下三角形矩阵 [数] lower triangular matrix
- 本文给出了上(下)三角形矩阵的一个求逆公式。
This article gives a Formula for finding inverse matrices of upper (down) triangular matrix. - 采用三角形面积元,提出了一种计算任意形状的细长壳体水声辐射问题的有限元结合边界元解法,推导了三角形面积坐标下的质量矩阵。
A method of structural finite element and fluid boundary element is presented for predicting the vibration and sound radiation from submerged slender shell. - 给出了星形延边三角形接线平衡变压器在相坐标下的节点导纳矩阵,以便与电力系统其它部分接口进行有关分析。
Finally, its nodal admittance matrix in phase coordinates is derived, which can be used to interface with the other part of power systems in related analyses.