Simulative experiments on the ground were carried out to measure the radiation by chemical explosion of aerospace explosives in stage separation and evaluate the impaction on the electronics in the rocket. Electromagnetic pulses by different explosives were captured by a rod antenna and measured by a real time analyzer. The results show that radiation increases as the energy of the explosion. When using a mild linear shaped charge,considerable pulses were recorded in dozens of milliseconds after the separation, with the frequencies around megahertz and magnitude about several V/m on single frequency. Electromagnetic environment inside and outside the rocket were recorded and compared by simple dipoles, and current pulses induced on the circuits inside the rocket were also measured. The conclusion could direct the anti-interference design on the inner electronics of launch vehicle.

Simulative experiments on the ground were carried out to measure the radiation by chemical explosion of aerospace explosives in stage separation and evaluate the impaction on the electronics in the rocket. Electromagnetic pulses by different explosives were captured by a rod antenna and measured by a real time analyzer. The results show that radiation increases as the energy of the explosion. When using a mild linear shaped charge,considerable pulses were recorded in dozens of milliseconds after the separation, with the frequencies around megahertz and magnitude about several V/m on single frequency. Electromagnetic environment inside and outside the rocket were recorded and compared by simple dipoles, and current pulses induced on the circuits inside the rocket were also measured. The conclusion could direct the anti-interference design on the inner electronics of launch vehicle.

The explosive shock wave pressure is an important parameter which is used for the evaluation of explosion effect, and the characteristic of shock wave pressure is closely related to charge and detonation mode. A measurement method and the results of overpressure of charge with shell measured in the case of thermal explosion were described, and the results were analyzed according to the structure of explosive cave. The results show that the electromagnetic radiation is emitted due to the electrokinetic effect and the friction between explosion product and shell when the charge explodes, and the signal duration and complexity of electromagnetic radiation generated by the charge with shell are different from those generated by the bare charge.

The explosive shock wave pressure is an important parameter which is used for the evaluation of explosion effect, and the characteristic of shock wave pressure is closely related to charge and detonation mode. A measurement method and the results of overpressure of charge with shell measured in the case of thermal explosion were described, and the results were analyzed according to the structure of explosive cave. The results show that the electromagnetic radiation is emitted due to the electrokinetic effect and the friction between explosion product and shell when the charge explodes, and the signal duration and complexity of electromagnetic radiation generated by the charge with shell are different from those generated by the bare charge.

Numerical simulations of explosion and impact problems have important engineering application value in the fields of national defense and civil security. Numerical simulations for these problems have a lot of di culties because the explosion and impact problems are strongly nonlinear transient dynamic problems in which multi-material mechanical behaviors are involved under the condition of high strain rate, high temperature and high pressure. Therefore, in this paper , the pseudo arc-length method for 3D nonlinear hyperbolic conservation system is proposed and the process of the algorithm realization is analyzed. The numerical results show that the algorithm improves the resolution of the shock wave strong discontinuity e ectively. The additive Runge-Kutta method for gaseous detonation numerical simulation is developed. In this method, the nonlinear convection part is solved implicitly while the chemical reaction source part is handled explicitly. The results show that the additive Runge-Kutta method can well capture and accurately describe the complex structure and typical characteristics. The parallel Eulerian numerical method of 3D multi-material hydrodynamics is investigated for the requirement of large-scale computation in engineering practical physical problems. The 3D explosion and impact problem parallel computation hydrocode is developed and the test method for this parallel hydrocode is proposed. According to the above works, some problems of large-scale and high-precision calculations for explosion and impact problems are solved. Finally, the experimental and numerical investigations on heavy-caliber shaped-charge penetration in thick concrete target are carried out, and the e ectiveness of the proposed numerical method is demonstrated by typical explosion and impact engineering problems.

Numerical simulations of explosion and impact problems have important engineering application value in the fields of national defense and civil security. Numerical simulations for these problems have a lot of di culties because the explosion and impact problems are strongly nonlinear transient dynamic problems in which multi-material mechanical behaviors are involved under the condition of high strain rate, high temperature and high pressure. Therefore, in this paper , the pseudo arc-length method for 3D nonlinear hyperbolic conservation system is proposed and the process of the algorithm realization is analyzed. The numerical results show that the algorithm improves the resolution of the shock wave strong discontinuity e ectively. The additive Runge-Kutta method for gaseous detonation numerical simulation is developed. In this method, the nonlinear convection part is solved implicitly while the chemical reaction source part is handled explicitly. The results show that the additive Runge-Kutta method can well capture and accurately describe the complex structure and typical characteristics. The parallel Eulerian numerical method of 3D multi-material hydrodynamics is investigated for the requirement of large-scale computation in engineering practical physical problems. The 3D explosion and impact problem parallel computation hydrocode is developed and the test method for this parallel hydrocode is proposed. According to the above works, some problems of large-scale and high-precision calculations for explosion and impact problems are solved. Finally, the experimental and numerical investigations on heavy-caliber shaped-charge penetration in thick concrete target are carried out, and the e ectiveness of the proposed numerical method is demonstrated by typical explosion and impact engineering problems.

The basic principle and the parallel design strategy of the PMMIC-3D parallel program which using Euler method based on the message passing interface (MPI) mode were stated. After numerically stimulating the fortification mode, it can be seen that the results of numerical stimulation basically match with the reality and the physical laws. The shock waves of explosive detonation in fortifications not only had a higher peak overpressure, but also had a longer duration of action. When the shock wave met the wall, it would reflect and produce the reflected high pressure. Because of the diffraction convergence, the local high pressure would be brought about in a certain region behind the wall, in which the destructive effect was much larger compared with the shock waves of air explosion. The propagation process and the interaction of shock waves can be seen clearly by the numerical stimulation, which can determine the arrival time of the shock waves at various positions. The optimal explosive charge can be ensured by comparing the overpressure value of shock waves at different places.

The basic principle and the parallel design strategy of the PMMIC-3D parallel program which using Euler method based on the message passing interface (MPI) mode were stated. After numerically stimulating the fortification mode, it can be seen that the results of numerical stimulation basically match with the reality and the physical laws. The shock waves of explosive detonation in fortifications not only had a higher peak overpressure, but also had a longer duration of action. When the shock wave met the wall, it would reflect and produce the reflected high pressure. Because of the diffraction convergence, the local high pressure would be brought about in a certain region behind the wall, in which the destructive effect was much larger compared with the shock waves of air explosion. The propagation process and the interaction of shock waves can be seen clearly by the numerical stimulation, which can determine the arrival time of the shock waves at various positions. The optimal explosive charge can be ensured by comparing the overpressure value of shock waves at different places.