基于C8051F120的可燃气体无线报警系统设计

介绍一种基于Silicon Lab公司的C8051F120单片机设计的可燃气体无线报警仪,并阐述了报警平台的软硬件设计。无线报警系统由报警器和报警平台两部分组成,两者通过射频芯片SI4432实现数据的无线传输,并由报警平台上的GR64模块通过GSM网络以SMS方式实现远程报警功能。测试结果表明:该系统性能稳定、抗干扰能力强,具有很高的应用价值。     

NRF905无线收发模块在风电叶片声发射检测中的应用

针对有线设备检测旋转叶片时的缠线问题,提出运用无线技术对旋转叶片进行状态监测。设计一种基于叶片声发射信号的无线检测系统。采用模块化的设计思想,声发射传感器选用北京声华SR150M检测叶片声发射信号,控制单元选用STC系列12C5A60S2单片机实现数据存储和控制收发,无线收发模块选用NRF905芯片,上位机使用VB设计,实现数据接收处理。测试结果表明,该系统数据检测和传输处理可靠,能够实现叶片的状态监测;且软件具有可移植性,可为旋转物件状态监测提供方法。     

基于单片机的电能计量插座设计

介绍了一种具有电参数计量功能的基于单片机的电能计量插座。系统以AT89S51单片机为核心,计量芯片CS5460A通过采样电路完成对电能的测量,并把数据传送给单片机进行计算显示。nRF24L01+无线模块实现主机无线数据的采集和远端监控。X5045存储各项校准值和电量值,实现系统的自动校准和断电后电能值保留的功能。系统由程序实现报警和继电控制。     

国外专利信息

<正>自动化电镀系统本专利介绍了一套以计算机为控制核心的自动化电镀系统。其组成包括一级无线收发终端、二级无线收发终端、地址程序块、数据存储器、电流调控模块、驱动电机、提升电机、振动电机和电磁铁等。基于该系统,依据实时反馈的数据信息,可实现电镀过程的自动化控制。     

基于ZigBee的工控网数据采集传输系统设计

介绍ZigBee技术和无线数据采集传输系统的拓扑结构,在深入分析ZigBee协议和工业控制网络结构的基础上,结合实际应用环境的特点,提出ZigBee无线终端设备接入工业控制网络的协议模型。采用基于Zig-Bee技术的CC2420芯片,探讨ZigBee无线终端和ZigBee无线网关的设计实现方法。测试结果表明,系统运行稳定、可靠。     

一体化无线示功仪的研制与应用

本文介绍一种新型抽油机井一体化无线示功仪的研制与应用技术。该仪器遵循高性能、低功耗的电路设计理念,以32位微处理器为核心,集数据采集、存储、无线传输于一体的功图采集仪。为提高油田抽油机井功图采集精度、实现远程操控和仪器便携实用提供了一个实用型方案,并通过现场测试样机的数据采集效果和工作稳定性。     

负脉冲LWD常见问题及分析处理

负脉冲LWD无线随钻测井系统在我单位应用已有多年,本文针对LWD使用过程中发生的一些问题进行分析及处理,对负脉冲LWD的今后使用有一定的借鉴作用。     

MOCON新推出氧气渗透快速测试系统

美国MOCON公司最新推出了“氧气渗透率快速测试系统”（OxyTraQ Pemeation System，由北京丹贝尔仪器有限公司代理），可用于坚硬包装和容器的氧气阻隔性测试，以及脱氧剂等的测试。该系统具有6个工位，每个工位都有1个独立的传感器，方便软件系统跟踪每个工位的实时数据，并进行数据的存储和输出。     

基于单片机的油井封隔器管柱载荷测试仪

为证明油井封隔器管柱力学理论的正确性并测试油井管柱封隔器的轴向载荷、径向载荷及扭矩等参数,设计了基于应变检测技术的存储式油井封隔器管柱载荷测试仪。介绍了系统中各模块的基本原理和整体工作流程。测试仪由井下数据采集系统和地面上位机软件两大部分组成。机械测试短接测井后起出,通过地面数据回放分析系统即可得到油井管柱封隔器承受载荷的数据。完成方案设计后,在实验室加工了测试样机并进行了室内测试,系统整体达到了预期指标,验证了方案的可行性。     

无线应变测试系统在钻机井架检测中的应用

应力测试是石油钻机井架检测的主要项目之一,传统的应变测试系统缺点是需要大量布线,效率低下。针对传统有线应变测试系统存在的问题,设计了基于无线网络的钻机井架应变测试系统。这种无线测试系统具有测试精度高、稳定性强、高效率、高可靠性、低功耗等优点,适合钻机井架检测中应用。     

高速单向通信设备的设计与实现

设计了一款高速单向通信设备,借助移动存储介质将数据从普通计算机单向安全地传输到对信息敏感的计算机中.该通信设备由ARM、FPGA、并/串转换芯片及电光/光电单向转换系统等组成.ARM负责与计算机和移动存储介质的数据交互及传输信号控制,FPGA负责数据缓存、8b/10b编解码及中断控制等,电光/光电单向转换系统则共同保证了数据传输的单向性.经实际性能测试,设备通信的最高速率可达到58Mb/s,同时具有绝对可靠的数据单向通信功能,具有广阔的应用前景.     

CMAC—PID复合控制在焦炉加热中的应用

针对焦炉加热的大惯性、大滞后和时变性的特点,采用小脑神经网络CMAC和PID复合控制相结合,将此方法应用在焦炉加热中,并进行了仿真研究。仿真结果表明,这种方案对控制系统具有较强的鲁棒性和良好的调节性能,提高了系统的动静态性能指标。     

基于分时电价的区域管网系统储能应用研究

区域供冷系统主要分为源、网、用户三部分，其中管网不仅可以作为能量输送环节，还可以实现能量的储存，因此可以利用管网的储能效应实现制冷站与电网的互动。以广东惠州某园区制冷站为例，基于Modelica语言在Dymola平台上搭建了区域供冷系统。基于分时电价，应用管网的储热与延迟特性，提出三种控制策略以探讨热网在电力响应中的应用。仿真结果显示，在案例中管网储热维持室温的效果为0.31 h，利用管网储热能够使供冷系统节省6.4%的电耗和6.7%的电费，可见管网的虚拟储能效应是制冷站参与电网需求响应的重要资源。     

Zur Verfestigung von Schüttgütern – Mikroprozesse und Kinetikmodelle

Storage tanks are important elements of a self-operating closed processing system. The reliability and availability of storage equipment essentially depends on the flow behaviour of particulate solids in storage containers. A wide residence time distribution (i.e. too long a storage time at rest) in silos, bunkers or transportation containers, respectively, can lead to the hazardous problem of so-called “time consolidation” of particulate solids. During this hardening process, solid bridges are forming with resulting solidification and solid properties of bulk material. In principle, there are four main physico-chemical effects in bulk materials storing and handling which can produce solid briding between the particle contacts due to crystallisation, chemical reactions, solidification of high-viscous bonding agents and sintering. Generally, new adhesion force based models are presented to describe the consolidation kinetics of particulate solids. Preliminary solutions of kinetic model equations are discussed and compared with new test results and practical conclusions are drawn concerning the reliable processing, storage and transportation of bulk materials.     

稀盐酸储槽抽裂事故的分析

分析了盐酸脱吸工序中稀盐酸储槽抽裂事故产生的原因；通过稀盐酸储槽的压力式液位计DCS历史曲线记录来间接分析稀盐酸储槽内压力变化情况，剖析负压的形成过程。结果表明：脱吸塔产生较大的负压是因为系统急停、温度下降后在略低于盐酸溶液恒沸点时发生冷凝相变而引起的。     

UNBIASED IDENTIFICATION OF CONTINUOUS-TIME PARAMETRIC MODELS USING A TIME-WEIGHTED INTEGRAL TRANSFORM

A time-weighted integral transform is presented to identify a continuous SISO or MIMO parametric model based on a single dynamic test under open-loop or closed-loop operation. Moving-horizon algorithms are proposed to obtain unbiased estimates of the model parameters. The off-line algorithm in a least-squares form and the on-line algorithm in a recursive form are provided. An effective technique based on pattern recognition is also developed to determine the system order and time delay from observed data in a simple manner. Furthermore, the proposed method can be easily applied as a model reduction technique that results in an ideal model with delay for any specified order.     

Unbiased identification of continuous-time parametric models using a time-weighted integral transform

A time-weighted integral transform is presented to identify a continuous SISO or MIMO parametric model based on a single dynamic test under open-loop or closed-loop operation. Moving-horizon algorithms are proposed to obtain unbiased estimates of the model parameters. The off-line algorithm in a least-squares form and the on-line algorithm in a recursive form are provided. An effective technique based on pattern recognition is also developed to determine the system order and time delay from observed data in a simple manner. Furthermore, the proposed method can be easily applied as a model reduction technique that results in an ideal model with delay for any specified order.     

FEEDBACK LINEARIZATION DESIGNS FOR UNCERTAIN NONLINEAR TIME-DELAY PROCESSES: A COMPARATIVE STUDY

This work concerns the phenomena in which the feedback linearization control is applied to uncertain nonlinear time-delay processes. Under the I/O linearization algorithm, both nonlinear controllers are used to stabilize the closed-loop system with transformed delay inputs. When the effect of input perturbations can converge to zero or asymptotically vanish, these nonlinear feedback designs with only an adjustable parameter can directly improve the tracking performance. The simple linearizing controller can directly regulate the system output at unstable operating point. Combined with deadtime compensation the nonlinear predictive controller with the aid of appropriate state prediction is valid for the real process in the presence of large time delay. Finally, via computer simulation and test of control ability of both feedback control designs the useful comparative results are presented.     

FEEDBACK LINEARIZATION DESIGNS FOR UNCERTAIN NONLINEAR TIME-DELAY PROCESSES: A COMPARATIVE STUDY

This work concerns the phenomena in which the feedback linearization control is applied to uncertain nonlinear time-delay processes. Under the I/O linearization algorithm, both nonlinear controllers are used to stabilize the closed-loop system with transformed delay inputs. When the effect of input perturbations can converge to zero or asymptotically vanish, these nonlinear feedback designs with only an adjustable parameter can directly improve the tracking performance. The simple linearizing controller can directly regulate the system output at unstable operating point. Combined with deadtime compensation the nonlinear predictive controller with the aid of appropriate state prediction is valid for the real process in the presence of large time delay. Finally, via computer simulation and test of control ability of both feedback control designs the useful comparative results are presented.     

基于SD卡的数据存储系统设计

设计了基于SD卡的数据存储系统,在主控芯片中内嵌了Fat32文件系统的基本文件操作函数,满足了数据采集系统存储量大、传输速率快的要求。实验测试表明:存储系统稳定、可靠,且达到数据传输的要求。