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PMAC时基控制在非圆零件数控车削加工中的应用 被引量:2
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作者 张冰蔚 林杰 《江苏科技大学学报(自然科学版)》 CAS 北大核心 2008年第5期38-41,47,共5页
为了防止在高温、高压下工作的活塞发生敲缸和拉缸,提高其使用寿命和工作性能,活塞常被设计成中凸变椭圆.然而,中凸变椭圆的活塞给实际制造带来了很大困难.针对中凸变椭圆活塞数控车削加工对数控系统高实时性要求,构建了基于可编程多轴... 为了防止在高温、高压下工作的活塞发生敲缸和拉缸,提高其使用寿命和工作性能,活塞常被设计成中凸变椭圆.然而,中凸变椭圆的活塞给实际制造带来了很大困难.针对中凸变椭圆活塞数控车削加工对数控系统高实时性要求,构建了基于可编程多轴控制器PMAC(Program Multiple Axises Controller)的非圆截面活塞车削数控系统,其中采用了直线电机作为横向进给机构,数控系统采用了PMAC+IPC的双CPU的结构方案,将控制系统的开发平台直接构筑于IPC的软硬件之上且应用PMAC的时基控制功能代替传统的硬靠模.并在基于直线电机驱动的数控车床上编制了椭圆截面的数控加工程序,实现了该类零件的数控车削加工. 展开更多
关键词 中凸变椭圆 可编程多轴控制器 时基控制 数控加工
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Research on Spatial Pattern of Urban Landscape in Pingle Ancient Town
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作者 JIAO Libei PANG Zhiwei +3 位作者 DU Yuan LI Moxin LIU Haoran WU Ran 《Journal of Landscape Research》 2020年第5期78-82,86,共6页
Protection and development of historical and cultural ancient town have always been the hot topic.With the continuous deepening of the study of ancient town and the rise of the landscape design subject,systematic,prof... Protection and development of historical and cultural ancient town have always been the hot topic.With the continuous deepening of the study of ancient town and the rise of the landscape design subject,systematic,professional information and drawings about the landscape of ancient town are relatively scarce.To make up for the blank,Pingle Ancient Town in Chengdu was taken as the research object,and systemic research on the spatial pattern of urban landscape was conducted.In this paper,landscape features were studied in the scale of the space enclosed by urban boundaries.According to the spatial structure,the landscape features were divided into fi ve aspects:boundary,axis,skeleton,group domain and base,and detailed study was conducted in the changes of time axis.The preliminary research methods were mainly literature and site survey and mapping,and the history,environment and style of Pingle Ancient Town were discussed by referring to historical classics,journal papers and books.In the middle stage,surveying and mapping improvement work was carried out.In the later stage,papers were analyzed and written.The results of this paper included detailed mapping atlas,analysis atlas and text summary on spatial pattern of urban landscape. 展开更多
关键词 LANDSCAPE SPACE PATTERN time axis
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