Study On Theories And Technologies Of Asymmetrically Initiated Warhead

The achievement of aiming lethality of aimable warhead highly relies on the efficiency of the fuze-warhead cooperation and function of initiation system.This thesis focuses on the necessary key theories and technologies of asymmetrically initiated aimable warhead,such as initiation control,endgame design,fragment velocity under asymmetrical initiation,lethality efficiency evaluation of aimable warhead,etc.,and they are studied systematically and thoroughly using the methods of numerical modelling,theoretical deducing and arena test.The following results are mainly obtained:(1)Based on one-dimensional gas dynamics and the Gurney formula,new formulas for fragment velocity distributions of asymmetrically initiated warheads were established,and no experiment test is needed to determine unknown parameters.(2)Method for evaluating the effect of synchronous error of multi-point initiations on the warhead performance was proposed.Also deep insights of the influences of initiation styles and warhead structures,and the projecting angle changing caused by delay initiation were obtained.These findings can provide references for aimable warhead design.(3)Rigid logical explosive circuit was designed based on the new mixed asynchronous AND gate using redundant design and modular design method.Mild initiation circuit of linear multipoint initiations was designed and new evaluating method for the synchronism of the mild multipoint initiation circuit was proposed.The initiation system of aimable warhead was manufactured by composing the designed explosive circuit and the mild multi-point initiation circuit.(4)New measurement of the missile rotational speed was achieved by spiral arrangements of the laser range-finders,and algorithm of fuze-warhead cooperation for aimable warhead taking account of the target azimuthal angle and warhead rotation was built,which can be a good reference for other fuze mechanisms.(5)Cylindrical warhead and prismatic warhead were designed,manufactured and tested under multi-point asymmetrical initiations.The results of test and numerical modelling reveal that asymmetrical initiation can increase fragment velocity by 30.6% and increase penetrating density by 6.47% for the cylindrical warhead,and for the prismatic warhead,the velocity enhancement is27.71% and the penetrating density enhancement is 34.09%.The numerical modeling results show good coincidence with the experiments and can be used as a solid base for further research.(6)Code for analyzing and evaluating the lethality efficiency of aimable warhead was programed,and the damage probabilities to certain target of cylindrical warhead and prismatic warhead under different warhead-target distances were studied.