A criterion of zero magnetic fieldpoint, which is related with the symmetry of current-carrying system, is derived from a simple problem.
从一个简单问题出发，引出关于磁场零值点的一个判据，该判据与载流系统的几何对称性有关。
2
Based on the acoustic radiation mode analysis, the transfer matrix relating the pressure at every fieldpoint to normal component of surface velocity is formed.
基于声辐射模态分析，建立了外部场压和结构表面振动速度之间关系的传递矩阵。
3
When the direct boundary element method (DBEM) is used to solve an elastic problem and the fieldpoint coincides with the load point, the boundary integral will be strange.