小天体探测是当今太阳系探测的一大热点,对小行星演化的研究有助于人们了解太阳系的起源.演化研究的一项重要内容是小天体结构的演化,即小天体在多种力学机制作用下自身形状与结构的演化.在小天体碎石堆结构的假设之下,一种比较常见的...小天体探测是当今太阳系探测的一大热点,对小行星演化的研究有助于人们了解太阳系的起源.演化研究的一项重要内容是小天体结构的演化,即小天体在多种力学机制作用下自身形状与结构的演化.在小天体碎石堆结构的假设之下,一种比较常见的模拟小天体结构演化的方法是离散元仿真算法(Discrete Element Method, DEM),目前国内外有数个团队开发了相关算法软件.本文介绍了团队开发的《基于DEM仿真算法的多粒子系统模拟软件》的基础理论、实现方法以及加速算法,并使用二体接触模型、声速传播仿真、小行星内部压强、小行星旋转稳定性仿真算例验证了算法的可靠性.展开更多
Temporary capture efficiency is studied in the framework of the circular restricted three-body problem in two steps.First, a non-uniform distribution of test particles around the secondary's orbit is obtained by f...Temporary capture efficiency is studied in the framework of the circular restricted three-body problem in two steps.First, a non-uniform distribution of test particles around the secondary's orbit is obtained by fully accounting the secondary's gravitational influence. Second, the capture efficiency is computed based on the non-uniform distribution. Several factors influencing the result are discussed. By studying the capture efficiency in the circular restricted three-body problem of different mass ratios, a power-law relation between the capture efficiency(p) and the mass ratio(μ) is established, which is given by p ≈ 0.27 × μ^(0.53), within the range of 3.0035 ×10^(-6)≤ μ ≤ 3.0034 × 10^(-5). Taking the Sun–Earth system as an example, the influence from the orbit eccentricity of the secondary on the non-uniform distribution and the capture efficiency is studied. Our studies find that the secondary's orbit eccentricity has a negative influence on the capture efficiency.展开更多
文摘小天体探测是当今太阳系探测的一大热点,对小行星演化的研究有助于人们了解太阳系的起源.演化研究的一项重要内容是小天体结构的演化,即小天体在多种力学机制作用下自身形状与结构的演化.在小天体碎石堆结构的假设之下,一种比较常见的模拟小天体结构演化的方法是离散元仿真算法(Discrete Element Method, DEM),目前国内外有数个团队开发了相关算法软件.本文介绍了团队开发的《基于DEM仿真算法的多粒子系统模拟软件》的基础理论、实现方法以及加速算法,并使用二体接触模型、声速传播仿真、小行星内部压强、小行星旋转稳定性仿真算例验证了算法的可靠性.
基金supported by the National Natural Science Foundation of China(No.12233003)the support from Laboratory of Pinghu,Pinghu,China。
文摘Temporary capture efficiency is studied in the framework of the circular restricted three-body problem in two steps.First, a non-uniform distribution of test particles around the secondary's orbit is obtained by fully accounting the secondary's gravitational influence. Second, the capture efficiency is computed based on the non-uniform distribution. Several factors influencing the result are discussed. By studying the capture efficiency in the circular restricted three-body problem of different mass ratios, a power-law relation between the capture efficiency(p) and the mass ratio(μ) is established, which is given by p ≈ 0.27 × μ^(0.53), within the range of 3.0035 ×10^(-6)≤ μ ≤ 3.0034 × 10^(-5). Taking the Sun–Earth system as an example, the influence from the orbit eccentricity of the secondary on the non-uniform distribution and the capture efficiency is studied. Our studies find that the secondary's orbit eccentricity has a negative influence on the capture efficiency.
