Study On The Effectiveness Of Air Blast Damage Of Individual Rocket Warhead

Compared with bombing at the ground,the killing radius of rocket multiplied when air blast,which can kill people and targets hidden in trenches or behind bunkers more effectively.In this paper,a visual model of the distribution of the effective fragmentation on the ground target is obtained by combining numerical calculation with semi-analytical method.According to the requirements of the lethal power index,the influence of the individual rocket's attitude(falling velocity,falling angle and burst height)on the killing power of the warhead is analyzed.Firstly,the principle of air-blast of individual rocket,the principle of action of fixed distance air-blast fuze and the general situation of firing of individual rocket are introduced briefly.MATLAB software are used to simulate the external trajectory of individual rocket with different firing angle and initial velocity.According to the external trajectory curve obtained by simulation,the influence of the errors of rocket firing angle,initial velocity and setting time of fuze on the burst height is analyzed.The reasonable burst height range of individual rocket is determined with the limit of dense killing radius.Under the double restriction of the reasonable burst height range of rocket and the examination range of 800~1000 metres to the trajectory curve,the research range of the air burst attitude of individual rocket is determined.Secondly,the finite element model of warhead is established,and the numerical simulation of warhead initiation at different speeds is carried out by using ANSYS/LS-DYNA software.The parameters such as initial velocity and scattering direction of fragment are obtained,and the influence of falling velocity on fragment scattering law is analyzed.Taking one of the schemes as an example,through the study of fragment coverage area in a circular area on the ground,the change law of warhead killing power with the height and falling angle of the rocket is qualitatively analyzed,and the target is covered by fragment in the circular area without considering the relative position relationship between the target and the rocket explosion point in the ballistic horizontal direction.Finally,the corresponding fragment landing coordinate calculation model is established.According to the fragment initial velocity and scattering direction obtained by numerical simulation,the effective fragment landing coordinate is calculated through the fragment velocity attenuation formula in flight process and the 78 joules killing criterion of personnel.The distribution of the effective fragment landing coordinate on the ground surface target under the conditions of different bursting height,falling angle and bursting point error of the rocket is quantitatively analyzed.Finally,the effective bursting height range of the rocket satisfying the requirement of the killing power index is between 6 and 8metres.The comparison test results show that the two data are in good agreement.The results can be used as a reference for setting the setting time of individual rocket fuze.