@inproceedings{oai:jaxa.repo.nii.ac.jp:00007385,
 author = {平林, 正稔 and 森本, 睦子 and Hirabayashi, Masatoshi and Morimoto, Mutsuko Y.},
 book = {アストロダイナミクスシンポジウム講演後刷り集, Proceedings of 18th workshop on JAXA Astrodynamics and flight mechanics},
 month = {Mar},
 note = {Symposium on Flight Mechanics and Astrodynamics 2008 (July 28-29, 2008. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)), Sagamihara, Kanagawa Japan, 衝突速度と衝突係数というパラメーターを用いて，ラブルパイル小天体の集積メカニズムについて考察する．数100[m]級のラブルパイルを衝突させ，その後の集積に焦点を当てる．この際，この二つのラブルパイルは質量・大きさともに同じものとする．考察では，衝突速度と衝突係数を変化させることによって議論を進める．質量・大きさが同じという仮定より，ラブルパイルを構成する個々の粒子の大きさの変化による集積メカニズムの特性について議論する．この解析では，バネ・ダンパー系を含むN体問題を使用する．また，更なる仮定として摩擦は無視し，また2 次元で議論を進める．この解析によって，衝突速度と衝突係数は，集積メカニズムに非常に重要な役割を持つことが示される．その一方で，上記の仮定のもとでは，粒子の大きさはあまり影響を及ぼさないということが示される．衝突速度と衝突係数では，衝突速度が0.25から0.5[m/sec]程度で集積メカニズムが大きく変化する．その一方で，衝突係数を変化させると，大きい値でのみ他の傾向とは異なる結果を示した．その他の値では，結果はほぼ同じであった．, The formation of rubble pile after a collision of two primary rubble piles is discussed, changing an initial collision velocity, its directions, and their initial radius. At initial, the two primary sub-kilometer rubble piles which have same mass and radius are collided with each other. Since rubble piles are shaped by the aggregation of many fragments affected by their gravity, the N-body simulation combining with the spring-dumper system is used to analyze the motion of each fragment. In this model, each fragment shall be a mass particle. All frictions which serve forces in the circumferential direction are neglected. Additionally, the analysis is done in 2-dimensional field. Any study conclusions is derived from comparisons of simulation data sets statistically. This analysis leads to the result that the initial collision velocity and its directions have an important role in the motion of particles. In the range from about 0.25 to 0.5 [m/sec] of the collision velocity, an intensive motion change occurs. On the other hand, changing the direction of the collision causes the result that the motion of particle has similar trends expect for that near to a glancing collision. In the vicinity of a glancing collision, the trend of formations is quite different from others. These results show same tendencies, even though the radius of the primary rubble pile is changed in the collision of sub-kilometer rubble piles., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA0064733011},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)},
 title = {N体問題を用いたラブルパイル小惑星の衝突の検討},
 volume = {2008},
 year = {2009}
}