离心泵闭式叶轮反求技术研究
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摘要
采用三维激光扫描仪采集模型数据,利用激光三角法和叶轮快速曲面重构法相结合开发出了一套适用于离心泵闭式叶轮的叶轮反求方法。借助蜡模辅助成型技术测量叶轮内部流道,解决了激光扫描无法采集封闭流道的数据问题;基于ICP(迭代最近点算法)数据对齐理论进行流道与盖板精确定位,提出了一种基于"点-三角网格-曲面片-曲面"和"点-线-面"相结合的曲面重构方法,提高了建模精度与效率。通过某离心泵闭式叶轮重构实例,利用水力性能模拟,验证了该方法的可行性。
To quickly assimilate and absorb advanced technologies relating to some blades of centrifugal pumps both in domestic and abroad excellent in performance and conduct a retrofit design,a three-dimensional laser scanner was used to acquire the data of models and in combination with the quick curved surface restructuring method for impellers,the laser triangle method was employed to develop a set of reverse solution seeking methods for closed impellers of centrifugal pumps. With the help of the wax-molding shape-taking technology,the flow passages inside the impeller were measured,solving the problem that the data of a closed passage cannot be acquired by using the laser scanning method. A precision positioning of a flow passage and its cover plates was conducted based on iterative closest point( ICP) data alignment theory and a curved surface restructuring strategy based on the "point-triangle grid-curved surface patch-curved surface"in combination with "point-line-surface"was proposed,thus enhancing the modeling precision and efficiency. With a closed impeller in a centrifugal pump serving as an example,the feasibility of the method in question was verified by utilizing the hydraulic performance simulation.
To quickly assimilate and absorb advanced technologies relating to some blades of centrifugal pumps both in domestic and abroad excellent in performance and conduct a retrofit design,a three-dimensional laser scanner was used to acquire the data of models and in combination with the quick curved surface restructuring method for impellers,the laser triangle method was employed to develop a set of reverse solution seeking methods for closed impellers of centrifugal pumps. With the help of the wax-molding shape-taking technology,the flow passages inside the impeller were measured,solving the problem that the data of a closed passage cannot be acquired by using the laser scanning method. A precision positioning of a flow passage and its cover plates was conducted based on iterative closest point( ICP) data alignment theory and a curved surface restructuring strategy based on the "point-triangle grid-curved surface patch-curved surface"in combination with "point-line-surface"was proposed,thus enhancing the modeling precision and efficiency. With a closed impeller in a centrifugal pump serving as an example,the feasibility of the method in question was verified by utilizing the hydraulic performance simulation.
引文
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[2]周兵.双吸流道离心泵叶轮三维造型研究[J].水泵技术,2003(6):15-18.ZHOU bing.The 3D-model research for the impeller of double-suction centrifugal pump[J].Technical pump,2003.(6):15-18.
[3]张舜德.反求工程中三维几何形状测量及数据处理[J].机电工程技术,2001(1):7-10.ZHANG Shun-de.The measurement and data processing of three dimensional profiles in reverse engineering[J].Mechanical and electrical engineering,2001(1):7-10.
[4]成思源,谢韶旺.Geomagic studio逆向工程技术及应用[M].北京,清华大学出版社,2010.CHEN Si-yuan,XIE Shao-wang.The reverse engineering technology and application of Geomagic studio[M].Beijing,Tsinghua university press.2010.
[5]吴卫东.反求工程中的点云数据采集[J].航空制造技术,2004,(11):72-77.WU Wei-dong.Point-Cloud data acquisition in reverse engineering[J].Aeronautical Manufacturing Technology,2004,(11):72-77.
[6]王晓嘉.激光三角法综述[J].仪器仪表学报,2004,25(4):602-604.WANG Xiao-jia.Survey on the laser triangulation[J].Journal of instrument,2004,25(4):602-604.
[7]刘尚蔚,朱小超,张永光,等.多片点云数据拼接处理技术的研究[J].水利与建筑工程学报,2014,12(1):121-124.LIU Shang-wei,ZHU Xiao-chao,ZHANG Yong-guang etc.Research on processing technique of multiple point cloud data registration[J].Journal of Water Resources and Architectural Engineering,2014,12(1):121-124.
[8]黄国权,杨显惠.采用逆向工程技术对叶轮建模的研究[J].机械设计与制造,2010(2):227-229.HUANG Guo-quan,YANG Xian-hui.Research on impeller modeling by using reverse engineering technology[J].Machinery Design&Manufacture,2010(2):227-229.