Revamping design of an EAF automatic temperature measurement and sampling robot

The function,features,and architecture of a robot that performs automatic temperature measurement and sampling applied on a 150-t AC electric arc furnace(EAF)production line of Baosteel were presented,and the key points of design and revamping experience on the site layout,device protection,lance tool,probe container,measuring position control,and system safety were summarized.Furthermore,a valuable reference for the application of automatic temperature measuring and sampling robots in EAF steelmaking plants will be provided.

Effects of seasonal air temperature variation on airflow and surrounding rock temperature of mines

In underground mines, high air temperatures in the summer months lead to an increase in inlet airflow temperatures. This leads to seasonal thermal pollution in the mines. This paper examines the dynamics and effects of seasonal variation in surface air temperatures and surrounding rock temperatures in deep coal mines. It also examines temperature variations in the main ventilation circuit, working face, and surrounding rock. The study results revealed that airflow temperatures were significantly affected by seasonal air temperature variations. The greater the distance was between the inlet and the wellhead of the ventilation shaft, the less the effect was on temperature. Moreover, slight temperature variations (1.0-3.0 ℃) were observed between various points on the return route during the summer months. Airflow temperatures along the airflow inlet to the return route of the working face first decreased, but then increased. The temperature field of the surrounding rock increased gradually with increased distance between the mine roadway and inlet, with recorded rock temperatures as high as 40.53 ℃. The radius of the heat-adjusting layer was between 28 and 33 m.

Optical fiber FBG linear sensing systems for the on-line monitoring of airborne high temperature air duct leakage

Electrical sensing systems, such as those involving eutectic salt, are mostly used in connection to leakage from existing airborne high-temperature air-conducting pipelines. Such complex structured systems are susceptible to external interferences and, thus, cannot meet the increasingly strict monitoring needs of a complex air-conducting pipeline system of an aircraft. In view of this point, this paper studies an alternative sensor system based on a dense array fiber grating. To obtain a compact and light-weight airborne signal processing system, a field programmable gate array is used as the main control core that controls the output of the light source. The functions of pulse modulation, analog-to-digital conversion,data buffering and transmission are integrated into a single system, while the linear sensing monitoring is obtained by detecting the time-division and wavelength-division wavelength drift signals of the fiber Bragg grating array. Our experiments show that the spatial resolution of the linear sensing system approaches 5 cm, the temperature measurement accuracy reaches 2 ℃, the temperature measurement range is between 0–250 ℃, and the response time is within 4 s. Compared with the existing electrical monitoring systems, various monitoring indicators have been greatly improved and have broad application prospects.

The Design of Fiber Bragg Grating Temperature Measurement System Based on Labview

The paper made a research on the fiber Bragg grating sensor demodulation system, which was based on virtual instrument labview and it developed a friendly upper monitor software. Based on the LM algorithm, the software realized rapid and accurate spectral data fitting, improving dynamic characteristics and measuring precision of the system. Depending on different fiber Bragg grating sensors, it can realize flexible calibration. It has the functions of collection, display and data storage, which can flexibly design alarm threshold according to the practical application. The fiber Bragg grating sensors can be identified by the software so that the distributed network, with large capacity optical fiber sensing, can be achieved.

Research on geo-electrical resistivity observation system specially used for earthquake monitoring in China

This paper deals with the design and development of the observational system of geo-electrical resistivity on the basis of the demands for exploring the temporal variations of electrical properties of Earth media in the fixed points of the networks, which would be associated with the earthquake preparation. The observation system is characterized by the high accuracy in measurement, long term stability in operation and high level of rejection to the environmental interference. It consists of three main parts, configuration system measurement system, the calibration and inspection system.

New “Intellectual Networks” (Smart Grid) for Detecting Electrical Equipment Faults, Defects and Weaknesses

The most important elements of “intellectual networks” (Smart Grid) are the systems of monitoring the parameters of electrical equipment. Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings. This paper presents an application’s experience of LVI-testing, some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control results of electrical equipment. The LVI method and short-circuit inductive reactance measurements are sensitive for detecting such faults as radial, axial winding deformations, a twisting of low-voltage or regulating winding, a losing of winding’s pressing and others.

基于北斗测速的电驱式小麦播种机监控系统设计与试验

针对当前小麦播种机智能化程度低、播种作业时种子漏播肥料堵塞导致缺苗断垄现象产生的问题,设计了一款基于北斗测速的电驱式小麦播种机监控系统。通过电容检测可以实时监测小麦种子漏播情况,通过光电检测可以实时监控排肥管内肥料堵塞情况;北斗卫星实时定位并计算出播种机的前进速度,控制器根据播种机前进速度实时调节播种施肥电机转速,实现种子漏播、肥料堵塞报警和精量播种施肥的目的。在田间试验中,装载监控系统的播种机各项性能表现良好,漏播检测准确率91%以上,肥料堵塞检测准确率95%以上,播种合格率平均值大于94.6%,漏播指数小于2.8%,重播指数小于3%,均匀度变异系数小于3.5%,能够满足小麦精量播种的要求。

基于Android应用的智能计量插座设计

智能家居是物联网的一个重要应用领域,而智能计量插座因其可以有效监控用电量,已成为智能家居的重要组成部分。本文采用处理器STM8L152和计量芯片ATT7039AU,实现对用户插座电压、电流、功率、用电量等参数的有效监控,并通过自带的Wi Fi模块,实现对插座的远程智能控制、数据采集、能耗管理等功能,从而达到减少家居用电能耗的目的。

Research and Application of 40 kW Electric Servo System on Gravity-1 Launch Vehicle

This article introduces the 40 kW electric servo system used by Gravity-1 strap-on launch vehicle, which mainly includes the composition, function and related equipment of the system. Aiming at the measurement deviation caused by the closed loop of resolver, a compensation algorithm is designed;aiming at the monitoring of the output power of the thermal battery, an algorithm without sensory monitoring the bus current is designed. In the end, the effectiveness of the two algorithms was verified by testing.

The Design Liquid-level Monitoring System of Adopting the Ultrasonic Sensing Technology

Utilizing the technology of Ultrasonic wave,relevant test arithmetic and the PC to carry on monitoring,controlling and cen-tralized management of the liquid-level in the liquid container. It can prevent from keeping in touch with the examined liquid,not only has increased the continuous working time of the system greatly,simplifying maintenance of the sensor conveniently,can also realize overhauling in producing and boost the productivity and management level. The working principle,hardware structure of the instrument and the design method are presented,and the selection of sensor and MCU is discussed in detail in this paper. MCU are used to control the emission and receiving. Then the liquid-level are calculated,which makes the design more intelligent.

电机转子温度监测方法研究现状及展望

随着高速电机的发展,转子的温度已成为电机设计和健康监测的重要指标,舰船电机的强电磁工作环境、狭小的气隙、较大的旋转离心力是转子温度监测面临的难题。文中针对电机转子温度的监测方法,主要包括电阻法、红外测温法、电子类传感器测温法、半导体温敏元件法和光纤光栅测温法,阐述了各方法的原理和特点,介绍了转子温度在线监测领域的研究现状和取得的主要成果,重点聚焦光纤布拉格光栅的应用和研究进展,分析总结了各方法的适用性和存在的主要问题,并展望了未来的技术路线和发展方向。

红外测温技术在换流阀温度监测中的应用

随着工业自动化的发展,高效且准确的设备监控技术逐渐受到重视。在电力系统中,换流阀作为关键组件,其温度监测对于系统的稳定运行至关重要。基于此,文章探讨红外测温技术在换流阀温度监测中的应用及其优势。一方面,分析红外测温技术的原理和不同应用场景的需求;另一方面,展示红外测温技术在实际工业环境中的适用性和高效性。研究结果表明,应用红外测温技术能够更准确、实时地监测温度数据,对于预防设备故障和优化维护计划具有重要价值。

集成结温在线监测功能的IGBT智能驱动器

结温是表征功率器件寿命的重要参数,对功率器件结温进行监测具有重要意义。基于热敏电参数法,选取对温度敏感的电参量饱和导通压降V_(CE(sat))作为研究对象,在IGBT驱动器中集成高精度结温参数测量电路,使系统可在线监测功率器件结温。同时为了得到更加精准的热-电参量对应关系,通过分段拟合的方式对IGBT模块在工作状态下结温与V_(CE(sat))的关系进行数学建模。在此基础上,还设计了相应的退饱和检测电路和分级驱动电路。经过实验验证,最终解决了传统结温测量方式工程应用性差的问题,提高了参数采集精度,将热敏电参数的结温预测误差控制在±5℃以内。

基于老化补偿的功率模块全生命周期在线结温监测方法

功率模块结温在线监测对提升系统性能和可靠性具有重要意义。应用导通饱和压降和电流对结温进行估计,对测量带宽要求不高,对硬件和算法的侵入性低,是比较理想的结温在线监测方法。但是传统的测量方法很难满足结温精度要求,另外长期工作下功率模块老化会引起温度模型参数漂移,进一步加剧结温估计误差。为此,该文提出一套高精度测量电路和采样校准策略,应用温漂抑制、动态自适应采样、误差定向标定、同步时序控制等策略,大幅提高了在线采样分辨率和结温估计精度。针对老化问题,提出一种基于大电流注入的急停控制策略,解决了老化特征参数在线辨识问题,实现了结温模型的老化补偿,大大提高了老化后的结温监测精度,实现了全生命周期高精度在线监测。最后,在250kW三相变流器平台上进行了实验验证,得到老化前后的结温估计误差,证明了该文方法对提高结温监测精度具有明显效果。

基于超声导波的高温管道壁厚监测技术优化

超声导波技术因可将超声换能器与高温环境隔离而常被用于高温管道的壁厚监测系统,但高温下常规耦合技术失效问题和信号信噪比低的问题影响了测量系统的可靠性和测量精度。设计用于传导超声信号的导波杆,基于声学匹配原理优化干耦合技术,解决高温环境下常规耦合技术的失效问题。提出自适应激励方式和测量数据的乘幂算法以提高高温下测量系统的自适应性和信号信噪比。采用智能分段声速方法对声速进行修正,使高温超声导波测厚系统的测量精度达到±0.03 mm。实验结果表明:在500℃的长期热源环境下,超声波换能器端的温度最高不超过56℃,验证了测量系统在高温环境下的可靠性。

基于无线传感网络的电气设备温度智能监测系统

为防止由于温度异常造成的电气设备故障,提出基于无线传感网络的电气设备温度智能监测系统。利用无线传感网络及ZigBee网络采集节点,低功耗采集并传输电气设备温度信息到监测中心,利用DNN网络构建电气设备温度监测智能分析模型,实现电气设备温度的实时输出与处理。实验表明,该系统的信息传输功耗较低;可精准监测电气设备温度,可通过界面形式展现监测结果。

基于超声检测的管道壁厚在线监测系统

以超声检测技术为基础的油气管道壁厚在线监测技术,对降低人力监测成本,提高油气管道减薄及失效的早期预警能力有重要意义。基于超声反射法设计了一套具有多通道的高精度超声管道壁厚在线监测系统,并在不同的试验温度下进行多壁厚在线监测试验,最后对结果进行分析校正,得到修正方程和修正模型。试验结果表明,采用所提数据拟合修正方法,管道壁厚超声检测的绝对误差在±0.04 mm内,相对误差在1%内,实现了油气管道壁厚的高精度监测。

电容层析成像测量甲醇制烯烃催化剂床层温度

甲醇制烯烃作为煤制烯烃的关键一环,对实现煤炭的综合利用有重要意义。这一过程是典型的放热反应,为提高甲醇转化率与产物选择性,需对床层温度进行在线监测。基于高温电容层析成像,提出一种在线测量催化剂床层温度(DMTO工业催化剂,ZSM-5分子筛)的方法。通过与介电常数变化极小的石英砂、氧化铝等床层材料的测量结果对比,发现不同催化剂的介电常数随温度变化规律不同,催化剂床层的测量电容值随温度变化敏感且重复性较好。因此可通过高温电容层析成像装置测量温度分布均匀的床层归一化电容平均值实现对床层温度的测量。通过采用薄壁石英管的固定反应器,对甲醇制烯烃催化剂、ZSM-5分子床层进行在线测温验证了该方法的有效性,发现通过线性反投影算法重构的ECTt图像,可获得床层温度分布。由此,可以通过高温电容层析成像装置实现对固定床床层床层测温。

GaN器件稳态温敏电参数特性的研究

氮化镓(GaN)器件因具有高功率密度和高效率等特点,在快速充电设备和数据中心等场景中得到应用。然而,伴随着氮化镓器件热流密度的显著提高,结温成为器件可靠性不容忽视的重要因素。目前基于温敏电参数的氮化镓器件结温监测技术尚处于探索阶段,器件的温敏电参数特性并不明确。该文针对氮化镓器件常见的稳态温敏电参数,以小电流饱和压降、阈值电压和类体二极管压降为研究对象,考虑关联参数对三种温敏电参数特性的影响,提出波动系数用以表征温敏电参数的稳定性。通过实验对比,发现GaN器件的小电流饱和压降作为温敏电参数具有良好的温敏特性,优于其阈值电压和类体二极管压降,具有潜在的结温测量应用价值。

基于空间耦合传输方法的FBG传感器转子涡动测温误差及其影响因素研究

针对电机转子涡动对光纤光栅温度监测系统精度产生的影响,采用光纤光栅(FBG)的传输矩阵理论和自聚集透镜的耦合损耗理论,建立了涡动条件下FBG扫描光谱模型,结合相关试验,研究了扫描光谱的畸变规律及系统测温误差的影响因素。结果表明:涡动导致扫描光谱反射峰发生偏移、3 dB带宽减小,通过协调涡动频率和解调仪扫描频率,使准直器间耦合损耗周期达到FBG光谱扫描时间的10倍以上(q>10)是保证较低测温误差的关键;同时,质心法对剧烈涡动条件下扫描光谱的寻峰效果明显优于高斯曲线拟合法。随着转子端面处的径向位移幅值或轴线偏角幅值的增大,系统的测温误差先缓慢地增大、后剧烈地增大;随着椭圆形轴心运动轨迹轴比的增大,测温误差先剧烈地增大、后缓慢地增大至稳定。当转子径向位移幅值小于200μm、轴线偏角幅值小于0.167°时,在轴比等于3、q值等于10条件下,15次采样试验反映出质心法和高斯曲线拟合法分别令系统的测温误差从2.9℃降低至0.6℃和1.1℃,为监测系统的应用与测温精度的预估提供了依据。