The lumped mass matrix is a diagonal matrix.
集中质量阵是一个对用阵。
Consistent mass matrix and lumped mass matrixes are the common types of mass matrixes in structural dynamic analysis.
一致质量矩阵与集中质量矩阵是结构动力分析中常用的质量矩阵形式。
By the methods it is assumed that a structural system can be reduced to a lumped parameter system, of which the mass matrix is diagonal.
方法假定结构可以简化为集中参数系统，其质量矩阵是对角的。
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