共查询到20条相似文献，搜索用时 31 毫秒
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We focused on the mathematical modeling and characteristics analysis for the nutation drive based on error parameters. The crown gear tooth profile equation was introduced according to the national standard double circular arc tooth profile and based on the equal tooth strength principle. The nutation drive meshing coordinate system was set up by introducing the cone vertex error, tilt error, nutation angle error and spiral angle error. The tooth profile equations of the double circular arc external and internal spiral bevel gears were further obtained based on the crown gear tooth profile equation concerning above mentioned error parameters. The influences of the nutation gear reducer tooth contact conditions were analyzed with the gear tilt error and axial misalignment error. Finally, the correctness of the theoretical analysis was verified by the contact spot test. 相似文献
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针对传统Ic芯片质量检测效率低、合格率低等问题,设计了一套基于模板匹配算法的Ic芯片质量视觉检测系统。利用图像采集分析算法和计算机技术,解决了运动控制、光源的选择等关键问题,在VisualC＋＋60平台下实现了该系统。它操作界面简洁、可视化,可以高效地完成芯片质量的检测,相比传统的检测方式效率大大提高。 相似文献
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鼓形齿联轴器啮合分析 总被引：1，自引：0，他引：1
易传云 《上海大学学报(英文版)》2005,9(6):527-533
This paper presents an analysis result of three-dimensional meshing of crown gear coupling （CGC） surfaces of crown gear and internal gear are established. The equation of internal gear surface is given. The equation of conjugate surface of crown gear is solved according to the principle of gearing, and that of non-conjugate crown gear is derived with crown curve of a circular arc. The meshing state of conjugate and non-conjugate surfaces is analyzed through computation of contact lines and points. It is concluded that the meshing of conjugate CGC is line-contact, there are several pairs of teeth engage simultaneously, and non-conjugate CGC has point-contact condition of meshing and only 2 pairs of teeth engage in theory. 相似文献
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随着3G技术、人工智能和云计算等关键技术的快速发展,泛在技术开始出现在多种教育场景中。然而目前国内关于泛在学习的研究,还主要集中在基本理论、技术支持、环境构建、资源服务设计以及标准规范等问题,对泛在技术在教学应用方面的研究还不太突出。深化泛在技术的具体教学应用和实践,对泛在学习研究由理论走向实践,并向教育应用纵深发展具有积极的意义。泛在技术环境下教学系统的各个要素及其关系与传统教学环境存在着内在属性的差异,需要教育实践者亲身体察。华中师范大学教育技术学62名研究生,从体验的视角,在无线网络和笔记本电脑终端构建的学习环境中,探究泛在技术环境下的学习方式、教学交互、课堂参与以及教师角色。研究发现：在泛在技术环境下,学习者以问题为中心,选择自主探究和学习共同体协作为主的方式,进行以人为本的多维互动,其整体参与度呈现多波峰的波浪式变化规律,而个体则以显性参与为主,参与体验的终端数对学生的深层参与影响较大。同时,泛在技术对教师能力提出了更高要求,强化了教师作用,教师转变为集教学组织、引导、帮助和评价于一身的多元角色。但是为了形成平等、互助、协商的学习氛围,教师需适度参与学习者互动。 相似文献
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本文介绍了在LabVIEW软件平台下,利用具有通用USB接口的摄像头开发图像实时采集与处理的虚拟仪器系统.在LabVIEW软件平台下,通过调用动态链接库驱动通用摄像头完成图像采集;同时,利用LabVIEW在PC机上进行图像处理和显示.该系统具有灵活性强、可靠性高、性价比高等优点. 相似文献
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ZHAI Guo-fu CHEN Yang-hua REN Wan-bin 《浙江大学学报(A卷英文版)》2007,8(3):422-425
The performance in vibration environment of switching apparatus containing mechanical contact is an important element when judging the apparatus’s reliability. A piecewise linear two-degrees-of-freedom mathematical model considering contact loss was built in this work, and the vibration performance of the model under random external Gaussian white noise excitation was investigated by using Monte Carlo simulation in Matlab/Simulink. Simulation showed that the spectral content and statistical characters of the contact force coincided strongly with reality. The random vibration character of the contact system was solved using time (numerical) domain simulation in this paper. Conclusions reached here are of great importance for reliability design of switching apparatus. 相似文献
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为了提高园林三维景观绿化廊道空间规划能力,需要进行空间可视化分割,提出基于锐化模板匹配的园林三维景观绿化廊道空间可视化分割方法,构建园林三维景观绿化廊道视觉图像的稀疏表示模型,采用分块模板匹配方法进行园林三维景观绿化廊道视觉图像的边缘轮廓特征分解,提取园林三维景观绿化廊道视觉分布特征量,结合锐化模板特征匹配的方法进行园林三维景观绿化廊道空间区域重构,建立园林三维景观绿化廊道空间三维视景仿真模型,采用可视化的视觉重构和特征提取方法,进行园林三维景观绿化廊道空间可视化分割。仿真结果表明,采用该方法进行园林三维景观绿化廊道空间可视化分割的自适应性较好,特征分辨能力较强,提高园林三维景观绿化廊道的设计效果。 相似文献
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利用VTK可视化工具包在Visual Studio2008平台上实现了医学序列图像三维的可视化．在对三维数据的预处理和优化基础上,在MFC实现的可交互界面上,用Marching Cubes（立方体移动）算法和Ray—casting（光线投射）算法对DICOM等格式的切片进行三维重建． 相似文献
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程玉凯 《咸阳师范学院学报》2011,26(4):36-39
基于单片机的调容式消弧线圈自动补偿控制器系统是一种新型的消弧线圈控制器,其硬件方面实现了系统计算机与控制模块、信号采集转换模块、人工界面模块等部件的设计;软件方面完成了控制器控制策略、主程序流程、软硬件抗干扰部分的设计,提高了装置的可靠性和控制精度,从而提高整个系统的工作效率。 相似文献
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知识可视化的视觉表征研究综述 总被引：5，自引：1，他引：4
知识可视化的视觉表征研究重点考察视觉表征形成中的因素及其关系。在视觉表征符号之间的结构关系研究中,多从图像形式的一般要求进行关注,尚未从视觉形式角度展开阐释;在视觉表征与知识内容的指代关系研究中,多关注可以表达什么知识,而较少根据知识传播的属性,探讨如何构建知识;在学习者与视觉表征的认知关系研究中,多考虑学习者的认知背号和知识结构,尚未从观看角度探讨如何被视觉认知;在制作者与视觉表征的表达关系研究中,以技术工具的使用方法替代了制作者的设计思路,对制作者的能动性创造过程关注不够。 相似文献
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Vijay Natarajan 《Resonance》2013,18(7):615-629
Scientific visualization refers to the study and design of visual representation of data that arises in science and engineering disciplines. The aim of the visualization is the identification of patterns leading to a better understanding of the underlying phenomena. This article will briefly introduce this topic by first providing the motivation in the form of applications, next describing a couple of well-studied visualization methods and algorithms, outlining some of the current research challenges in this area, and finally presenting a summary of related ongoing research work IISc Bangalore. 相似文献
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Based on the theory of gearing and the gear generating mechanism, this study investigates the contact characteristics of conical involute gear pairs with crossed axes. The meshing model with a reference rack as intermedium is established and tooth contact analysis （TCA） is performed to examine the meshing and bearing contact of the conical involute gear pairs composed of a pinion and a gear. Using the contact line of reference rack tooth surface, the path of contact is confirmed, and the calculation formula of principal direction, relative curvature, path of contact and ellipse of contact are derived. Finally, numerical examples are provided to demonstrate computational results and test gears are made for tooth-bearing tests. The conclusion verifies that the theory is applicable. 相似文献
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Electro-Discharge Fine Truing of Metal-Bonded Fine-Grain Diamond Wheel Based on Real-Time Monitoring 总被引：2，自引：0，他引：2
A data acquisition system based on LabVlEW is designed and implemented, and electrodischarge(ED) fine truing of metal-bonded fine-grain diamond wheel based on real-time monitoring is researched. Real-time monitoring not only makes efficient impulse specification of ED truing easily obtained, but also is good for timely identifying no-load, avoiding short circuit and arc discharge phenomena and then for obtaining normal machining state. ED fine truing of the fine-grain wheel includes two steps: rough truing for high efficiency and fine truing for high precision. Final ED truing precision and efficiency not only depend on electric process specification, but also is concerned with electrode shape, insulated performance of operating fluid and vertical feed quantity value and frequency. Experiments indicate that ED fine truing based on real-time monitoring can improve the truing precision and efficiency. Average machining efficiency of W10 wheel is about 0.95μm/min； the final run-out by ED truing is less than 2μm. 相似文献
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知识可视化视觉表征意义解读的方式为观看。根据分层传播理论,观看的过程包括视(感觉)、觉(视知觉)、记忆(信息存储)、表象编码(内容加工)和思维形成(意义建构)五个阶段。根据观看的过程,知识可视化视觉表征意义解读的过程为"看见"(即视觉感知,把握视觉表征的形式)、"看懂"(即视觉理解,分析视觉表征的内容)、"看好"(即视觉交流,产生知识传播的效果)。为了促进知识可视化视觉表征的意义解读,需要从观看的角度对其进行设计。 相似文献
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通过对案例知识库可视化的研究提出了一种案例知识库的可视化方法.案例知识可视化有利于基于案例推理系统的维护.通过堆叠类似案例知识及来源于案例特征矩阵的案例知识特征图来实现案例知识的可视化. 相似文献
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Efficient visualizations of computational algorithms are important tools for students, educators, and researchers. In this article, we point out an innovative visualization technique for matrix multiplication. This method differs from the standard, formal approach by using block matrices to make computations more visual. We find this method a helpful alternative for introducing matrix multiplication. 相似文献
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李润 《兰州石化职业技术学院学报》2012,12(1):16-18
应用Pro/E参数化和行为建模技术,实现齿轮的优化设计,分析零件的质量如何随齿轮齿数的变化而变化。首先在Pro/Engineer的建模环境中完成齿轮零件的三维建模,在完成优化设计的数学模型定义之后,转换到Pro/Mechanica工作环境中,通过灵敏度分析找出关键的设计变量（齿轮的齿数）对优化目标进行优化,从而可以根据设计者的特定要求分析出最佳的设计结果。该方法可以推广应用于其他零件的结构设计中。 相似文献