The ringunit characteristic equations in relation to Laplace 's, Poissou 's and Helmholtz 's equa. tions are derived.
本文推导出了该单元的拉普拉斯方程、泊松方程和波动方程的单元特征式。
3
In the numerical analysis of axially symmetry electromagnetic field, the finite element method using ringunit with rectangular cross-section has more advantages than other methods.