摘要
针对小行星表面微重力环境及样品机械属性未知的特点,提出了一种基于刷扫和研磨的复合式取样器设计方案。该取样器通过刷扫和研磨的复合方式进行取样,能够提高小行星表面取样任务的成功率。为了研究该取样器刷扫取样时刷轮叶片数、刷轮转速、推进速度、星壤参数等对取样效率的影响,研磨和刷扫复合取样的优越性以及刷扫和研磨时的驱动力矩,开展了样品颗粒相互作用建模及研磨取样动力学分析。基于离散元仿真软件EDEM,构建了取样器3D模型并仿真其在小行星表面取样,获得了样品收集质量与取样时间的关系曲线,分析了各个参数对取样效率的影响。结果表明:刷轮叶片数越多,刷轮转速越大,推进速度越大,取样器取样效率更高,刷扫和研磨的复合取样方法比起单一的刷扫取样,具有更高的取样效率。该研究为设计小行星取样器、取样参数设定和取样效果分析提供了依据。
In view of the unknown microgravity environment of the asteroid surface and the unknown mechanical properties of the sample,a design scheme for the composite sampler based on brushing and grinding is proposed.The sampler takes samples with a composite approach of brushing and grinding,and can improve the success rate of asteroid sampling mission.In order to study the effects of the blade number of the brush wheel,the rotational speed of the brush wheel,the feeding speed of the sampler,the soil parameters,etc.on the sampling efficiency of the sampler when brushing sampling,the composite sampling advantages of grinding and brushing,and the driving torques during brushing and grinding,the interactions of the sample particles are modeled,and the dynamics of grinding sampling is analyzed.Based on the discrete element simulation software EDEM,a three-dimensional(3D)model for the sampler is built and simulated to sample on the asteroid surface.The relationship curves of the sample collection masses and the sampling time are obtained,and the effects of the parameters on the sampling efficiency are analyzed.The results show that the larger the blade number of the brush wheel,the higher the rotation speed of the brush wheel,and the higher the feeding speed,the higher the sampling efficiency of the sampler.The composite sampling method of brushing and grinding has a higher sampling efficiency than the single brushing sampling method.This study provides bases for designing asteroid samplers,setting sampling parameters,and analyzing sampling effects.
作者
董成成
张军
陆希
黄帆
倪江生
黄繁章
江朝军
DONG Chengcheng;ZHANG Jun;LU Xi;HUANG Fan;NI Jiangsheng;HUANG Fanzhang;JIANG Chaojun(School of Instrument Science and Engineering,Southeast University,Nanjing 210000,Jiangsu,China;Shanghai Institute of Satellite Engineering,Shanghai 201109,China)
出处
《上海航天（中英文）》
CSCD
2020年第1期125-134,共10页
Aerospace Shanghai（Chinese&English）
基金
国家自然科学基金资助项目(61873066)
上海航天科技创新基金资助项目(SAST2017045)
江苏省自然科学基金资助项目(BK20181270)
关键词
小行星取样
刷扫取样
研磨取样
复合式取样
EDEM仿真
取样效率
asteroid sampling
brushing sampling
grinding sampling
composite sampling
EDEM simulation
sampling efficiency
