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如果我们取特征矩阵的任意不相同的两列,比如第一列和第二列,第二列和第三列,其中之一转置之后,乘以质量矩阵或者刚度矩阵,再乘以剩下的那一列,那么结果都是 0。
只有当我们取同样的列的时候,比如第一列的转置,乘以质量矩阵,再乘以第一列,这时候结果才不为 0这也就是正交的概念,所谓的 orthogonality。把特征矩阵的转置,乘以质量矩阵或者刚度矩 阵,再乘以特征矩阵,我们就能得到 principal 质量矩阵或者刚度矩阵。
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owner: bian222 - (no access) - 地震力是怎么算出来的111.pdf, p58


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