发射药床自然堆积模拟

Simulation on Packing Structure of Propellant Bed

为进行发射装药挤压破碎动力学研究,通过几何方法构建了初始构型下发射药床的动力学模型,采用牛顿欧拉方程描述发射药粒的运动过程,应用线性连接目录法建立每个药粒的邻居目录,建立发射药粒接触识别算法及三维块体接触模型,在邻居目录内应用射线交叉法进行块体间的接触检索,模拟了发射药床在重力作用下的自然堆积过程.获得了发射药床的密实堆积构型,为发射装药挤压破碎动力学研究奠定了基础.

To research the dynamics of compress and fracture of propellant charge,the dynamic model of initial packing structure of propellant bed was constructed by geometry method.The motion state of propellant grains was described by Newton-Eulerian equations.Neighbor list was established for each grain by Linked Linear List method.The collision detection method of propellant grains was proposed;the contact model for spatial polyhedra was established.The Ray Crossing Method was applied for the collision detection of polyhedra stored in the neighbor list.By these steps,the packing structure of propellant bed under gravity was simulated,and the close-grained structure of propellant bed was acquired.The result provides theoretical foundation for the research of compress and fracture dynamics of gun propellant charge.