用矩阵法求解振动问题时,系统刚度矩阵的计算是首要的步骤之一,刚度矩阵的多种计算方法中,直接从刚度矩阵元k_(ij)的定义计算刚度矩阵,是最常用的方法。对于离散系统或离散化的系统,这个方法不会有什么问题,但是应用此法于刚体平面运动时,会出现不顺当的情况,且会出现错的计算结果。 When solving the vibration problem by the matrix method, the calculation of the system stiffness matrix is ​​one of the most important steps. Among the various calculation methods of the stiffness matrix, it is the most commonly used method to calculate the stiffness matrix directly from the definition of the stiffness matrix element k_ (ij). This method does not have any problems for discrete or discretized systems, but when applying this method to rigid body planes, there is an unpleasant situation, and wrong calculations can occur.