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目前集成电路的设计已经进入SoC时代,介绍了SoC设计所用的系统级设计语言的发展情况,以及典型的系统级设计语言在不同设计层次上的描述能力;并介绍了几种典型的系统级设计语言,给出了这些语言之间的特点对比,最后阐述了对系统级设计语言的看法,展望了其发展前景。 相似文献
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文中通过引入虚拟设计的概念,分析了虚拟设计对产品设计方式的影响;具体介绍了虚拟设计的两种设计方式——异地网络互动设计方式和基于虚拟现实系统的设计方式;通过与以前设计方式的比较,更深一步探讨了虚拟设计如何在现代产品开发中实现,提出了虚拟设计在现代产品开发中的重要作用;通过具体的实例以及对各个国家在虚拟设计方面所做的努力分析了虚拟设计在应用方面的问题,并对今后虚拟设计的发展前景进行了展望,指出虚拟设计有待于更进一步的发展。 相似文献
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钢轨孔型设计的工作是一件非常复杂的工作,传统的手工设计已大大落后于时代的发展。本文通过把CAD技术引入到钢轨孔型的设计之中,系统地研究了钢轨孔型设计中的问题,开发了钢轨CAD设计系统。大大减轻了设计人员的工作强度,不仅设计周期短,而且设计质量高。实践证明,本系统使用效果很好。 相似文献
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钢轨孔型设计的工作是一件非常复杂的工作,传统的手工设计已大大落后于时代的发展。本文通过把CAD技术引入到钢轨孔型的设计之中,系统地研究了钢轨孔型设计中的问题,开发了钢轨CAD设计系统。大大减轻了设计人员的工作强度,不仅设计周期短,而且设计质量高。实践证明,本系统使用效果很好。 相似文献
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地空导弹系统可测试性设计 总被引:1,自引:0,他引:1
针对地空导弹武器系统检测维修困难的现状,利用可测性设计技术,提出了地空导弹武器系统可测性设计的方法。阐述了地空导弹武器中测试性设计的必要性,论述了可测性设计的基本理论,分析了地空导弹武器系统可测性设计涉及的相关问题。 相似文献
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并行设计的许多技术问题和智能CAD的主要研究可课题都同设计知识表示与设计过程建模密切相关。本文分析了设计过程的特点,提出了基于设计知识表示的设计过程模型,模型包含了设计过程中的基本操作,如选择、综合与细化。最后,基于该模型,说明产品的设计过程是一个从抽象资源到最终产品的递归过程。 相似文献
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设计规范是结构设计的重要依据,全面掌握规范的设计思想,合理运用规范的设计条文可以帮助工程师准确、高效地完成设计任务。将设计规范与计算机技术相结合,融入到CAD系统,实现“规范程序化”是工程师的愿望。该文基于协同设计的思想,采用面向对象技术设计了基于J2EE平台的结构设计规范验算系统模型,实践证明该系统在一定程度上降低了结构设计数据处理的工作量,提高了设计效率,改善了设计质量。 相似文献
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沈祖斌 《计算机测量与控制》2006,14(7):959-961
在阐明了EDA(电子设计自动化)工具各种常用的输入方法;原理图设计输入方法,硬件描述语言设计输入方法,有限状态机的设计输入方法,以及它们之间的特点的基础上,讨论了EDA设计输入方法对基于CPLD器件设计实现的影响,并详细地给出了在ALTERA公司的单片CPLD器件EPM7064上实现六位数字频率计的原理图设计方法,最后对设计的综合性能报告进行了分析比较。 相似文献
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在AutoCAD2004平台上开发了化工设计软件,阐述了软件开发的设计思想,制作和技术处理过程,在实际化工过程的设计中简化了设计中的繁杂步骤,提高了工作效率,在实践中有良好效果,该软件扩大了AutoCAD的应用范围,适用于现代教学与工程设计的需要。 相似文献
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一种基于vague集的模糊多目标决策新方法 总被引:1,自引:0,他引:1
提出一种新的基于vague集的模糊多目标决策方法。解决在无权重的情况下模糊多目标决策,所得的方法能更好的应用于模糊多目标决策,并通过例子阐明本文方法的有效性和优越性。 相似文献
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Whidborne J.F. Jun Wu Istepanian R.S.H. Jian Chu 《Automatic Control, IEEE Transactions on》2000,45(2):344
In the above-mentioned paper by Li (ibid. vol.43 (1998)), a condition is presented as necessary and sufficient to give the optimal realization of state space controllers for minimal sensitivity of all closed-loop eigenvalues subject to finite word-length effects. The condition is shown here not to be sufficient. In addition, the condition for minimal sensitivity of a single closed-loop eigenvalue presented in the above-mentioned paper is not complete. The complete conditions are presented in this paper 相似文献
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抄纸过程定量水分控制仿真研究 总被引:1,自引:0,他引:1
抄纸过程定量水分系统既存在强耦合,又具有很大纯延迟;应用Bristol方法了对定量水分系统进行了解耦,对传统Smith预估控制进行了改进并对其鲁棒性进行了分析;提出一种基于Bristol解耦控制和改进Smith预估控制的定量水分优化控制方法,该方法同时解决了耦合和纯延迟两个问题;对直接反馈控制、Bristol解耦控制、改进Smith预估控制、解耦预估优化控制方法的控制效果进行了仿真和比较,结果表明该方法具有良好的控制效果;对解耦预估控制进行了鲁棒性仿真,证明该方法具有很强的鲁棒性,具有一定的工程应用价值. 相似文献
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Lehto A. Nummela J. Ukkonen L. Sydanheimo L. Kivikoski M. 《Automation Science and Engineering, IEEE Transactions on》2009,6(1):66-79
Radio frequency identification (RFID) systems for the paper industry is an emerging research topic due to the need for an automated identification system for the paper industry which would carry on the identification codes of paper and board reels throughout their life cycle. This paper discusses the application of passive ultra-high frequency (UHF) RFID systems to the paper industry. Challenges, benefits, and the application environment of using passive UHF RFID systems in the paper industry are presented and discussed. The major challenges are development of globally operable tag antenna designs and integration of reader units and reader antennas to paper handling machinery. To confront and solve these challenges, this paper presents novel tag antenna designs for paper and board reel identification and proposes solutions for reader and reader antenna integration to paper handling machinery. In addition, the identification locations within the paper reel supply chain and the effects of RFID systems to supply chain visibility are presented and discussed. In addition, test results of using passive UHF RFID systems in the paper industry environment are presented. 相似文献
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This study examined the speed and accuracy of proof-reading a text presented on a CRT, relative to performance with print on paper. Two groups of 16 people each proof-read four published texts, roughly 1500 words per text For all readers, half the texts were presented as print on paper and half were presented on a 12 in. CRT screen. The two groups differed in whether the errors found in the screened text were recorded on the screen or on paper. The results suggested that the method of recording errors on the screen was quickly learned, but that both speed and accuracy were impaired when the text was presented on the screen. The implications of this for refereeing electronic journals is discussed. 相似文献
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JERZY E. KUREK 《International journal of control》2013,86(6):1459-1463
Using the theorem presented in this paper, one can define reconstructable states of linear system with unknown inputs using well known algorithms applied to continuous- and discrete-time systems without disturbances. An algorithm of the observer construction is also presented in the paper. 相似文献
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In this paper, based on the preconditioners presented by Rees and Greif [T. Rees, C. Greif, A preconditioner for linear systems arising from interior point optimization methods, SIAM J. Sci. Comput. 29 (2007) 1992-2007], we present a new block triangular preconditioner applied to the problem of solving linear systems arising from finite element discretization of the mixed formulation of the time-harmonic Maxwell equations (k=0) in electromagnetic problems, since linear systems arising from the corresponding equations and methods have the same matrix block structure. Similar to spectral distribution of the preconditioners presented by Rees and Greif, this paper analyzes the corresponding spectral distribution of the new preconditioners considered in this paper. From the views of theories and applications, the presented preconditioners are as efficient as the preconditioners presented by Rees and Greif to apply. Moreover, numerical experiments are also reported to illustrate the efficiency of the presented preconditioners. 相似文献
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A refined anisotropic laminated plate bending analysis is presented in a companion paper to the present work (Computers and Structures 26, 907–914, 1987). In the present paper, a refined transverse vibration and buckling analysis based on the same local model is presented. The numerical examples presented are compared with analytical solutions and classical plate theory and it is demonstrated that the present model predicts a realistic laminate global response. 相似文献