风量罩测试试验台的开发与应用

首先介绍了风量罩的测试原理及方法,风量罩测试试验台的设计原理及使用方法。本试验台的流量测量方法是采用多喷嘴流量测量方法。多喷嘴流量法具有测量流量大,耐磨损、使用范围广的特点。其次,介绍了风量罩测试试验台的组成、设计主要参数及选用的各种仪器,并结合具体工程案例说明了试验台的组成及使用方法,在所设计的试验台上进行了风量罩的测试工作,并给出了测试报告,达到了比较满意的使用效果,能为今后的工程实践提供有力的理论支持,为风量罩的年度校准提供了保障,并希望能为我国风量罩标准的制定提供参考。     

基于多喷嘴系统的风量罩自动校准装置

本文基于多喷嘴系统设计了一套风量罩校准装置,并介绍了装置的设计原理及基本结构。该装置结构简单、性能稳定、方便溯源,可以作为校准机构及国内外生产厂家的校准、调试、测试平台。     

风量罩罩体阻力对测量结果的影响

介绍目前风口风量的测量方法和特点,分析风量罩罩体阻力对测量结果的影响,对不同型号的风机盘管机组的送风量进行测试。试验及其不确定度分析表明,风量罩的罩体阻力使得风口风量降低约1.0%,风量罩精度引起的不确定度约为风量罩罩体阻力引起的不确定度的2.5倍。     

风洞装置校准风量仪不确定度分析

介绍了风量仪的测量原理及校准风量仪的流量装置的原理及测量方法,并对使用风洞装置校准风量仪的测量不确定度进行了分析,对风量仪合理使用及校准提出了建议。     

风量仪校准装置的研制

本文基于目前风量仪溯源要求,研制出了一套新型的风量仪校准装置。该校准装置基于风洞技术,以槽道流量计为主要标准器,具有较高的稳定性及可靠性,满足了现有风量仪校准规范的要求。     

风量罩风量示值误差测量的不确定度分析

依据JJG 518—1998《皮托管》、JJG 640—1994《差压流量计》的检测方法,并参照了JJF(辽)81—2010《热式风速仪校准规范》对于风速类测量仪表不确定度的评定方法,对风量罩的不确定度进行了分析和评定。     

风量仪校准方法的研究

介绍了校准风量仪的一种方法,并对结果数据进行分析。该方法采用低速环形风洞和文丘里管节流装置,以高等级数字压力计为核心溯源装置,对流经风量仪的瞬时体积流量进行校准,并对可能影响校准结果的温度和压力变化进行定量评估,通过大量的试验数据表明,该方法能较好地满足风量仪校准需求。     

风机筒罩形式和送风方式对冷凝器风量及换热影响的试验研究

试验分析风机筒罩形式和送风方式对冷凝器风量及换热性能的影响,试验结果表明：具有圆弧角（15°）拉拔的风筒罩能够有效减少空气的涡流损失,其风量较直角拉拔的风筒高4%;吸风形式的冷凝器较吹风形式的风量高1.2%,换热量高8%。     

厨房排烟道出风量的两种测量方法的比较

本文对热球式风速仪和风量罩进行了介绍，并对二者在出风量测量上的差别做了分析和比较，并通过实测数据进行了说明。     

LIMS环境下如何构建电子类自动校准系统

自动校准系统是指在程序特定运行环境中,由标准器、被校准仪器在计算机指令控制下,完成校准过程,获得、保存(或含处理)校准结果的程序。本文以MT8801无线通讯分析仪为例,阐述了在LIMS环境下基于Labview编程构建自动校准系统框架,最终实现校准系统与实验室信息管理系统(LIMS)的自动连接的过程,对LIMS未来在自动校准系统中的运用进行了展望。     

基于Edlén公式空气折射率测量系统的校准研究

为了检验对激光干涉仪测量精度有很大影响的空气折射率测量系统的测试性能,提出一种可用于基于Edlén公式的空气折射率测量系统的校准方法,并且设计了专门的校准装置,该装置主要由温度、气压以及湿度测量系统组成。实验证明：取包含因子k=2时,温度在(5~40)℃区间,测量不确定度U优于0.02 ℃;气压在(66~105)kPa区间,U=18 Pa;湿度在(10~90)%RH区间,U=2.0%RH,等效于整个系统对应的空气折射率测量的相对不确定度优于1×10^-7     

Improving the Traceability of Meteorological Measurements at Automatic Weather Stations in Thailand

A joint project between the National Institute of Metrology Thailand (NIMT) and the Thai Meteorology Department (TMD) was established for improving the traceability of meteorology measurements at automatic weather stations (AWSs) in Thailand. The project aimed to improve traceability of air temperature, relative humidity and atmospheric pressure by implementing on-site calibration facilities and developing of new calibration procedures. First, new portable calibration facilities for air temperature, humidity and pressure were set up as working standard of the TMD. A portable humidity calibrator was applied as a uniform and stable source for calibration of thermo-hygrometers. A dew-point hygrometer was employed as reference hygrometer and a platinum resistance thermometer (PRT) traceable to NIMT was used as reference thermometer. The uniformity and stability in both temperature and relative humidity were characterized at NIMT. A transportable pressure calibrator was used for calibration of air pressure sensor. The estimate overall uncertainty of the calibration setup is 0.2 K for air temperature, 1.0 % for relative humidity and 0.2 hPa for atmospheric pressure, respectively. Second, on-site calibration procedures were developed and four AWSs in the central part and the northern of Thailand were chosen as pilot stations for on-site calibration using the new calibration setups and developed calibration procedures. At each station, the calibration was done at the minimum temperature, average temperature and maximum temperature of the year, for air temperature, 20 %, 55 % and 90 % for relative humidity at the average air temperature of that station and at a one-year statistics pressure range for atmospheric pressure at ambient temperature. Additional in-field uncertainty contributions such as the temperature dependence on relative humidity measurement were evaluated and included in the overall uncertainty budget. Preliminary calibration results showed that using a separate PRT probe at these AWSs would be recommended for improving the accuracy of air temperature measurement. In case of relative humidity measurement, the data logger software is needed to be upgraded for achieving higher accuracy of less than 3 %. For atmospheric pressure measurement, a higher accuracy barometer traceable to NIMT could be used to reduce the calibration uncertainty to below 0.2 hPa.     

高精度全自动V棱镜折射仪的改进

利用CCD成像与图像处理的机器视觉自动对准技术,在考虑了空气折射率对V棱镜折射仪测量精度影 响的基础上,对V棱镜折射仪原有的原理公式重新进行数学建模,提出了一种改进全自动V棱镜折射仪的方案。 用已知折射率的玻璃标准样块对改进后的仪器进行了评定,测试结果与标定值绝对误差不超过± 3 X 10^-6,测量重 复性优于1 x10^-6。     

基于固定优先级算法的便携式检定仪自动校准

针对研发的军用便携式检定仪计量校准的需求,设计了校准量值的传递与保证方案,提出一种基于固定优先级的自动校准算法.该算法中,占用相同校准资源的校准任务按优先级执行,占用不同校准资源的校准任务则并行执行,充分利用了校准资源.通过以太网接口进行数据通讯,设计了自动校准程序,实现了便携式检定仪自动化校准.     

A virtual instrument for automatic anemometer calibration with ANN based supervision

A fully automatic anemometer calibrator intended for performing fast and accurate calibrations has been developed to fulfill the increasing demand and strict requirements of the wind energy industry. Different sensors are connected to a computer where a virtual environment acquires and processes the incoming signals and controls a wind tunnel, allowing the calibration of the anemometer at the pre-selected air speed values. An important part of the resulting complex virtual environment is a supervising system, based on artificial neural networks and able to check and handle the possible malfunctions and deviations within the calibration process.     

功率传感器自动校准系统数据库的设计与实现

为了实现对功率传感器自动校准系统中校准数据的存储、查询等功能,设计并实现了一套嵌入在功率传感器自动校准系统中的数据库管理系统。本系统采用模块化设计思想,具有占用系统资源少、运行速度快等优点。经过测试,所设计的数据库管理系统能够满足功率传感器自动校准系统工作的需要。     

电磁混响室场均匀性校准装置研制

介绍了电磁混响室电场统计均匀性校准的原理和方法,着重论述了空间场均匀性校准装置及自动校准系统的设计,并介绍了自动校准软件设计。     

A COMPACT DYNAMOMETER USING AIR GAUGE PRINCIPLES

The compact two-component dynamometer described is intended for use in the restricted space around the tools of a Swiss-type automatic. The general construction of the instrument, which employs air gauging principtes, is discussed and it is reported that its performance is unaffected by the abundant use of cutting fluid. Calculation of the parameters of the pneumatic system, and the calibration and performance of the complete system are discussed.     

基于CFD技术的气流温度传感器数值校准虚拟风洞初探

在气流温度传感器风洞校准试验中,由于有试验成本高、校准试验环境与实际使用环境差距大等各种原因,有必要构建气流温度传感器数值校准虚拟风洞,实现极限非常规校准工况的气流温度传感器的误差修正及虚拟校准,并通过气流温度传感器的虚拟校准数值风洞获取仿真结果,尽可能地减少实物校准的工况数量,同时也从理论层面为气流温度传感器的设计与校准提供补充。本文介绍了气流温度校准技术国内外发展现状,分析了气流温度传感器数值校准虚拟风洞实现思路及方法,探讨了如何利用CFD技术在计算机平台上建立虚拟仿真风洞以模拟真实的校准环境,为建立国产化气流温度传感器数值校准虚拟风洞提供技术参考。