TDR技术在高压加热器液位测量中的应用

针对TDR技术在液面水位动态监测中的应用,阐述了TDR技术的基本原理,分析了高温高压环境对电磁波测量的影响和基于TDR技术液位测量系统气相温压实时补偿原理,结合电厂高压加热器的工程实际应用,证实了TDR测量技术在高温高压环境下进行液位测量的可行性.     

基于虚拟仪器的轴线对中测量系统设计

针对大型输送设备对中测量中人工操作存在的操作复杂及耗费时间长等缺点,提出一种基于虚拟仪器的对中测量系统.采用LD-PSD和激光位移传感器在LabVIEW环境下应用研华数据采集卡完成信号的采集与处理,探讨了影响测量稳定性的因素和解决方案.现场实验表明：系统能够准确、快速、稳定地给出测量结果,性能达到了预期要求.     

注水井超声波法流量计测量系统设计

针对注水井在生产过程中油水混合、高温高压以及管道内充满杂质的复杂环境,设计出注水井超声波流量测量系统.该系统包括以压电陶瓷为核心材料的超声波换能器、高精度时差法流速测量电路、脉冲放大电路等硬件部分、和系统测量程序等部分组成.     

基于VB的拉丝模孔型测量计算机系统软件设计

设计了一种在Windows环境下基于VB.NET语言的拉丝模孔型测量计算机软件系统。该系统拥有可视化的操作界面,该界面可以显示出拉丝模孔型的结构曲线,并通过简单的操作可以得出拉丝模的相关尺寸及参数,同时针对不同工艺要求的拉丝模建立起模具数据库,达到在生产中快速测量与修复的目的。     

X线胶片密度测量系统波谱分析及光源选择

X线胶片光学密度是胶片信息的外观表现,也是判断胶片质量的一个重要参数.其测量的精确依赖于测量系统的设定.本文就X线胶片光学密度测量过程中系统波段设定对测量结果的影响进行了分析.结果表明,测量系统工作波段的选择是非常重要的.由于测量系统选用的实际光源其波段光强都是非均匀的,不同光源及工作波段的设定将造成胶片光学密度测量值间的差异.为使测量结果准确可靠,系统工作波段应尽量窄,测量系统光源应选用高光强、高稳定并与接受器件匹配的单色光源.     

Calibration Research of Platinum Resistor-based High Precision Temperature Acauisition System

针对基于铂电阻的温度传感器在采集和传输的过程中出现的误差而引起的测量误差,提出了采用硬件和软件补偿双重校准方法的温度采集系统设计方案.实验证明:该系统的测温误差小于0.05℃,具有精度高、分辨率高和抗干扰能力强的优点,可应用于对温度测量精度要求较高的环境中.     

基于视频图像分析的推进剂羽流烟雾透过率测量技术

为了对一定空间分布范围内的推进剂羽流烟雾进行光透过率的动态测量,建立了固体推进剂羽流烟雾遮蔽能力的视频图像测试系统。处理测量图像与背景图像获得测量图像的对比度,转换中性衰减片的测量结果为透过率。根据测量模型建立了测试系统,并进行了验证测试。结果表明,视频图像测量方法具有较大的空间测试范围,可以获得烟雾分布等更多信息,减小了环境背景光辐射的干扰。该方法所得数据的重复性好、系统稳定性好,可用于推进剂羽流烟雾光透过率的准确测量。     

基于图像分析方法的颗粒粒度测量

为了满足颗粒粒度测量的要求,研究开发了基于颗粒图像的颗粒体粒度测量系统。系统由硬件和软件两部分组成。硬件系统主要由图像采集和显示设备构成,可完成颗粒图像采集、存储和显示功能。软件系统由自主开发的基于Matlab环境的颗粒图像处理与分析程序组成,可完成颗粒图像的处理、颗粒粒度分析及分析结果显示等功能。颗粒测量结果表明,该系统完全可以满足颗粒粒度测量的要求,并具有测量精度高、效率高等特点。     

不同测压方式在气流床粉煤气化煤粉输送管线上的应用

在中国石化安庆分公司Shell煤气化装置的煤粉输送系统中,采用2种不同压力测量方式,对竖直上升管的压力进行了对比测量研究。研究结果表明,二者测量结果基本吻合,均可满足工程测量需求;2种测量方式各有优劣,可根据实际测量环境和需求进行选择。     

焦炉焦饼测温系统的应用

炼焦生产中,通过对焦侧焦饼表面温度的测量,可以推知焦炉各立火道的温度,从而有效控制炉孔内的燃烧效果.受出焦环境及工艺条件的限制,直接进行温度测量比较困难.本系统采用红外线非接触测温方式.随拦焦机一起运行.当焦饼温度大于某一值时开始测量数据,并由数据卡存储,数据卡可移至控制室由读出系统显示在计算机上,经过软件的分析,实现对数据的处理及趋势曲线的显示.     

小型实验室干燥动力学测试系统设计

对流式风洞干燥实验台是进行干燥基础与技术应用研究的必备实验装置。针对闭式循环、自动参数检测及数据采集等试验台必备功能,对小型实验室干燥动力学测试系统进行了工艺及装备设计,用于测量干燥动力学曲线和平衡数据。该系统可对干燥过程中干燥介质的温度、流量、湿度及物料的湿含量等参数进行在线测量与记录。     

Real-time monitoring of peanut drying parameters in semitrailers

Knowledge of peanut drying parameters, such as temperature and relative humidity of the ambient air, temperature and relative humidity of the air being blown into the peanuts, and kernel moisture content, is essential in managing the dryer for optimal drying rate. The optimal drying rate is required to preserve quality and desired flavor. In the current peanut-drying process, such parameters are elusive in real time and are either not measured or only measured periodically by an operator. A peanut-drying monitoring system, controlled by an embedded microcontroller and consisting of relative humidity and temperature sensors and a microwave peanut moisture sensor, was developed to monitor drying parameters in real time. It was deployed during the 2014 peanut harvest season at a peanut buying point in central Georgia, USA. It was placed in 45-ft (13.7-m) drying semitrailers to monitor in-shell kernel moisture content, temperature of the drying peanuts, temperature, and relative humidity of the exhaust air from the peanuts and relative humidity of the air being blown into the peanuts in real time. In-shell kernel moisture content was determined with a standard error of performance of 0.55% moisture content when compared to the reference oven-drying method. Data from drying parameters were time-stamped and stored on a CompactFlash card every 12?s and were used to assess the efficiency of dryer control settings. Ambient air conditions were measured by an on-site weather station. Results of the study support the value of such a monitoring system and show that implementation of the system for dryer control has the potential for saving a buying point, in the current economical context, as much as $22,000 annually in costs of electric energy and propane.     

Lifecycle Testing Results of Dimple Pleat Radial Flow HEPA Filters Under Ambient and Elevated Conditions

The Institute for Clean Energy Technology (ICET) at Mississippi State University (MSU) has developed testing capabilities for evaluating the American Society of Mechanical Engineers (ASME) Code on Nuclear Air and Gas Treatment (AG-1) section FK radial flow HEPA filters. These high efficiency particulate air (HEPA) filters are typically used at sites within the DOE complex to control particulate matter emissions. The goal of this testing was to provide information related to the performance of radial flow HEPA filters that use dimple pleat separators. Prior to this testing, insufficient data were available to determine the lifecycle performance of these filters. Two different types of dimple pleated radial flow HEPA filters were tested: a safe change design and a remote change design. Filters were tested at both ambient and elevated conditions of temperature and relative humidity. The challenge aerosols were Alumina (Al(OH)₃), Carbon black, and Arizona road dust. The performance of these filters at ambient conditions was determined by the filters’ mass loading capacity and filtering efficiency. Elevated condition performance was evaluated by the filters’ resistance to elevated temperature and relative humidity. The results indicated that the challenge aerosol had a large impact on the total loading capacity of the filters. Testing at elevated conditions of temperature and relative humidity revealed an issue with the strength of the dimple pleats. The dimples softened when challenged with elevated conditions, which led to filter failure due to a cascading reduction in free flow area and increase in differential pressure.

Copyright 2013 American Association for Aerosol Research     

环吹风温湿度的控制

介绍了环吹风与纺丝的关系。环吹风温湿度对车间前纺丝束冷却、降温起着重要作用。从温湿度,装置环吹风的控制原理等方面分析了影响环吹送风温湿度的因素。指出了分汽包蒸气压力的正常调整和异常处理方法。对环吹风温湿度的稳定起到良好效果。     

湿热处理对氨纶结构以及性能的影响

使用恒温恒湿老化试验箱,研究了高温高湿环境下氨纶力学性能及微观结构的变化。通过傅里叶变换红外光谱、热力学分析仪、扫描电子显微镜及力学性能分析探究了氨纶湿热老化规律及机制,结果表明:在一定牵伸条件下,随湿度增加,氨纶丝内部氢键化程度变弱且湿度变化对氨纶的影响主要发生在硬链段区域;在高温环境下,氨纶的拉伸强力和拉伸伸长率比在低温环境下的低,而300%拉伸应力比在低温环境下的高,说明氨纶湿热老化本质是湿度对氨纶内部氢键化程度及水解的协同作用,而温度起到加速老化的作用。     

CORRELATIONS FOR THE EQUILIBRIUM MOISTURE CONTENT OF SOI.IDS

Water adsorption and desorption isotherms at various temperatures have been generated for a variety of particulate materials (ion exchange resin, silica gel, wheat and cellulose materials). Most of thc data were obraincd with the SPS Equilibrium Moisture Content rig, using a dynamic equilibration method. Equilibration over saturated salt solutions at 2°C (static method) was also used for some of the data. Seven semi-empitical correlations, available in the literature, and one developed by SPS have been used to relate the equilibrium moisture content of the material to the relative humidity and temperature of the air. These equations enable the equilibrium moisture content to be predicted under various conditions of relative humidity and temperature from a small number of tests. For each of the six materials tested at least one of the correlations gave a good fit. However, there was no correlation which predicted the equilibrium moisnrre content well for every one of the six materials.     

温度和湿度对发射药自燃的影响

为了解环境温度和湿度对发射药热白燃规律的影响，以某单基发射药为例，在实验室中进行小型实验。采用均热块模拟加热、加湿法，选用不同直径的反应器，改变反应器中发射药所处环境温度和湿度，得到温度-湿度-自燃时间数据。结果表明，均热块温度越高，单基发射药的白燃时间就越短；当均热块温度一定，绝对湿度从相对较小值逐渐增大时，单基发射药的白燃时间先是变短，当达到最小值后又逐渐变长，直到发射药不自燃。表明湿度对单基发射药自燃规律的影响显著。     

环境温湿度对硫化的影响分析（轮胎会稿件）

本文主要研究环境温湿度对混炼胶硫化特性及轮胎硫化时间的影响,通过试验结果表明：混炼胶焦烧时间与贮存温湿度呈反比,混炼胶硫化速度与贮存的温湿度呈正比;随着胎胚温度的提高,发泡时间/硫化时间缩短;且通过模拟试验及现场发泡表明硫化的发泡时间与混炼胶t25均有一定的相关性;因此对于处在冬夏季温湿度差异较大的北方地区,区分冬夏季硫化时间是有必要的。     

野战弹药存储方舱的自适应模糊温湿度控制

分析了传统后方仓库温湿度控制的方法及特点,针对野战条件下温湿度控制的非线性、强时变性、随机干扰大的特性,提出了一种基于自适应模糊控制技术的温湿度控制系统。该系统在引入温湿度参考模型的基础上,给出了自适应模糊控制的控制规则、知识库修正方法和控制策略,同时,为较好克服扰动,加入了前馈控制器。仿真结果表明:该系统对温湿度的控制超调量小、响应时间短,克服扰动强,能较好地满足野战弹药存储的温湿度要求。     

Stochastic Modelling of Grain Moisture Content.in Near-Ambient Drying

A stochastic analytical model was developed to describe the mass transfer in a thin layer of grain ventilated with unheated air. As an excitation to the drying system, a stochastic analytical model of variations in ambient air temperature and relative humidity during the drying period, based on a sine function. was used. Mean. carrelation function, variance and the standard deviation were determined for main moisture content treated as a random process. The stochastic models of variations in air temperature and relative humidity were fined to the observed historical data. The standard deviation and m ean of grain moisture content calculated from the developed analytical model were compared to changes in mean and the standard deviation obtained from the numerical deterministic model of mass transfer and hourly weather data from 17 year.