Analysis of 3D curve expansion of conical oscillating tapered roller follower cam with

This paper focuses on the analysis of running conditions and machining processes of conical cam with oscillating follower. We point out the common errors existing in the design and machining of the widely used plane expansion method of conical cam trough-out line. We show that the motion can be divided into two parts, i.e. the oscillating motion of oscillating bar and the rotary motion of oscillating bar relative to the conical cam. By increasing the rotary motion of oscillating bar, the motion path of tapered roller on oscillating bar （i.e. contour surface of conical cam） can be expanded on the cylinder. Based on these analyses, we present a creative and effective designing and machining method for 3D curve expansion of conical cam with oscillating follower.     

Research in non-equalization machining method for spatial cam

Many kinds of devices with cam have been widely used in various mechanical equipments. However, non-equalization machining for spatial cam trough remains to be a difficult problem. This paper focuses on the analysis of running conditions and machining processes of spatial cam with oscillating follower. We point out the common errors in the biased distance cutting. By analyzing the motion of oscillating follower of spatial cam, we present a new 3D curve expansion model of spatial cam trough-outline. Based on this model, we have proposed a machining method for trochoidal milling with non-equalization diameter cutter. This new method has led to a creative and effective way for non-equalization diameter machining for spatial cam with oscillating follower.     

滚子直动从动件盘状凸轮机构的效率分析

本对滚子直动从动件盘状凸轮机构的瞬时效率进行了分析，指出了该机构的主要尺寸对效率的影响，为更合理设计机构提供理论依据。     

用Delphi编程实现3DS MAX三维模型的读取

介绍了3DS Max建造的三维几何模型的ASE文件数据存储格式，说明了ASE文件的读取方法，结合OpenGL与Delphi开发出深海采矿作业系统可视化软件。     

基于逆向工程的弧面分度凸轮机构三维CAD

本文阐述了弧面分度凸轮机构的逆向CAD设计方案,并编写了有关计算机程序,快速、简便地计算出凸轮的廓面坐标值,最后据此数据利用Pro／ENGINEER建立了弧面分度凸轮机构的三维模型。     

桌面3D打印机工作台贴面材料分析

3D打印技术也称为快速成型,是一门新兴的技术。其中基于融熔沉积技术的桌面3D打印机应用日益广泛。为了使打印材料牢固的涂覆在打印机工作台表面,需要将一些利于粘附的材料贴附到3D打印机工作台表面。根据不同的打印耗材,应使用不同的贴面材料。文章分析了几种贴面材料的性能,使用方法,适用范围。并以使用PLA （聚乳酸）线材进行3D打印为例,分析了几种工作台贴面材料的优缺点。     

基于FLAC3D的滑坡稳定性数值模拟分析

在介绍FLAC3D基本特点的基础上,利用FLAC3D软件对万州安乐寺滑坡在水库不同蓄水位条件下的滑坡稳定性进行了流-固耦合模拟分析研究.通过建立数值计算模型和选择合理的参数,模拟得出滑坡体的塑性区分布特征和剪应变增量集中带的发展趋势.运用三维耦合分析,对水库不同蓄水水位条件下的滑坡稳定性做出评价,为滑坡的治理提供了必要的理论依据.     

四杆机构的三维CAD软件设计

图解法和解析法是设计平面四杆机构的基本方法,而使用三维CAD软件的设计方法则更高效和简便。使用这种方法的设计过程简单易懂,简便易行,大量地节省了工程人员的设计时间,避免了计算过程中的错误,可以推广应用到所有机构的设计过程中,并在教学和生产实践中取得发展。     

从多模态话语分析理论解读《泰坦尼克号》(3D版)首款海报

电影海报是宣传影片、增加票房收入的重要手段之一,观众阅读海报的过程实际上是解码一种包括了图像、文字、色彩等元素的多模态语篇的过程。系统功能语言学和视觉语法分析框架为电影海报的多模态话语分析提供了理论基础。以《泰坦尼克号》(3D版)首款海报为例,从再现意义、互动意义和构图意义三个方面进行分析解读,旨在进一步探讨图像作为社会符号如何与语言共同作用,同时以期提高读者的多模态识读能力。     

基于投影表面分析的三维多分辨率建筑物模型可视化方法

通过分析人眼的视觉特征,提出了一种基于建筑物投影表面分析的三维多分辨数据组织和可视化方法。试验结果表明,该方法可以在较短的时间内,绘制出建筑物的三维模型,有效的解决了多分辨率系统中的数据传输与显示问题。     

对称曲线槽槽轮机构的数控加工与三维造型

论述了对称曲线槽槽轮机构的极坐标设计方法,介绍了利用平移和布尔运算函数进行槽轮加工仿真的过程,通过加工仿真既可以检验加工的干涉情况,又可以完成槽轮的三维实体造型。     

传统制图课程融入三维CAD建模的教学探析

针对是否要将三维CAD建模融入工程图学教学中的问题,阐述了将三维CAD建模引入制图课程的背景,归纳了三维CAD引入制图教学中的三种教学模式,并比较了各自的形式和特点,同时分析了三维CAD与传统制图教学融合存在问题。最后指出在将三维CAD建模引入传统制图教学中时,应该着重解决传统制图教学内容与现代三维CAD建模融合与呼应的不足,使得传统制图教学与三维CAD建模有机结合。     

3D打印技术在高中立体几何教学中的应用探析

在高中立体几何教学中,灵活运用3D打印技术不仅能够使整体课程更具有实践意义,还能够进一步提升高中立体几何教学的实效性。文章概述3D打印技术,分析高中立体几何教学的现状,探讨3D打印技术在高中立体几何教学中的具体应用,以进一步提升高中立体几何教学的实效性。     

3D couette flow of dusty fluid with transpiration cooling

INTRODUCTION Transpiration cooling is a very effective process to protect certain structural elements like combustion chamber walls, exhaust nozzles, or gas turbine blades in turbojet and rocket engines, from the influence of hot gases. In view of this, Eckert (1958) obtained an exact solution of the plane couette flow with transpi-ration cooling. The problem remained 2D due to the uniform injection and suction applied at the porous plates. Flow and heat transfer along a plane wall with…     

3D打印模型结合多媒体技术在脊柱外科临床实践教学中的应用前景

为评价3D打印模型结合多媒体技术在脊柱外科临床实践教学中的实践效果。以腰椎骨折为例,利用3D打印模型结合多媒体技术进行腰椎骨折内固定术的临床实践和技能培训,并通过技能考核和问卷形式评估本科生对腰椎骨折内固定术的熟悉度。与传统教学组比较,3D打印模型结合多媒体技术的实践教学方法可以提高本科生的积极性,强化腰椎骨折内固定术的理论记忆,显著提高本科生的动手操作能力,是一种推广性强、效果显著的临床实践教学模式。     

Comparison of traditional methods with 3D computer models in the instruction of hepatobiliary anatomy

This study was designed to determine whether an interactive three-dimensional presentation depicting liver and biliary anatomy is more effective for teaching medical students than a traditional textbook format presentation of the same material. Forty-six medical students volunteered for participation in this study. Baseline demographic information, spatial ability, and knowledge of relevant anatomy were measured. Participants were randomized into two groups and presented with a computer-based interactive learning module comprised of animations and still images to highlight various anatomical structures (3D group), or a computer-based text document containing the same images and text without animation or interactive features (2D group). Following each teaching module, students completed a satisfaction survey and nine-item anatomic knowledge post-test. The 3D group scored higher on the post-test than the 2D group, with a mean score of 74% and 64%, respectively; however, when baseline differences in pretest scores were accounted for, this difference was not statistically significant (P = 0.33). Spatial ability did not statistically significantly correlate with post-test scores for the 3D group or the 2D group. In the post-test satisfaction survey the 3D group expressed a statistically significantly higher overall satisfaction rating compared to students in the 2D control group (4.5 versus 3.7 out of 5, P = 0.02). While the interactive 3D multimedia module received higher satisfaction ratings from students, it neither enhanced nor inhibited learning of complex hepatobiliary anatomy compared to an informationally equivalent traditional textbook style approach. .