基于Web的并联雕刻机远程汉字雕刻技术

为实现资源共享和遥控作业，设计并实现了基于Web的并联雕刻机远程汉字雕刻系统，系统包括远动控制、雕刻控制和视频反馈3部分功能。采用监督控制方式以便减少网络延时对雕刻控制的影响，进程互斥原理解决了多用户同时雕刻的冲突，多线程和共享变量机制可保证雕刻作业的实时控制。为了适用不同类型的图像采集卡，基于JMF和IP组播两种方案分别实现了视频信息的连续传输。实验结果验证了该方法的可行性和有效性。     

并联机器人汉字球面雕刻刀路规划研究

目前，将并联机构应用于未来加工领域的研究已成为热点，并联机器人以其结构优势在高刚度、高强度和高精度等场合将得到广泛应用，但关于并联机器人在汉字雕刻领域的研究尚未展开。该文研究了并联机器人在球面雕刻汉字所遇到的若干问题，包括平面刀路向球面刀路的映射方法、圆弧插补及刀具姿态实时规划算法等，给出了算例并用实验室拥有的6—PURU并联机器人进行了验证，结果表明文中所提方法是有效和可行的，从而对扩大并联机器人的应用范围奠定了基础。     

并联机器人曲面汉字雕刻刀路规划算法研究

解决了并联机器人在空间曲面上雕刻汉字时所遇到的相关问题,包括平面刀路向曲面刀路的映射方法、曲线插补计算及刀具姿态实时规划算法等,给出了算例并以6-PUS并联机器人为模型进行了实验,实验结果验证了所提方法的有效性和可行性,这些方法理论上适用于任意种类的文字及空间曲面,也适用于雕刻之外的其它加工领域.     

团体操虚拟编排和演练原型系统

采用有指导的虚拟人群仿真技术，对团体操编排和演练进行计算机仿真，设计并实现了一个团体操编排和演练原型系统，该系统由团体操队形及图案设计子系统和团体操虚拟排练子系统构成．给出了系统结构与功能，并介绍了系统实现的路径规划、避碰和实时绘制等关键技术．实验结果表明，该系统能够为团体操创编人员改进队形与图案变化的设计质量和提高设计效率提供方便，为团体操编排和演练人员提供辅助工具．     

一个综合服装设计CAD系统—GMDS

本文介绍的ＧＭＤＳ系统是一个综合服装设计ＣＡＤ系统，它由创意设计、整体设计、衣片设计和试衣镜等６个子系统组成．文章介绍了该系统的系统设计、体系结构及各子系统所具有的功能，并介绍了具体实现时的一些算法．该系统对解决我国服装行业设计中存在的问题具有一定的现实意义     

语句级拼音┐汉字转换系统的设计与实现

本文系统介绍了拼音－汉字转换系统的设计与实现方法．系统主要由拼音自动分词子系统和语法分析子系统两部分组成．拼音自动分词子系统是在书面汉语自动分词系统基础上根据音字转换的特点和要求建造的．语法分析子系统是由词法分析、短语分析和句法分析三部分组成，语法分析采取关键词驱动的自底向上分析策略．由于汉语句子的构造原则与词组一致，因此语法分析是以短语分析为主，语法分析子系统的主要工作是进行分层次的短语组合     

复杂刀具CAD系统

复杂刀具ＣＡＤ系统复杂刀具ＣＡＤ系统是一个面向用户的实用系统，能完成复杂刀具的自动设计。用户输入设计参数后，系统能自动进行刀具参数的计算和检索，并进行必要的校该，最后输出技术资料，包括设计结果数据及刀具图。本系统有如下四个优点：１．系统功能集成化、智...     

基于数据仓库的综合决策支持系统的设计研究

针对钢铁企业决策支持对信息数据需求的广泛性及已有信息系统的现状，以数据仓库为基础，有效利用各种信息资源，结合模型库和知识库的应用，实现了综合决策支持系统，为钢铁企业的决策支持提供有效手段．主要介绍了该系统的理论基础、设计思想、系统结构、各子系统的功能及实现的关键技术．     

无线随机动态操作点阵式大屏幕系统的设计

无线随机动态操作点阵式大屏幕系统的设计是对当前点阵式大屏幕提出的一个创新。章详细论述了系统结构及具体实现方法，建立了较完善的无线操作与随机动态系统。系统分为手写板控制及发射子系统，编码无线传输子系统，大屏幕及控制显示子系统。同时提供了系统结构图，发射器、接收器、接收控制电路图。     

机器人辅助内镜手术系统的设计与开发

机器人应用于外科手术中，通过医生和机器人系统的合理分工和有机配合，可以提高 手术质量、改善医生工作条件、实现远程手术等．本文以纤维内镜手术为研究对象，针对术 中X射线对医护人员身体健康造成伤害的现状，设计了机器人辅助内镜手术系统，使医生可 以远程控制手术室的操作器完成内镜和手术器械的操作，实现诊断和治疗的目的．文章详细 介绍了系统的研制背景、总体设计、内镜操作器子系统原型样机设计及实验，并结合系统开 发对医疗外科机器人的人机交互接口、安全性及临床应用等问题进行了讨论．     

Open architecture of CNC system research based on CAD graph-driven technology

Based on CAD graph-driven technology, a kind of novel open architecture CNC system is put forward and designed together with the key hardware “PC+PMAC controller”. The intelligent CNC system software including several function modules is developed under Visual C++6.0 environment. Graphic feature identification and geometric parameter extraction from CAD-part-drawing saved as DXF format are performed to control the relative motion between cutting tool and part. The ant-colony algorithm is applied to auto-optimize the cutting tool paths in machining process. The experiment results of a plane engraving machining example show that the proposed method is feasible, and the entire machining process no longer needs NC programming. The efficiency of CNC machining is improved greatly, and the true intelligent CNC machining can be realized when the advanced programming technologies are integrated in one system according to the proposed conception.     

数控加工仿真系统的研究与应用

介绍数控加工仿真系统的整体设计,提出格栅voxel三维实体建模方法,刀具扫描体的生成算法,实现了刀具切削工件过程的动态仿真,并对碰撞检查算法进行了初步的研究.基于以上方法,建立了蓝天数控系统的加工仿真系统,在加工前对加工程序进行验证,在加工时对刀具轨迹的执行、工件的切削过程等进行实时监控.     

A semi-analytical approach to un-deformed chip boundary theory and cutting force prediction in face-hobbing of bevel gears

Rule-of-thumb based design for cutting tools and machining settings in face-hobbing of bevel gears result in cutting tool failures and quality issues. Lack of a virtual machining environment, to efficiently obtain the instantaneous un-deformed chip geometry and predict cutting forces in face-hobbing, causes undesirable production costs in industries. In the present paper, semi-analytical representation of the projection of the un-deformed chip on the rake face of the cutting blades is presented. The proposed approach is drastically fast and more accurate in comparison with numerical methods and can be implemented in a virtual gear machining environment. The cutting system intricate geometry, multi-axis machine tool kinematic chains and the variant cutting velocity along the cutting edge are taken into consideration to obtain the chip geometry efficiently. Then, cutting forces are predicted during face-hobbing by implementing oblique cutting theory using the derived chip geometry and converting face-hobbing into oblique cutting. The proposed methods are applied on two case studies of face-hobbing of bevel gears, and the chip geometry is derived and the cutting forces are predicted.     

Digital copy milling—autonomous milling process control without an NC program

Conventional NC machine tools do not generally allow the change of cutting conditions such as depth of cut and stepover during machining operations, once they are given machining commands as NC programs. For that reason, the NC programs must be prepared adequately and verified in advance, which requires extensive time and effort. It is therefore necessary to develop functions to generate the cutter path autonomously and control the cutting conditions adaptively during machining to optimize the cutting process, maintain stable cutting, and avoid cutting trouble. This paper proposes a new architecture to realize autonomous control of the cutting process without using NC programs. A technique called digital copy milling is developed to control the NC machine tool in real time. The digital copy milling system can generate tool paths in real time, based on the principle of copy milling. In addition, a new control strategy is developed to control the cutting conditions adaptively. A prototype of an autonomous controller was implemented in a three-axis control machining center. Thereafter, experimental milling tests were carried out to verify the effectiveness of the proposed system. The cutter paths were generated autonomously by the digital copy milling system. Results show that the cutting depth and stepover can be changed during milling tests. Cutting conditions were controlled adaptively.     

Line-based sunken relief generation from a 3D mesh

Sunken relief is an art form made by cutting the relief sculpture itself into a flat surface with a shallow overall depth. This paper focuses on the problem of direct generation of line-based sunken relief from a 3D mesh. We show how to extract, post-process and organize the messy feature lines in regular forms, applicable for lines engraving on the sculpture surfaces. We further describe how to construct a smooth height field from the input object, and derive a continuous pitting corrosion method to generate the cutting paths. The whole framework is conducted in object-space, making it flexible for stroke stylization and depth control of the engraving lines. We demonstrate the results with several impressive renderings and photographs used to illustrate the paper itself.     

电子雕刻系统光栅图像处理器的研究

电子雕刻系统采用高频电-机械转换器作为记录元件,常用的光栅图像处理器不能适用.我们研制了一种新的光栅图像处理器,在图像解析和栅格化的基础上,采用图像锐化和基于边缘检测的图像补偿方法对图像作进一步优化处理,有效地提高了雕刻图像的清晰度,减小了雕刻图像的边缘锯齿并消除了高频电-机械转换器阶跃响应滞后特性对雕刻图像的影响.实验应用表明该光栅图像处理器处理速度快,数据传输稳定可靠,处理后的图像雕刻效果好,能够满足电子雕刻系统的应用要求.     

A survey of interactive mesh‐cutting techniques and a new method for implementing generalized interactive mesh cutting using virtual tools‡

In our experience, mesh‐cutting methods can be distinguished by how their solutions address the following major issues: definition of the cut path, primitive removal and re‐meshing, number of new primitives created, when re‐meshing is performed, and representation of the cutting tool. Many researches have developed schemes for interactive mesh cutting with the goals of reducing the number of new primitives created, creating new primitives with good aspect ratios, avoiding a disconnected mesh structure between primitives in the cut path, and representing the path traversed by the tool as accurately as possible. The goal of this paper is to explain how, by using a very simple framework, one can build a generalized cutting scheme. This method allows for any arbitrary cut to be made within a virtual object, and can simulate cutting surface, layered surface or tetrahedral objects using a virtual scalpel, scissors, or loop cautery tool. This method has been implemented in a real‐time, haptic‐rate surgical simulation system allowing arbitrary cuts to be made on high‐resolution patient‐specific models. Published in 2002 by John Wiley & Sons, Ltd.     

基于RT—Linux的雕刻机数控系统开发

针对现有雕刻机的一些不足,提出了一种基于RT—Linux的雕刻机数控系统。介绍了RT—Linux系统的系统结构和工作原理,叙述了雕刻机控制系统软硬件结构,并且通过一个控制实例,阐述了基于RT-Linux雕刻机数控系统的设计方法。实践证明,基于RT—Linux的雕刻机数控系统满足实时性要求,模块化的软件设计有利于系统的扩展与维护。     

基于图像连通区域数的刀具磨损状态特征提取实验研究

为了利用计算机视觉技术进行刀具状态监测,设计了机械加工刀具状态监测实验系统,并通过将图像处理技术引入到机械加工刀具磨损状态监测中,提出了一种通过提取工件表面图像的连通区域数来判断刀具磨损状态的新方法。该方法首先采集被加工工件的表面图像;然后对图像进行预处理,并对区域行程算法进行了改进,再用改进的区域行程标记算法对机械加工工件表面图像进行标记;最后通过统计连通区域数来判断刀具的磨损状态。理论和实验分析表明,由于加工工件表面图像的连通区域数和刀具磨损有很强的相关性,其可以间接判断刀具磨损情况,从而可达到对刀具状态进行监测的目的。实验表明,该方法计算简单、识别速度快,可以有效地判断刀具的磨损状态。