基于加法生成器的低功耗测试

本文提出了一种基于算术加法生成器的测试或内建自测试的低功耗测试方法。该方法对原测试矢量进行伪格雷码编码,优化被测电路的开关活动率,从而实现低功耗测试。8位行波进位加法器和16位超前进位加法器的实验分析表明,编码后的测试矢量显著地降低了被测电路的开关活动率;基于FPGA的实验结果表明,对于8位行波进位加法器,该方法将电路的平均动态功耗降低了15．282%,对于16位超前进位加法器,则降低了12．21%。该测试方法能侦测到被测电路基本组成单元的任意组合失效;由于原电路中加法器的复用,该测试方法可将测试硬件开销降至最小,但不会降低测试性能。     

一种新的模拟集成电路输出参数测试方法

提出一种新的、基于行列式判决图的模拟集成电路输出参数测试方法。利用 Laplace展开 ,可以建立被测电路导纳矩阵的行列式判决图 ,从而计算出其输出参数—例如增益和截止频率。对于大规模模拟电路来说 ,由于导纳矩阵的稀疏性和行列式子图的共享性 ,该方法能够有效地测试出被测电路的输出参数。     

具有邻域子空间电路模块的低功耗测试设计

本论文提出了具有邻域子空间电路模块的基于累加器测试的低功耗测试方法.该方法将测试矢量进行伪格雷码编码以降低电路的开关活动率,从而减少测试功耗.FPGA实现的由3~2计数器构成的8位行波进位加法器的实验表明,该方法降低了约17%的测试动态功耗.接着研究了该低功耗测试的硬件实现.通过复用电路中的加法器,巧妙、成功地避免了额外逻辑异或功能模块的引入.该设计将测试的额外硬件开销降至最低且不需要电路结构的调整.该低功耗测试方法能测试出邻域子空间对应电路基本组建模块内的任意固定性组合失效,且不会降低原电路的性能.     

微加工多晶硅薄膜热导率T型测试结构的设计与模拟

提出了一种表面加工多晶硅薄膜热导率的T型测试结构。给出了热学模型和测试方法,并利用ANSYSTM软件进行模拟分析,验证了该测试方法是适用的。该测试方法能够实现多晶硅薄膜热导率的在线测试。     

电容分压器法测试弹流润滑状态的研究

本文介绍了一种弹流润滑过程的测试方法——电容分压器法,对该方法的测试原理、电路原理及提高测量分辨率等问题进行了详细的分析,并把该方法的测试曲线与电阻法的测试曲线进行了对比,认为电容分压器法既适合于全膜弹流润滑状态的测试,又适合于部分膜弹流润滑状态的测试,是较有前途的弹流润滑过程的测试方法。     

基于模数转换连续测试的最小化ATE存储向量

相比于数字电路来说,混合信号电路通常需要更加复杂的测试技术,数字电路可以用简单的结构进行完整的测试。由于混合信号电路中的一些内部节点和外部信号具有模拟信号特性,因此定性的功能测试需要保证每个操作步骤中的电路性能。像模数转换器和数模转换器这种混合信号设备是SoC的数字处理模块和模拟处理模块之间的接口。利用数字设备来处理现实世界的模拟信号的需求的增加使得这种混合信号设备越来越普遍。由于对混合信号设备进行测试具有高度的复杂性,因此对这些设备进行大批量人工测试效率很低,所以需要使用自动测试设备。目前学者们已经提出多种内建自测试方案来提供模拟测试激励,然而这些测试大多数采用的是传统的直方图的方法。本文提出一个模数转换器输出测试方法,该方法包含一个功能模式,可以进行实时密码分析。该方法所使用的向量并不需要大量存储资源,同时能够提供一个优于传统直方图方法的测试方案。     

电梯曳引机扭振测试新方法的研究

针对目前电梯曳引机扭振测试方法的不足,提出了曳引机扭振测试的新方法,即齿栅测试法。应用作者张光辉的发明专利"微机对脉冲信号的细分与辨向的新方法",具体阐述了齿栅测试新方法的原理与实现过程。下位机应用电路的模块化设计,上位机采用双线程的执行体系,并通过USB端口实现下位机与上位机的数据传输。进行了该方法的仿真测试试验,结果验证了该方法的正确性与可行性。该方法弥补了目前曳引机扭振测试方法的不足,具有可长时间连续测试的特点。     

雷达数字监控插件的实现与测试

对雷达数字监控插件的功能与组成进行了介绍,分析了电路工作原理,并从数字输入输出测试、热测试、串口通信测试、身份标志号测试等方面对插件测试方法进行了介绍。应用所述测试方法,可以提高雷达产品的调试效率。     

符合多标准的泄漏电流测试系统的软件实现

介绍一种基于软件实现设计符合最新IEC、UL等多种标准的泄漏电流测试系统.首先系统地研究IEC和UL两大电气安全检测标准体系,对IEC、UL的最新标准中提出的测量泄漏电流过程中所采用的多种人体阻抗网络进行分析得出频率因数,在此基础上应用软件对测得值进行加权计算实现设计符合多标准的泄漏电流测试系统.该系统由单一模拟人体阻抗网络、信号处理电路、高速AD转换、计算机和能够实现多标准测试的软件等组成.实验表明,测试系统具有测试方法符合多种标准的测试要求,电路简单,测试精度高和测试过程自动化等特点.     

基于无损全波整流电路的LVDT信号调理电路设计

提出了一种用模拟单刀双掷开关实现的无损全波整流电路。该电路的优势是不需二极管和匹配电阻,克服了二极管整流电路的误差问题。同时,基于该无损全波整流电路提出了一种五线制LVDT传感器信号调理电路设计方案,并搭建了测试平台对该电路的功能性能进行了测试,结果表明该设计方案具有较高的测试精度,并且在理论上,该方案也可应用其他类型的LVDT传感器。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.