工程设计学报
工程設計學報
공정설계학보
JOURNAL OF ENGINEERING DESIGN
2013年
6期
476-481
,共6页
模拟月壤%钻取%离散元%钻机与月壤相互作用
模擬月壤%鑽取%離散元%鑽機與月壤相互作用
모의월양%찬취%리산원%찬궤여월양상호작용
simulant lunar soil%lunar drilling%DEM%interaction between lunar soil and drilling rig
月壤为离散介质,其力学行为不仅受外部因素影响,而且受月壤颗粒形状之间相互作用和约束因素影响,一般连续介质力学难以模拟其力学特性,而离散元法作为一种分析离散介质的数值方法,可用来模拟器具与月壤相互作用的力学行为。基于前苏联L una-24月面钻取采样过程力学机理分析,首先对钻取运动过程进行分析,然后应用PFC3D离散元软件,构建离散元月壤模型,通过赋予颗粒接触刚度、摩擦系数、粘结系数等定义月壤本构模型,仿真钻取过程,对比钻取消耗能量和钻进阻力。计算结果表明螺距和转速对钻取消耗能量和钻进阻力影响较大,螺距越大,转速越高,钻取消耗能量和钻进阻力越大,且与螺距和转速呈线性关系。研究结果可为月表采样机构的设计与优化提供借鉴。
月壤為離散介質,其力學行為不僅受外部因素影響,而且受月壤顆粒形狀之間相互作用和約束因素影響,一般連續介質力學難以模擬其力學特性,而離散元法作為一種分析離散介質的數值方法,可用來模擬器具與月壤相互作用的力學行為。基于前囌聯L una-24月麵鑽取採樣過程力學機理分析,首先對鑽取運動過程進行分析,然後應用PFC3D離散元軟件,構建離散元月壤模型,通過賦予顆粒接觸剛度、摩抆繫數、粘結繫數等定義月壤本構模型,倣真鑽取過程,對比鑽取消耗能量和鑽進阻力。計算結果錶明螺距和轉速對鑽取消耗能量和鑽進阻力影響較大,螺距越大,轉速越高,鑽取消耗能量和鑽進阻力越大,且與螺距和轉速呈線性關繫。研究結果可為月錶採樣機構的設計與優化提供藉鑒。
월양위리산개질,기역학행위불부수외부인소영향,이차수월양과립형상지간상호작용화약속인소영향,일반련속개질역학난이모의기역학특성,이리산원법작위일충분석리산개질적수치방법,가용래모의기구여월양상호작용적역학행위。기우전소련L una-24월면찬취채양과정역학궤리분석,수선대찬취운동과정진행분석,연후응용PFC3D리산원연건,구건리산원월양모형,통과부여과립접촉강도、마찰계수、점결계수등정의월양본구모형,방진찬취과정,대비찬취소모능량화찬진조력。계산결과표명라거화전속대찬취소모능량화찬진조력영향교대,라거월대,전속월고,찬취소모능량화찬진조력월대,차여라거화전속정선성관계。연구결과가위월표채양궤구적설계여우화제공차감。
Lunar soil ,as a kind of discrete mediums ,w hose mechanical behavior is not just affect-ed by external factors ,but by the interactions and constraints between the soil particles .The me-chanical property of continuous mediums is difficult to simulate ,and the discrete element method (DEM ) as a numerical way to the analysis of discrete medium can be used to simulate the mechan-ical behavior between devices and the lunar soil .This paper was based on the former analysis of the drilling process on moon's surface by Soviet Luna-24 .Analyzing the process of drilling and building the lunar soil modal with the discrete element software PFC 3D was the first step ,then we defined the lunar soil's constitutive model by giving the particle contact stiffness ,coefficient of friction ,adhesion coefficient and so on .We contrasted the energy consumption and drilling re-sistance by stimulating the process of drilling .The results show that the screw pitch and rotate speed have great impact on the energy consumption and drilling resistance .The bigger the screw pitch is and the higher the speed is ,the larger the energy consumption and drilling resistance are , and they have a linear relation . T he results are conducive to the lunar surface sampling mechanism's design and optimization .