基于NURBS曲线直接插补算法的嵌入式数控系统设计与实现

提出了一种结合486SX级别的X86微处理器和可编程逻辑器件CPLD两级控制的嵌入式数控系统设计方案,阐述了该系统的硬件接口电路设计;提出了基于改进S形加减速的NURBS曲线直接插补算法,在满足最大弦高误差、最大法向加速度以及最大进给速度要求的情况下,对插补曲线的加速段和减速段进行速度规划;最后采用基于该插补算法的嵌入式数控系统,在半圆形毛坯上进行了五角星NURBS曲线的实际加工,验证了所设计嵌入式数控系统的可行性和有效性,具有一定的工程应用价值。     

数控编程列表曲线的空间矢量法

提出了一种数控编程空间列表曲线的矢量法－空间三次参数样条曲线法,介绍了该方法的基本导了空间三次参数样条曲线的数学模型的矢量表达式,并给出 控加工的实例。     

A geometrical approach to computer-aided process planning for computer-controlled machine tools

This paper documents part of a research program which has been under way at the CIM Centre at Swinburne University of Technology since 1989. The purpose of the research program was to develop an open-architecture machine tool control system and then to see how that system could be used to change the distribution of traditional manufacturing design, planning and control functions. This paper examines one part of that research program and focuses on a methodology which could prove to be useful in the machine tool selection, cutter selection and cutter path generation phases of process planning for cutting operations on workpieces in computer-controlled machine tools.It is suggested that a configuration space transform be used for each cutter/machine tool combination to find the volume that the combination could remove from the uncut workpiece without removing any of the material that will form the final workpiece. A method of comparing these volumes from different combinations is then outlined. The output of this method is a reasonable sequence of machine tools and cutters. Path planning can then be carried out for each of the chosen combinations using a method similar to the one used to find the possible volume to be removed.Possible implementation techniques, and their limitations on existing computer hardware, are discussed and the most promising of these are identified, based upon some properties of configuration space transforms.     

大型点焊机器人特种作业程序镜像修正技术研究

以不锈钢列车车体点焊机器人作业路径规划编程为研究对象,针对车体对称部件,如左右侧墙点焊的的问题,提出点焊路径规划编程镜像的方法,引入X,Y,Z主轴以及龙门架E1轴系统偏差的修正和A,B,C旋转轴镜像处理的方法来调整焊钳位姿同时对焊接路径点焊位置修正镜像,并依据镜像规则在Windows环境下使用VC++语言开发了镜像程序生成器.通过仿真结果表明,该软件生成的镜像程序可与作业基准点完美衔接,最后在车间复杂环境下的实际运行验证了该方法的有效性.     

哈工大软件学院“MSE+X”软件工程硕士跨国联合培养项目(英文)

In the information time,the information technology and industry plays more and more important role in development of economy,promoting the world to be unified and emphasizing the globalization through such tendency of their own.The IT application area also becomes larger and diverse through the mergence of multiple disciplines and multiple domains.IT industry demands the inter-disciplinary talent,who are believed to be industrialized,internationalized,and equipped with multi-disciplinary and inter-domain knowledge,and the ability of international competence.Facing the challenge of the new globalization tendency of international industry especially the IT and software industry,universities keep make great efforts to provide qualify graduates to fulfill the demand of industry.This paper introduces a novel joint Master programme which aims at establishing an international education system and platform.The schema,the characteristics,the execution principles are discussed wishing to share our practice and experience with our education colleagues.     

有环网络编码关键理论问题研究

同无环网络编码研究相比,有环网络编码的理论存在更多研究空白.在实际网络中,网络编码信息流很可能交错形成环路,造成环路中链路之间逻辑因果关系混乱,时延的引入成为必须.因此,有环网络中网络编码呈现出与无环网络中不一样的特性.由于有环网络编码是网络编码实用化研究的一个关键和难点,而且有环有时延网络更接近实际网络情况,因而有环网络的研究具有较大理论和实用意义.本文从有环网络编码的数学理论框架、有环网络编码容量、码构造算法、多源有环网络编码等几个方面综述了有环网络编码的研究现状和需要进一步研究的方向.     

三角片离散法实现数控铣床加工仿真

三角片离散法是根据三轴数控铣床加工中的特点提出的加工仿真方法。文中结合笔者在微机上制作仿真软件的经验,使用三角片离散法实现数控铣床加工仿真;并详细地介绍了三角片离散法的原理、简化模型、计算方法以及提高效率的途径。该方法简单易行,而且有很好的真实感效果。     

巧用FANUC系统的刀具半径补偿功能

介绍了对刀尖补偿功能的作用、原理和使用方法 ,以车轮轮缘踏面的加工程序为例 ,说明刀具半径补偿功能的具体应用     

NC图形验证与仿真技术的研究概况

数控程序图形验证与仿真技术的研究对保证加工质量提高加工效率具有重要意义,同时也是虚拟制造技术的主要研究内容之一,该文从国外NC几何验证、NC物理验证以及我国的NC图形验证三个方面对NC图形验证技术的发展概况作了较全面的论述,并指出其中存在的不足和尚待解决的问题。最后提出一种新的复杂曲面NC图形验证的体系结构。     

数控加工仿真技术研究综述

数控加工仿真技术可以形象、直观地模拟数控加工的全过程,为验证数控加工程序的可靠性及预测切削加工过程提供了强有力的工具。介绍了数控加工仿真的关键技术——几何仿真技术、物理仿真技术和图像可视化技术,并分别对此3个数控加工仿真关键技术的研究成果进行分析评述,最后提出了数控加工仿真技术的发展趋势。