基于磁梯度模型的水下弹丸运动参数测试与解算方法

Test and Calculating Method for Motion Parameters of Underwater Projectile Based on Magnetic Gradient Model

为适应恶劣水质环境下对弹丸外弹道参数测量需要,根据磁偶极子理论提出了基于磁梯度靶的水下弹丸弹道参数测试方法,推导获得了弹丸磁梯度非线性方程组.根据磁梯度数学模型中的几何变换参数优化问题,结合粒子群优化算法及牛顿法的各自优势设计了一种粒子群-牛顿混合解算算法,通过仿真射击试验对弹道测量误差的关键影响因素进行了讨论.结果表明,测试靶面上应布置4个磁梯度测试点,为提高测量精度,尽量减小磁梯度检测装置的基线距离,而着靶位置对测量误差的影响较小.

In order to adapt to the need of testing the external trajectory parameter for the projectile in the severe underwater environment,the magnetic gradient test target was proposed by using the theory of magnetic dipole.and the non-linear equations of magnetic gradient for underwater bullet were formulated.According to the problem of geometric parameter transformation of the magnetic gradient mathematical model,a new mixed algorithm was designed by utilizing the PSO and Newton optimizing method.At last,the key influence factor for trajectory measurement error was discussed by emulating the fire test.The results show that four magnetic gradient monitoring points should be set up on the test target.It is beneficial to increase the test accuracy by decreasing the length of the magnetic sensor baseline.The location of projectile on the test target has less effect on the accuracy of the test.