采样数据系统输出量的新计算方法

本文用新的原理推广了信号流图和梅逊公式在采样数据系统中的应用,提出了"新采样信 号流图",以及相应的计算单输入、单输出周期采样数据系统的采样输出、连续输出和广义采样 输出的新计算方法.根据新计算方法,可利用系统方块图一步构造出新采样信号流图,并可 直接计算出采样数据系统的三种输出量.这种方法比目前利用系统方块图构造"原始信号流 图","采样信号流图"和"复合信号流图"再进行计算的方法简单、方便,计算量亦大为减少.对 于一般采样数据系统,通过心算就能得到输出量结果.对于多速采样数据系统,只要将系统稍 加变换,新计算方法仍能适用. 本文还给出了计算多变量采样数据系统输出量的最优拓扑方法.     

一种程控变频电源GPIB接口的设计与实现

介绍一种基于FPGA的程控变频电源GPIB接口设计方法,采用VHDL语言在XC3S400芯片上实现专用接口芯片NAT7210的功能.介绍了程控变频电源控制电路和FPGA实现的功能块框图,并给出了讲者接口功能的状态转换图及其实现方法,最后介绍了在PIC24单片机上实现GPIB驱动的设计方法.     

GPS定位监视系统移动终端设计及实现

针对公务车辆监视需求,采用AVR单片机为控制核心,利用内嵌TCP/IP协议栈的GPRS模块为通信手段,通过GPS模块测量位置数据,设计开发了卫星定位监视系统移动终端。阐述了设计思路和软硬件设计思想,给出了原理框图及部分线路图。     

具有不稳定零极点对消的结构图等效问题

为进一步完善经典控制论中的结构图简化规则,深入研究具有不稳定零极点对消的结构图等效问题。指出复杂结构图等效后,如果其等效式与其他环节存在不稳定零极点对消,则对消后系统的性质将发生改变,此时应保持原结构图而不做进一步的简化,仿真示例验证这一结论。     

A Computer System Supporting Administrative Decision Making under the Conditions of Mixed Information for Systems of Ecological Monitoring of the Atmosphere

A mathematical model and a block diagram of a system for making administrative decisions in distributed monitoring systems under the conditions of mixed information are developed by methods of systems analysis. The structure of applied decision-making systems for supporting information systems of analysis and prediction of atmospheric air pollution is proposed.     

Robust stability of interconnected systems

The concept of generalized block diagonal dominance is used to extend a number of recently developed robust stability results for multivariable systems to large-scale interconnected systems.     

A simnet simulation model for estimating system reliability

A general SIMNET simulation model is developed for estimating system reliability. The input data to the model is comprised of the minimal cut sets of the block diagram representing the system. The time-to-failure of the (parallel-series) components may be descriebd by different distributions. The model can be readily extended to include repair and maintenance of the components.     

风电叶片智能高效便携式C扫描超声检测系统开发

针对传统超声A扫探伤风电叶片存在检测效率低、员工劳动强度大、仪器智能化不够等问题,开发了一套实时显示并保存当前位置信息、波形信息和C扫描彩图的超声扫查系统.给出了系统硬件框图、基于LabVIEW软件设计界面以及C扫描成像框图.分别制作了不同缺陷风电叶片主梁和腹板粘接模型,以模型背面左下角为探伤坐标原点,采用相同的扫查参数设置和速度,对系统进行了实验.实验结果表明,系统能够有效检测粘接区域缺陷的种类、轮廓和位置,且运行稳定可靠.     

与数据库相联的平衡表面图绘图软件

平衡表面图是作者近年提出的一种热化学数据图示方法,用于湿法冶金络合物体系矿物浸出或金属离子沉降的条件分析.本文提出一个与微机冶金热化学数据库相联的绘图软件,说明算法与绘图的基本原理及三维数组的生成方法.以铜-氯-水体系为例展示了绘图结果及其意义.     

基于Matlab的飞行控制系统辅助设计软件的开发

为了更有效率地分析与设计飞机飞行控制系统,开发了飞行控制系统辅助设计软件,给出了软件的结构框图,介绍了软件各部分的组成及功能,并对软件设计与开发中的关键技术进行了分析,介绍了具体的设计方案。以某型无人机的纵向飞行控制系统的设计为例,验证了此软件的有效性。     

竖井变形自动综合测量仪

介绍了竖井变形自动综合测量仪的设计原理和技术方案,给出了数据采集器硬件电路设计及其框图、计算机程序设计流程图。     

AM超外差收音机的设计与仿真

本文介绍了超外差收音机的基本原理,设计出了超外差收音机的系统框图,最后利用Systemview软件对其进行了仿真。设计方案可行,仿真结果正确,加深了对相关理论知识的学习和理解。     

Realtime high resolution data acquisition unit for an MC68000 system

The general procedure for data acquisition in digital signal processing systems is to acquire a block of data and then analyse it. In a single-processor system, a considerable amount of data can be lost because, while data is being analysed by the processor, it is not sampled from the A/D converter. A dual-tasking machine has therefore been developed for continuous data analysis. The design requirements of the system are discussed. A block diagram of the system is presented, and the analogue-to-digital converter board is described in detail. The memory interchange board is also considered in depth.     

一种图形交互式CACSD软件

本文介绍作者在微型计算机PC-8001及IBM-PC上研制的直接图形交互式CACSD软 件--GISP,包括系统功能、模型的描述及基本功能等框图、塔斯汀算法及其离散化方程、 GISP的运行、结构化程序设计及软硬件支持等,最后介绍了应用实例.     

An efficient two-staged approach for generating block layouts

Multidimensional scaling (MDS) is a useful mathematical tool that enables the analysis of data in areas where organized concepts and underlying dimensions are not well developed. In this paper, MDS algorithms are used as a dimension reduction tool which arranges facilities in a two-dimensional space while preserving the adjacency relationship between facilities. The output of MDS is a scatter diagram and is in turn used as the input or location references for developing into the final block layout. The bay structures of layout are considered where the given floor space is first partitioned horizontally or vertically into bays, which are subsequently partitioned into the blocks. Rotating the scatter diagram about the origin results in different layouts in the bay structure. A simulated annealing approach is adopted to rotate the scatter diagram so that the total cost of traveling between facilities and shape violation in the final layout is minimized.Scope and purposeThis paper discusses the application of multidimensional scaling (MDS) and simulated annealing (SA) to efficiently design facility layout. MDS is a powerful mathematical tool widely used in psychometry as well as in marketing research. By using MDS to generate a reference scatter diagram, a layout can subsequently be developed. The SA algorithm is then applied to rotate the scatter diagram from MDS so that a layout with the total cost of traveling between facilities being minimized can be obtained.     

S7-300可编程控制器和组态王软件在游泳池水处理系统中的应用

本文介绍了游泳池循环水系统的组成及水处理的工艺过程,给出了采用S7-300可编程控制器进行过程控制的系统配置,介绍了主程序和反冲洗程序的简要框图,最后介绍了用"组态王"作上位机监控软件的监控画面的编程情况。     

基于Popov定理的输入非线性广义预测控制系统的稳定性分析

对存在输入饱和约束和输入可逆静态非线性的系统,采用两步法广义预测控制策略. 首先用线性广义预测控制策略得到中间变量,代表期望的控制作用,然后用解方程方法补偿可逆 静态非线性并用解饱和方法满足饱和约束,得到实际的控制作用.两步法计算简单,特别适用于 快速控制的场合.将该控制系统闭环结构转化为静态非线性增益反馈结构,利用Popov定理分 析了该系统的闭环稳定性,得到了稳定的充分条件,并具体给出了有效的控制器参数确定算法使 得稳定性结论具备实用的价值.给出了算例验证了稳定条件.     

A voronoi diagram‐visibility graph‐potential field compound algorithm for robot path planning

Numerous methods have been developed to solve the motion planning problem, among which the Voronoi diagram, visibility graph, and potential fields are well‐known techniques. In this paper, a new path planning algorithm is presented where these three methods are integrated for the first time in a single architecture. After constructing the generalized Voronoi diagram of C‐space, we introduce a novel procedure for its abstraction, producing a pruned generalized Voronoi diagram. A broad freeway net is then developed through a new α‐MID (maximal inscribed discs) concept. A potential function is assigned to the net to form an obstacle‐free network of valleys. Afterwards we take advantage of a bidirectional search, where the visibility graph and potential field modules execute alternately from both start and goal configurations. A steepest descent mildest ascent search technique is used for local planning and avoiding local minima. The algorithm provides a parametric tradeoff between safest and shortest paths and generally yields shorter paths than the Voronoi and potential field methods, and faster than the visibility graph. It also performs well in complicated environments. © 2004 Wiley Periodicals, Inc.     

A novel structural modeling and analysis of VLSI interconnect with an RLC tree network system using a BG/SEBD approach

A practical and effective novel graphical structural modeling and analysis approach is presented.This approach is used for solving the state interactions modeling problem caused by the model approximations in VLSI interconnect for RLC tree network systems.The bond graph (BG) energy model with a simulink energy-based block diagram (SEBD) algorithm is developed.The dynamic behaviors of an example of VLSI interconnect with a 20th-order RLC tree are presented.Methods of sequent structuring and the delineation o...