共查询到20条相似文献，搜索用时 203 毫秒
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YE Xue-rong LIANG Hui-min ZHAI Guo-fu 《浙江大学学报(A卷英文版)》2007,8(3):439-443
Reliability tolerance design of electromagnetic relay during its design period plays an essential role in guaranteeing the consistencies of reliability and output characteristic. The reliability tolerance design can ensure that the products would work well under the influence of disturbing factors (including internal interference, external interference, and machining dispersion). Com- pared with static characteristic, dynamic characteristic of electromagnetic relay can describe its operating process better. This article researches influence of the three kinds of disturbing factors on the dynamic characteristic of electromagnetic relay based on calculating dynamic characteristic. Then, the dynamic reliability tolerance design method of electromagnetic relay is discussed considering three kinds of disturbing factors. Conclusions reached can help to assure the reliability of electromagnetic relay from the beginning of design. 相似文献
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Method of reliability tolerance design based on EDA technology and its application on DC hybrid contactor 总被引：1，自引：0，他引：1
WANG Shu-juan SHA You-tao ZHANG Hui ZHAI Guo-fu 《浙江大学学报(A卷英文版)》2007,8(3):426-433
Tolerance design, including tolerance analysis and distribution, is an important part of the electronic system’s reli- ability design. The traditional design needs to construct mathematic model of material circuit, which involves large amount of workload and lacks of practicability. This paper discusses the basic theory of electronic system’s reliability tolerance design and presents a new design method based on EDA (Electronic Design Automatic) software. This method has been validated through the application research on reliability tolerance design of the DC hybrid contactor’s control circuit. 相似文献
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In this paper,proposals in the following arcas of turbogenerator torsionaloscillation(TTO)researches in China are presented:* Concerning the focal points of TTO studies;* Concerning the modelling and data acquisition of TTO;* Concerning the computation and analysis of TTO transients;* Concerning the monitoring and analyzing devices of TTO;* Concerning the countermeasures against TTO.It is concluded that researches centered on torsional oscillations caused by system dis-turbances and switching events should begin the carlier the better. 相似文献
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In this paper,a special-purpose CAD/CAM software package,BliskCad/Cam,based on a commercial CAD/CAM software Unigraphics is developed to reduce difficulties in CNC-EDM of the shrouded turbine blisks.The software package con- sists of five modules such as electrode design,path searching,and machining simulation module.Functions of BliskCad/Cam include parametrical reconstruction of 3-D model of the blisk,intelligent design of complex shaped electrode,automatic gener- ation of NC codes,search of interference-free tool path for multi-axis NC-EDM and machining simulation,etc.Experimental verification is conducted by using BliskCad/Cam and the results show that it satisfies the requirements,and can realize pre- cision machining and reduce accessorial time remarkably. 相似文献
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The researches on Critical Period Hypothesis(CPH) aims to explain the importance of the age factor in the process of learning a second language.In this essay,a critical review of the theoretical issues and empirical research on the CPH will spread out.Meanwhile,the discussion of implication and limitation of the CPH research will be concerned as well. 相似文献
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Geometrical Product Specification and verification (GPS) is an ISO standard system coveting standards of size, dimension,geometrical tolerance and surface texture of geometrical product. ISO/TC213 on the GPS has been working towards coordination of the previous standards in tolerance and related metrology in order to publish the next generation of the GPS language. This paper introduces the geometrical product specification model for design, manufacturing and verification based on the improved GPS and its new concepts,i.e., surface models, geometrical features and operations. An application example for the geometrical product specification model is then given. 相似文献
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CHEN Jie GAO Dao-ming 《浙江大学学报(A卷英文版)》2006,7(8):1416-1421
INTRODUCTION The technology of using waterjet for cleaning is an important problem in engineering. There are many researches on using waterjets for cleaning. Most of them are focused on the relationship between clean-ing parameters and cleaning effectiveness (Louis and Schikorr, 1982; Summers, 1982; Liu et al., 1999; Taggart et al., 2002). However, few researches are related to the optimization of cleaning parameters to improve cleaning performance even if it is very cru-cial for fully… 相似文献
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CHENG Si-yuan ZHANG Xiang-wei HUANG Man-hui 《重庆大学学报(英文版)》2005,4(4):185-188
1 Introduction a Planar curve approximation is a crucial issue in many applications of computer graphics, computer vision, CAD/CAM, image processing, etc., and there have been many reports in the literature on solving the curve approximation problem by using the B-splines. However, most of the existing methods required parameterization of data points on the target curve. It is a difficult task to estimate these parameters and different parameter choices may largely affect the approximation … 相似文献
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Although headhunter entered China more than twenty years,researches on it are far from enough. Current researches on human resource mainly focus on labor market and on-line job hunting. However,as a national strategic industry,development path of head-hunting industry deserves in-depth research. Based on previous studies and the status quo of domestic headhunting industry,the below statements tries to analyze the domestic head-hunting industry and find out the gap between Chinese and American head-hunting industry. 相似文献
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高校图书馆拥有非常丰富的实体图书资源,一般仅面向本校师生开放,由此出现资源利用率低、分配不均等问题。为解决上述问题,提出一种基于Unity3D的图书馆虚拟阅读系统,通过Unity3D软件进行环境模拟和搭建,再使用C#语言实现人机交互,将虚拟阅读和虚拟漫游相结合,实现在虚拟环境中行走与阅读。实验表明,该系统可让用户沉浸在虚拟环境中学习和阅读,能够满足大众阅读需求。 相似文献
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应用Web3D引擎开发的计算机仿真系统或虚拟现实系统均需在Web浏览器上运行,需要其能快速下载和运行,并且尽量不需下载特定插件。采用基于JAVA技术的开源Web3D引擎开发的三维系统可以满足上述要求,开发的展示系统可以实现三维图形的旋转、缩放等交互功能。此外,在系统开发过程中对引擎中不完善的部分进行了必要的修正。 相似文献
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在计算机图形学教学中,许多概念使用传统的教学工具很难教授。因此,本文建立了一个三维可视化系统,将该系统运用于计算机图形学课程的课堂教学中,帮助老师讲解许多基础的图形学算法的工作。本文描述了如何使用VRML和JAVA创建applet程序和3D模型,使得计算机图形学中比较难以理解的算法可视化。文中描述了系统结构和算法分析,... 相似文献
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CHON Jaechoon LEE Yang-Won SHIBASAKI Ryosuke 《浙江大学学报(A卷英文版)》2006,7(7):1259-1265
INTRODUCTION The visualization of roadside buildings in virtual space using synthetic photorealistic view is one of the common methods for representing the background scene of Car Navigation Systems (CNS) and Internet map services. Since most of these background scenes are implemented by two-dimensional (2D) images, they may give somewhat monotonous impression due to fixed viewpoint position and orientation. For more interactive visualizations that enable arbitrary ad- justment of the … 相似文献
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在分析国内外任意三维曲面激光打标现状的基础上,通过介绍基于三维激光振镜系统自动变焦原理和面向三维激光打标加工的三维纹理数学模型的生成过程,研究了产品三维stl面展开的纹理映射算法,实现了产品三维曲面无尺寸变形和形状扭曲的激光打标方法。 相似文献
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王馨怡 《安庆师范学院学报(社会科学版)》2019,38(3):69-73
3D打印技术在为人们的生产、生活带来便利的同时也潜藏着诸多的安全风险:3D打印枪支对人身安全带来的风险,3D打印药物对健康保障带来的风险,3D打印侵权对资源所有权带来的风险,3D打印信用卡、钥匙、人脸面具对财产所有权带来的风险,3D打印人体组织对道德保障带来的风险,3D打印颠覆行业模式对工作职位保障带来的风险。面对3D打印技术的安全风险,政府和社会应采取有力的管控措施,消除不确定感,建立安全感,增强控制感。 相似文献
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讨论了3D混沌系统的反同步.基于Lyapunov稳定性理论,运用Active控制方法选择控制函数,将混沌系统的反同步问题转化为同步误差系统在原点的渐进稳定性问题,实现了3D混沌系统的反同步,最后用数值模拟验证了方法的有效性。 相似文献
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三维彩色扫描系统及算法 总被引：2，自引：0，他引：2
提出了一种大尺寸 3D物体几何形状的扫描测量系统 ,该系统由一个线结构光源和一个彩色CCD摄像机组成 .CCD摄像机两次摄取被扫描物体的图像 ,首先从激光平面中获取被扫描物体的三维信息 ,然后将 3D物体的彩色信息和三维信息自动进行叠合 ,以获得 3D物体的真实模型 . 相似文献
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三维激光扫描系统的应用研究 总被引：3，自引：0，他引：3
范海英 《辽宁科技学院学报》2009,11(2):34-35
本文就三维激光扫描成像系统的原理和发展趋势做了简要的叙述,以工程应用实例对三维激光扫描成像系统的工作流程和三维建模做了详细的说明,并对三维激光扫描系统采集的点云数据处理的方法和手段进行了研究。 相似文献