基于ARM和WinCE的嵌入式显控系统的设计

本文介绍了一种基于ARM9处理器和Wince操作系统的嵌入式显控系统的设计方法。该系统设计了基于CSerialPort类的串口多线程,实现了ARM上位机在检测IO操作的同时与两个从机之间多串口并行通信,提高了系统的实时性。     

基于PLC和OPC的原料采样机远程监控系统

针对钢厂、电厂原料检验站的需要,本文设计出了由计算机和PLC组成的原料自动采样机二级控制系统。该系统上位机与PLC通过TCP／IP以OPC方式交换数据,并借助视频监控系统实现了设备现场无人值守。在对系统需求的分析上,设计出了控制系统的总体结构,给出了软硬件配置,介绍了各功能模块的实现过程。实际运行结果表明该系统运行稳定,获得了良好的控制效果。     

基于FPGA+DSP的全自动灯检机图像识别系统设计

针对全自动灯检机对精度、鲁棒性和实时性的要求,设计一种基于数字信号处理器(DSP)和现场可编程阵列(FPGA)数字图像处理的全自动灯检机图像识别系统。该系统采用FPGA对CMOS图像传感器采集的图像信息进行预处理,并采用高性能的DSP作为图像处理的核心部分,保证了系统性能的要求。详细介绍了系统的原理和实现方案,并在硬件系统上进行了算法验证及仿真实验。试验结果表明:该系统满足精度、实时性和适应性的设计要求。     

协同CAD系统的研究与设计

本文在对协同设计技术研究的基础上,对协同设计平台及多机网络版协同CAD系统进行了构思,重点介绍了该系统的整体架构和协同会议的工作流程,描述了系统关键模块的实现原理.最后提出了该系统的技术实现路线.     

利用89C51设计双口通迅转换系统

本文以AT89C5 1单片机为核心 ,设计实现了具有双口 2 32或双口 4 85的通信协议转换系统。详细介绍了该系统的硬件组成 ,上、下位机的通信协议及软件实现     

嵌入式运动控制系统中软件的设计

本文以ARM和SM5004的运动控制芯片构成的硬件平台为基础,分别从底层和上位机两个方面进行软件上的设计的方法,底层引入了实时操作系统Ⅱ,使得该系统能进行多任务处理,保证了系统的实时性,上位机使用VC 实现用户的交互界面。     

基于PWM的按摩机传动智能控制系统设计

对按摩机转速及按摩方式控制系统进行研究设计。基于直流电机PWM调制控制技术及单片机微处理器控制技术提出总体设计方案,利用汇编语言编写程序实现按键控制,让按摩机工作在人体感觉最舒适的按摩方式和振动速度上,利用蜂鸣器报警和提示按摩完成,采用指示灯显示按摩机当前的工作状态,利用LED数码管显示按摩机当前转速。设计实现了人机交互与按摩功能。该系统能够满足舒适按摩要求,性能运行稳定、结构简单实用、性价比高。     

基于LabVIEW与PLC的旋涡泵性能参数测控系统设计

以旋涡泵性能参数测量为研究对象,完成了其测控平台的设计。在介绍测试系统工作原理及测控平台设计思路的基础上,运用下位机PLC控制系统实现试验过程的控制和数据采集,利用上位机中LabVIEW软件实现相关数据的分析、存储和实时显示,再结合OPC技术,实现上位机与下位机间的数据通信,完成了旋涡泵测试系统测控平台的开发。该平台人机界面友好,运行可靠,具有良好的开放性和可扩展性,能更好地满足旋涡泵性能测试的需要。     

全自动红枣去核机机械结构设计

为了实现红枣精准去核的功能,使红枣去核机实现自动化,研究一种具有筛选系统、上料系统和自动去核功能的自动化设备,提出了全自动红枣去核机的设计方案,分析了去核机的关键技术,制定了合理的技术路线。针对去核机的设计条件,选择关键机构和关键元器件,设计了该去核机的整体结构,确定了去核机的去核方案。     

基于FPGA控制单片机接口的远程监测系统

介绍了基于FPGA控制单片机接口实现远程监测系统的设计.该系统采用双CPU结构,下位机负责采集现场数据,上位机控制和监测下位机,FPGA作为下位机接口的控制芯片实现现场数据采集、数据液晶显示等工作.通过RS485总线实现上下位机的远程数据通信.     

Specos Sa,a Computer Program for Managing,Graphing and Manipulating Laboratory Data

ABSTRACT

A stand-alone version of the instrument automation and control program SPECOS (SPECtroscopy Operating System) has been developed for general laboratory data management, for data manipulation and processing, and for generation of presentation graphics and high quality plots. For data management, this program (SPECOS SA) provides features for data file creation, storage management, record keeping, report generation and automatic multiple file processing. For data manipulation it provides standard arithmetic functions, statistical procedures, smoothing, fitting, derivative and integral calculations, auto-and cross-correlation, and a wide variety of data transformations. The graphing and plotting functions support a variety of plotters and laser printers allowing variation of pen (color), line widths and types, plot symbols, bar graph characteristics, multipanel plots and complex graticule outlines. The program includes on-line help features and is provided with a set of instructional tutorials and test files.     

数字存储示波器触发电路的数字化技术研究

提出了一种全数字化的数字存储示波器用的触发电路结构。采用先进先出存储器 FIFO,利用其存储数据先进先出的特性 ,结合高速数字比较器的比较特性 ,控制采样数据的存储 ,从而实现触发电路的多种功能。给出了数字触发电路原理框图以及在 CPL D上的设计实现 ,并给出了应用实例     

Multiobjective optimization of injection molding parameters based on soft computing and variable complexity method

The objective of this study is to propose an intelligent methodology for efficiently optimizing the injection molding parameters when multiple constraints and multiple objectives are involved. Multiple objective functions reflecting the product quality, manufacturing cost and molding efficiency were constructed for the optimization model of injection molding parameters while multiple constraint functions reflecting the requirements of clients and the restrictions in the capacity of injection molding machines were established as well. A novel methodology integrating variable complexity methods (VCMs), constrained non-dominated sorted genetic algorithm (CNSGA), back propagation neural networks (BPNNs) and Moldflow analyses was put forward to locate the Pareto optimal solutions to the constrained multiobjective optimization problem. The VCMs enabled both the knowledge-based simplification of the optimization model and the variable-precision flow analyses of different injection molding parameter schemes. The Moldflow analyses were applied to collect the precise sample data for developing BPNNs and to fine-tune the Pareto-optimal solutions after the CNSGA-based optimization while the approximate BPNNs were utilized to efficiently compute the fitness of every individual during the evolution of CNSGA. The case study of optimizing the mold and process parameters for manufacturing mice with a compound-cavity mold demonstrated the feasibility and intelligence of proposed methodology.     

CAN总线工业测控网络系统的设计与实现

本文采用控制器局部网（CAN）和分散型计算机控制技术,成功地研制了CAN总线工业测控网络系统。该系统由多个主节点和多个从节点组成,且很好地实现了CAN总线工业控制网络的数据通信和现场测控功能。主节点监督和管理所有从节点,从节点测量和控制生产过程参数。     

热分析数据微机自动采集与处理系统

介绍了一个热分析数据微机自动采集与处理系统。该系统实现了微机对热分析仪数据进行自动采集、存储、显示及多种处理功能。提高了原设备的功能，是对旧设备进行技术改造的一次尝试。     

Multichannel digital phase sensitive detection using a field programmable gate array development platform

This paper describes the development and performance of digital phase sensitive detectors (PSDs) based on a field programmable gate array (FPGA) logic device. A FPGA development system combined with a custom analog data acquisition board provides a powerful platform for the development of digital signal processing systems. Conventional performance metrics for digital PSDs are determined by the analog front-end devices and do not represent improvements to the PSD itself. FPGAs offer a scalable platform on which digital PSDs can be implemented with enhanced capabilities including simultaneous demodulation of multiple independent analog signals at multiple frequencies with arbitrary demodulation functions. Circuits for providing dynamic frequency tracking and ultrafine (<0.001 degrees ) phase resolution are presented.     

基于FPGA的数控系统脉冲计数和原点复位功能模块设计

阐述了数控系统脉冲计数和原点复位功能的FPGA实现原理,并分析了其中的异步数据读取,信号滤波,数据溢出,四倍频计数等问题,给出了解决方法,最后探讨对原点脉冲的处理方法,以便实现数控系统的原定复位.     

Issues in the design of digital field instrument networks

There is growing interest in the use of digital communications as the means of exchanging data between the field devices and the control room equipment. Digital communications technology has been shown to be feasible in field devices. It can provide significant advantages in measurement accuracy, installation costs, multiple measurements, and secondary information. However, along with all of these benefits comes a variety of new issues that must be addressed. The powering of multiple devices connected to a single pair of wires in the presence of high-frequency signaling raises several intrinsic safety questions. Multiple devices connected to a single pair of wires and varied scan times raises issues of how to control the bus, provide bounded delays, and data transfer priorities. A message structure that passes the data between entities must be defined. Information is no longer a simple 4/20 ma signal. A stream of ones and zeros needs to be interpreted.

This paper discusses issues raised by digital communications technology in a field environment. It uses a three-layer architecture according to the ISO/OSI model and describes the functions and issues at each layer of the model. These issues are then used to show that a field communication network must satisfy unique needs. In fact, a designer is forced to make trade-offs that are non-optimum from a communication technology viewpoint. A field communication network is practical and achievable. However, rational designers could arrive at different decisions, depending upon how they define and approach the problem. This is the real challenge in developing an internationally recognized solution.     

Method of digital filtration of experimental data sequences with the use of approximation spline functions

A method of digital filtration of experimental data sequences with the use of approximation spline functions is proposed. A problem of digital filtration on the basis of such functions is posed, and its general solution is given. An example of constructing approximation spline functions with control at the ends of observation intervals is considered. Results of digital filtration of aerodynamic experimental data with the use of the method developed are described.     

基于Windows CE.NET的嵌入式液压机控制系统研制

针对国内液压机数控化程度低的现状以及对具有人机化界面、可调整性、控制精度高的液压设备的迫切需求。基于Windows CE．NET开发了嵌入式液压控制系统。介绍了该系统的软硬件结构设计、液压机控制系统的任务调度以及拉深过程多模态控制策略，并实现了友好的图形化人机界面、拉深工艺数据管理、故障报警以及安全管理等功能。