| There are potential safety hazards in the efficiency oriented warhead automatic production line,because the lines are compact and dense,and there are high explosive equivalent per unit space.Factories had to use the safety oriented decentralized layout of production lines,which raise the production costs greatly.So the development of warhead production industry and the competitiveness of the international market have been restricted.Aiming at this problem,the antisympathetic detonation device of warhead automatic production line is studied in this paper.It has important theoretical significance and engineering value for the automatic production of warhead.On the basis of ensuring safety production,and taking production efficiency as the purpose,the antisympathetic detonation device of warhead automatic production line is studied by the numerical simulation method.Based on the mechanism of warhead martyrdom and detonation theory,this paper explores the impact of the different placements of warheads,different structures and different materials of devices on the protective effect.The main contents are as follows:（1）First,the power parameters of warhead near-field explosion,the propagation law of shock wave and the energy parameters of sympathetic detonation are analyzed.It is found that the shock wave and the fragments are the main reasons of warhead sympathetic detonation on the production lines.The major effect factors of the shock wave are the action time of over-and positive pressure,the roundabout flow,and the blast area of fired projectile.And the main influencing factors of the fragments are velocity and distribution.The follow research are carried out based on these conclusions.（2）The effects of warhead placement on shock wave action and fragment action are studied by numerical simulation.Including that the main warhead and passive warhead are placed parallel to the ground and face the same direction;The main and passive warheads are placed parallel to the ground,but in the opposite direction;The main and passive warheads are placed perpendicular to the ground;And one is perpendicular to the ground and one is parallel to the ground.The simulation results show that the shock wave overpressure borne by the passive warhead is less affected by the placement method.When the main warhead and the passive warhead are placed vertically,the positive pressure action time of shock wave and the reactivity of the passive warhead are the smallest;Detonation occurs when the reactivity of the passive warhead reaches 1 under the impact of fragments.The analytic hierarchy process is used to evaluate the antisympathetic detonation effectiveness of different placement methods based on the simulation results,comprehensively consider the protection effect,clamping cost,equipment land occupation and other factors.The calculation results show that the weight value of the main and passive warheads is the largest when they are placed vertically,about 35.67%.It shows that the placement method of the main and passive warheads perpendicular to the ground is more suitable for actual production.（3）The effects of protective barriers with arc section,rectangular section and triangular section on the flow around the shock wave are studied.By comparing the action time of overpressure and positive pressure of shock wave behind the barrier,it is concluded that the arc-shaped barrier has the best protection effect against shock wave,but the area is the largest;the protective effect of rectangular section barrier is slightly lower than that of arc barrier,but the area is the smallest.Considering the protection effect,floor area,processing cost and other factors,according to the simulation results,compare the barriers with different cross-section shapes,and calculate their antisympathetic detonation efficiency.The calculation results show that the weight value of rectangular barrier is the largest,about 50.5%,indicating that the rectangular section barrier has the best performance after considering the influence of various factors.The influence of the geometric parameters of the protective barrier on the flow around the shock wave is studied.The relationship between the length and height of the barrier and the explosion center distance is determined.It is considered that the height of the barrier is 1.25 times the explosion center distance and the length of the barrier is 2 times the explosion center distance.Because the barrier thickness is closely related to the material,the barrier thickness and barrier material are studied together.（4）Aluminum plate,steel plate,steel aluminum laminate and al-cfrp plate are selected.Using the method of numerical simulation,the minimum thickness of each material barrier under different scale distances is determined,and its nonlinear curve fitting is carried out,and the calculation formula of barrier thickness is obtained.The protective effects of barriers made of different materials are simulated,the simulation results show that steel plate and steel aluminum laminate have good attenuation effect on shock wave and fragment.After the aluminum ball with a speed of 3500 m / s and a diameter of 20 mm impacts the 5mm steel plate,the speed attenuation is 1435.9m/s,and after impacting the 5mm steel aluminum laminate,the speed attenuation is1745.6m/s.According to the simulation results,the weight value of barriers of different materials is calculated by using analytic hierarchy process,comprehensively considering the influence of material cost,protection effect,barrier weight and other factors.The calculation results show that the steel aluminum laminate accounts for the largest weight value,which is about 32.92%.Using steel aluminum laminate can achieve better results under the influence of the above factors.（5）According to the above analysis results and referring to the intelligent ammunition assembly line,build the overall structure of the antisympathetic detonation device and verify its protection effect.The warhead is placed vertically,and the barrier is made of steel aluminum laminate with rectangular section;the determination of warhead spacing is based on the minimum volume of barrier.When the barrier volume is the smallest,the warhead spacing is about 280mm;the antisympathetic detonation device adopts the way of guide rail transportation.Based on the overall structure of the antisympathetic detonation device,the deformation of the barrier and guide rails with different structures under the action of explosion is studied.The results show that except for the barrier directly subjected to explosion,the deformation of other barriers can be ignored;the sectional guide rail with the guide rail length of 0.5 times the length of the working platform has the minimum deformation range and the minimum replacement and maintenance cost.Compared with the layout of distributed warhead production line,the antisympathetic detonation device in this paper takes into account the production efficiency on the premise of ensuring safe production,and meets the requirements of safe and efficient automatic production of warhead.The research results of this paper have certain theoretical significance and engineering value for the construction and safe production of dense warhead automatic production line. |
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