三维梁系结构刚体元-柔性连接元动力分析模型

将多体动力学与结构动力学结合，研究适用于空间梁结构的刚体元－柔性连接元模 型进行动力分析。推导出一般情形下柔性连接元的广义弹簧系数矩阵和刚体元的质量矩阵都 是非对角的。引入零长度刚性元模拟多个刚体元汇交于一点和相邻刚体元轴线不在一直线上 等情形。给出的特征值问题算例证明了这种模型的有效，可推广应用于非线性动力响应分析。

Discrete element with flexible connector method for dynamic analysis in the 3-D beam structure

Combining multibody dynamics and structure dynamics, a new discrete element with flexible connector method, which is available for dynamic analysis in the 3-D beam structure, has been developed in the paper. Both the general spring coefficient matrix of flexible connector and the mass matrix of discrete element are off-diagonal. The zero-length rigid element is introduced to simulate the node at which more elements are jointed together and to treat neighboring elements whose longitudinal axes are not in the same line. Given examples show that the eigenvalue analysis is successful and it can be extended to the nonlinear dynamic response analysis involved large displacement and rotation.