共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
为设计更薄的热风炉热风竖管底板,解决试验结果和经验公式计算结果无法反映其实际受力情况的问题,用ANSYS分析某底板的结构强度.根据该底板的结构几何模型建立有限元模型,采用SOLID 185单元划分网格.分析中不考虑固定支座处的滑动;设定砖载荷、上部竖管自重载荷、内压载荷、温度载荷等边界条件.对底板、底板下部筋板、筒体和筒体外围筋板的应力与位移分布的分析表明:底板及其筋板与竖管筒体连接处易出现应力集中现象;在热膨胀和内压的作用下,最大位移出现在底板下部筋板与筒体交界处、筒体自由边界处和筒体外围筋板的上部.计算结果表明该底板能满足结构强度要求. 相似文献
4.
5.
为探寻热解碳层对涂碳SiC纤维增强Ti-15-3钛合金基复合材料(C-SiC/Ti-15-3)中热残余应力的影响,基于复合材料细观力学方法,建立在不同热解碳层厚度时C-SiC/Ti-15-3复合材料的有限元单胞模型,模拟复合材料中热残余应力的分布.研究发现,在SiC纤维表面增加碳涂层能明显降低复合材料中的热残余应力,SiC表面的热解碳层厚度对复合材料中的热残余应力有很大影响;随着热解碳层厚度的增加,最大von Mises等效应力和径向应力呈现先减小后增大的趋势. 相似文献
6.
履带板的疲劳寿命是自行火炮维修保障体系中急缺的指标,但因测试动载荷和确定受力部位困难,至今无人尝试分析其疲劳寿命.测试动载荷是通过前人所建自行火炮行走系虚拟样机在虚拟路面上行驶实现的.通过重现仿真过程,观察履带板位置和载荷分量的幅值的对应情况,推断载荷分量的产生机理与履带板的受力部位.分析了履带板有限元多工况静应力分布.利用静应力结果和动载荷进行多载荷疲劳寿命仿真,找出了疲劳寿命薄弱位置,给出了疲劳寿命值.说明计算机仿真手段分析履带板的疲劳寿命,可以得到物理实验难以测试到的动载荷,避开繁琐的传统疲劳物理实验方法.最后提出了需进一步讨论的问题. 相似文献
7.
8.
伪随机数的性能在计算机模拟中起着决定性的作用。本文提出一种基于二项分布而设计出的“二维钉板”检验法,并把它推广到基于三项分布的“三维管网”检验法。 相似文献
9.
针对电力自动化智能装置通信板件中光电转换模块及芯片等功率元件分布集中、热流密度大、可靠性要求高等特点,采用热分析软件FLOTHERM建立了某型智能变电站测控装置通信板件精细热分析模型,模拟了板件在特定温度下元件的温升并对散热器、热流通道进行了优化,最后在高低温试验箱对板件进行温升测试,验证了仿真模型的正确性和优化结果的合理性. 相似文献
10.
11.
为提高高等院校的管理水平和决策水平,充分利用校园网资 源,开发了高等院校行政财政分析与决策系统。解决了诸如数据的动态查询、自动生成报表 、网络环境下数据共享等技术问题,具有网上数据共享、图形界面友好和安全的保密措施等 特点。 相似文献
12.
13.
The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes. 相似文献
14.
Mark A. Reynolds 《Nexus Network Journal》2001,3(2):147-150
Geometer Marcus the Marinite explores how the geometric and harmonic means can be employed compositionally within a frame;
how means function in the development of organizational field grids; how means work to develop linear perspective and proportional
grids. 相似文献
15.
为发现我国国家标准与国外发达国家标准法规的差距,从根本上提高我国国家标准的总体质量,提升我国产品的质量安全水平,以关键指标(因子)为核心,研究国内外标准法规比对的工作流程,利用面向对象的方法设计,实现了国内外标准法规比对分析系统。该系统适用于所有产品国内外标准法规的比对工作。 相似文献
16.
软件项目开发中,其设计思想有以前的面向过程到面向对象,程序的规模和需要处理的逻辑越来越复杂,面向对象技术有时也显苍白无力。组件化的编程思想很好地解决了以上矛盾,以常用黑白打印机为例。 相似文献
17.
Francesco Garibaldo 《AI & Society》2002,16(4):305-331
This article, first of all, supports the idea that the undeniable process of ICT-based technological convergence implies
the social, cultural and business unification of the world of media and culture. The poor performance of the megamerger is
a clear indicator of the unstable ground of the convergence hypothesis. Secondly, it argues in favour of cooperation between
different expertise, skills and cultures to make multimedia products or to supply multimedia services, instead of creating
from scratch a brand new class of hybrid skills and professions. Thirdly, a variety of new possible and realistically achievable
professional profiles in cultural industries and institutions are illustrated. Eventually a set of public policies, in the
light of a new role for cities and regions, is developed.
Correspondence and offprint requests to: Francesco Garibaldo, Fondazione ‘Istituto Per il Lavoro (IPL)’, via Marconi 8, 40122 Bologna, Italy. Email: f.garibaldo@ipielle.emr.it 相似文献
18.
存储系统NAS和SAN的差异和统一 总被引:6,自引:1,他引:5
分析了目前已经实现的主流网络存储技术SAN和NAS之间的差异,比较了它们之间在各方面的优劣,描述了多种实现NAS和SAN融合的手段,指出网络化存储必然相统一和融合发展,得出了IP之上存储是未来发展方向的结论。 相似文献
19.
Dimension and tolerance modeling and transformations in feature based design and manufacturing 总被引:3,自引:0,他引:3
This paper describes the development and application of a geometric dimension and tolerance (GD&T) model for use in both design and process planning. The model meets criteria for computability and compatibility with the Y14.5M standard. The model is first used to capture the designers GD&T scheme on a feature based design model, validate its completeness, and then transfer the GD&T to machining features extracted automatically by feature recognition. The model is based on relative degrees of freedom of geometric entities: feature axes, edges, faces and features-of-size. Dimension graphs are created based on the degrees of freedom for each control direction. Datum reference frames and standard tolerance classes are incorporated into the graph. The model allows dimension specification, dimension scheme modification, and dimension scheme validation. A methodology to automatically determine the GD&T of machining volumes obtained by feature recognition is also described. 相似文献
20.
李郁郁 《数字社区&智能家居》2010,(12)
PDM产品实施过程中一项重要工作是系统集成与客户化定制。对Teamcenter Engineering(简称Teamcenter)与NX系统集成客户化定制中业务建模、属性映射等相关技术进行了研究,提出了Teamcenter与NX集成客户化定制的技术思路,并以客户化定制NX工程图纸标题栏为例,介绍了Teamcenter与NX集成定制实现的关键步骤及方法。 相似文献