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method of characteristics     
相关语句
  特征线法
     Method of Characteristics (MOC) for vacuum plume simulation is introduced.
     介绍了特征线法(MOC法)对真空羽流场进行数值模拟的过程。
短句来源
     On the basis of the quasi-steady assumption, the traditional quasi-steady friction model in liquid transients is proposed and its numerical solution with the method of characteristics is obtained.
     采用“拟稳态”假设,推导拟稳态管壁切应力的计算公式,建立目前瞬变分析常用的传统拟稳态摩阻模型,并结合特征线法建立其数值计算模型;
短句来源
     Method of Characteristics for Calculation of Unsteady Flow in Open Channel With Linear Variable Trapezoidal Cross-section
     线性变截面梯形渠道非恒定流计算的特征线法
短句来源
     Method of characteristics for vacuum plume simulation
     模拟真空羽流场的特征线法
短句来源
     By using the method of characteristics the global existence of C 1 solution to the IBVP with the dissipative boundary and the non-characteristics is proved,and it is also proved that there is no vacuum state as t>0,if there is no vacuum state in the initial time.
     考虑在 L agrange坐标下一维非等熵流体力学方程组的具耗散边界和非特征边界的初边值问题 ,利用特征线法证明了其 C1 解整体存在性 . 同时证明了如果初始时刻不存在真空状态 ,那么当 t>0时永远不出现真空态 .
短句来源
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  特征线方法
     Mixed finite element method , characteristic method and discontinuous Galerkin methods are combined to one dimensional KdV equations. The characteristic mixed discontinuous finite element scheme and the modified method of characteristics with adjusted advection (MMOCAA) are given. Namely, the characteristic method in time and discontinuous finite element method in space are used.
     对一维KdV方程利用混合有限元方法,特征线方法和间断有限元方法相结合的技巧,给出方程的特征线混合间断有限元离散方案和修正的特征线混合间断有限元离散格式,即对时间导数离散采用特征线方法,空间变量离散采用间断有限元方法,证明了有限元解的存在唯一性,稳定性和误差估计。
短句来源
     NUMERICAL SIMULATION OF UNSTEADY DETONATION BY METHOD OF CHARACTERISTICS
     一维非定常炸轰的特征线方法数值模拟
短句来源
     The Method of Characteristics Applied to Calculate the Pulsating Flow in the Discharge Pipe of a Compressor and to Predict its Noise
     利用特征线方法计算压缩机排气管的脉动气流及预测噪声
短句来源
     In the present paper the method of characteristics is used for calculating one-dimensional problems in water shock tubes.
     本文用特征线方法计算了一维水激波管问题.
短句来源
     In this paper, we employ a mixed finite element method to approximate the pressure and the Darcy velocity, and a Galerkin finite element method combined with the MMOC (modified method of characteristics) to approximate the concentration.
     本文中,我们采用混和有限元方法同时逼近压力方程中的压力和Darcy速度,而采用标准的Galerkin方法结合特征线方法逼近浓度方程中的浓度。
短句来源
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  特征法
     Transient Simulation of Lossy Interconnections in the High Speed VLSI Using the Macromodel by the Modified Method of Characteristics
     用修正特征法模型求解高速VLSI中有耗互连线的瞬态响应
短句来源
     FULL WAVE ANALYSIS OF SIMULTANEOUS SWITCHING NOISE IN HIGH SPEED MCM BY THE METHOD OF CHARACTERISTICS
     高速多芯片组件同步开关噪声的二维特征法全波分析
短句来源
     Based on the network modeling and sensitivity analysis of transmission lines with the method of characteristics, an optimization design method in time domain is developed for the interconnections in nonlinear high-speed circuits.
     提出了一个基于特征法传输线网络建模和灵敏度分析的非线性高速互连线电路的时域优化设计方法 .
短句来源
     As the development of the computer science, a lot of methods have been used to solve the shallow water equations numerically. The most significant four methods of them are: Finite Difference Method (FDM), Method of Characteristics (MOC), Finite Element Method (FEM) and Finite Volume Method (FVM).
     浅水方程在计算机技术发展的推动下已发展了诸多有效的数值计算方法,如有限差分法(FDM)、特征法(MOC)、有限单元法(FEM)、有限体积法(FVM)等。
短句来源
     A novel numerical method for the time-domain electromagnetic problems, named method of characteristics, is presented and used to solve the above problem. The results obtained are in accordance with that by the method of FD-TD and that reported by literature.
     文中提出一种新的时域电磁问题的数值方法—特征法,并用于求解上述问题,所得结果与FD-TD计算的结果和文献报道一致.
短句来源
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  特征线解法
     This paper improves the implicit method of characteristics (IMOC) for solution of hyperbolic equations.
     本文将求解双曲型方程的隐式特征线解法(简称IMOC)作了改进。
短句来源
     The method of characteristics on one-dimensional wave equations of 1 inear viscoelastic materials is used in the curve match of high strain dynamic testing on pile.
     本文粘弹性一维波动方程特征线解法应用到高应变动测桩中的曲线拟合中,建立等时连续桩模型;
短句来源

 

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      method of characteristics
    The concentration equation is treated by an implicit finite difference method that applies a form of the method of characteristics to the transport terms.
          
    A class of biquadratic interpolation is introduced for the method of characteristics.
          
    The validity of the simplifications made is well confirmed by comparison with calculation, using the method of characteristics, and with experiment.
          
    The determination of the extremal nozzle contour for gas flow without foreign particles has been carried out in several studies [1-6], based on the calculation of the flow field using the method of characteristics.
          
    The method of integral relations [1] and the method of characteristics are used to construct a scheme for the numerical solution of the problem of the interaction of a supersonic underexpanded jet with an obstacle.
          
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    In previous investigations on the methods of computing the change of river bed due to sedimentation, the bed and water surface configurations were computed separately and the conventional back water equations were used. Since the bed changing process and the flow unsteadiness are two co-existing and mutually interfering phenomena, the assumptions necessarily introduced error. A method of computation was suggested in this paper, which takes care of the unsteady effects of the flow. For channels of constant width...

    In previous investigations on the methods of computing the change of river bed due to sedimentation, the bed and water surface configurations were computed separately and the conventional back water equations were used. Since the bed changing process and the flow unsteadiness are two co-existing and mutually interfering phenomena, the assumptions necessarily introduced error. A method of computation was suggested in this paper, which takes care of the unsteady effects of the flow. For channels of constant width and flow carrying essentially suspended load, equations of continuity[Eq.(3) to(5)] and one-dimensional equation of motion[Eq.(6)] were presented. After the elimination of c through the use of Velikanoff's equation of silt transportation, a system of 3 equations for 3 unknowns u, h, z were obtained[Eq.(9)]. 4 additional systems of equations[Eqs.(10),(11),(12),(13)] based on different assumptions were also given, making up 5 cases. It may be mentioned that only Eqs.(12) and(13) have been used in previous investigations. All 5 sets of differential equations can be solved by the method of characteristics, the characteristic equations being Eqs.(20),(21);(24),(25);(26),(27);(28),(29);(30),(31) respectively. The values λ=dx/dt are given by the intersections of the curves F_1, G_1; F_2, G_2; F_3, G_3; F_4, G_4; F_5, G_5, as shown in Fig. 2. It can be seen that due to the simplifying assumptions made, the 4th and the 5th sets of equations have only 2 and 1 group of characteristic curves respectively. The authors recommend the use of Eqs.(24) and(25) in actual computation. In Fig. 4 curves were drawn for rapid determination of the λ's. It can be seen that for values of the parameters Ku/pω and u~2/gh usually encountered in sedimentation problems the three roots are all real. Illustrative example was given. In Appendix Ⅰ, the transportation of sediments by surges was discussed, further clarifying the physical meaning of the λ's. Equations for channels of variable width were presented in Appendix Ⅱ, and a method of solution was suggested, thus paving the way to practical application.

    以往进行河床变化計算时,常对水流做一些近似的假定,再計算不恆定的泥沙冲淤运动.实际上河床变化必引起水流特性的改变,后者改变又引起冲淤变化,二者相互影响,在上游来水量变化很大时尤其如此.本文同时考虑了水流和河床变形的不恆定現象,推导了等寬渠道中一維的、以悬移貭为主的微分方程組.做了四种不同的簡化后可得五种情形.前三种为以往未采用过的方程組,可用三族特征縐求解.后二种为以往假設过的,分別保存两族和一族特征线.在討論了五种情形的近似性后建議采用第二种,并討論了計算方法.在附录Ⅰ中推导了間断传播速度,藉以說明特征綫的物理意义.附录Ⅱ中說明非等寬渠道的計算方法,以便实际应用.

    In the present paper the method of characteristics is used for calculating one-dimensional problems in water shock tubes. Numerical computations have been carried out for both the free boundary condition and the pressure-fixed (constant pressure) condition. In the free boundary problem, we have investigated the fracture and flying-off of the water. In the constant pressure boundary problem, we have examined the formation, development, and disappearance of the cavity of the water. Besides, the second accerelation...

    In the present paper the method of characteristics is used for calculating one-dimensional problems in water shock tubes. Numerical computations have been carried out for both the free boundary condition and the pressure-fixed (constant pressure) condition. In the free boundary problem, we have investigated the fracture and flying-off of the water. In the constant pressure boundary problem, we have examined the formation, development, and disappearance of the cavity of the water. Besides, the second accerelation phenomenon similar to that of a plate under exploding load has been studied.

    本文用特征线方法计算了一维水激波管问题.分别对自由端边界和定压端边界作了数值计算.在自由端边值问题中探讨了水的断裂飞散现象.在定压端边值问题中探讨了水中空化现象的形成、发展和消失,并研究了类似于平板受爆炸加载后的二次加速现象.

    Based upon basic aerothermodynamics equations for flow in turbomachinery setted up by Prof. Wu, computing supersonic flow past inlet of cascade section on an arbitrary stream filament of revolution was programmed with method of characteristics. The effeets of the variations of the distance between two neighbouring S1 surfaces and the radius were taken into account. In the program, the coefficients used in the calculation are the average values between the two connecting points, obtained after iteration....

    Based upon basic aerothermodynamics equations for flow in turbomachinery setted up by Prof. Wu, computing supersonic flow past inlet of cascade section on an arbitrary stream filament of revolution was programmed with method of characteristics. The effeets of the variations of the distance between two neighbouring S1 surfaces and the radius were taken into account. In the program, the coefficients used in the calculation are the average values between the two connecting points, obtained after iteration. This convergence rate is fast, and normally three or more cycles of iteration are sufficient for engineering requirement.For simplicity, the shape of the bow wave was taken from that given by W. Moeekel, since it had shown to be ture for supersonic flow of the Mach Number range encountered in the transonic compressor. The supersonic flow field was calculated using preceding equations, till next blade was reached. The values of Mach Number and angle of inlet flow for next blade were determined by interpolation which was made on the two-dimensional neighboring three points. Then, the calculation was extended along the circumferential direction several pitches, with preceding procedure, until the solution of one pitch length. respected itself. The uniform condition far upstream was determined by the use of the set of the equations of continuity, momentum and energy.The relation between variation of inlet flow angle and inlet Mach Number can be obtained. The value of inlet flow angle obtained is then the one corresponding to the unique-incidence for the incoming Mach Number. There were many logical comparision in the program, so that all procedure of calculation can be in progress automatically. The accuracy of the obtained results is high relatively.

    根据吴仲华提出的基本方程,采用特征线法,对任意迴转面叶栅超声速进口流场的计算编制了计算机程序.计算中特征线方程中的系数是采用特征线两端的平均值,因而需要进行迭代.为了提高计算精度,并提出了一种最近三点二元插值法.叶栅前缘脱体激波的形状和位置是采用Moeckel提出的近似方法确定的.为了满足叶栅流动周期性条件,在计算中对叶栅各个通道进行逐个计算,直到相邻通道中流动情况相同为止.根据守恒条件,确定了无限远来流状态.最后讨论了根据这些计算确定唯一进气角的方法,并给出了计算实例.

     
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