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基于Newton-Rapson迭代法的NURBS插补算法的研究 被引量:8
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作者 张万军 张峰 +3 位作者 张景轩 张景怡 张景妍 许冬梅 《工业仪表与自动化装置》 2017年第5期7-12,共6页
一阶、二阶Taylor展开式求解NURBS曲线插补坐标点ui+1,存在计算量大、插补时间长等问题,该文提出了一种基于Newton-Rapson迭代法的NURBS插补算法。仿真和实验结果表明:该算法计算过程简单有效,具有可行性和实用性,可以减少插补计算量和... 一阶、二阶Taylor展开式求解NURBS曲线插补坐标点ui+1,存在计算量大、插补时间长等问题,该文提出了一种基于Newton-Rapson迭代法的NURBS插补算法。仿真和实验结果表明:该算法计算过程简单有效,具有可行性和实用性,可以减少插补计算量和插补时间,提高插补精度和加工效率,满足了数控系统实时、高速、高效率插补的要求,对其他数控插补的过程具有很强的借鉴意义。 展开更多
关键词 NURBS曲线 插补算法 Taylor展开式 Newton-rapson迭代法 实时插补
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Ralph Rapson’s Greenbelt:The Evolution of a Prototype
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作者 Francisco Gomes 《Journal of Civil Engineering and Architecture》 2021年第7期349-359,共11页
During the first decade of the 21st century,responding to a renewed public interest in modern prefabricated residential design,Ralph Rapson adapted his 1945 Case Study House#4 into a family of prototypical modular hou... During the first decade of the 21st century,responding to a renewed public interest in modern prefabricated residential design,Ralph Rapson adapted his 1945 Case Study House#4 into a family of prototypical modular house designs marketed by Wieler LLC.Like the original design,the modular designs are organized around a central daylit“greenbelt”.At the time of Rapson’s death in 2008 the modular greenbelt line included a range of prototypes from 570 to 2,700 square feet.The original Arts&Architecture Case Study House Program was defined by John Entenza around five core principles,which notably included design prototypicality and incorporation of contemporary developments in the building industry.The five Case Study House principles structure this analysis of the array of Greenbelt designs Ralph Rapson adapted to modular construction and the 21st century market response to their production.Over four years and hundreds of customer inquiries,the Greenbelt family of prototypical designs grew four times larger than the number of built examples,suggesting that design and manufacturing strategies which facilitate adaptation to specific project needs are important characteristics for success in the contemporary modular residential market. 展开更多
关键词 Building prefabrication modular construction Ralph rapson Arts&Architecture Gomes+Staub Wieler LLC
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数字图像相关方法的亚像素算法性能研究 被引量:15
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作者 李开平 蔡萍 《仪器仪表学报》 EI CAS CSCD 北大核心 2020年第8期180-187,共8页
数字图像相关方法广泛应用于多种光测力学场景,具有全场非接触等优点。数字图像相关算法的性能对光测力系统的测量精度起着决定性作用,高解算精度和效率一直是数字图像相关算法设计努力的方向对现有亚像素算法的比较分析具有重要意义。... 数字图像相关方法广泛应用于多种光测力学场景,具有全场非接触等优点。数字图像相关算法的性能对光测力系统的测量精度起着决定性作用,高解算精度和效率一直是数字图像相关算法设计努力的方向对现有亚像素算法的比较分析具有重要意义。在分析数字图像相关算法原理和4种常用亚像素算法的基础上,通过数值模拟的散斑图对4种亚像素算法的计算精度和计算效率进行了分析比较,并通过实际采集的散斑图对4种亚像素算法的性能进行了比较验证。结果显示,牛顿—拉普森迭代法的解算精度和稳定性最高,在仿真实验中的解算精度达到0.001 pixel,在实际平移实验中的解算精度达到0.04 pixel;同样条件下,基于相关系数的梯度法的计算效率最高。 展开更多
关键词 数字图像相关 亚像素 牛顿—拉普森迭代法 梯度法 曲面拟合法
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