基于微元法的偏心起爆战斗部破片初速计算方法OA北大核心CSTPCD

The distribution of initial fragment velocity in the aim direction is one of the important factors for evaluating the power of the directional warhead.Therefore,the calculation method of the initial fragment velocity in the whole domain on the direc-tional side of the warhead under the eccentric double-line initiation and the kinetic energy gain compared with the central initia-tion are studied.Based on the infinitesimal theory,the calculation method of the initial fragment velocity in different circumferen-tial position on the directional side was derived,and the static explosive experiment of the warhead was carried out to compare with the theoretical result.Combined with the numerical result of the warhead,the axial velocity correction function was fitted,and the universality of the algorithm was verified according to the existing research.It is shown that the proposed formula is suit-able for the warhead with eccentric double-line initiation,and the error between theoretical calculation and test results is within 4.80%,calculation result is consistent with actual situation.The fitting correction function can predict the initial velocity of the fragments in different axial direction.The algorithm still has good universality when the warhead parameters change and the cal-culation error is less than 7.11%.Compared with central initiation,the eccentric double-line initiation mode with an angle of 60° can increase the total kinetic energy of the fragments in the range of-30°-30° from the center of the directional side by 34.9%.