基于红外光学原理的便携式甲烷报警仪

提出了基于红外光学原理的便携式甲烷报警仪的设计方案,详细介绍了报警仪的硬件电路设计、软件设计、光学气室结构、外形结构设计及标定技术。该报警仪采用红外光源、高精度干涉滤光片一体化热释电探测器和单光束双波长技术,配合镀金膜气室实现对CH4等气体的实时检测,具有不易老化、响应快、灵敏度好、性能稳定、抗干扰能力强等优点。     

DXH-13.2/5便携式本质安全型电源

根据神华集团神东矿区的需求,设计了DXH-13.2/5便携式本质安全型电源,详细介绍了该电源的技术指标、结构组成及选型设计。实际应用表明,该电源可为煤矿井下便携式无源仪器仪表提供5 V本安电源,具有容量大、体积小、安全性高等特点。     

一类多输入多输出系统的冗余设计

分析了多输入多输出多变量系统在某环节失效时系统的整体性,给出了针对开环传递函数矩阵以及解耦后新对象均为本质稳定对象时系统的冗余设计方法.该方法有效解决了某环节失效后对系统稳定性的影响,实现了复杂系统的容错控制.仿真结果表明,该冗余设计方法可行,能够实现系统的容错控制.     

通用鱼雷模拟器适应性软件开发

提出一种具有动态重配置功能的分布式仿真系统成员适应性软件构架,开发通用鱼雷模拟器的适应性软件,它由接口通信层、需求管理层、适应性重配层以及功能实现层构成,给出软件开发所需的关键技术,包括动态重配引擎、可配置化构件模型与功能构件库。利用该通用鱼雷模拟器适应性软件进行实例测试,结果验证了其可行性与有效性。     

Robust actuator fault isolation and management in constrained uncertain parabolic PDE systems

This paper presents a methodology for the design of an integrated robust fault detection and isolation (FDI) and fault-tolerant control (FTC) architecture for distributed parameter systems modeled by nonlinear parabolic Partial Differential Equations (PDEs) with time-varying uncertain variables, actuator constraints and faults. The design is based on an approximate finite-dimensional system that captures the dominant dynamics of the PDE system. Initially, an invertible coordinate transformation-obtained through judicious actuator placement-is used to transform the approximate system into a form where the evolution of each state is excited directly by only one actuator. For each state, a robustly stabilizing bounded feedback controller that achieves an arbitrary degree of asymptotic attenuation of the effect of uncertainty is then synthesized and its constrained stability region is explicitly characterized in terms of the constraints, the actuator locations and the size of the uncertainty. A key idea in the controller synthesis is to shape the fault-free closed-loop response of each state in a prescribed fashion that facilitates the derivation of (1) dedicated FDI residuals and thresholds for each actuator, and (2) an explicit characterization of the state-space regions where FDI can be performed under uncertainty and constraints. A switching law is then derived to orchestrate actuator reconfiguration in a way that preserves robust closed-loop stability following FDI. Precise FDI rules and control reconfiguration criteria that account for model reduction errors are derived for the implementation of the FDI-FTC structure on the distributed parameter system. Finally, the results are demonstrated using a tubular reactor example.     

便携式汽车发动机检测装置的设计

本设计是以SEP4020为控制芯片,以μC/OS-II为实时操作系统来管理各个任务,移入了μC/GUI来完成TFT彩色液晶屏的操作,加入FAT32文件系统来对SD卡的数据存储功能进行操作,以TLC2543作为数据采集模块的多通道便携式发动机检测装置.实现了数据的实时采集,数据的显示和存储功能.该设计具有结构简单,易于实现,操作方便,效率高,实时性强,移动和通用性好的特点.     

Tradeoffs in process strategy games with application in the WDM reconfiguration problem

We consider a variant of the graph searching games that models the routing reconfiguration problem in WDM networks. In the digraph processing game, a team of agents aims at processing, or clearing, the vertices of a digraph D. We are interested in two different measures: (1) the total number of agents used, and (2) the total number of vertices occupied by an agent during the processing of D. These measures, respectively, correspond to the maximum number of simultaneous connections interrupted and to the total number of interruptions during a routing reconfiguration in a WDM network.Previous works have studied the problem of independently minimizing each of these parameters. In particular, the corresponding minimization problems are APX-hard, and the first one is known not to be in APX. In this paper, we give several complexity results and study tradeoffs between these conflicting objectives. In particular, we show that minimizing one of these parameters while the other is constrained is NP-complete. Then, we prove that there exist some digraphs for which minimizing one of these objectives arbitrarily impairs the quality of the solution for the other one. We show that such bad tradeoffs may happen even for a basic class of digraphs. On the other hand, we exhibit classes of graphs for which good tradeoffs can be achieved. We finally detail the relationship between this game and the routing reconfiguration problem. In particular, we prove that any instance of the processing game, i.e. any digraph, corresponds to an instance of the routing reconfiguration problem.     

基于FPGA的便携式故障录波仪研究与实现

介绍了一种以FPGA为设计核心的便携式故障录波仪,装置采用单一FGPA芯片的内嵌CPU核完成主控功能,并通过对人机交互和通信等电路的扩展,实现了高速高精度的故障数据的采集和传输。该装置体积小,重量轻且集成度高。由于其便携性,适用于电力低压系统以及大型故障录波装置安装不便的地点的故障信号的录波。     

可重构系统中基于空间邻接度的实时任务放置算法*

本文提出了一种基于三维空间邻接度的放置算法,该算法将硬件任务按照长、宽及调度时间构成一个三维资源模型,将每个硬件任务看成是一个空间块。首先对可重构资源进行编码,到达的任务总是通过某个顶点依附另一个任务的边界被放置,确定候选的放置顶点;然后以到达任务与已放置在三维空间的邻接度为代价函数,选择代价函数值最大的顶点放置任务,从而使得到达任务与已放置任务在三维空间接触的邻接面最大。可使任务安排得更紧凑,减小对系统资源的浪费,提高芯片利用率。     

基于LPC2294的便携式汽车车轮测量仪的开发

针对汽车车轮产品开发和车轮维修等场合的需要,开发了便携式汽车车轮测量仪,测量仪以LPC2294为微控制器,uC/OS-Ⅱ为操作系统,MiniGui为图形界面系统,运用位移传感器和编码器,能完成车轮的跳动、压配偏距测量和谐波分析,能储存100个车轮的测量数据,适用于多品种汽车车轮的测量,系统采用模块化设计,便于移动和携带,功能强大,具有广阔的应用前景。