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棱体成形车刀加工圆锥面工件时的形状误差分析
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作者 孔令榜 《工具技术》 北大核心 1999年第3期23-24,共2页
用棱体成形车刀加工圆锥面工件时,是否因车刀有前角就必然会产生双曲线误差,目前存在两种不同的观点。第一种观点认为,由于车刀有前角,切削刃为直线型,加工结果必然产生形状误差;第二种观点则认为,只要采取相应的工艺措施,便不... 用棱体成形车刀加工圆锥面工件时,是否因车刀有前角就必然会产生双曲线误差,目前存在两种不同的观点。第一种观点认为,由于车刀有前角,切削刃为直线型,加工结果必然产生形状误差;第二种观点则认为,只要采取相应的工艺措施,便不会产生上述形状误差。本文就这两种观... 展开更多
关键词 棱体成形车刀 圆锥面工件 形状误差分析 加工
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Blade Shape Optimization of Liquid Turbine Flow Sensor 被引量:2
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作者 郭素娜 张涛 +2 位作者 孙立军 杨振 杨文量 《Transactions of Tianjin University》 EI CAS 2016年第2期144-150,共7页
Based on the characteristic curve analysis, the method using D(K^2) square difference of meter factor at different flow rates was developed to evaluate the performance of turbine flow sensor in this study. Then accord... Based on the characteristic curve analysis, the method using D(K^2) square difference of meter factor at different flow rates was developed to evaluate the performance of turbine flow sensor in this study. Then according to the distribution of entrance velocity, it was supposed that reducing the blade area near the tip could decrease the linearity error of a sensor. Therefore, the influence of different blade shape parameters on the performance of the sensor was investigated by combining computational fluid dynamics(CFD)simulation with experimental test. The experimental results showed that, for the liquid turbine flow sensor with a diameter of 10 mm, the linearity error was smallest, and the performance of sensor was optimal when blade shape parameter equaled 0.25. 展开更多
关键词 turbine flow sensor performance evaluation method parameter optimization mathematical model CFD simulation
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Design, Development and Geometric Error Analysis of an Aerostatic Rotary Table
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作者 Verilton Nunes da Silva Luiz Henrique Melo Silva Nobrega +1 位作者 Fabio de Andrade Barroso Rafael Franklin Alves 《Journal of Mechanics Engineering and Automation》 2016年第3期133-147,共15页
Rotary tables are equipments in precision machinery applied in five-axis Machine Tools and CMM (Coordinate Measuring Machines), offering rotational (C-axis) and tilting motion (A-axis), allowing the obtaining of... Rotary tables are equipments in precision machinery applied in five-axis Machine Tools and CMM (Coordinate Measuring Machines), offering rotational (C-axis) and tilting motion (A-axis), allowing the obtaining of several configurations for manufacturing or inspection of parts with complex geometries. The demand for high accuracy, high efficiency and fewer errors in the positioning of the part in precision machines increases every day, thus ensuring their high confidence and the use of aerostatic bearings enable constructive innovations to the equipment. In this context, this work presents the mechanical design, the development and error analysis of a prototype of an aerostatic rotary table. This study emphasizes the analysis of a prototype that uses the air as a working principle for reducing friction between moving parts, increasing the mechanical efficiency, and its influence of motion error is also discussed based on the experimental results. For the geometrical errors analysis, experimental tests were realized in laboratory using a DBB (Double Ballbar). The tests are performed with only one axis moving, observing the behavior of the system for different feedrate at the C-axis. 展开更多
关键词 Rotary tables aerostatic bearings double ballbar geometric errors coordinate measuring machines.
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仿生蛾眼抗反射微纳结构衍射特性研究 被引量:3
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作者 董亭亭 陈驰 +2 位作者 熊涛 耿安兵 付跃刚 《光学与光电技术》 2017年第3期57-60,共4页
通过分析仿生蛾眼抗反射阵列周期对反射率和透射率的影响,获得了波长与周期之比与反射波能量和零级透射波能量直接相关,分界线符合±1级衍射倏逝条件。在亚波长区具有低反射率和低零级透射率,而在小周期区具有低反射率和透射率。并... 通过分析仿生蛾眼抗反射阵列周期对反射率和透射率的影响,获得了波长与周期之比与反射波能量和零级透射波能量直接相关,分界线符合±1级衍射倏逝条件。在亚波长区具有低反射率和低零级透射率,而在小周期区具有低反射率和透射率。并且通过引入微结构顶面与底面直径之比圆锥度系数概念来表征微结构形状,从而能够分析圆锥形、圆台形、圆柱形仿生蛾眼微纳结构之间不同形状过渡的变化趋势,进而实现了制备微纳结构形状的误差分析。 展开更多
关键词 仿生蛾眼 抗反射微纳结构 衍射特性 瑞利展开式 形状误差分析
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