Analysis of the Impact of Explosion Depth on Momentum Acquisition of Asteroids
- Paper ID
95562
- author
- company
Shanghai Institute of Satellite Engineering; Shanghai Key Laboratory of Deep Space Exploration Technology; Shanghai Insitute of Satellite Engineering; Shanghai Academy of Spaceflight Technology (SAST), China Aerospace and Technology Corporation (CASC)
- country
China
- year
2025
- abstract
Asteroid deflection technology is an effective means to counteract asteroid collisions with Earth. This paper proposes a blasting deflection technology based on buried explosives. By placing explosives below the surface of an asteroid and controlling the detonation time, the surface soil is ejected to obtain a reverse velocity increment, thus achieving the deflection of the asteroid. Based on the Smoothed Particle Hydrodynamics (SPH) method, a multi-level model of asteroid targets and explosive blasting simulation is constructed to analyze the deflection momentum that can be generated by asteroid targets at different explosion depths. The results show that, a) the relationship between the explosion depth and the momentum obtained by the asteroid is non-linear, with an overall trend of first increasing and then decreasing, and there is an extreme point; b) during the blasting process, with the impact of the shock wave, the surface soil closest to the explosive appears to peel off and be ejected; c) the velocity increment of the asteroid is mainly derived from the velocity increment of the soil on the surface being ejected normally; d) with the increase of the burial depth, the maximum ejection range angle of the surface ejecta contracts; and e) after the burial depth increases to a certain extent, no more ejecta are produced, and the explosion only has an internal impact, without changing the momentum of the asteroid.