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2020 Vol. 41, No. 12A
Published: 2020-12-28
1
Research on Technology Development of Micro Liquid Flow Facility
LIU Li,ZHOU Chang,GAO Feng,MENG Tao
DOI: 10.3969/j.issn.1000-1158.2020.Z1.01
In order to establish Chinese micro liquid flow standards, the micro liquid flow facility of different countries and regions have been investigated. The flow range is 50nL/min~1000mL/min, and the uncertainty is 0.04%~4.5%. The parameters such as flow range, uncertainty level, pressure, temperature are collected, and the water supply system, degassing system and liquid collection system of the facility are classified and summarized. The water supply system is mainly composed of capillary tube, injection pump and mass flow controller. The degassing system is mainly composed of ultrasonic degassing or online degassing. The liquid collection system is mainly divided into three methods:the outlet pipe and the beaker form a liquid bridge and humidity trap, the outlet pipe is immersed in the liquid surface and the oil film is covered, and the outlet pipe is immersed in the liquid surface and the humidity trap. Finally, the main sources of uncertainty such as timer drift and communication delay, balance drift and calibration, evaporation, buoyancy and surface tension, flow stability and repeatability are summarized.
2020 Vol. 41 (12A): 1-6 [
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195
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7
Uncertainty Evaluation and Capability Verification of Gas Flow Close Loop Standard Facility
LI Chun-hui,CI Li-shui,WANG Chi,CAO Peng,WANG Su
DOI: 10.3969/j.issn.1000-1158.2020.Z1.02
At the end of 2014, the first gas flow close loop standard facility in China was built in National Institute of Metrology (NIM). The standard facility uses four DN100 turbine flowmeters as master meters, and the achievable flowrate range is 40~1400m3/h as well as the pressure range is 190~2500kPa. Based on the in-situ calibration technology of the master meter and the pressure measurement method of absolute pressure+differential pressure, the best uncertainty of the standard facility to calibrate the flowmeter is 0.18%(k=2). In January 2020, the gas flow close loop standard facility passed the construction standard assessment, and the testing service was officially launched in March 2020.
2020 Vol. 41 (12A): 7-10 [
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229
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Research on Online Environmental Adaptability Experiment System of Flowmeter
LI Xiao-peng,XING Chao,MENG Tao
DOI: 10.3969/j.issn.1000-1158.2020.Z1.03
The on-line environmental adaptability experiment system of flowmeter is composed of two parts, the test box and the control unit. The test box adopts the upper and lower split structure, which can adapt to the complex experimental environment. It can be installed in different experimental pipelines.The system can simulate the temperature range of (-40~60) ℃ and the relative humidity range of 30%~98%. It can test the change of flowmeter in different environments.Through the test of six electromagnetic flowmeters, the following conclusions can be drawn:With the change of ambient temperature, the indication error of different flowmeters varies, and the maximum variation is about 12.63%. The results show that the harsh ambient temperature has obvious influence on some electromagnetic flow meters. Different ambient temperature has little effect on the repeatability of electromagnetic flowmeter.
2020 Vol. 41 (12A): 11-15 [
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165
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16
Numerical Study on The Influence of Pipeline Valves on Liquid Flow Characteristics
JI Jie-qiang,ZHENG Jian-ying,YU Song-qing,WU Xiao-jie,CHENG Le-ming
DOI: 10.3969/j.issn.1000-1158.2020.Z1.04
To investigate the influence of valve opening on the flow characteristics, the 3D calculations are carried out to simulate a circular pipe containing a ball valve by CFD method. The opening and closing process of the valve are modeled by the dynamic grid technology. Firstly, the flow characteristics inside the pipe with the valve fully opening are studied, and the results are compared with the experimental data from literature. It shows that using the standard k-ε turbulence model could get more accurate results. Furthermore, the flow field distributions at different valve opening degrees are investigated. The simulation results show that the change of valve opening degree has obvious influence on the downstream flow field. However, the disturbance will gradually weaken along the flow direction, and the flow field return to uniform distribution at the critical distance. Flowing through the valve, the liquid flow is separated to form a high velocity region and low velocity region at the cross section. For different valve opening degree, the flow velocity stratification is different. With the decrease of opening degree, the critical distance first increases and then decreases, and the maximum critical distance appears at 50% opening degree.
2020 Vol. 41 (12A): 16-21 [
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220
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22
Uncertainty Evaluation of Natural Gas Energy Measurement
LI Chun-hui,XU Ming,SHEN Chao,CHEN Wen-ling
DOI: 10.3969/j.issn.1000-1158.2020.Z1.05
Based on the general calculation formula of natural gas energy measurement and combined with the actual conditions and experimental results in the field experiment, the uncertainty evaluation of natural gas energy measurement was analyzed in detail. The sources of uncertainty mainly included the volume flow rate, the calorific value per unit volume, the integration method and other related factors under the measurement reference conditions. The complete uncertainty analyses model was presented in this paper, which had significant value for the implementation of natural gas energy measurement in my country.
2020 Vol. 41 (12A): 22-27 [
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179
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28
Chongqing Academy of Metrology and Quality Inspection, Chongqing 401123, China
WANG Wei,XIA Jie,ZHOU Wei-hui
DOI: 10.3969/j.issn.1000-1158.2020.Z1.06
Adopting the principle of positive pressure method, a flow fluctuation durability test device has been designed through the customization and integration of air compressor, pressure regulator tank, pressure reducing valve and other basic parts. Its valve response time is less than 100ms, pipeline gas flow rate is not more than 5m/s, and the capacity pressure drop of the air source is less than 300Pa. The technical indexes meet the technical requirements of 2000h flow fluctuation mechanical durability test in the national recommended standard GB/T 6968-2019 Membrane Gas Meter.
2020 Vol. 41 (12A): 28-31 [
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200
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32
Analysis of Influence of Different Gas Source Mixture on Natural Gas Flow Measurement
JIN Zhong-xiang, HUANG Guan-wen, LIU Yi-wen, SUN Nan, FU Shao-quan
DOI: 10.3969/j.issn.1000-1158.2020.Z1.07
In the process of flow measurement of natural gas, the mass component of natural gas is an important parameter, and the mixing of different gas sources will cause great fluctuations in compression factor, high calorific value and methane content, etc., and the mixed natural gas will have an obvious influence on flow measurement. To study the mixed gas of different gas source for the influence of gas flow metering, first of all, adopt the method of off-line calculation analysis of the influence of different air mixing fluctuations of flow measurement, the results showed that long-term use of fixed for mixing gas source gas metering of natural gas component, will produce the measurement deviation, finally aimed at the influence of different gas source to flow metering, component changes to collect accurate and reliable measures and suggestions are given.
2020 Vol. 41 (12A): 32-36 [
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174
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37
Study on Velocity Distribution of Pipeline under Fully Developed Condition
CAI Qin,LIU Dun-li,HU He-ming
DOI: 10.3969/j.issn.1000-1158.2020.Z1.08
In order to analyze the flow velocity distribution of the pipeline and its center symmetry, a plug-in ultrasonic flowmeter is used to measure the flow velocity of each area in the pipeline under the conditions of different installation angles and different flow velocity points. The experimental results show that the velocity of the pipeline decreases from the center to the edge, which is basically symmetrical distribution in the high velocity state and asymmetrical distribution in the low velocity state; the velocity of the area above the pipeline section is slightly larger than the area below, and the velocity of the horizontal centerline area is slightly larger than the vertical centerline area. It is shown that the velocity distribution of the pipeline is not strictly centrosymmetric under the fully developed condition, the change of the installation angle of the multi-channel ultrasonic flowmeter on the pipeline will cause the change of its measurement performance to a certain extent, especially in the low flow rate state.
2020 Vol. 41 (12A): 37-40 [
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181
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41
Analysis and Evaluation of Heat Pipe Heat Exchanger's Performance with Low Global Warming Potential Refrigerant
ZHANG Shi-jie,LI Zhun,ZHOU Feng,SUN Shu-fang,MA Guo-yuan
DOI: 10.3969/j.issn.1000-1158.2020.Z1.09
Due to alternative refrigerants requirement a heat pipe heat exchanger was developed charged with refrigerant R32, which owns low global warming potential. Experimental study and evaluations had been done in the standard psychrometric laboratory upon heat pipe heat exchanger charged with R32 under different working conditions according to its thermodynamic characteristics. For performance evaluation the energy, energy efficiency and exergy were adopted in both quantity and grade basing on the first and second law of thermodynamics. The results indicate that refrigerant R32 shows better performance for winter conditions compared to summer conditions, especially in temperature effectiveness, heat transfer rate, energy efficiency ratio, dimensionless entropy generation rate and exergy loss merit. Compared to parallel heat exchangers, the temperature effectiveness of inclined heat exchanger increases by 11.7 to 12.9% averagely with 5 degree inclination angle, and energy efficiency ratio (EER) rises by 0.6 to 3. The dimensionless entropy generation rate decreases by 0.012 in summer and 0.0024 in winter when the indoor and outdoor temperature difference increases by 1 degree for parallel heat exchanger. For inclined heat exchanger, the exergy loss rate merit increases by 0.0159 in summer and 0.0015 in winter for one degree.
2020 Vol. 41 (12A): 41-46 [
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190
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47
Study on Verification Method of Metering Calorific Value of Pipeline Natural Gas
LIU Zhe,WU Yan,JIANG Xing-peng,ZHOU Yang,SONG Chao-fan,ZHOU Zhen-dong
DOI: 10.3969/j.issn.1000-1158.2020.Z1.10
The methods of on-line chromatograph analysis, off-line analysis and assigned component analysis for indirect calorimetry were studied and applied to the quality check of composition analysis results. Ultrasonic flowmeter sound velocity test is carried out in accordance with the prescribed method of GB/T 30500. When the deviation between measured sound velocity and calculated sound velocity is within ±0.15%, the analysis data of natural gas composition meets the requirements. Select configuration online chromatographic analyzer station, according to the results of chromatograph dynamic trend analysis, when the A level measurement system more than online calorific value fluctuation control limit (maximum permissible error of plus or minus 0.5%), determine the chromatograph analysis results appear problem, this method can effectively monitor the calorific value data, to ensure pipeline gas in the process of energy metering data accurate and reliable.
2020 Vol. 41 (12A): 47-51 [
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233
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52
Research on Measurement Performance of Ultrasonic Flowmeter Based on Reticulated Acoustic Path Arrangement
CHEN Hui,YAN Xue-zhi
DOI: 10.3969/j.issn.1000-1158.2020.Z1.11
An ultrasonic flowmeter for liquid based on reticulated acoustic path arrangement is developed. The layout of ultrasonic transducers based on the principle of directivity, and a 16-channel ultrasonic flowmeter formed by 16 transducers in DN100 diameter is realized by using one transducer to transmit the ultrasonic wave and the other two transducer to receive. Through the intrinsic errors test and repeatability test under normal installation condition, the accuracy level of 0.2 is achieved, and the repeatability is less than 0.6‰. In addition, the flow field adaptability and stability of the ultrasonic flowmeter based on reticulated acoustic path arrangement are verified through the intrinsic errors test of indication after the Angle installation and flow disturbance.
2020 Vol. 41 (12A): 52-57 [
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168
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58
Real Flow Calibration of Standard Nozzles Under High Pressure Natural Gas
CHEN Xing-chuan
DOI: 10.3969/j.issn.1000-1158.2020.Z1.12
In order to verify the performance of standard nozzles under the condition of high pressure natural gas, two standard nozzles with different diameters were selected to carry out the real flow calibration test under different pressure conditions. The work standard device of Guangzhou branch of National Petroleum and Natural gas mass flow metering station was used to carry out the test. The experimental results show that the test results of standard nozzles at three different pressure points are consistent, and the test results at each pressure point meet the requirements of GB/T 18603 class A metering system. Meanwhile, the uncertainty evaluation of DN200 caliber standard nozzles was conducted, and the evaluation results also meet the requirements of GB/T 18603 class A metering system. Standard nozzles perform well under high pressure natural gas.
2020 Vol. 41 (12A): 58-62 [
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164
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Experimental Study on Meters Factor of Clamp-on Type Ultrasonic Flowmeter with Different Pipe Diameters
XU Rui-xiang,YAO Yi-guo,ZHAI Heng-tao,TANG Fa-wei,HAN Ming,XIAO Yuan-huan,XUE Lei
DOI: 10.3969/j.issn.1000-1158.2020.Z1.13
To study the meters factor of clamp-on type ultrasonic flowmeter under different pipe diameters with different flow velocity points, six pipes are selected within the pipe diameter between 100mm to 400mm and six flow velocity points are selected within the range of 0.3～3m/s to experimental study. The results of experiments show that the error of every flow point changed slightly under the same pipe diameter. With the increase of pipe diameter, the error under the same flow point decreases and the meters factor increases. By establishing mathematical model, the meters factors are compared between the mathematical model and the experimental study, it proves that of using the mathematical model to derive the meters factor under different pipe diameters is feasible, it can improve the measurement accuracy of the flowmeter under different pipe diameters.
2020 Vol. 41 (12A): 63-67 [
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168
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Research on Network Traffic Transmission Principle and Measurement Technology
YANG Kun,CUI Wei-qun,TENG Jun-heng
DOI: 10.3969/j.issn.1000-1158.2020.Z1.14
With the booming of the information consumer market, it is urgent to provide measurement technical support for the measurement of network traffic and broadband speed due to the traffic-based billing model. Bit is the basic measurement unit for network traffic and broadband speed, and as a new measurement, related research is rare. Through in-depth exploration of the existence form and transmission mode of bit, we have a better understanding of its static and dynamic characteristics, so as to lay the foundation for establishing a bit measuring standard that can be traced to National primary pulse standard by comparing the analog channel and the digital channel of a high-precision oscilloscope. The study of bit measurement also triggered relevant thinking about international measurement units and measurement trends, and finally discussed this.
2020 Vol. 41 (12A): 68-75 [
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147
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Research Status and Development of Camshaft Geometrical Parameters Measurement Technology
LIN Hu,YANG Wu-wei,XUE Zi,YANG Guo-liang
DOI: 10.3969/j.issn.1000-1158.2020.Z1.15
The camshaft is one of the important parts of the engine, and its accurate measurement and error evaluation has always been the research focus of precision measurement. The current research status of camshaft geometry measurement technology and the specific instruments based on various measuring principles were introduced comprehensively. At present, the vertical camshaft measuring instruments with high accurate and multi-function are popular applied, and the optical non-contact measuring methods and instruments have a great prospect for development because of high measuring efficiency. Some key technical methods applied in cam measurement data processing and error evaluation are analyzed. Each method has advantages and disadvantages. Therefore, more suitable methods still need to be studied. A cam measuring method based on the principle of laser interferometry is proposed. The laser interference length measurement can be directly traced to the length reference “m”, which can improve the measurement accuracy of the cam. The calibration and unification of various camshaft measuring instruments are of importance in future. The JJF 1795-2020 Calibration specification for camshaft measuring instruments is released and implemented, which provides a unified reference method for the calibration and inspection of instruments. However, the evaluation for software algorithm is still currently lacked in domestic, so it is urgent to carry out relevant research work.
2020 Vol. 41 (12A): 76-84 [
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173
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85
Research on Robot Kinematics Parameter Calibration Based on Particle Swarm Optimization
CHEN Xiang-jun,ZHAO Zhi-fang,Ren Guo-ying,LI Da-chao,BAN Zhao
DOI: 10.3969/j.issn.1000-1158.2020.Z1.16
In order to improve the absolute positioning accuracy of robot end, a calibration method of robot kinematic geometric parameters based on particle swarm optimization (PSO) was proposed to identify and compensate the parameter errors of industrial robots. First, in order to avoid the singularity when two adjacent axes of the manipulator are parallel, MDH parameter method was adopted to establish the error model. Secondly, in order to define the measurement data on the same coordinate axis, the coordinate conversion method of synchronous calibration of robot orientation and hand-eye relationship combined with model precision compensation was used. Then particle swarm optimization (PSO) algorithm was used to identify the model geometric parameter error. Through the simulation, experimental calculation and calibration of ABB industrial robots, the average absolute positioning accuracy of robots was improved by 66.9%. The results showed that the calibration algorithm can effectively identify the model parameter errors of the robot and improve the absolute positioning accuracy after compensating the model parameters of the robot.
2020 Vol. 41 (12A): 85-91 [
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184
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92
The Application of MSA in Roughness Measurement
HUANG Cai-qing,LUO Jin-gang
DOI: 10.3969/j.issn.1000-1158.2020.Z1.17
In order to apply measurement system analysis to actual work correctly and reasonably and to ensure the validity of measurement data, surface roughness is chosen as measurement parameter combing with actual products demand and the measurement system analysis in the practical application of roughness measurement and common pitfalls are comprehensively explained from discrimination, bias, linearity, stability, repeatability and reproducibility and several aspects. This method has important reference and guidance significance for the wide and correct application of measurement system analysis in other measurement fields.
2020 Vol. 41 (12A): 92-95 [
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182
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96
Study on Temperature Sensor Verification System Based on 18B20
WU Chun-ai,WANG Shuo-fei,JIANG Tao,LIU Yu
DOI: 10.3969/j.issn.1000-1158.2020.Z1.18
A circuit detection system which can be used for large-scale multi-purpose temperature measurement to realize the calibration of 90 channels temperature sensor is designed. RS-232 serial communication standard is adopted in the system, the temperature data are collected on the spot by the lower computer (single chip microcomputer), collects three groups of temperature every three seconds, realizes the automatic verification of temperature, and compares with the standard thermometer through the serial port, calculates and distinguishes the temperature data automatically. Grid sensor, and automatically generate verification certificates and verification results notice. Through software design and hardware connection, the calibration of regional automatic weather station temperature sensor is realized.
2020 Vol. 41 (12A): 96-99 [
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158
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100
Research on Measurement Design of Group Weight Value Transfer Based on Intelligent Detection Technology
WANG Lian-fang,MA Kun,LIU Ping,YUAN Xin,ZHANG Kai
DOI: 10.3969/j.issn.1000-1158.2020.Z1.19
In order to improve the efficiency and accuracy of group weight value transfer, automatic intelligent detection is gradually replacing artificial detection. Based on the characteristics of the full-automatic intelligent detection device and the demand of group weight value transfer, the measurement design method of three position and four position component combination method is proposed, the mathematical model is established, and the uncertainty analysis is carried out. By comparing the three position and four position component combination method with the traditional five position component combination method, it is proved that the three position and four position component combination algorithm applicable to intelligent detection robot is effective and feasible, which is helpful to promote the application of intelligent detection technology in the field of group weight measurement.
2020 Vol. 41 (12A): 100-105 [
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215
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106
Research on Calibration Method of Standard Diaphragm
KE Shu-ting,KE Gang,WAN Li-fen,WANG Li
DOI: 10.3969/j.issn.1000-1158.2020.Z1.20
In order to achieve the calibration of the standard diaphragm in ambient air monitoring, the calibration process of the standard diaphragm is standardized, including visual inspection, reduced mass, area, mass per unit area, etc.. Put forward the calibration method of the standard diaphragm will calibrate diaphragm with a single or a combination of the n E2 level weights compare get reduced mass on measuring instrument, the measurement area in the image measuring instrument, and then calculate the standard diaphragm mass per unit area, it is used to calibrate the continuous automatic monitoring equipment of ambient air particles and provide a basis for measuring the accuracy of the automatic monitoring of ambient air particles.
2020 Vol. 41 (12A): 106-109 [
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203
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Improvement of the 2500Pa Reference Micromanometer
MA Ke,YANG Yuan-chao,WANG Peng
DOI: 10.3969/j.issn.1000-1158.2020.Z1.21
By analyzing and studying the performance of the 2500Pa micro-pressure reference after modification, the relationship between working medium temperature and the liquid level height of the container was summarized, the relationship was extracted, and the liquid level height/temperature coefficient at the pressure point 0 was obtained:a=0.030mm/℃; b=0.017mm/℃; Using the modified formula to optimize the water density value method, the accuracy of the water density value was improved by 0.0006% on average, and the errors in the density table of relevant regulations were corrected. The comparison experiment En<1, Obtain satisfactory results. Through the above optimization, the performance of the micro-pressure benchmark can be improved to meet the demand of traceability and transmission of pressure value in the development of the times.
2020 Vol. 41 (12A): 110-115 [
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232
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116
Research on Dynamic Calibration of Dynamically Tuned Gyro Based on Laser Interferometry
HUANG Xiang-hua
DOI: 10.3969/j.issn.1000-1158.2020.Z1.22
To meet the requirements for dynamic characteristic calibration of dynamically tuned gyro flexural components in national defense and aerospace engineering, a set of dynamic characteristic calibration device for dynamically tuned gyro flexural components was researched and built. After the calibration device were verified through several tests, and the calibration results were compared on the regional highest measurement standard device.The experimental verification results showed that the calibration device is able to meet the calibration requirements for the dynamic deflection characteristics of dynamically tuned gyro.
2020 Vol. 41 (12A): 116-123 [
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158
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124
Reaserch on the Method of Measuring Inertial Product Based on Vertical Rotating Balance System
ZHANG Lei-le,WU Yi-yong,SHI Yong-hua
DOI: 10.3969/j.issn.1000-1158.2020.Z1.23
In view of the shortcomings of the existing methods for measuring the product of inertia of flying objects, a method for calculating the product of inertia based on the vertical rotating balance measurement technology is proposed. A rotary balance measurement turntable is constructed, the data acquisition and calculation processing method are introduced, error analysis is carried out. Combined with the actual engineering application, the standard workpiece is selected for multiple measurements, and the satisfactory results are obtained.
2020 Vol. 41 (12A): 124-128 [
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193
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129
Fracture Failure Analysis on Combined Spring Based on Micro and Nanometer Measurement Instrument
TANG Xiao-cong,WANG Min,GUO Xin
DOI: 10.3969/j.issn.1000-1158.2020.Z1.24
By means of scanning electron microscope, metallographic microstructure observation and analysis, hardness test and chemical composition analysis of materials, the failure reasons of composite spring are explored. The fracture morphology of the spring shows that the spring suffered from fatigue failure, and the in-depth analysis results show that the fracture inducement can be considered as the stress at the contact point of the surface of the middle spring after the abnormal stress distortion of the spring, and the stress concentration starts the crack, thus the fatigue extension and torsion failure.
2020 Vol. 41 (12A): 129-134 [
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201
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135
Research on the Standard Device of First-class Metal Tank by Constant Elevation
LI Ning,XIANG De-hua,ZHOU Yan
DOI: 10.3969/j.issn.1000-1158.2020.Z1.25
To analyze the advantages and disadvantages of three methods of constant liquid level of the standard metal tank, and determine a new method of constant liquid level of the standard device of first-class metal tank. Based on this method, a standard device of constant level of first-class metal tank is designed, it can automatically and accurately read the liquid level, the automatic control of the value transmission process of the standard device of first-class metal tank was realized. The device can effectively control the temperature of the verification medium and the ambient temperature, and the human impact during the measurement process was reduced. The test shows that: the maximum difference of the reproducibility measurement of constant liquid level scale of the first-class metal tank was 0.04mm, the test standard deviation of the standard device was two thirds lower than that of the traditional standard device.
2020 Vol. 41 (12A): 135-141 [
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163
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142
High Precision Automatic Measurement System for Volume of Railway Tanker
ZHANG Zhi-peng,SHAO Xue-jun,PANG Qing
DOI: 10.3969/j.issn.1000-1158.2020.Z1.26
Aiming at the problem of accurate and automatic measurement for volume of railway tanker, a high precision automatic measurement system for volume of railway tanker is proposed. By using the sensor and automatic control technology, the software and hardware system represented by the standard gauge connected overflow device, the high-sensitivity precious metal probe automatic detection liquid level and early warning device, the upper and lower double liquid inlet intelligent control device and the standard gauge grouping device are studied and designed. Through the test and verification, the system has high measurement accuracy, greatly improved automation, work efficiency and work safety, reduced labor intensity, reduced personal hazards of operators, greatly saved working time, and met the requirements of International Organization of Legal Metrology OIML R80. It provides accurate technical basis for volume measurement of large and medium capacity measuring devices such as railway tankers, trade settlement of railway liquid goods, safe loading control, production, design and manufacture of railway tankers and tank containers.
2020 Vol. 41 (12A): 142-147 [
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148
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Uncertainty Evaluation on the Metrology Vehicle of Detecting Device for Overload and Unbalance Load
DUAN Xiao-jun,LI Shi-lin,CUI Bao-xiang,LI Xue-bao,HOU Xiu-lin
DOI: 10.3969/j.issn.1000-1158.2020.Z1.27
To study the accuracy and reliability of the multi-parameter measurement results of the metrology vehicle of detecting device for overload and unbalance load, implement the dissemination of quantity values on the detecting device for overload and unbalance load of rail wagons, and ensure the consistency of quantity value, the standard detecting device for overload and unbalance load is studied and established. The uncertainty factors affecting the determination of each parameter are analyzed according to JJF 1059.1-2012 Evaluation and Expression of Uncertainty in Measurement, and the uncertainty of each parameter is evaluated by GUM method. The results show that the extended uncertainties of all parameter measurement are less than its maximum acceptable extended uncertainty.
2020 Vol. 41 (12A): 148-154 [
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158
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155
Design and Construction of Full Performance Intelligent Testing System for Electric Energy Metering Equipment
JU Han-ji,DING Heng-chun,ZHU En-guo,HAN Di,WANG Gui-xian,CUI Wen-wu1,WANG Chen
DOI: 10.3969/j.issn.1000-1158.2020.Z1.28
Aiming at the problems of large number of items and long testing period in the full performance test of electric energy metering equipment, the flexible testing technology compatible with five kinds of electric energy metering equipment is studied. Based on a pipeline, 7 categories, more than 100 items are intelligent scheduled, including function, accuracy, electrical performance, insulation, electromagnetic compatibility, mechanical performance, full event. Instead of manual operation, standardized automatic operation improves the consistency, standardization and reliability of detection. Some technical problems of automatic and rapid catching of test abnormal phenomena are overcome, such as flashover, discharge, crash, restart. The operation status of the system equipment are real time monitored and diagnosed. The abnormalities or failures are real time warned. The automatic storage and standard processing of test results, as well as the intelligent judgment of unqualified items are realized.
2020 Vol. 41 (12A): 155-161 [
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208
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162
Study on Calibration Method of Differential Resistor Reading Instrument and Uncertainty Analysis
HE Hao-peng,ZHANG Xin
DOI: 10.3969/j.issn.1000-1158.2020.Z1.29
In view of the fact that the only measurement method can not meet the calibration requirements of high accuracy and full range differential resistor reading instrument, the digital multimeter is proposed as the measurement standard, and the comparison method is used to calibrate the resistance ratio indication error, resistance indication error. The uncertainty of measurement results of resistance ratio indication error is analyzed, and the expanded uncertainty is 6×10
-5
(k=2). In order to improve the accuracy of measurement results, the method of adding variable resistance into the calibration circuit is used to measure the influence of core wire resistance on indication value. At the same time, the four wire resistance linearity experiment is carried out to analyze the reliability of DMM as the measurement standard, and then verify the scientificity of calibration method.
2020 Vol. 41 (12A): 162-166 [
Abstract
] (
169
)
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125
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167
Design and Establishment of Anti-cosmic Ray Low Background Gamma Spectrometer System
ZHANG Zhen-zhen,FAN Zi-hao,ZHOU Qian-qian,LIANG Jun-cheng,ZHANG Ming
DOI: 10.3969/j.issn.1000-1158.2020.Z1.30
Based on the study of background and shielding method in gamma spectrometer, an anti-cosmic low-background γ-ray spectrometer system which the integrated background is up to 1.1×10
-1
s
-1
/100cm
3
Ge in the energy region between 100keV and 2500keV was built. Apply this device to measure the standard samples of 75mm×70mm soil substrate and 75mm×35mm biological ash substrate. The minimum detectable activity of137 cs in soil samples was 0.089Bq; the minimum detectable activity of137 Cs and134 Cs in biological gray samples were 0.068Bq and 0.098Bq.
2020 Vol. 41 (12A): 167-171 [
Abstract
] (
198
)
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260
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172
Study on the Performance of High-pressure Ionization Chamber for Environmental Radiation Monitoring
GUO Si-ming,HUANG Jian-wei,YANG Yang
DOI: 10.3969/j.issn.1000-1158.2020.Z1.31
Radiation environmental monitoring is an important part of ensuring radiation safety and public health. The high-pressure ionization chamber is usually used for radiation environment monitoring, and the five most common high-pressure ionization chambers in the domestic nuclear instrument market are selected for systematic experimental research. Experiments were conducted on its effective range, relative inherent error, energy response, overload characteristics, high and low temperature response, and vibration response. The research results show that the five high-pressure ionization chambers selected in the experiment can meet the needs of radiation monitoring. It can provide reference for nuclear instrument development unit.
2020 Vol. 41 (12A): 172-176 [
Abstract
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286
)
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533
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177
Natural Gas YuJi Pipeline Company, China Petroleum & Chemical Corporation, Jinan, Shandong 250101, China
JIANG Chen
DOI: 10.3969/j.issn.1000-1158.2020.Z1.32
The determination of total sulfur content in natural gas is to transport the on-site natural gas samples to the laboratory through the sampling steel cylinder. The ordinary sampling cylinder is easy to adsorb sulfide, while the passivated sampling cylinder can reduce the adsorption of sulfide. The adsorption of sulfide by passivated and ordinary steel cylinders is analyzed quantitatively by the ultraviolet fluorescence method, and the data are compared. The results show that the passivated sampling cylinder can hardly adsorb the sulfide, and the total sulfur content can be accurately analyzed by using it, while the ordinary sampling cylinder can adsorb the sulfide to a certain extent and follow certain adsorption kinetics, which makes the sample no longer representative, and the total sulfur content cannot be accurately analyzed by using the passivation sampling cylinder. It is recommended to use passivated cylinder for total sulfur content analysis.
2020 Vol. 41 (12A): 177-182 [
Abstract
] (
179
)
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(729 KB) (
127
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183
Application Analysis of GUM Method and Adaptive MCM Method in Uncertainty Evaluation of Seawater Salinity Measuring Instrument Calibration Device
WANG Peng-peng, ZHAO Shi-wei, LIU Yuan-yuan, MENG Wen-rong
DOI: 10.3969/j.issn.1000-1158.2020.Z1.33
The GUM method and the adaptive Monte Carlo method (adaptive MCM method) were used to evaluate the measurement uncertainty of the seawater salinity measuring instrument verification device, and the GUM method was verified by the adaptive MCM method. Four kinds of designs were also designed to verify the impact of the air buoyancy term. The results showed that the measurement uncertainty based on the adaptive MCM method was very close to the GUM method. The GUM method has been verified at each detection point, but the adaptive MCM method was simpler and more accurate, which provided a simple method for establishing military salinity standard; the estimated salinity error caused by the air buoyancy term was ±0.0003, and the uncertainty introduced was small. The reproducibility and environment of the seawater salinity measuring instrument verification device was an important part of the measurement uncertainty evaluation, especially for the measurement uncertainty evaluation of low salinity detection points, which had influence on the traceability of salinity.
2020 Vol. 41 (12A): 183-188 [
Abstract
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169
)
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(352 KB) (
182
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