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complex velocity
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  复速度
     The boundary conditions of this virtual flow may be established by the boundary conditions of the complex velocity on the physical plane, thereby the boundary value problem is solved. The formulae for calculating the lift, drag and the shape of each free streamline are obtained. In addition, certain limiting cases are discussed.
     该虚拟流动的边界条件可通过复速度在物理平面上的边界条件来建立,然后求解这一边值问题,得出了计算升力、阻力及自由流线形状的公式,并对几种极限情况进行了讨论。
短句来源
     In thin paper, ths traditional problems of Complex potential, complex Velocity, elevating force and force moment in the flow around rocket tail profile have been studied by usingthe theory of boundory value problem of analytic functions.
     用解析函数边值问题,解决火箭尾翼剖面绕流的复势,复速度,升为及力矩等问题.
短句来源
     Finally, we give as an example the calculation of complex velocity potential for a twisted duct with square cross-section.
     最后给出了一个方形扭曲管的复速度势计算实例。
短句来源
     In this paper, a method of calculating synthetic seismogram contained mulitiple and attenuation using complex velocity in the case of layered medium and normal incidence in the frequency domain has been presented.
     本文给出一种在频率域内利用复速度计算层状介质、垂直入射情形下包含多次反射和衰减的合成记录的方法。
短句来源
     The complex velocity w(z) is then expended into Laurent series and if the coefficients of the first three terms in series are determined, the hydrodynamie characteristics of a circular arc hydrofoil can be derived.
     然后把复速度w(z)展成罗郎级数,设法求出级数中前三项系数,要求的流体动力系数即可得出。
短句来源
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  复杂速度
     This kind of tomography inversion with a rectangular block cell, that could process the directive wave and refraction as well as transmission wave, can model and invert the complex velocity structure. It is unnecessary to cognize wave styles and it calculates velocity quickly.
     这种层析反演方法以块体为基本单元 ,可以处理直达波、折射波和透射波 ,模拟和反演复杂速度结构 ,不用识别波形 ,计算速度快。
短句来源
     The tomographic approach which basic unit is rectangular block can model and inverse the complex velocity structure.
     这种层析反演方法以块体为基本单元,可以模拟和反演复杂速度结构。
短句来源
     The application to Marmousi model shows that the adaptability, effectiveness and utilities of the method to the complex velocity model are qualified.
     通过对Marmousi模型的试算 ,验证了该方法对复杂速度模型的适应性、有效性和实用性。
短句来源
  “complex velocity”译为未确定词的双语例句
     A Consideration on Complex Velocity to Elevation Meter
     复合式速高比计研究
短句来源
     In this paper, both the exact solution of the complex velocity induced by a horizontal flat plate moving vertically near a plane wall and the pseud-steady approximate solution to the same problem for the plate still having horizontal velocity are obtained together, by using the theory of elliptical functions.
     本文利用椭圆函数将平板和地面围成的区域保角变换至矩形内部,然后在变换平面上求解,得到了有地面效应时水平平板铅垂运动所诱导的势流精确解,以及平板同时还有水平速度情况下的“准定常”连续绕流近似解。
短句来源
     Ray tracing techniques are widely applied in seismology, among which the shortest path method (SPM) is robust for 3-D ray tracing in complex velocity structures.
     射线追踪技术在地震学领域有着广泛的应用,其中以最短路径算法在复杂介质中走时计算稳定性最好。
短句来源
     This phenomenon is resulted from the complex velocity struc- ture of down-faulted strata and incorrect reflection migration from poststack time migration.
     造成这些现象的原因是断陷地层的速度结构复杂,常规叠后时间偏移不能使反射波正确归位,需要使用三维叠前深度偏移技术才能实现复杂目标区的高精度成像。
短句来源
     Accurate velocity field is the key to find and delineate drilling target in Dongling area due to complex velocity distribution.
     东岭地区地震速度场变化复杂,建立合理的速度场是发现和落实钻探目标的关键。
短句来源
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  complex velocity
- The only way to make an excessively complex velocity model suitable for application of ray-based methods, such as the Gaussian beam or Gaussian packet methods, is to smooth it.
      
The accuracy of hypocenter locations based on regional data is affected by the complex velocity structures characteristic of subduction zones, but the problems are now well-understood.
      
This paper reviews applications of the finite-difference and finite-element methods to the study of seismic wave scattering in both simple and complex velocity models.
      
Jeffreys-Bullen P and PKP travel-time residuals observed at more than 50 seismic stations distributed along Italy and surrounding areas in the time interval 1962-1979, indicate the complex velocity pattern of this region.
      
Turbulent swirling water flow in a pipe has complex velocity distributions with special measurement problems tor experimental work.
      
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The pressure distribution of noncavitating potcnial flow around gate piers shown in Fig. la has been analysed. The analysis has its practical significance in that the minimum-pressure coefficient is closely related to the incipient cavitation number. After the W plane was mapped on to, the t plane with known transformations except an unknown parameter m, the complex velocity was expressed by Eq. (10) in terms of an unknown function Ω (t). Eqs. (13) and (16) indicate that along the boundary f and g are...

The pressure distribution of noncavitating potcnial flow around gate piers shown in Fig. la has been analysed. The analysis has its practical significance in that the minimum-pressure coefficient is closely related to the incipient cavitation number. After the W plane was mapped on to, the t plane with known transformations except an unknown parameter m, the complex velocity was expressed by Eq. (10) in terms of an unknown function Ω (t). Eqs. (13) and (16) indicate that along the boundary f and g are respectively related, to the magnitude of the boundary velocity and the boundary geometry. Three equations to solve for the three unknowns are furnished by the conditions along the boundary: (1) The angle τ is given as a function of z. (2) f and g, being the real and imaginary parts of an analytic function, are related to each other. (3) The points of tangency are transformed to points on the real axis of the t plane. For the case in which the nose curve is composed of circular arcs, Eqs. (22), (28) and (29) were derived. The functions f and g were found numerically by iteration, and m was computed from Eq. (28). The distribution of velocity and that of pressure along the line of symmetry and the boundary were computed and plotted in Fig. 5, in which the pressure distribution from wind tunnel tests was also included. Preliminary results on incipient cavitation number were plotted in Fig. 6, to be compared with the theoretical |C_(pm)| curve. More tests are being done to study the scale effects.

本文分析了具有平行边墙的、头部由圆弧组成的二元半无限闸墩的绕流问题.根据沿边墙的流速和压力分布可以求出最小压力系数,再进一步估计初生空穴数.最后用气流试验的压力分布资料和水流试验的初生空穴数资料和分析结果进行了比较.

The method of functions of complex variable is used in solving the problem of small amplitude surface waves on water generated by a vibrating side wall, the general formula for the complex velocity is given, and three different types of wall vibrations are discussed in some detail.Two different methods were used for the measurements and recording of surface waves. The experimental results in the case of small amplitude agree well with theory. Some observation and recording were made with large amplitudes....

The method of functions of complex variable is used in solving the problem of small amplitude surface waves on water generated by a vibrating side wall, the general formula for the complex velocity is given, and three different types of wall vibrations are discussed in some detail.Two different methods were used for the measurements and recording of surface waves. The experimental results in the case of small amplitude agree well with theory. Some observation and recording were made with large amplitudes. Second subharmonic vibrations were observed in the surface waves when the driving frequency is above a certain critical value. This phenomenon is yet to be accounted for theoretically.

侧壁振动所产生的小振幅表面波的理论问题是一个求解具有混合边界条件的Laplace方程的问题.我们在引入一新的变量后,将它化为一Dirichlet问题,及使用复变函数方法求解,得到计算表面波复速势的普遍式.使用它得到了侧壁的三种典型振动的复速度、自由面的鉛直位移,无限远的波幅及辐射功率等.在实验中,装置了两种测量表面波的设备,证明了小振幅波的理论结果并观测了大振幅表面波的一些现象.发现在壁的恒定振幅下,侧壁振动频率有一临界值,超过它表面波的频率成为侧壁振动频率的一半,我们称这种波为半频波.关于半频波还需要可靠的理论解释.

In this paper, formulas to calculate the lift, drag and moment coefficients of a supereavitating circular arc hydrofoil with zero thickness are derived by using the linearized theory developed by Geurst. Similar to the method used in aerodynamics, we integrate the Cauehy type integral in Geurst solution by means of contour integral, the velocity field of a circular arc hydrofoil can be represented analytically. The complex velocity w(z) is then expended into Laurent series and if the coefficients of the...

In this paper, formulas to calculate the lift, drag and moment coefficients of a supereavitating circular arc hydrofoil with zero thickness are derived by using the linearized theory developed by Geurst. Similar to the method used in aerodynamics, we integrate the Cauehy type integral in Geurst solution by means of contour integral, the velocity field of a circular arc hydrofoil can be represented analytically. The complex velocity w(z) is then expended into Laurent series and if the coefficients of the first three terms in series are determined, the hydrodynamie characteristics of a circular arc hydrofoil can be derived. The object of this paper is to investigate the camber effect of a supercavitating hydrofoil upon its performance characteristics, hence the results obtained are useful in analysing the performance of the blade section of a supercavitating propeller or the hydrofoils of a high speed hydrofoil craft. The numerical calculations show that when the cavitation number and the angle of attack are sufficiently small the results may be used as the first approximations.

本文对有拱度而无厚度的圆弧型水翼按J.A.葛尔斯脱(Geurst)线性理论导出其升力、阻力和力矩系数公式,以便看出超空泡水翼的拱度效应。与空气动力学中所用的方法相似,首先用围道积分求出葛尔斯脱解中的柯西型积分,这样圆弧水翼的速度场可以确定。然后把复速度w(z)展成罗郎级数,设法求出级数中前三项系数,要求的流体动力系数即可得出。本文的结果可用分析和估算超空泡螺旋桨叶切面和高速水翼艇水翼的流体动力性能。最后数值计算的结果表明,当攻角和空泡数充分小时,本文结果可作为一级近似。

 
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