Research On Underwater Jam And Its Fuze Optimization Based On Improved Effect Of Bullet Group

Underwater interference ammunition, which takes the form of cargo missile, is actually a continuous explosive noise jammer against sonar and torpedo. In order to provide a reference for the optimization of submunition including its fuze, finally increase the effects of submunitions, four different technologies were studied with the method of theoretical analysis, studying of experiment and computer simulation.In order to verify the shock resistance ability of the key structure of submunition, the peak pressure of shock wave of other submunition with a different distance from the detonation submunition were simulated using LS-DYNA software. The peak pressure of electrifying device was 9.05 MPa, at the distance of 0.8 m from the detonation submunition. The pressure to shear the locating pin was 12.62 MPa, thus, the electrifying device is able to resist the shock wave of detonation submunition, and it is correspond to the submunition experiment of resisting shock wave.In order to make sure that the fuze is assembled with interrupter, thus increasing the safety and reliability of submunition and effects of submunitions, each component was weighted with the quantity of nearly 100. The results showed that the mass of nearly half of the components follow normal distribution and half of them follow Weibull distribution. The mass range of fuze lacking interrupter, fuze assembled with interrupter were calculated with Monte-Carlo method and it is concluded that if the mass of fuze is bigger than 22.9894 g, then the interrupter must have already been assembled. The simulation result showed that the weighting method is feasible and would not waste components. Also, this method is more suitable for fuzes with a smaller mass.In order to use submunition distributon optimization to increase the probability of submunition working properly, then increase the effects of submunitions, data of a dispersal experiment was analyzed using statistical method. Data showed that mean value of distance of nonadjacent submunition was greater than that of adjacent one obviously, and the greater the difference of tier number was, the greater distance of two submunition was between two tiers. According to the conclusions above, better order arrangements of submunition in the same tier and among different tiers in the cargo missile is proposed. Arrangements of submunition in the same tier can increase the minimum detonation time interval of adjacent submunition from 0.5 s to 2.0 s. Arrangements among different tiers can make sure that if the tier number difference is less than or equal to 6, the sequence numbers of submunition weren’t be adjacent.In order to control sunmunition assembling orientations to decrease the radial centroid excursion of cargo missile, then to optimize the distribution of submunitions and increase the effects of submunitions, the ultimate centroid excursion of submunition with the effect of the dimensional variation of submunition was analyzed with Solidworks. On basis of that, the radial centroid distribution of cargo missile was calculated using Monte-Carlo method with submunitions followed different mass distribution and centroid distribution, which were assembled in the cargo missile in different orientations. Result showed that, the centroid excursion of submunition must be decreased when submunition was assembled in a certain orientation, while it needn’t to be specially controlled when assembled in a random orientation. Assembling in a random orientation is more beneficial to decreasing the radial centroid excursion of cargo missile than assembling in a certain orientation.