用有限法分析工程问题，常归结为求解大型稀疏线性方程组，而波前法是一种非 常有效的方法。为使波宽最小，单元编号应遵循ａ．平面问题 须沿单元数较少的方 向顺序排列；ｂ．空间问题 须沿其中两维单元数乘积最小的方向顺序排列。相应波宽 的计算公式为 平面４结点 Ｗｄ＝２ｎ＋６；平面８结点 Ｗｄ＝４（ｎ＋３） 空间８结点 Ｗｄ＝［（ｍ十２）（ｎ＋１）＋２］·Ｎｆ 空间２０结点 Ｗｄ＝［（２ｎ＋１）（ｍ＋２）十（ｎ＋１）（ｍ十１）十η］·Ｎｆ The analysis of engineering problems by the finite method is often attributed to solving large sparse linear equations, and the wavefront method is a very effective method. In order to minimize the wave width, the element number should follow a. Plane problems must be arranged in the direction of fewer units; b. The space problem must be arranged in the direction in which the product of the two-dimensional units is the smallest. The corresponding wave width is calculated as a planar 4 node Wd=2n+6; a planar 8 node Wd=4(n+3) space 8 node Wd=[(m+x2)(n+1)+2]•Nf space 20 nodes Wd= [(2n+1)(m+2) ten(n+1)(m ten 1) ten η]·Nf