CAJ | 학술논문

首先通过人为设定数值断裂,从数值上分析数值断裂对计算精度的影响.然后引进一种可适用于大变形的并保证系统质量守恒、动量守恒和能量基本守恒的简单加点技术,用以阻止数值断裂.并用改进的smoothed particle hydrodynamics(SPH)方法对钢弹撞击飞机蒙皮进行数值模拟以验证其阻止数值断裂的有效性.在130~250 m/s的碰撞速度下,用改进的SPH方法得到的变形区直径、剩余速度以及弹坑深度与试验结果吻合较好.
수선통과인위설정수치단렬,종수치상분석수치단렬대계산정도적영향.연후인진일충가괄용우대변형적병보증계통질량수항、동량수항화능량기본수항적간단가점기술,용이조지수치단렬.병용개진적smoothed particle hydrodynamics(SPH)방법대강탄당격비궤몽피진행수치모의이험증기조지수치단렬적유효성.재130~250 m/s적팽당속도하,용개진적SPH방법득도적변형구직경、잉여속도이급탄갱심도여시험결과문합교호.
Effect of numerical fractures on the computational accuracy is analyzed by introducing artificial numerical fractures. A simple adding-particle technique, which can be easily applied in large deformations, is introduced to prevent numerical fractures. During the adding-particle process, the mass conservation and momentum conservation of the system are kept except that the energy has a little change. The experiments of steel projectile impacting on the airplane skin are simulated by the initial and improved SPH methods. The results show that numerical fractures can lead to very large computational errors. Compared with the initial SPH method, the improved SPH method can prevent numerical fractures effectively. The deformation diameter, the deformation depth and the residual velocity of the projectile obtained by the improved SPH method agree well with the experimental results.