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碰撞检测中计算两凸多面体间最短距离的算法研究 总被引:2,自引:0,他引:2
提出了一种计算两凸多面体问最短距离的算法.该算法用物体三维空间顶点坐标的凸包表示凸多面体,采用非线性规划方法来计算两凸多面体同最短距离,并通过最短距离来判断两凸多面体是否发生碰撞.实例证明这种方法的有效性. 相似文献
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The ice resistance on ships in escort operations in level ice are investigated using the discrete element method (DEM). A dilated polyhedron—generated by the Minkowski sum of a sphere and a polyhedron—is employed in the DEM; this dilated polyhedron-based DEM (DPDEM) is adopted to simulate the ship–ice interaction, wherein the contact force and bond-failure criterion are considered for the collision and fracture of sea ice, respectively. A three-point bending test was simulated with DPDEM, and a field test was conducted in the Bohai Sea to validate the DEM results. Further, a parametric analysis of flexural strength was conducted to identify the parameters involved in the bond-failure criterion. The ice resistance on icebreakers and cargo ships in level ice are simulated using DPDEM. The simulated ice resistances are compared with the Lindqvist and Riska formulas and the model test, which proves the validity of the DEM simulation. The interaction between ships and level ice is simulated parametrically to investigate the ice resistance on cargo ships with and without the icebreaker escort. Influencing factors such as ship speed, ice thickness, and ship breadth were examined to investigate the ice resistance on the escorted cargo ship. Analysis and change rules of the ice resistance on cargos affected by those factors were given. 相似文献
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Solidworks环境下正多面体三维建模研究 总被引:1,自引:1,他引:0
任柏林 《湖北汽车工业学院学报》2005,19(1):13-15
分析了正多面体结构的特点,通过研究正多面体外接球与特征基本体———棱锥的参数关系,应用特征复制原理,介绍了在Solidworks环境下进行正多面体三维建模的方法。 相似文献
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