基于LabVIEW的KWP2000协议串行通信的实现

针对汽车发动机ECU与计算机通信方法研究,为了实现KWP2000协议的串行通信,采用通过串口/K线转换器将计算机串口与K线连接,在分析研究KWP2000通信协议的基础上,通过LabVIEW图形化编程界面,按照串口通信实现的基本流程,运用LabVIEW中串口VISA组件,包括串口初始化、写入串口、读取串口和关闭串口等函数,进行了初始化程序子模块、读写程序子模块和整合母模块的设计缩短了程序开发周期,提高了编程效率,并使程序框图界面达到简洁、美观的效果,实现了基于LabVIEW的KWP2000通信系统开发。     

基于LabVIEW的阀门摩擦测试系统设计

根据阀门摩擦阻尼特性参数的测试要求,设计了基于LabVIEW的摩擦测试系统.进行了测试系统的工业控制计算机、电机驱动以及数据采集的硬件设计,采用LabVIEW实现RS232串口通信、A/D数据采集以及D/A数据输出等模块.     

.NET与LabVIEW混合环境的一种串口通信编程

针对使用LabVIEW在编程开发串口通信过程中遇到的不足,本文提出基于在.NET与LabVIEW混合环境下编程开发串口通信的方法。该方法主要采用串口收发触发中断事件,优点是代码量少、方法简洁、效率高。在实际工程运用过程中,开发人员可以综合利用.net与LabVIEW的优势来解决串口通信开发因为LabVIEW环境造成的不足。     

直线电机城市轨道试验线无线控制系统研究

为了能在控制室中观测直线电机城市轨道试验线车辆运行过程中电量参数变化并实时有效地控制车辆,研究了车辆传感器信号的无线采集与控制系统。系统基于LabVIEW软件构建上位机程序,通过串口通讯方式控制无线模块与下位机之间的指令与数据交互,下位机采用数字信号处理器TMS320F2812编程实现直线电机车辆的变频调速控制,同时采集车辆运行过程中直线电机的电压、电流等传感器信号,将采集到的数据在DSP中经过处理并通过无线传输方式发送到上位机实现人机交互。实验证明在中央控制室中能够实时测量并有效控制试验线车辆的运行状况,发送与接收的数据信号错误率为0.883‰,通过改进程序可以有效屏蔽错误指令。研究表明该无线传输方式在直线电机城市轨道实验线中不仅能够有效实现数据交互,而且达到了预期的控制目的。     

基于触摸屏和单片机共同控制的定位系统

本文介绍了一种由SST89C58单片机控制伺服电机的系统方案,包括硬件设计和软件设计.详细介绍了电子控制中常用的Modbus协议,采用Modbus协议中的ASCII模式通过串口通信实现单片机与触摸屏的通信.用单片机代替工业控制中常用的PLC做作为从机,节省了成本,单片机接收触摸屏传来的参数控制电机的运行,有效且经济地实现单片机对交流电机的控制.     

基于LabVIEW的多电机分布式控制系统

研究了基于LabVIEW的电机集群控制.采用RS-232C串行通信方厅式实现上位机与群内各电机控制主板的通信,以实时修改系统控制参数、电机运动状态监控等功能.给出了基于LabVIEW的集群控制系统拓扑结构、具体集内系统结构、串口通信接口电路、控制面板设计流程图.结果表明:利用LabVIEW开发平台的友好界面,实现实时转速、电压、电流的挖制界面图,实脱了上位机实时监控电机运动状态.整个集群控制系统应用于电机实验教学中,通过形象的图表,简单的操作,加强了学生知识到实践的应用,实现了电机集群控制系统的实时监控.     

机场消防车训练模拟器仪表系统的实现

针对单片机抗干扰能力差、精度低的缺点,采用上位机与PLC的分布式控制方式搭建了机场消防车训练模拟器仪表系统.系统结合步进电机对仪表控制的先进技术以及PLC特有的高速脉冲输出功能,充分发挥了PLC稳定性高、适应性强、抗干扰能力强的特点与步进电机定位精度高、易于控制、可靠性高的优点.同时考虑到微软控件欠灵活以及API函数过复杂的特点,系统采用在VC++6.0编程环境下的串口类SerialPort进行串口通信.试验证明,系统设计合理,仪表可以平稳、准确地运行.     

LabVIEW与三菱PLC串口通信的实现

以电机星三角降压启动监控系统为例,介绍了通过FX2N-232BD通信扩展板,实现LabVIEW 与FX2N系列PLC串口通信的方法.设计了电机星三角降压启动的PLC控制电路,编写了三菱PLC通信扩展板的通信程序,给出了上位机LabVIEW软件的监控程序,并且创建了用于人机交互的前面板.     

分布式多串口步进电机控制的设计与实现

设计了一种基于串口扩展卡的分布式步进电机控制系统.采用串口扩展卡扩展RS-232串口数,每个串口对应一个单片机.计算机通过选择串口的方式与单片机进行通信,进而控制单个步进电机.整个系统易于扩展.重点介绍了计算机与单片机之间的控制协议及系统软硬件的实现.     

用Delphi编程实现计算机与PLC的串行通信

PLC被越来越多地应用于工业控制，如何通过计算机串口编程实现计算机与PLC通信，从而达到远程监控和工业自动控制的目的显得尤为重要。本文简要地叙述了PLC的工作原理及如何用Delphi高级语言编程实现计算机与PLC的串口通信。     

Assessing Ideational and Evaluative Skills and Creative Styles and Attitudes

This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style.     

高等院校行政分析与决策系统的设计与实现

为提高高等院校的管理水平和决策水平,充分利用校园网资 源,开发了高等院校行政财政分析与决策系统。解决了诸如数据的动态查询、自动生成报表 、网络环境下数据共享等技术问题,具有网上数据共享、图形界面友好和安全的保密措施等 特点。     

Semantics and verification of monitors and systems of monitors and processes

In this paper we present a sound and complete semantics for the monitor concept of C.A.R. Hoare. First a method for specification of monitors, introduced by O.-J. Dahl, is reviewed. This method is based on the relation between the historic sequence of monitor procedure calls and the historic sequence of monitor procedure exits. Based on such specifications and our new monitor semantics we present a method by which it is possible to prove that a concrete monitor is an implementation of an abstract one. In the last part of the paper an axiomatic semantics for systems of concurrent processes and monitors is introduced. The method supports verification by separation of concerns: Properties of the communication to and from each process are proven in isolation by a usual Hoare style axiomatic semantics, while abstract monitors are also specified in isolation by the method reviewed in the first part of the paper. These properties of the components of the system are then used in a new proof rule to conclude properties of the complete system. Stein Gjessing received a Ph.D. (actually a Dr. philos.) from the University of Oslo (Norway) in 1985. Presently he is an Associate Professor at the Institute of informatics, University of Oslo, Norway. Dr. Gjessings research interests are in the area of concurrent and distributed programming, operating systems, formal specification and verification and programming languages.     

Stochastic balancing and approximation-stability and minimality

A new method of stochastic model reduction has recently been introduced by Desai et al. [1], [2]. The stability of the reduced order model has not previously, been considered. In this paper, we show that the stability of the reduced order model follows directly from the results of Pernebo and Silverman [3]. It is also shown that the reduced order model is minimal, in the controllability/observability sense. The relevance of this notion of minimality to stochastic minimality is made clear.     

Integrating and automating analysis and optimization

The development of an interface coupling program on personal computers for an analysis software system such as ANSYS, SAP, etc. and an optimization software system, MOST, is presented. By controlling and directing the communications the interface coupler integrates the two programs while retaining their versatility and interactive features. The integrated system is used to solve a numerical example of active noise control for a three-dimensional enclosure, in which an energy density level of control points is minimized by adding the sound source to cancel the unwanted noise. The interface coupling program automates with relatively low cost the iterative process for designing an engineering system, remaining flexible in acoustical modelling and efficient in equation solving. Also, the coupling interface is developed in a general-purpose way so that it can be expanded easily to integrate more analysis software packages of different kinds.