基于FPGA的高速实时数据采集存储系统设计

介绍一种基于FPGA的数据采集存储器的设计,以sparten2系列的XC2S200芯片为主控单元,结合相关外围电路和FLASH存储器K9F2G08UOM共同组成存储系统.采用双存储设计,增强了系统可靠性,实现对一路高速10MbpsPCM数据码流和一路3.75M异步串行图像数据的采集和存储.同时与测试台和计算机配合完成对采集数据的实时监测.     

基于MSP430的大容量数据采集器设计

给出了一种低成本大容量的数据采集器的方案设计,该系统以单片机MSP430F149和大容量存储芯片K9F5608为主要器件,完成了数据采集、存储、显示和串行通信等功能。文中首先介绍了该采集器的系统组成,接着详细叙述了硬件电路设计,最后给出了软件的程序框图。该数据采集器成本低、结构简单、体积小、已得到成功应用。     

基于NAND Flash的数据采集卡设计

以SAMSUNG公司的NAND Flash芯片K9F2G08U0M为存储器,以Xilinx公司的FPGA芯片XC3S400为核心控制器,设计了一款用于监测环境温度的数据采集卡,详细阐述了硬件模块设计和软件功能设计2个方面。     

基于非接CPU卡的电梯内呼认证系统设计

介绍一种基于美国德州仪器MSP430F5310微控制器、TRF7970A RFID基站芯片、复旦微电子FM1208的非接CPU卡组成的电梯内呼认证系统的设计原理、文件系统架构以及安全属性的设计。该系统立足于CPU卡的加密、认证特性,以远高于逻辑IC卡的安全性,完成了内呼卡的多功能应用。     

福田雷沃FR225E—ETX＋型履带式液压挖掘机

F1K225E—ETX＋是全新升级换代型挖掘机,以人扭矩五十铃发动机匹配原装进口正流量力土乐液压系统,动作响心更快。行走系统。选川配备9个支重轮的高稳定履带,链板更宽她长,稳定性能更好。EDS控制技术、恒功率控制系统、高效能主阀分配系统等技术的应用使F1K225E—ETX＋拥有更完美的工作表现。     

离心泵平衡孔面积对轴向力及外特性影响的研究

以IS100—65—250型离心泵为研究对象。利用CFD数值模拟与试验研究相结合的方法,对离心泵平衡孔进行了深入研究．探讨了平衡孔面积与平衡轴向力的效果、泵的外特性之间的关系。结果表明。在0≤K≤4范围内,轴向力F随K值的增大迅速减小：但在K〉4以后．随着K值的增大,轴向力减小的趋势变得非常缓慢。在密封环正常工作情况下,以轴向力减小85％为标准,对IS100—65—250型离心泵可选取K=6;如果考虑到密封环磨损后轴向力增大的因素,可适当增大K值到7．2,即平衡孔直径选取9～9．5mm。通过模拟得到的轴向力大小与利用公式计算值吻合度好,数值模拟结果与实验研究结果相一致。     

层状结构金属化合物薄膜的制备及表征

采用分析纯TiO2、Nb2O5和K2CO3粉末为原料，采用高温固相反应制备出具有层状结构的K4Nb6O17和K2Ti4O9粉末，经过湿磨和离心沉淀分离，用旋转涂敷法在石英玻璃基片表面制备K4Nb6O17和K2Ti4O9薄膜。对所制备K4Nb6O17薄膜进行H^ 离子交换和正丙胺层间插入反应，用XRD对所制备的粉末和薄膜进行了表征。结果表明：所制得的薄膜均具有层状结构，因此有希望用此方法制备半导体复合金属化合物光催化薄膜。     

线阵CCD阵列检测系统设计

以TCD1208AP为例，叙述了线阵CCD的时序逻辑，并设计了相应的阵列检测系统。系统使用单片机作为控制单元，使用在系统可编程器件设计了CCD的时序发生器，使用模数转换器AD9243和FIFO缓存器构成高速数据采集系统。分析了时序发生器的组成原理，并基于ispLSI1016实现设计，给出了实测波形。分析了14位3 MHz模数转换器AD9243和9位4k容量的FIFO存储器IDT7204的时序，设计中使用2片IDT7204构成一个14位的缓存器．给出了数据采集系统接口电路图，并对电路设计进行了说明。     

行业

11项风机行业及相关标准获批 2014年5月6日，工业和信息化部批准了1208项行业标准，其中包含11项风机行业及相关标准，这些新标准将于2014年10月1日执行，分别是：     

闪存K9F6408U0M在小长图无纸记录仪中的应用

介绍了大容量闪存芯片在小长图无纸记录仪中的应用。在简单介绍无纸记录仪的基础上,文章详细描述了K9F6408U0M芯片的结构特点及其专用的命令指令功能和状态寄存器,给出芯片的电路图,提出内存空间的分配思想和具体的读写程序的实现。同时,借鉴虚拟仪器的思想,开发了虚拟通道技术来实现对通道的扩展。     

基于PIC18F67J60的嵌入式以太网接口设计

文中以PIC18F67J60单片机为核心,完成了嵌入式系统以太网接口的硬件平台设计,通过简化网络层次体系结构,搭建了简单的协议栈,进而完成了系统软件的设计,实现了嵌入式系统通过以太网与计算机进行通信的功能.该接口既可作为对嵌入式系统进行远程控制的控制接口,也可接入信号采集子系统,作为嵌入式系统通过以太网进行远程信息采集的通信接口.实际应用中,该接口具有实现形式简单、实时性强、性能稳定等特点,适宜远程信息采集系统使用.     

Short-Time Dynamics of Frictional Strength in Dry Friction

We present an experimental study of the onset of local frictional motion along a long, spatially extended interface that separates two PMMA blocks in dry frictional contact. At applied shear forces significantly below the static friction threshold, rapid precursory detachment fronts are excited, which propagate at near sound speeds along the interface. These fronts initiate from the interface edge and arrest prior to traversing the entire sample length. Along the fronts’ path, we perform real-time measurements of the real contact area at every spatial point within the interface. In addition, the motion (slip) of the material adjacent to the interface is simultaneously measured at chosen locations. Upon their arrival at each spatial point along their path, these fronts instantaneously (within 4 μs) reduce the net contact area. Net slip is only initiated after this contact area reduction occurs. Slip is initially rapid and progresses at its initial velocity for a constant (60 μs) duration. Slip dynamics then undergo a sharp transition to velocities an order of magnitude slower, which remain nearly constant until slip arrest. We demonstrate that this scenario can be quantitatively explained by a model of interface weakening caused by instantaneous fracture-induced heating. Sustained rapid slip occurs in this weakened phase. Once the interface cools beneath its glass temperature the sharp transition to slow slip takes place. A similar fracture-induced weakening scenario might be expected in additional classes of materials.     

小型可插拔光电模块的定位结构设计研究

光电模块是光通信行业中的核心部件,目前其光口和电口的装联主要是可插拔型结构。在可插拔型光电模块中,小型可插拔（Small Formfactor Pluggable Plus,SFP+）光电模块因封装体积小而得到广泛应用,但同时也存在较多的由插拔故障导致的信号传输不畅等问题。文中针对SFP+模块光口和电口的插拔故障进行成因分析,给出了相关的定位设计优化方案。实践证明相关优化设计可有效减少模块信号传输问题,为有效提高光电模块光口和电口结构的可靠性指明了方向。     

Dynamic rupture at a frictional interface between dissimilar materials with asperities

A numerical investigation dealing with dynamic rupture at a frictional interface between dissimilar materials is proposed. The numerical Finite Element model is comprised of two homogeneous and isotropic elastic solids which are brought into contact with friction by remote normal compression and shear traction. The applied shear traction is less than the required one to produce overall sliding of the two solids. The rupture is nucleated by decreasing instantaneously the friction coefficient to zero at the nucleation area. A “rupture” is considered when an initially sticking zone of the interface becomes in sliding state; after nucleation two propagating ruptures appeared.The properties (velocity, generated waves, interface state …) of the obtained ruptures are here analyzed for a flat interface between dissimilar materials in function of the nucleation energy; then, the analysis of the effect of the interface roughness (sinusoidal asperities) is developed. The differentiated rupture inside the asperity and the conditions for coupling or uncoupling between the waves radiating in the two bodies, in function of the asperity dimensions, have been investigated. The aim of this work is to present the results from the non-linear finite element analysis in large transformations of the dynamic rupture at the interface with contact friction between two deformable bodies with and without roughness.     

芯片封装过程热超声制造界面多参数影响的规律与控制

在中国国家自然科学基金重大项目《先进电子制造中的重要科学技术问题研究》资助下，提出芯片封装界面制造过程多参数影响规律与控制之科学问题。获得包括界面键合结构与强度生成机制、超声作用下键合界面的运动行为、超声能输入系统动力学与超声能量传递模型等3个方面的研究成果。对上述成果提出研究报告。 为认识外能场对界面物质的作用机制，采用高分辨透射电镜(High Resolution Transmission Electron Microscopy，HRTEM)观察超声键合点(Bonding Interface，BI)连接界面微结构及生成条件，观察到超声作用界面材料位错密度剧增，表明界面没有发生高温，界面超声键合是在较低的温度下进行扩散键合，推断，超声键合过程中位错/表面扩散起重要作用。提出微观位错管道快速扩散成形机制——超声键合过程中激活的原子通过位错通道迅速达到表面和晶界     

Boundary element analysis of stress singularity in dissimilar metals by friction welding

Friction-welded dissimilar metals are widely applied in automobiles, rolling stocks, machine tools, and various engineering fields. Dissimilar metals have several advantages over homogeneous metals, including high strength, material property, fatigue endurance, impact absorption, high reliability, and vibration reduction. Due to the increased use of these metals, understanding their behavior under stress conditions is necessary, especially the analysis of stress singularity on the interface of friction-welded dissimilar metals. To establish a strength evaluation method and a fracture criterion, it is necessary to analyze stress singularity on the interface of dissimilar metals with welded flashes by friction welding under various loads and temperature conditions. In this paper, a method analyzing stress singularity for the specimens with and without flashes set in friction-welded dissimilar metals is introduced using the boundary element method. The stress singularity index (??) and the stress singularity factor (??) at the interface edge are computed from the stress analysis results. The shape and flash thickness, interface length, residual stress, and load are considered in the computation. Based on these results, the variations of interface length (c) and the ratio of flash thickness (t ₂/t ₁) greatly influence the stress singularity factors at the interface edge of friction-welded dissimilar metals. The stress singularity factors will be a useful fracture parameter that considers stress singularity on the interface of dissimilar metals.     

A numerical/experimental study of contact damage in non-planar porcelain/metal bilayers

In this report, we investigate and visualize the effect of shape irregularity on contact damage in a brittle coating on a stiff metal substrate. Hertzian contact damage in a dental porcelain layer of thickness between 0.25 and 0.75 mm, fused onto a Ni–Cr alloy substrate in both curved and planar geometries was studied with the aid of the finite element method and experimental investigation. Three failure modes were examined with varying porcelain layer thickness: cone cracking at the upper surface of the porcelain, median or interface cracking at the layer/substrate interface and plastic deformation below the contact area in the substrate. It is shown that curvature has very little effect on the initiation of surface cone cracks in this system, but substantial effect on the initiation of interface radial cracks. In particular, curvature reduces the critical load for the onset of interface cracks.     

High Speed Parallel Interface for a PAR Multichannel Detector Controller and a HP9845T Minicomputer

ABSTRACT

The design and construction of a high speed parallel interface between a Hewlett-Packard 9845T minicomputer and an E G&G Princeton Applied Research Corporation (PAR) model 1216 multichannel detector controller is described. The hardware as well as the software necessary to implement this interface is discussed.     

A tribo-testing method for high performance cold forging lubricants

A tribo-testing method based on inducing different deformation patterns at the tool–workpiece interface developed by the authors was used in rating the performance of high quality lubricants. Dies which can induce different levels of maximum surface expansion under localized rod drawing set up were used. The maximum local surface expansion induced ranged from 20 to 500%. The basic feature for this test lies under the assumption that the surface expansion is proportional to the lubricant thinning and breakdown at the tool–workpiece interface. The experimental set up is coupled with die heating facilities used to raise the temperature at the interface so that the influence of temperature on the performance of the lubricant is studied. The performance of several coating-based lubricants was studies under this method. One of the goals of screening the lubricant was to identify possible lubricant candidates for replacing zinc phosphate coating based lubricant for medium forging processes. The results have demonstrated that, the effectiveness of the lubricants varies considerably with changes in the maximum local surface expansion induced at the interface and the change in the interface temperature. Of the six lubricants studied, two lubricants based on calcium and sodium soap were found to be at the same performance level as the conventional zinc phosphate coating + metal soap.