提出了1种基于随机造型的椭球空腔闭孔泡沫材料三维几何建模方法。基于几何空间均匀分割得到层叠胞元空间，每个胞元空间内随机生成一个球体以形成基础孔隙造型，球体空腔均匀度因子控制基础造型随机性；胞元空间逐次随机生成若干球体空腔并通过相交特性判定，累积得到有效空腔造型，结合基于优化搜索的孔隙率自适应增长算法，提高空腔造型效率，实现目标孔隙率控制建模；考虑泡沫材料工艺及其真实几何特性，实现泡沫材料大空腔和连通缺陷建模。
This paper proposes a new 3D geometry modeling method of closed-cell foam material based on sto-chastic algorithm,with the cavity shape of spheroid.Uniform space partition method constructs the stacked unit cell space,then generate one spheroid in each unit cell to construct the basic geometry of foam,by defining the uniformity factor to control its randomness.Porosity accumulation method is developed to make the porosity reach to the target step by step,by central unit cell generate several spheroids randomly each time and intersec-tion determination to retain the feasible geometry in each step.Porosity adaptive increasing algorithm based op-timization method is also proposed to improve the modeling efficient.Besides,large cavities and overlapping flaw geometry models are also developed,considering the actual foaming process and structure features of foams.
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