一种手写图文分离方法

手写识别作为改善人机交互的技术之一已经变得越来越重要,涌现了大量对手写文字和手绘图形的研究工作,而作为手写识别的一个重要部分,对图形和文本的分类工作一直没有获得足够的重视。本文基于开源数据挖掘工具Weka设计并实现一种手写图文分离方法,基于LogitBoost、Random Forest和LADTree三种不同分类器的测试结果表明,Logit-Boost的综合分类效果最好。通过联合3个分类器能够实现精确的图形判定,但文本的分类效率则受限于分类效果最差的分类器。同时基于信息增益评估结果,分析了不同特征对图文分类的影响。     

高速铣床主轴驱动透平叶栅设计与数值模拟

为使高精密数控铣床的主轴转速达到160000r/min,刀头切削力矩小于0.005N·m,针对驱动摆角铣头主轴的透平式气马达叶栅进行了气动力计算和平面造型设计,利用Fluent软件对其气动特性进行了数值模拟,并与理论计算对比验证模拟的正确性.研究叶栅气动特性随进气角、叶片数和叶高变化的规律,获得了使叶栅气动性能最佳的参数组合,即进气角为21°,叶片数为36,叶片高度为3.5mm时,叶栅的气动性能最佳。     

Research on relationship between geometrical dimensions and elongation of Polycarbonate tensile specimen

To provide convenience for the translation among specimens,orthogonal experimental method was used to research the relationship between geometrical dimensions(length,width and thickness) and total elongation of polycarbonate sheet,and simulations of tensile specimens with different geometrical dimensions had been conducted by the finite element method,then regression analysis method was used to create the relationship formula between geometrical dimensions and total elongation.It was found that:the shorter the length of specimen is,the better the plasticity is,and they had the power exponent relationship;the larger the width and thickness are,the better the plasticity is,and they had the direct proportion relationship with the total elongation.     

摆角铣头气体静压轴承的工程设计与数值模拟

对转速为1.6×105r/min的精密摆角铣头主轴系统的2种气体静压轴承,即双排孔圆柱轴承和闭式平面止推轴承进行设计研究.对两种气体静压轴承在不同节流方式、不同节流孔直径下的最佳气膜厚度和对应的最大刚度进行设计计算,得到该轴承结构参数对其刚度的影响规律.利用FLUENT软件对所设计轴承的气体流动状况进行数值模拟,得到偏...