Study On The Motion Characteristic Of Terminal-Sensitive Submunition

In order to improve the conventional long-range artillery against armored targets, and with the purpose of damaging an armored goal for only one or two shells, the shells are required to be automatically detecting and searching the armored goal. The terminal-sensitive submunitions are satisfied such requirements. It is one kind of cluster ammunition that combined with advanced sensor technology and EFP technology, and it has high cost-effective in destroying armored targets. Nowadays, many countries in the world give priority to develop this kind of ammunition. However, the terminal-sensitive submunitions have a complex space movement and there are many factors, which will directly affect the damage probability. The intensive studies on these subjects would provide strong theoretical basis and technological support to improve the global property, the global design, and the design theory of terminal-sensitive submunition, and increase the damage probability.Theoretical analysis, numerical and experimental verification are combined to establish a dynamic model of the different movement stages of the terminal sensitive ammunitions, and the analysis of the characteristics of movement was respectively carried out in this paper. On all of these premises, the major factors which affect the final damageprobability were summarized. And here the major subjects in this paper were listed:Firstly, during the process of stable scanning, the parameters such as scan angle, fallvelocity, rotational speed were studied, and the conclusion of the transform law of these parameters were drew, as well as their interdependence. At the same time, in order to determine the initial parameters of the terminal-sensitive submunitions, a bullet separation program was proposed according to the separation laws.Secondly, the inflatable model of drogue parachute was established based on the finite element method. According to the flat circular parachute which was used in the decelerator, a three-dimensional model based on the Mass-Spring System was proposed. And taking into account in the canopy structure of the internal forces and internal air movement, the dynamic model of particle nodes during the inflaction process was set up. Then, the model was verified by the experimental results.Thirdly, the dynamics model of the drogue parachute and the submunitions during the speed deceleration and spin decreasing stage was established, as well as the Flexible Multi-Body Dynamics model during the stable scanning period. Respectively, the model analysis of the parachute during the steady state was made, on that basis, the basic equation of the free vibration of the parachute was set up, as well as the computing method of the intrinsic frequency.Fourthly, the experiments were conducted to verify the parameters during the stable scanning period. By combining the experiments through launching the hot-air balloon and artillery, the dates of the fall velocity, scan angle and the rotate speed of the submunition was got. Then, these dates were compared with the simulation dates, and the accuracy of this model was verified.Fifthly, the random model of the submunitions during the various periods was set up in this paper. That is, on the premise of the analysis of the target characteristics in the battlefield, the factors which influence the hit probability were studied, and by using the Monte Carlo method, the random model of the submunitions was constructed, and based on these studies abovementioned, the graphic simulation of the overall trajectory was finally completed.Sixthly, the method to improve the identification probability was advanced. Given that the submunitions adopt the technique of millimeter wave/infrared sensor, the Fuzzy Mathematics and D-S theory MSDF(multisensor data fusion) were combined to apply to the process of the target identification, thus improving the identification probaility.Finally, the direction for the continuing research of this subject was pointed out.