Real-Time Monitoring System for Rotor Temperature of a Large Turbogenerator Based on SmartMesh IP Wireless Network Communication Technology

In this study,a real-time rotor temperature monitoring system for large turbogenerators using SmartMesh IP wireless network communication technology was designed and tested.The system is capable of providing comprehensive,accurate,continuous,and reliable real-time temperature monitoring for turbogenerators.Additionally,it has demonstrated satisfactory results in a real-time monitoring test of the rotor temperature of various famous large-scale turbogenerators and giant nuclear power half-speed turbogenerators designed and manufactured in China.The development and application of this wireless temperature measurement system would aid in improving the intelligent operation quality,safety,and stability of China’s large turbine generators and even the entire power system.

A Wireless Solution for Train Switchgear Contact Temperature Monitoring and Alarming System Based on Wireless Communication Technology

We present a temperature monitoring and warning system, which is based on wireless communi- cation technology and applied in train switchgear in this paper. The system is consists of three parts, including wireless temperature detection module, inter-vehicle transmission networks module and?remote monitoring server. The switchgear contact temperature data are collected via the wireless temperature detection module and exchanged in inter-vehicle wireless networking by Zigbee modules. Then the temperature of train switchgear cabinets can be monitored remotely through the GPRS wireless communication.

Serial Communications Programming in Windows95 with API Functions

This paper introduces the usage of these functions. It presents the technique of how to program with them to perform the serial communications between a computer and other digital devices by the serial porst in Windows95. The related sample codes of the applications of this technique written in C++ programming language are also given. This technique is applied successfully to receive the data of the radio noise from a frequency monitor.

The Serial Communication Based on Multithreading Technique of Windows

Present a kind of method which is used to communicate between serial serial port and peripheral equipment dynamicly and real-time using multithreading technique based on the basic principle of communication and multitasking mechanism in the circumstance of Windows. This method resolves the question of Real-time answering in the serial communication validly, reduces losing rate of data and improves reliability of system. This article presents a general method used in the serial communication which is practical.

The Establishment of a New Air Health Index Integrating the Mortality Risks Due to Ambient Air Pollution and Non-Optimum Temperature

A composite Air Health Index(AHI)is helpful for separately emphasizing the health risks of multiple stimuli and communicating the overall risks of an adverse atmospheric environment to the public.We aimed to establish a new AHI by integrating daily mortality risks due to air pollution with those due to non-optimum temperature in China.Based on the exposure-response(E-R)coefficients obtained from time-series models,the new AHI was constructed as the sum of excess mortality risk associated with air pollutants and non-optimum temperature in 272 Chinese cities from 2013 to 2015.We examined the association between the“total AHI”(based on total mortality)and total mortality,and further compared the ability of the“total AHI”to predict specific cardiopulmonary mortality with that of“specific AHIs”(based on specific mortalities).On average,air pollution and non-optimum temperature were associated with 28.23%of daily excess mortality,of which 23.47%was associated with non-optimum temperature while the remainder was associated with fine particulate matter(PM2.5)(1.12%),NO2(2.29%,),and O3(2.29%).The new AHI uses a 10-point scale and shows an average across all 272 cities of 6 points.The E-R curve for AHI and mortality is approximately linear,without any thresholds.Each one unit increase in“total AHI”is associated with a 0.84%increase in all-cause mortality and 1.01%,0.98%,1.02%,1.66%,and 1.71%increases in cardiovascular disease,coronary heart disease,stroke,respiratory diseases,and chronic obstructive pulmonary disease mortality,respectively.Cause-specific mortality risk estimates using the“total AHI”are similar to those predicted by“specific AHIs.”In conclusion,the“total AHI”proposed herein could be a promising tool for communicating health risks related to exposure to the ambient environment to the public.

A communication-aware scheduling algorithm for heterogeneous systems

Previous work mostly employs an ideal system model that assumes fully connected processors and concurrent communication, which leads to inaccurate and inegicient schedule results. In this paper, a new scheduling model which integrates the communication awareness was proposed. Then, a novel scheduling algorithm based on list heuristic was put forward for the new model, which can produce optimal schedule by serializing the communications edges. Experimental results show that the accuracy and efficiency of the new model and algorithm are significantly improved.

Design of Distributed Temperature Measurement System for Switchgear

This paper develops a novel distributed temperature measurement system based on DSP and DS18B20 digital thermometer. The real-time temperature of each node in the switchgear is obtained by several DS18B20s which are connected on the 1-wire bus together. RS-485 master-slave communication protocol is used to centralize monitoring temperatures of several switchgear cabinets. The system also has the function of temperature alarm. The operation of simulation experiment has showed that the system is able to complete monitoring real-time temperatures in high voltage switchgear.

Wireless sensing system for environmental humidity and temperature monitoring

Aiming at the actual demand for monitoring environmental information,a wireless sensing system for temperature and relative humidity(RH)monitoring based on radio frequency(RF)technology and mobile network was designed.This paper introduces the architecture of the system.The system uses AVR micro controller unit(MCU),KYL-1020U RF module and SHT71 to complete real-time temperature and humidity monitoring,and uses SIM900A module to realize remote alarming and monitoring with short message system(SMS)through global system for mobile communication(GSM).Experimental results show that the designed system has good stability of measurement and real-time performance,and it can be used in some small temperature and humidity monitoring occasions.

Application of Serial Port in Industrial Computer System

In an industrial computer control system, if a communication with a single chip computer built with the aid of serial port I/O ports can be got easily to connect with equipment. Meanwhile, the system reliability would be improved and the system cost would be reduced.To save ±15 V power supply and electrical level convert circuit,the author provide a simple interface circuit and operational procedure between PC and the single chip computer in this paper. The application of multithread is introduced and the advantages of data acquisition and processing with multithread are also analyzed.

Optimization of Serial Port of General Flex Pendant for Industrial Robot

In order to further improve the serial ports communication mode of the general Flex Pendant for industrial robot,a multiple serial communication mode is put forward. It is used to meet the stability of data transmission,transmission distance,transmission speed,anti-interference and cost-effective. Using ADUM1201 single direction dual channel digital isolator,two pieces of MAX13487 E and a piece of MAX3232 chip to transmit data and files, and to control chip’ s electrical level. Selecting the RS232, RS422 and RS485 communication mode,the serial ports of the general Flex Pendant of industrial robot is optimized.

一种基于串行通信的低成本集中式温控系统设计

以某覆铜板生产线的技术改造项目为背景,介绍了如何应用三菱PLC的串行通信技术实现在覆铜板生产线中对温度的集中式监控与管理。所设计的系统可以较低成本将温度控制精度提升至±0.1℃,并优化了生产流程,提高整体生产效率。

600 MW直接空冷系统智能在线测温系统设计

目前直接空冷系统运行中存在的一些问题亟需解决,如横向大风对空冷系统的影响;热风回流现象对空冷系统的影响;空冷管束的脏污情况对空冷系统性能的影响;冬季空冷系统管束的防冻及经济运行等问题。当前各发电厂对节能工作非常重视,其中空冷系统存在很大的节能空间,因此需要开发一套可进行大面积管束测温的系统来实时监测管束温度情况,根据管束温度分析空冷系统的运行状态,对于运行过程中出现的异常情况可以及时预警并提前动作,为空冷系统安全经济及节能运行提供保障和手段。基于空冷系统实际运行需求及目前已有的在线测温设备情况,采用DS18B20测温传感器的方案,开发一种成本低、可大面积布置、易于安装和更换的智能在线测温系统。该系统不仅具备数据分析、报警、趋势显示等功能,还能与主机DCS系统联动达到整体控制功能和效果。介绍了系统整体方案,简单论述设备间的通信机制及软件组态编程。

基于时间序列神经网络的气象预测研究

月平均气温是气象的主要特性参数 ,也是影响气候变化的重要因素 .文中配合实例介绍了一种基于时间序列的人工神经网络学习算法的流程 ,给出了该算法的实验结果并对不同情况下的结果作了比较 ,同时就在实现该算法的过程中所出现的问题以及解决方案进行了阐述 .最后提出了将

CC2430芯片和单片机的暖气控制系统设计与实现

针对现有公共建筑采暖系统存在能源浪费以及不能有效节约能源的问题,设计了基于STC10L08XE单片机和CC2430芯片的暖气控制系统。系统通过采集室内温度,自动调节暖气流量,以实现节能的目的;同时利用CC2430芯片完成温度控制主板与手持终端的无线通信。介绍了系统各个模块的软硬件设计,并给出了部分原理图和程序设计流程图。试用结果表明,系统运行稳定,节能效果明显。

复合模糊串级系统在火电厂过热汽温控制中的应用

在对火电厂过热汽温控制对象特点分析基础上 ,保留串级控制抗内扰的性能 ,结合模糊控制动态特性好的特点 ,提出了一种复合模糊串级控制设计。仿真结果表明 ,用这种方法建立的过热汽温控制系统具有较好的控制品质和抗干扰能力。

基于DS18B20数字温度传感器的温室环境采集系统设计及应用

通过系统的分析和总结,得出温室大气温度信号的采集传感器件所需的测量程小,精确度不高,抗干扰性较强,经济性较好的结论。并以此为依据,选用DS18B20数字温度传感器为温度采集器件,进行了温度采集系统的硬件和软件设计,实现了采集系统分布式采集温度信号的功能。同时,通过串行总线完成了采集系统与上位计算机的连接,实现了采集系统的网络化监控功能。

基于MS5534B的气压高度计系统的设计

采用Intersema公司基于MEMS的数字压力传感器MS5534B,利用海拔高度与气压和温度的关系,设计并制作了一个微型气压高度计。利用MSP430F449的I/O口模拟同步串行外设接口(SPI),实现了MSP430F449从数字压力测量模块MS5534B读取温度和气压数据的功能,经过相关的计算处理得到实际高度值,在液晶显示屏上实时显示温度和高度,并通过RS232通信接口把数据发回至上位机。设计的气压高度计样机具有质量小、功耗低、精度高等优点,经过实验测定,在标准大气压环境中其相对高度测量的平均标准偏差为0.2m,线性度为0.9999。

温度监测系统中无线通讯部分的设计与实现

提出了一种新型基于无线通讯的高压断路器机构箱温度在线监测系统的设计。设计中选用了工作稳定可靠的无线通讯芯片和先进的温度传感器,工作子站选用MSP430F149处理芯片,便于现场的实时温度采集。上位机监控程序采用C++Builder程序进行编写,采用了功能强大的串口通讯控件TYbCommDevice。笔者描述了该系统的软硬件在无线通讯方面的设计,并经过实际的运行检验,证明系统运行正常,各项指标达到了工业要求。

真空断路器触头温度在线监测系统研究

介绍一种利用光纤温度传感器测量真空断路器触头温度的在线监测系统。针对电气化铁道中广泛应用的真空断路器特点 ,采用单片机、I2 C母线、串行数据传送等技术 ,设计了结构简单、新颖、具有良好人机界面的在线监测系统 ,并进行了实验。

温度对煤系泥岩力学特征影响的试验研究

利用RMT-150B岩石力学试验系统和GD-65/150高低温环境箱,对经历不同温度后煤系泥岩的力学特性进行试验研究,分析不同温度下煤系泥岩的应力-应变全过程曲线、峰值应力、峰值应变、弹性模量、变形模量以及泊松比受温度的影响。研究结果表明,不同温度下泥岩的力学特性有差异。随温度的升高,其峰值应力、峰值应变有不同程度的降低,其峰值应力从25℃时的9.153 MPa下降到55℃时的8.271 MPa,降幅为9.6%;峰值应变从25℃时的11.002×10-3下降到55℃时的8.249×10-3,降幅达25.0%。弹性模量随温度的升高逐渐减小,变形模量随温度的升高而增大,泊松比随温度的升高逐渐减小,由此得到各参数变量随温度的变化关系。研究成果可为深井高温软岩巷道的围岩控制提供理论基础。