Three-Dimensional Space Interpolation of Grey / Depth Image Sequence-A New Technique of Computer Graphics Synthesis

This paper advances a three-dimensional space interpolation method of grey / depth image sequence, which breaks free from the limit of original practical photographing route. Pictures can cruise at will in space. By using space sparse sampling, great memorial capacity can be saved and reproduced scenes can be controlled. To solve time consuming and complex computations in three-dimensional interpolation algorithm, we have studied a fast and practical algorithm of scattered space lattice and that of 'Warp' algorithm with proper depth. By several simple aspects of three dimensional space interpolation, we succeed in developing some simple and practical algorithms. Some results of simulated experiments with computers have shown that the new method is absolutely feasible.

Three-Dimensional Static Analysis of Nanoplates and Graphene Sheets by Using Eringen’s Nonlocal Elasticity Theory and the Perturbation Method

A three-dimensional(3D)asymptotic theory is reformulated for the static analysis of simply-supported,isotropic and orthotropic single-layered nanoplates and graphene sheets(GSs),in which Eringen’s nonlocal elasticity theory is used to capture the small length scale effect on the static behaviors of these.The perturbation method is used to expand the 3D nonlocal elasticity problems as a series of two-dimensional(2D)nonlocal plate problems,the governing equations of which for various order problems retain the same differential operators as those of the nonlocal classical plate theory(CST),although with different nonhomogeneous terms.Expanding the primary field variables of each order as the double Fourier series functions in the in-plane directions,we can obtain the Navier solutions of the leading-order problem,and the higher-order modifications can then be determined in a hierarchic and consistent manner.Some benchmark solutions for the static analysis of isotropic and orthotropic nanoplates and GSs subjected to sinusoidally and uniformly distributed loads are given to demonstrate the performance of the 3D nonlocal asymptotic theory.

Foreign Landscape Architecture History Teaching by Introducing Three-dimensional Graphic Analysis:A Case Study of Italian Renaissance Gardens

Taking contents of Italian Renaissance gardens in the course Foreign Landscape Architecture History as an example,this paper introduces case teaching method and analyzes application of three-dimensional graphic analysis method in case teaching in detail,aiming at typical cases of Italian Renaissance gardens,namely,Villa Medici,Fiesole and Villa d’Este,Tivoli.Three-dimensional graphic analysis can help students form intuitive feeling of terrain and space,further understand the typical gardening techniques of foreign gardens,so as to improve the teaching effect of landscape architecture history course.

Static and dynamic finite element analysis of 304 stainless steel rod and wire hot continuous rolling process

Three-dimensional finite element models were developed to analyze 304 stainless steel rod and wire hot continuous rolling process with the help of MSC.Marc software. The entire 30-pass deformation process and the actual parameters of production line were taken into account. Static and dynamic procedures were used to study the continuous rolling process with the aid of the thermo-mechanical coupled FEM of elastic-plasticity. The properties of billets, such as deformation, temperature field and rolling force, were mainly discussed. The simulation results of temperature agree well with the measured values. Comparisons of the analysis results obtained using static implicit method and dynamic implicit method were presented. It is shown that static implicit procedure is more accurate than dynamic implicit procedure and is able to simulate the rolling process with a lower speed, such as a roughing mill. Whereas, dynamic analysis shows a higher efficiency than static analysis and is fit for simulating the rolling process with a higher speed, such as a finishing mill.

SKEWED SYMMETRY DETECTION OF QUADRIC SURFACE SOLIDS UNDER ORTHOGRAPHIC PROJECTION

The skewed symmetry detection plays an improtant role in three-dimensional（3-D） reconstruction. The skewed symmetry depicts a real symmetry viewed from some unknown viewing directions. And the skewed symmetry detection can decrease the geometric constrains and the complexity of 3-D reconstruction. The detection technique for the quadric curve ellipse proposed by Sugimoto is improved to further cover quadric curves including hyperbola and parabola. With the parametric detection, the 3-D quadric curve projection matching is automatical- ly accomplished. Finally, the skewed symmetry surface of the quadric surface solid is obtained. Several examples are used to verify the feasibility of the algorithm and satisfying results can be obtained.

放大电路静态在固定式偏置放大电路中的分析

论文主要从固定式偏置共射极放大电路静态工作点的分析方法出发,详细介绍了静态工作点分析常用的图解法和解析法,并对两种方法进行了对比,提出了两种方法的适用性和静态工作点选取的一般原则,为电子信息、电气自动化、机电工程、汽车、电力、城轨运营等专业的教学与学习提供了参考。

基于力图解原型的结构形态参数化生成

图解静力学由彼此交互的力图解和形图解组成,通过力图解生成形图解对方案阶段的结构形态推敲有十分积极的作用。本文首先根据认知心理学的理论,分析得出力图解原型应具备适宜的抽象水平,即中等抽象水平;其次,从结构内力方向、支座数量、构件姿态、荷载分布状态与荷载分解方式构建了二维力图解原型谱系;最后,确定参数数量、梳理参数间关系、编写程序生成多个结构形态。本文的研究目的旨在提升力图解操作的交互水平,使设计师在构思方案时更容易操作。

Equilibrium as the common ground:Introducing embodied perception into structural design with graphic statics

The analogy between the human body and architectural structures dates all the way back to ancient times and has significantly shaped the design of buildings and structures.The article examines the body’s historical influence on how structures are perceived and designed,demonstrating how the body shapes the"technical truth"dimension of structural design while oblivious to the importance of an"artistic truth"or perceptual dimension.This article aims to connect recent neuroscience findings and their implications for structural design through graphic statics and its design methods.Finally,this article proposes an equilibrium-based structural design approach for designing embodied structures based on graphic statics.

新闻视频静态图形标识分割

提出了一种新的新闻视频静态图形标识分割算法.采用时域采样选取代表帧序列,利用静态标识的时空特性定位潜在标识区域,结合标识区域的尺寸、位置等特征滤除干扰区域,最终分割出标识区域.与已有方法相比,所提方法实现简单,可以有效分割半透明标识.

磁场下半连续铸造锭坯微观组织和晶体学特征研究

在半连续铸造亚共晶Al-Fe合金过程中施加直流磁场,利用背散射电子衍射EBSD研究磁场对合金微观组织和晶体学特征的影响。结果表明:直流磁场下合金中的柱状晶转变成层片状孪晶,并且合金的组织转变伴随着晶体择优生长方向从〈100〉到〈110〉的改变。

定子双绕组感应电机风力发电系统励磁电容的优化选取

在定子双绕组感应电机(DWIG)风力发电系统中,励磁电容的优化选取对控制绕组励磁变换器(SEC)容量的最小化具有重要作用,它不仅与发电机参数、转速范围有很大关系,同时还受风力机功率曲线和负载性质的影响。本文以SEC容量最小化为目标,在分析该发电机励磁无功变化规律的基础上,研究了励磁电容优化选取的原则,采用图解法和迭代法得到带阻性负载下的优化励磁电容值。考虑到整流负载的非线性因素,利用仿真法对该值进行合理调整,最终得到带整流负载所需的优化励磁电容值。在一台18kW带整流负载的DWIG样机系统上进行了实验验证,结果表明,系统在宽转速范围内能稳定运行,励磁变换器容量约为额定输出功率的1/3,实现了励磁变换器容量最小化。

RBF径向基函数与Delaunay图映射技术在飞行器型架外形设计中应用研究

基于RBF径向基函数建立了多块对接网格块顶点运动模式,进一步耦合Delaunay图映射建立网格变形技术;利用基准网格的稀疏序列节点以及区域顶点建立Delaunay四面体映射单元,利用RBF技术操作区域顶点运动,使映射单元进行变形,从而应用映射关系实现网格变形;针对某型支线客机进行了型架外形设计,并进一步进行对型架外形进行静气动弹性计算与设计巡航外形对比,验证了所建立的型架外形设计方法的正确性;静气动弹性计算中,通过建立共用的"映射曲面",实现CFD/CSD数据高效交换。

基于GPU的大规模波动草叶实时渲染技术

本文通过有效利用图形硬件图形处理单元(GPU)的运算能力和编程性,将大量计算从CPU中分离出来,实现了自然逼真而且高效的大规模波动草叶的实时渲染。利用GPU的顶点程序进行草叶的运动计算,利用GPU的片元程序进行静态阴影的计算。本文技术由OpenGL结合Cg编程实现,达到了自然逼真的渲染效果和较高的渲染效率。

三维编织复合材料编织工艺过程仿真研究

总结了四步编织工艺的运动规律。对纱线的空间坐标进行三次B样条曲线拟合得到拟合坐标;设计实现了纱线实体的静态模型算法,根据拟合坐标得到纱线空间网格坐标并建立了纱线实体的静态模型;实现了纱线轨迹的动态展示以及实体生成过程的动态展示;构建了GUI界面并编译成了可脱离Matlab环境的独立运行程序。

分立元件放大电路的综合分析流程与教学经验

分立放大电路的静态工作点设置与交流信号的放大性能指标分析是模拟电子技术课程教学的难点与重点之一。总结多年的模拟电子技术课堂教学经验,绘制了放大电路综合分析流程框图,便于理清BJT与FET等有源元件的特性曲线和交直流等效模型与参数、放大电路的直流与小信号等效电路以及相互联系。同时,结合各等效电路的计算、图解法分析以及软件仿真数据,可综合完成对多种分立放大电路的静态与动态指标的分析计算。

图解静力学简史

从知识的难易度来讲,图解静力学并不深奥。但要将图解静力学很好融入建筑设计,却并非易事。本文通过对图解静力学及其相关联的结构概念的发展史进行简要梳理,尝试为这个难题挖掘一些有价值的线索。并最终绘制一张关于人物、时间、地域、关系等信息的谱系图,为大家对图解静力学的认识提供新的视野和进一步研究的平台。

一种微机有限元二维静弹性分析程序

介绍了作者用ＮＤＰＦＯＲＴＲＡＮ—３８６语言编制的微机有限元二维静弹性分析程序ＥＳＡＰ８．在前处理部分，用映射法对求解域进行单元自动划分，并可在屏幕上显示单元划分、载荷及约束状况；有限元分析部分采用波前法解方程组并对应力作了光滑处理；通过后处理程序可显示结构变形、等位移线及各种等应力线。整个程序采用“人机对话”方式按自由格式输入数据，具备数据错误提示及输入数据自动记录功能，应用十分方便．

C#中静态图片的特技效果

文章介绍的是在C#.NET中静态图片的特技效果的实现方法,主要使用的是Graphics类的Drawimage方法。Graphics类提供了丰富的方法在窗体上显示图片。该文通过七种效果的实现过程,介绍使用C#.NET显示静态图片的特技效果的实现方法。

基于结构性能的建筑设计简史

从建筑师的角度来看,基于结构性能的建筑设计的发展过程,按时间顺序可以被划分为三个时代:在静力学图解时代中,由于图解静力学理论的建立和应用,建筑师能够清楚地表达结构概念并试图寻求结构性能的最优方案;在力学建构时代,由于社会经济需求和结构性能设计的发展,高结构性能的特殊结构原型被广泛应用,但由于方法的不可确定性和不可重复性,建筑师亟需新的设计计算工具辅助:在结构性能生形时代,建筑师充分应用电脑计算及模拟技术,为之前的实践方法和理论注入新的血液,更重要的是,建筑师创造了许多更为科学、准确以及创新的设计方法。文章以建筑视角对基于结构性能的建筑设计的发展历史进行梳理,比较和分析目前的结构基于性能的设计方法,并评估其对当下建筑实践的价值。

建筑与结构的图形化共识——图解静力学引介

以代数化——图形化的"模型思维"为根基的"结构选型"纵然在一定程度上能填补建筑师与结构师之间的技术共识,但在非常规空间形式的探索中却难以胜任。图解静力学作为一门科学,基于完全图形化的"力流思维",在空间形式契合结构力流的自由创造方面,为建筑师和结构师提供了可以直接直观的讨论平台——既能强化设计人员的"结构选型"理解,又能给予非常规形式的设计以科学方法。