圆柱坐标 meaning in English
circular cylinder coordinates
circular cylindrical coordinates
circulary cylindrical coordinates
cylindrical coordinates
Examples
- Cylindrical coordinate manipulator
圆柱坐标操作器 - Governing equations of a modified k - model is derived in a three - dimensional cylindrical polar coordinate system , and an available equation is produced
首先给出单相螺旋流流场在三维圆柱坐标下的修正-湍流模型的控制方程，得出控制方程组的通用形式。 - Abstract : it is observed that the sommerfeld ' s formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system . it contains complex partial waves that are not physical . the standing wave representation of the same formula is shown to be covariant and physical . it is applied to solve the boundary value problem of fiber optics . the radiation modes as well as the guided normal modes are obtained in closed forms . the intensity distribution in various modes is obtained . it is remarked that the mode of critical refraction is missing
文摘:说明了球面行波的索末菲公式在坐标转动下不协变.证明了球面波的驻波表示是协变的，因而是一个物理的关系式，故适用于圆柱坐标中各类波动方程的定解问题.作为一个例，应用于光纤光学，导出了受导简正模和辐射模的表达式，以及各模式的强度分布 - A discretization equation is derived by using a finite volume method in three - dimensional cylindrical polar coordinate system . algebraic equations are solved by iteration with a line - by - line method that is a combination of tdma in axial and radial directions , ctdma in tangential direction and adi method in three directions . the pressure and velocity coupling are solved with the simple algorithm
在三维圆柱坐标下，利用有限体积法推导离散方程；在轴向与径向用三对角矩阵法( tdma ) ，在周向采用循环三对角矩阵法( ctdma ) ，采用交替方向亚松弛叠代法( adi )求解方程；推导同位网格下的压力修正方程，用simple算法处理速度与压力的耦合；为加速收敛，采用适当的松弛因子。 - The conformal microstrip antenna with some unique character has been applied in many fields , especialy on speedy objects . in this paper , an efficient fdtd algorithm is introduced to analyse the microstrip antenna . firstly , the fdtd formula in descartes coordinate system and in cylindrical coordinate system are obtained from the time _ dependent maxwell equations using the yee algorithm in a calculating region where the dielectric parameters are independent of time and space . the choice of the space discretization units and the time discretization interval are discussed which are decided by the accuracy and stability respectively . the shape and setup of the excitation source are discussed too . the excitation source is chosen to be gaussian pulse in shape . secondly , the mur ' s first - order and second - order boundary condition are deduced in cylindrical coordinate system . the methods of transforming radiation fields from near zone to far zone in the frequency domain and in the time domain are presented when fdtd is applied to analyse the characteristics of far zone . finally , three kinds of microstrip antennas are analysed . they are a slot antenna that lies on a plane ground of a microstrip , a slot antenna that lies on a cylindrical ground of a microstrip and a microstrip line _ fed aperture coupled stacked rectangular patch antenna in cylindrical coordinate system
本文从麦克斯韦旋度方程出发，建立了笛卡儿坐标下无源空间中均匀无耗媒质的fdtd基本方程和圆柱坐标下无源空间中均匀无耗媒质的fdtd基本方程，详细讨论了fdtd法计算中时间步长和空间步长的选取原则以及激励源的类型和设置；推导了mur一阶和二阶边界条件在圆柱坐标下的差分格式；给出了在用fdtd法计算天线的远场辐射特性时必需采用的频域和时域近场远场变换技术；最后用fdtd法计算了平面微带缝隙天线、柱面共形微带缝隙天线和柱面共形微带层叠天线的输入阻抗和远区辐射场，并分析了天线的一些参数的变化对天线输入阻抗的影响，得出了一些有用的结论。