粒子系统的流场动态制图优化方法
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摘要
针对基于粒子系统的动态流场可视化在粒子管理体系和制图表达效果上存在的问题,该文提出了一种优化粒子管理和制图表达的方法。该方法构建了三级层次结构的粒子管理体系,更好地对流场中粒子进行控制;采用了3种粒子初始布局策略,并通过均匀性评价算法计算得出均匀性最好的分布策略;采用影响域调整的方法来控制粒子在流场中的均匀分布和动态平衡。最后分别采用传统方法和本文所提方法进行动态制图,并对两种制图效果中粒子布局情况进行分布密度评价,结果表明本文所提方法有效提高了基于粒子系统的流场动态可视化的制图效果。
Aiming at the problems of particle system-based dynamic flow field visualization in particle management system and cartographic expression,this paper proposed a method to optimize particle management and representation.The method constructed a three-level hierarchical particle management system to control the particles in the flow field better.Three initial particle placement strategies were tested and the homogeneity evaluation algorithm was used to calculate the distribution strategy with the best uniformity.The uniform distribution and dynamic equilibrium of particles in the flow field were controlled by the method of adjusting influence domain.Finally,the traditional method and the method proposed in this paper were used for dynamic cartography.The distribution density of particle layout was evaluated in two mapping results.The results showed that the method proposed in this paper effectively improved the visualization effect of the flow field based on the particle system.
Aiming at the problems of particle system-based dynamic flow field visualization in particle management system and cartographic expression,this paper proposed a method to optimize particle management and representation.The method constructed a three-level hierarchical particle management system to control the particles in the flow field better.Three initial particle placement strategies were tested and the homogeneity evaluation algorithm was used to calculate the distribution strategy with the best uniformity.The uniform distribution and dynamic equilibrium of particles in the flow field were controlled by the method of adjusting influence domain.Finally,the traditional method and the method proposed in this paper were used for dynamic cartography.The distribution density of particle layout was evaluated in two mapping results.The results showed that the method proposed in this paper effectively improved the visualization effect of the flow field based on the particle system.
引文
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[13]何珏,田丰林,张昉,等.基于实时几何流线生成的二维海流数据交互可视化方法[J].海洋技术学报,2015,34(3):91-96.(HE Jue,TIAN Fenglin,ZHANG Fang,et al.Study on the interactive visualization method of 2D ocean current data based on real-time geometric streamline generation[J].Ocean Technology,2015,34(3):91-96.)
[14]何彬彬,郭达志,方涛.基于空间统计学的空间关联挖掘[J].计算机工程,2006,32(5):20-22.(HE Binbin,GUO Dazhi,FANG Tao.Research on spatial association based on spatial statistics[J].Computer Engineering,2006,32(5):20-22.)
[15]刘明慧.径向基函数基本理论及其应用[D].长春:东北师范大学,2015:2-3.(LIU Minghui.The basic theory of radial basis function and its application[D].Changchun:Northeast Normal University,2015:2-3.)
[2]张尚弘,陈垒,赵登峰,等.基于粒子系统的流场实时模拟[J].水利水电技术,2004,35(9):47-50.(ZHANG Shanghong,CHEN Lei,ZHAO Dengfeng,et al.Realtime simulation of flow field based on particle system[J].Water Resources and Hydropower Engineering,2004,35(9):47-50.)
[3]季民,陈丽,靳奉祥,等.自适应步长的海洋流线构造算法[J].武汉大学学报(信息科学版),2014,39(9):1052-1056.(JI Min,CHEN Li,JIN Fengxiang,et al.Adaptive-step based marine fluid flow streamline constructing algorithm[J].Geomatics and Information Science of Wuhan University,2014,39(9):1052-1056.)
[4] REEVES W T.Particle systems:a technique for modeling a class of fuzzy objects[J].Computer Graphics,1983,17(3):359-376.
[5]张尚弘.都江堰水资源可持续利用及三维虚拟仿真研究[D].北京:清华大学,2004:97-98.(ZHANG Shanghong.Study on sustainable utilization of water resources and application of 3Dsimulation in Dujiangyan[D].Beijing:Tsinghua University,2004:97-98.)
[6]马照亭,潘懋,胡金星,等.一种基于数据分块的海量地形快速漫游方法[J].北京大学学报(自然科学版),2004,40(4):619-625.(MA Zhaoting,PAN Mao,HU Jinxing,et al.A fast walkthrough method for massive terrain based on data block partition[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2004,40(4):619-625.)
[7]金百东.JAVA中一类随机数生成方法设计思想[J].信息技术,2012(3):181-183.(JIN Baidong.Thinking about one type random number generation in JAVA[J].Information Technology,2012(3):181-183.)
[8] PRESS W H,TEUKOLSKY S A,VETTERLING W T,et al.Numerical recipes in C:the art of scientific computing[M].Cambridge:Cambridge University Press,1992.
[9]刘颖,张正,马恩林.关于有限集点分布均匀性的度量方法[J].首都师范大学学报(自然科学版),1997,18(3):10-14.(LIU Ying,ZHANG Zheng,MA Enlin.Some methods of measuring the uniform character of finite point sets[J].Journal of Capital Normal University(Natural Science Edition),1997,18(3):10-14.)
[10]朱尧辰.低维有限点集偏差的精确计算公式(Ⅲ)[J].科学通报,1994,39(18):1724-1725.(ZHU Xiaochen.An exact formula for calculating the deviation of a low dimensional finite point set(Ⅲ)[J].Chinese Science Bulletin,1994,39(18):1724-1725.)
[11]尤睿.基于粒子系统的三维动态流场可视化研究[D].北京:北京大学,2012:17-18.(YOU Rui.Research on particle system based visualization of 3Ddynamic flow field[D].Beijing:Peking University,2012:17-18.)
[12]付帅.基于粒子系统的全球流场可视化[D].青岛:山东科技大学,2015:12-13.(FU Shuai.Visualization of global ocean flows based on particle system[D].Qingdao:Shandong University of Science and Technology,2015:12-13.)
[13]何珏,田丰林,张昉,等.基于实时几何流线生成的二维海流数据交互可视化方法[J].海洋技术学报,2015,34(3):91-96.(HE Jue,TIAN Fenglin,ZHANG Fang,et al.Study on the interactive visualization method of 2D ocean current data based on real-time geometric streamline generation[J].Ocean Technology,2015,34(3):91-96.)
[14]何彬彬,郭达志,方涛.基于空间统计学的空间关联挖掘[J].计算机工程,2006,32(5):20-22.(HE Binbin,GUO Dazhi,FANG Tao.Research on spatial association based on spatial statistics[J].Computer Engineering,2006,32(5):20-22.)
[15]刘明慧.径向基函数基本理论及其应用[D].长春:东北师范大学,2015:2-3.(LIU Minghui.The basic theory of radial basis function and its application[D].Changchun:Northeast Normal University,2015:2-3.)
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