文献[1]已经介绍了综合最佳飞行控制系统的基本时间域方法,本文继从工程观点介绍这个课题的频率域方法,描述对象仍是线性二次型最佳问题。首先简述频域法的理论基础:Parseval定理和最佳化定理。然后分别介绍古典根方轨迹法以及频域法的各项现代成果。文中强调了选择品质指标加权矩阵的频率域方法和在综合最佳飞行控制问题中的应用。频域法的特点是先解出最佳控制时间函数的拉氏变换式,然后构造所希望的最小阶控制器。

In this paper the Galerkin weighted functon method is abopted, for the finitc element analysis of the transient thermal fields using the 2 to 4-node time elements with variabe time steps. The flow chart of the computer program and the numerical results of some typical examples are given. To end this paper the transient thermal and stress field of a turbine rotor subjected unloading during discharging are solved by using the presented method

本文提出采用加列金加权余量法对时间域作变步长2—4点有限元划分的计算方法,并应用于求解热传导问题中的暂态温度场问题,文中给出了此算法的程序框图以及典型实例的计算结果。最后,本文对大型汽轮发电机组参加调峰时,处于甩负苘阶段的汽机转子的暂态温度场,应力场用本文所给算法做了计算。

A simple and useful finite element method for solving thermal conduction problem with ablation is presented.At first,finite element equation with derivatives is formulated from conservation law,then various forms of schemes are obtained using Ga-lerkin form to discreze.The finite element equation is formulated with moving coordinate system in order to solve a typical problem.The computed results are compared with analytical and difference solutions.

本文介绍一种适合于烧蚀传热特点的简便和实用的有限元法。首先从能量守恒原理出发,建立带有导数的有限元素方程,然后介绍了采用伽辽金(Galerkin)法对时间域进行有限元离散而得到的各种格式。 为了解决烧蚀移动边界问题,采用了在动坐标系上建立有限元素方程。 用本方法对典型问题进行了计算,并与理论解、差分解进行了比较,对方法作了初步讨论。本方法应用实例是高速飞行器轴对称端头再入烧蚀体的传热计算。

 
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