In this paper, by defining new state vectors and developing new transfer matrices of various elements mov- ing in space, the discrete time transfer matrix method of multi-rigid-flexible-body system is expanded to stud...In this paper, by defining new state vectors and developing new transfer matrices of various elements mov- ing in space, the discrete time transfer matrix method of multi-rigid-flexible-body system is expanded to study the dynamics of multibody system with flexible beams moving in space. Formulations and numerical example of a rigid- flexible-body three pendulums system moving in space are given to validate the method. Using the new method to study the dynamics of multi-rigid-flexible-body system mov- ing in space, the global dynamics equations of system are not needed, the orders of involved matrices of the system are very low and the computational speed is high, irrespec- tive of the size of the system. The new method is simple, straightforward, practical, and provides a powerful tool for multi-rigid-flexible-body system dynamics.展开更多
沉管隧道横向地震响应分析是沉管隧道结构抗震设计的重点.根据沉管隧道的结构特点和接头剪力键的节点构造,建立了沉管隧道的多刚体-剪切铰-黏性阻尼铰多体动力学模型,并应用多体动力学中的离散时间传递矩阵法(multibody system discrete...沉管隧道横向地震响应分析是沉管隧道结构抗震设计的重点.根据沉管隧道的结构特点和接头剪力键的节点构造,建立了沉管隧道的多刚体-剪切铰-黏性阻尼铰多体动力学模型,并应用多体动力学中的离散时间传递矩阵法(multibody system discrete time transfer matriX method,MS—DT-TMM)建立了数学模型及表达式,同时编写Matlab程序进行求解实现.设定算例分别采用MS—DT—TMM和传统有限元法(finite element method,FEM)对沉管隧道横向地震响应进行对比分析,两者吻合较好,表明MS—DT-TMM应用于沉管隧道横向动力响应分析的可行性和有效性.展开更多
开展了含有柔性关节的轮式移动机械臂的动力学特性研究。基于多体系统离散时间传递矩阵法(discrete time transfer matrix method of multibody system, MS-DT-TMM)建立了车轮、车体、柔性关节和机械臂的动力学方程,进而得到平面轮式移...开展了含有柔性关节的轮式移动机械臂的动力学特性研究。基于多体系统离散时间传递矩阵法(discrete time transfer matrix method of multibody system, MS-DT-TMM)建立了车轮、车体、柔性关节和机械臂的动力学方程,进而得到平面轮式移动柔性机械臂的整体动力学模型。在不平路面的激励下,分析机器人系统的动力学特性,并讨论柔性关节对系统的影响。数值仿真结果验证了基于MS-DT-TMM模型的可行性和有效性,与刚性结果对比分析表明,由柔性关节引起机械臂的弹性振动,直接影响机器人末端的操作精度,说明考虑关节中柔性因素的必要性。展开更多
基金supported by the Natural Science Foundation of China Government (10902051)the Natural Science Foundation of Jiangsu Province (BK2008046)the German Science Foundation
文摘In this paper, by defining new state vectors and developing new transfer matrices of various elements mov- ing in space, the discrete time transfer matrix method of multi-rigid-flexible-body system is expanded to study the dynamics of multibody system with flexible beams moving in space. Formulations and numerical example of a rigid- flexible-body three pendulums system moving in space are given to validate the method. Using the new method to study the dynamics of multi-rigid-flexible-body system mov- ing in space, the global dynamics equations of system are not needed, the orders of involved matrices of the system are very low and the computational speed is high, irrespec- tive of the size of the system. The new method is simple, straightforward, practical, and provides a powerful tool for multi-rigid-flexible-body system dynamics.
文摘沉管隧道横向地震响应分析是沉管隧道结构抗震设计的重点.根据沉管隧道的结构特点和接头剪力键的节点构造,建立了沉管隧道的多刚体-剪切铰-黏性阻尼铰多体动力学模型,并应用多体动力学中的离散时间传递矩阵法(multibody system discrete time transfer matriX method,MS—DT-TMM)建立了数学模型及表达式,同时编写Matlab程序进行求解实现.设定算例分别采用MS—DT—TMM和传统有限元法(finite element method,FEM)对沉管隧道横向地震响应进行对比分析,两者吻合较好,表明MS—DT-TMM应用于沉管隧道横向动力响应分析的可行性和有效性.
文摘开展了含有柔性关节的轮式移动机械臂的动力学特性研究。基于多体系统离散时间传递矩阵法(discrete time transfer matrix method of multibody system, MS-DT-TMM)建立了车轮、车体、柔性关节和机械臂的动力学方程,进而得到平面轮式移动柔性机械臂的整体动力学模型。在不平路面的激励下,分析机器人系统的动力学特性,并讨论柔性关节对系统的影响。数值仿真结果验证了基于MS-DT-TMM模型的可行性和有效性,与刚性结果对比分析表明,由柔性关节引起机械臂的弹性振动,直接影响机器人末端的操作精度,说明考虑关节中柔性因素的必要性。
