Laser scanning path generation considering photopolymer solidification in micro-stereolithography     

Y. H. Cho  I. H. Lee  D.-W. Cho 《Microsystem Technologies》2005,11(2-3):158-167

It is essential to automate the scanning path generation process to effectively implement the micro-stereolithography. However, a scanning path that is generated based only on a 3D CAD model introduces dimensional inaccuracies. In micro-stereolithography, the photopolymer solidification is affected by fabrication conditions, such as the optical properties (laser power, laser scanning speed, laser scanning pitch focusing condition, etc.) and material properties of the photopolymer. Thus, the photopolymer solidification phenomena must be considered when generating a laser scanning path. In this paper, a scanning path generation algorithm that uses 3D CAD data and considers the photopolymer solidification phenomena is proposed to improve the dimensional accuracy in micro-stereolithography. Multi-line photopolymer solidification experiments were performed for various laser scanning conditions to examine the photopolymer solidification phenomena. From these experiments, linear relations between the solidification length (width) and scanning length (width) were acquired and stored in a database. Subsequently, these data were utilized to compensate the scanning path of the laser beam. In addition, experiments for determining the layer thickness in the z-direction were performed and these results were also used in the scanning path generation algorithm.This research was supported by the Highly Advanced National Project (http://www.most.go.kr), which performs some of the National R&D Program, and sponsored by the Korean Ministry of Science and Technology under the contract project code M10214000116-02B1500-02010.  相似文献   

WWW上路径模式发掘的研究     

韩世聪 《微型电脑应用》2000,16(6):22-23,33

本文从互连网发展的趋势入手,对路径模式发掘进行了研究。先简要介绍数据库发掘的概况及网上数据发掘的特点,后结合关联法和组合概率法,并以算法和实例详细对之进行分析。  相似文献   

Heuristics for determining a patrol path of an unmanned combat vehicle     

Chul-Hwan Park  Yeong-Dae KimBongJoo Jeong 《Computers & Industrial Engineering》2012

We consider a problem of finding a path of an unmanned combat vehicle that patrols a given area by visiting a given set of checkpoints with the objective of minimizing possibility of enemy’s infiltration. In this study, we focus on a situation in which the possibility of enemy’s infiltration at (through) each checkpoint is increased nonlinearly as time passes and the checkpoint may be patrolled multiple times during a planning horizon. We develop two-phase heuristics in which an initial path is constructed in the first phase and then it is improved in the second phase. For evaluation of the performance of the proposed heuristics, computational experiments are performed on randomly generated problem instances, and results show that the heuristics give good solutions in a reasonably short time.  相似文献   

西门子SIMOTION Delta 3D picker模型应用     

尤晨 《自动化技术与应用》2012,31(4):81-85

本文主要介绍SIMOTION运动控制系统中Delta 3D picker功能的实际应用,阐述了Delta 3D机构的控制参数设定、原点设置、三种路径插补功能在运动轨迹控制中的应用。  相似文献   

R∞关系的几个重要性质     

靖稳峰  李峰 《西安工业学院学报》2002,22(4):362-365

在二元关系R的基础上构造了R^∞关系，给出并证明了R^∞关系的几个重要性质。这些性质在粗糙集理论中研究R^∞领域系统及其近似算子时甚为重要。  相似文献   

液压挖掘机工作装置运动轨迹的智能控制及示教再现   总被引：7，自引：0，他引：7  

白桦  陆念力  吕广明 《哈尔滨建筑大学学报》2000,33(4):70-73

运用模糊智能控制方法对单斗液压挖掘机的动臂和铲土工作装置的运动过程进行跟踪,通过微机的智能化分析学习,实现轨迹控制和示教再现。它对提高单斗液压挖掘机的自控水平和工作效率具有较大意义。文中主要讨论了示教再现原理,系统组成和系统编程。  相似文献   

一维驱动二维跟踪太阳自动跟踪系统设计   总被引：8，自引：0，他引：8  

张东煜  宁铎  韩讲周  王占喜 《微计算机信息》2006,22(16):158-160

本文从对太阳方位变化规律的分析计算入手,利用天文时间来提供准确可靠的自动跟踪信号,并采用一维驱动实现二维精密跟踪的新技术。依此所设计的新型太阳能聚光器自动跟踪系统与同类产品相比,具有准确可靠、抗干扰能力强、成本低、方便实用等特点;这对于通过聚光方式推动太阳能应用具有重大的现实意义。  相似文献   

基于潮流跟踪的最小负荷削减费用计算   总被引：1，自引：0，他引：1  

赵书强  常伯涛  马燕峰  杨建华 《电力系统及其自动化学报》2008,20(6)

电网可靠性的经济性价值日益受到人们的重视,如何对其进行定量计算具有重要的现实意义.该文建立了体现电网可靠性经济价值的负荷削减费用模型,模型中综合考虑了节点负荷用户类型的分类和缺电损失评价率随停电时间的变化情况.在潮流跟踪法的基础上,提出了衡量负荷削减对缓解系统过负荷支路程度的经济性指标,并利用该指标对模型进行求解.算例结果验证了该方法的有效性和实用性.  相似文献   

马克思恩格斯关于俄国社会发展道路问题的理论     

陈方猛 《宁波工程学院学报》2006,18(1):89-92

马克思恩格斯关于俄国社会发展道路研究体现了他们一贯坚持的科学历史观和方法论。在他们看来,世界历史进程的统一性是客观存在的;世界是一个相互联系的整体,特别是到了资本主义时代,一个民族国家的社会发展道路受到历史环境的重要影响;在历史发展进程中,历史规律具有支配性作用,但人在历史规律面前绝不是无能为力的;历史的进步最终表现为物质生产方式的进步。马克思恩格斯关于俄国社会发展道路的理论对于指导中国特色社会主义建设具有重要的指导意义。  相似文献   

油气“四定”测井评价方法探讨     

白松涛  李戈理  王国平  万金彬  余春昊  程道解  姚军朋 《测井技术》2020,(3):262-267

测井解释成果是储层参数计算和油气评价的基础,为油田地质及开发研究提供重要数据依据。随着油气勘探及开发逐步转向"深、低、非、老",测井解释面临"低信噪比、低对比度、多因素",其解释方法不一、涉及的数学方法和计算步骤不同,在实际应用中存在优劣差异。基于此,提出"定性评价油气层位、定量评价油气含量、定域评价油气分布、定向评价油气通道",并从目标、手段、分析方法、输出结果等进行内涵阐述,梳理出"四定"的具体研究方法,该方法的深入应用,能够进一步拓展测井在油田全生命周期的作用,将为测井评价技术及其发展提供借鉴。  相似文献