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环面工具加工叶根过渡曲面的刀位可行域 被引量:3
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作者 石巍 宁涛 陈志同 《航空学报》 EI CAS CSCD 北大核心 2014年第12期3470-3479,共10页
利用环面工具加工过渡曲面时经常发生整体干涉,主要原因是缺乏对复杂环面工具加工复杂曲面时刀位可行域的研究。虽然采用常规的优化方法在大范围内对可行刀位进行搜索是可行的,但是需要耗费大量时间。为了避免刀具与过渡曲面的干涉并同... 利用环面工具加工过渡曲面时经常发生整体干涉,主要原因是缺乏对复杂环面工具加工复杂曲面时刀位可行域的研究。虽然采用常规的优化方法在大范围内对可行刀位进行搜索是可行的,但是需要耗费大量时间。为了避免刀具与过渡曲面的干涉并同时提高加工效率,研究了一种更加符合此区域结构特点的刀位优化算法,使得叶根过渡曲面得以无干涉地整体宽行加工。通过对典型叶根过渡曲面的可行刀位进行研究,发现其可行域形状为盾形,且行宽最大的刀位位于该盾形区域的两个底部边界上,有时位于该边界的端点上。根据该原理提出一种最优刀位搜索方法——沿着盾形区域底部边界搜索,应用最优化的刀位可行域以获得高的加工效率。以某航空发动机叶片的叶根过渡曲面为例进行了刀位优化计算、仿真和加工实验,验证了该方法在叶根过渡曲面加工中的有效性。 展开更多
关键词 曲面加工 环面工具 复杂曲面 刀位优化 可行域 干涉
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Development of the Investigation Tool of a Study State and Practical Use of MyPage
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作者 Yoshito Yamamoto Yasuko Hayashibara +1 位作者 Hiroshi Ichikawa Hiroo Hirose 《Computer Technology and Application》 2012年第9期594-600,共7页
Internetwork environment at university has been improved to supply often the lecture materials to students through websites. Along with such a tendency, the number of students who use PC (Personal computer) has also... Internetwork environment at university has been improved to supply often the lecture materials to students through websites. Along with such a tendency, the number of students who use PC (Personal computer) has also increased during the lesson at university. Hereupon, the authors investigate whether the students will get high scores in tests when some limitations are imposed on the students' use of the PC during lecture and when they are not. The authors create the tool to check the students' learning situation and to grasp which student is performing the PC operations, which are not related to the ongoing lesson, during the lecture. Teaching assistant carrying the iPad is made to walk around the class during the lecture and collect data of the students. In addition, the authors develop "MyPage" that the students can be given access to their personal information including individual class absence/tardiness, lesson comprehension and question understanding level of them and after using MyPage, the authors examine its effectiveness as a tool and its relationship with their attendance rate. 展开更多
关键词 Use ofwebsites student's lesson attitude limitations imposed on personal computer use.
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