论文部分内容阅读
基于柔性多体系统动力学理论建立了控制棒驱动机构(CRDM)三维实体有限元离散的刚-柔耦合动力学模型,用于计算CRDM在步跃冲击载荷下的响应。模型的方程采用模态缩减方法降低变形坐标维数,可以比非线性有限元方法更为高效地计算CRDM的运动曲线、冲击载荷和应力响应。此外,模型采用三维实体有限单元离散比杆单元离散方法具有更高的计算精度,不仅能准确地计算出大范围运动结果,而且可用于分析CRDM各部件的应力分布,找出局部应力偏大的部位。
Based on the theory of flexible multibody system dynamics, a discrete rigid-flexible coupled dynamic model of the control rod drive mechanism (CRDM) is established to calculate the response of CRDM under step-impact load. The equation of the model reduces the deformation coordinate dimension by the modal reduction method, and can calculate the motion curve, impact load and stress response of CRDM more efficiently than the nonlinear finite element method. In addition, the model uses three-dimensional solid finite element discrete rod element discretization method with higher accuracy, not only can accurately calculate the results of a wide range of motion, but also can be used to analyze the CRDM components of the stress distribution, find the local stress is too large Site.