微量药品单元动态称重系统的设计与实现

提出了一种微量药品单元动态称重系统的设计方法,可依次完成药品单元的传送和分拨,并统计药品单元的质量情况.建立了药品单元动态称重的动力学模型,模型以能量守恒原理为基础,考虑了滑槽截面参数、传感器参数等因素,对不同质量药品单元的运动过程进行了分析,并利用MATLAB对分析结果进行了仿真.系统对药品单元的传送、分拨控制过程是利用称重传感器对药品单元进行测量,通过与传感器相连的模数转换器连接ARM处理器并发送药品单元质量数据,再由ARM处理器以串口通信的方式将数据发送到控制电机旋转的单片机处理器.同时,ARM处理器基于miniGUI的人机交互界面可以实时显示药品单元质量情况.仿真数据和实验结果表明:当传感器产生信号的阈值0.195 V和称重频率为1.46 s时,药品单元的动态称重过程可以成功实现.微量药品单元称重系统设计方法有效地完成了药品单元称重过程,提高了药品单元动态称重的可靠性、有效性.     

基于ARM的车载称重系统

介绍了基于ARM内核的INTEL PXA255处理器及Window CE系统的车载称重系统设计,该方案克服了传统称重系统中称重设备和车辆分离的缺点,并利用GPS系统对车辆实时监控,从而实现了交通管理部门对车辆超载的网络化智能化管理.着重介绍了该系统的软件和硬件设计方案,对数据采集处理模块设计、汽车电子控制系统的通信模块、文件传输模块进行了实例分析,并详细阐述了设计和开发的具体方法和过程.     

基于ARM9&Linux的AD转换的实现

AD转换是信号处理过程中模拟量和数字量转化的重要渠道,是信号处理过程中必不可少的一个环节.设计主要在基于工业级ARM9263处理器和嵌入式Linux操作系统的基础上,分别介绍了分辨率为12位的串行AD转换器TLC2543的主要特点和工作原理,设计了TLC2543转换器与9263处理器的接口电路,基于接口电路原理图编写了AD转换的驱动程序和相应的测试程序,借助Linux系统下的交叉编译工具分别编译驱动程序和测试程序,生成可在PC机下的超级终端运行的可执行文件,最终实现AD转换.     

基于ARM-Linux的LCD显示模块设计

介绍了基于ARM9(S3C2410)处理器的嵌入式系统中显示模块设计,根据系统结构,给出了framebuffer驱动程序设计,并且分析了驱动程序主要完成的工作和重要数据结构.然后讲述了字符显示原理,并详细介绍了基于Linux的应用软件设计,成功实现了任意字符、汉字在LCD(SHARP LQ035Q7DB02)上的显示.     

集成化便携式车辆行驶称重系统的设计

设计了基于应变式集成化称重传感器的车辆行驶称重系统,其中包括集成化称重板的结构设计、利用有限元分析软件称重仪贴片位置设计、进行集成化称重系统的动态特性分析、以及进行信号采集放大与模数转换的硬件设备等介绍,同时也介绍了测试软件.该称重系统在公路车辆限速行驶状态下,能测出行驶车辆的静态质量、行驶速度以及轴距等车辆静态参数.最终经试验验证得到了本行驶称重系统可用于交通数据采集和辅助实施超载检查.     

基于VxWorks的旋转机械状态监测系统

旋转机械状态监测对实时性和可靠性具有较高的要求,因此基于VxWorks嵌入式实时操作系统以ARM9处理器为核心设计了一种水轮机的状态监测系统.文章介绍了系统的主体硬件结构和软件设计,并对在VxWorks操作系统下基于ARM9处理器的应用程序开发如系统任务划分、网络通信程序设计等进行了重点描述.该系统目前已通过调试仿真,并具有在其他旋转机械中推广应用的潜力.     

基于ARM和CC-Link的恒压供水加压站设计

文中提出了一种基于ARM和CC-Link的恒压供水加压站设计方法,进行了硬件的设计、驱动程序以及应用程序的开发.使用ARM9微处理器和CC-Link远程设备站芯片MFP3作为系统的硬件平台,Linux作为操作系统,应用程序使用Qt/Embedded编写.通过实际运行表明,系统远行稳定,可以灵活地组建不同需求的恒压供水系统,存储和显示远程设备站工作运行情况,实现了系统设计的功能要求.     

一种基于PVDF的车辆动态称重系统设计

针对高速公路车辆超载问题,设计了一种基于PVDF的车辆动态称重系统。首先介绍了动态称重系统的硬件系统,然后比较了三类压电传感器优缺点,简述了PVDF传感器的安装,给出了电荷放大器以及信号采集器等硬件的选择,并对软件系统的设计流程进行了分析。最后设计了动态称重系统试验,对系统进行了验证。     

车辆动态称重技术

随着公路运输业和商业贸易的发展，车辆动态称重技术已成为车辆载荷测量的关键技术和发展方向。文中对车辆动态称重系统的结构和弯板、压电传感器、单传感器及光纤传感器4种常用的动态称重传感器进行了介绍，并对系统产生的轴重信号进行了分析，重点讨论和研究了算术平均、神经网络、系统辨识等运用到车辆动态称重系统中的算法，并且阐述了今后的发展趋势。     

基于ARM的车辆动态信息管理系统的设计

基于嵌入式技术、无线网络通信技术和GPS定位等技术,该文设计了一套以ARM Cortex-A9(Exyons4412)为核心控制器的车辆信息动态管理系统,实现了在特定区域内车辆的定位、信息采集,以及实时、快速地查询多个运动车辆的信息特征等动态功能。系统软硬件的综合调试结果显示,该系统能有效地提高车辆的动态信息管理能力。     

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...     

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。     

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。     

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.     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

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。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

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.