| In order to provide a reference for design of the low-spin discoid submunition and its fuze, theoretical calculation, simulation analysis and experimental verification were applied. The distribution of the initial velocity of warhead fragments, different factors (different locations of booster, different thickness of shell, different shape of fragment) of lethality of the eccentric detonation propagation system and the dynamic characteristics.of separation of discoid submunition were analyzed.The influence of the bias of booster on lethality of fragments was obtained by the initial velocity theory of fragments and simulation analysis of ANSYS/LS-DYNA. The results indicated that the initial velocity of fragment increases as the increase of the distance between fragment and booster. As the same time, the growth rate of initial velocity range from slow to fast and then slow. Compared to the center detonating propagation system, while the eccentric distance is 7 mm, the enhancement of the initial velocity of fragment of the eccentric detonation propagation system can reach-5.06%～5.64%. Therefore the bias of booster not only improved the security of the fuze, but also has little effect on the lethality of fragments.The factors of lethality of the eccentric detonation propagation system were analyzed by simulation analysis. The results indicated that the influence of the bias of booster on lethality of feagments is not big, when the eccentric distance is 9 mm, the enhancement of the initial velocity of fragment can only reach-7.28%～8.28%. The initial velocity difference between fragment increases as the increase of location of booster. For a thick shell, the initial velocity of fragment decreases as the increase of thickness of shell, expecting while the shell is very thin. With a same arrangement of fragments, the initial velocity of spherical fragment is the highest, and then the cylindrical one, the cube one is the lowest.The flight stability of lethality of the discoid submunition was analyzed by theoretical analysis and simulation study. The results indicated that the tangential force coefficient, normal force coefficient and static moment coefficient increases as the increase of the ratio of length to diameter of discoid submunition. The submunitions fly as a string after cabin opening and cannot be stable, after the separation, the single submunition also cannot be stable. Therefore the low-spin discoid submunition can separate quickly after dispersion. |
