中文说明：产生色散曲线棒和管.Finds外场的耦合的传播模式％波导。所述激发源是在内部施加的应力和管（由函数PCEXTSTRESS指定）％外表面和％体积力在管的材料，其作用（在给定的功能％PCEXTVOLFOR）。在扫频耦合系数进行评估在不同的模式％的人认为，通过沿Z轴整合和％，则表面上或管的体积。
English Description：
Generates dispersion curves for rods & tubes .Finds the coupling of external fields to the propagating modes of the% waveguide. The excitation sources are stresses applied in the inner and% outer surfaces of the tube (specified by function PCEXTSTRESS) and% volumetric forces which act in the material of the tube (given in function% PCEXTVOLFOR). The coupling coefficients are evaluated in a frequency sweep% over the different modes considered, by integrating along the axis Z and% then the surface or the volume of the tube.