旋转弹气动力建模与飞行轨迹仿真

运用一种自回归滑动平均(ARMA)的时域气动力建模方法,以计算流体力学与刚体动力学(CFD/RBD)耦合仿真的输出结果为样本,对旋转弹的非定常气动力进行建模。利用建立的气动力模型与刚体动力学方程求解模块耦合,实现了旋转弹轨迹的快速仿真,并讨论了不同的建模方式对仿真精度的影响。算例结果表明:采用气动力模型与刚体动力学方程耦合仿真技术可以在不同初始发射条件下进行旋转弹飞行姿态与运动轨迹预测,且与CFD/RBD仿真结果吻合较好,证明ARMA气动力建模方法可以在保证旋转弹轨迹预测精度的同时大幅缩短仿真时间,节省计算资源。

Aerodynamic modeling and flight trajectory simulation ofspinning projectile

A time-domain autoregressive moving average (ARMA) method for aerodynamic modeling is adopted in the spinning projectile six-degree of freedom trajectory simulation.The computational fluid dynamics coupled with rigid body dynamics equations (CFD/RBD) simulation result is regarded as sample,and the unsteady aerodynamic model of the spinning projectile is established successfully.Different forms of the unsteady aerodynamic model combined with RBD equations are discussed considering the influence on the simulation effect.As is shown in the result,appropriate modeling form combined with RBD module can simulate the motion and attitude of the spinning projectile,and the simulation results from the new approach can fit well with CFD/RBD results under different initial conditions.This new simulation approach can be applied to the fast simulation research,which can not only guarantee the precision,but also save much time and computing resources compared with CFD/RBD simulation method.