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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。
A time-domain aerodynamic modeling method based on autoregressive moving average (ARMA) was used to calculate the output of CFD / RBD coupled simulation. The unsteady aerodynamics of the projectile was built mold. The aerodynamic model is established and the rigid body dynamics equation is used to solve the module coupling. The fast trajectory trajectory simulation is realized, and the influence of different modeling methods on the simulation accuracy is discussed. The results of numerical examples show that the aerodynamic modeling and the dynamic simulation of rigid body can simulate the attitude and trajectory of the projectile under different initial launching conditions, which is in good agreement with the CFD / RBD simulation results. The modulo method can shorten the simulation time and save the computational resources while ensuring the prediction accuracy of the projectile trajectory.