摘要
开发了适用于小行星环境的大规模三维离散元程序DEMBody,针对低速射弹溅射表层风化层的小行星采样方案,仿真了相同质量不同形状的射弹在微重力环境下垂直射入颗粒床的过程,研究了溅射物质在采样器中的运动历程及最终收集质量与射弹形状的关系。结果表明,90°锥形射弹的采样效率最高。
Asteroid exploration will be the focus of competition between spacefaring powers in the next few decades,especially for the sampling-return mission.China is also planning to develop an asteroid exploration mission with surface sampling included.Within the Chinese space program,then,understating the impact dynamics related to granular regolith facilitate the development of efficient impact sampling mechanism designs for space missions.In this work,we use a three-dimensional N-body numerical code,DEMBody,to perform simulations of the low-speed impact sampling on granular regolith.Several different projectile shapes are used,i.e.,cones of various angles,hemispheres,spheres and disks.The results show that the projectile shape significantly influences the excavation stage and leads to various amounts of collected mass in sampler canister,regarding which the 90° conical projectile exhibits preferable performance for impact sampling scheme.
作者
程彬
宝音贺西
CHENG Bin;BAOYIN Hexi(School of Aerospace Engineering,Tsinghua University,Beijing 100084)
出处
《飞控与探测》
2019年第3期46-51,共6页
Flight Control & Detection
基金
国家杰出青年科学基金(11525208)
关键词
小行星采样
散体动力学
小行星探测
撞击坑
小行星风化层
asteroid sampling
granular dynamics
asteroid exploration
impact crater
asteroid regolith
