Abstract:

To achieve high-precision application of geomagnetic navigation in projectile guidance, a magnetic field calculation model for projectile is proposed. The tetrahedral element is used to discretize the projectile model, and the magnetic induction intensity of each discrete element at the measurement point is calculated by summing up the magnetic induction intensity around the projectile at any position. The calculation results of the spherical shell analytical model and the analysis systems (ANSYS) simulation experiments of the projectile model show that the relative errors of the magnetization field calculation model of the projectile are 0.42% and 0.55%, respectively. The field experiment results of the projectile scaling model show that the relative error between trends in the measured values and the calculated values of the measurement points is 1.09%. The magnetic field calculation model of the projectile is validated in three ways to accurately measure the magnetic induction intensity at any position around the projectile, indicating the effectiveness and feasibility of the calculation model, which has high engineering practical value.

Key words: geomagnetic navigation, magnetization field model, ANSYS simulation, numerical analysis of spherical shell, experiment on projectile scaling model