Table of Content

15 August 2023, Volume 43 Issue 4

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Method for Analyzing Uncertainty of High Precision Ultrasonic Flowmeter for Main Feedwater

LIU Yan, WEI Hua-tong, BAI Tian, WANG Feng-ning, REN Da-cheng, LIU Li, CUI Xi-wei, GUO Lin

2023, 43(4):  1-7.  doi:10.12060/j.issn.1000-7202.2023.04.01

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The methodology of high-precision measurement of main feedwater flow is proposed based on Hualong No.1 and other nuclear power plants(NPP) to achieve measurement uncertainty recapture power uprates(MUR).The components of uncertainty measured by ultrasonic flowmeter such as calibration coefficient and medium density are quantified.Under the conditions with defining the structure and measurement principle of ultrasonic flowmeter and the complex operating conditions of high pressure and high temperature(HPHT),the uncertainty evaluation methodology of channel geometric factor and pipe cross-sectional area has been given respectively.By analyzing the influence of the operating conditions on the flow measurement,the uncertainty introduced by the flow field velocity has been evaluated.The analysis results indicate that the metrological traceability method which based on the combination of several uncertainty evaluation methods is feasible.

Development and Uncertainty Analysis of Heat Flow Field Calibration Device

ZHANG Jun-qi, LI Chen-yuan, LIU Bao-ju, ZHOU Ming-rui, WU Wei-wei, ZHAO Hua-ye, LIU Xin

2023, 43(4):  8-12.  doi:10.12060/j.issn.1000-7202.2023.04.02

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To meet the demand of field calibration of radiant heat flow measurement system,a heat flow field calibration device was developed based on high power semiconductor laser heat source generation technology.The composition of the heat flow calibration device and the design parameters of each component of the device is introduced.The optical analysis software is used to design the optical path of heat flow source.By analyzing each uncertainty component of the field calibration device and calculating the combined extended uncertainty,the extended uncertainty of 2.7% is realized by the device,which can meet the requirements of heat flow field calibration.

Development and Testing of Cavity Wide Spectrum High Absorption Standard

KANG Pin-chun

2023, 43(4):  13-16.  doi:10.12060/j.issn.1000-7202.2023.04.03

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In order to ensure the traceability of high absorption measurement,based on cavity absorber’s light trap effect,a cavity wide spectrum high absorption standard with absorption of 0.999 and spectral range of 300~1 100 nm is developed and tested.The absorption of cylindrical conical,spherical,and threaded cylindrical absorbers with different diameters were designed and simulated by Fred software based on Gouffe and Monte Carlo methods.Two sets of aluminum alloy cavity absorber with different inner wall materials of aviation black paint and electroplated nano coating were made and tested，their absorption analysis of different cavity shapes and sizes is given.Result shows that the opening diameter of the cavity is 25 mm,the inner wall coating is aviation black paint or nano copper with an absorption of 0.970,the absorption of the cylindrical conical cavity and the spherical cavity absorber is higher,and the average absorption in 300~1 100 nm is above 0.999.

Design of Calibration Control System for Attitude Control Engine Thrust Stand Based on Electromagnetic Automatic Loading

ZHANG Tian-liang, YAO Na, WANG De-zhi

2023, 43(4):  17-21.  doi:10.12060/j.issn.1000-7202.2023.04.04

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Thrust is a key index for reflecting the performance parameters of attitude control engine.Accurate calibration of thrust test system is the premise of accurate measurement of thrust vector,and improving the automation of calibration system is an urgent problem to be solved.A thrust test platform for attitude control engine using electromagnetic levitation technology is introduced in detail,and an electromagnetic automatic loading calibration system for thrust test sensors is designed.The test results are showed by the simulation which the system can realize multi-return automatic calibration that meets the accuracy requirements,the automation of the system is improved effectively,and the efficiency and accuracy of calibration are improved.

Research on Effect of RRT on Industrial Photogrammetry Scale-bar Accuracy

WANG Wei-feng, QI Jian-wei, HUANG Gui-ping, WANG Xin-ping, LIU Yan-rong

2023, 43(4):  22-30.  doi:10.12060/j.issn.1000-7202.2023.04.05

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In response to the problem of large deviation between measured values and calibrated values,as well as inaccurate proportion scaling of industrial photogrammetric scale-bar in actual engineering,a benchmark length error model was derived using retroreflective targets(RRT) as the research object.Experimental research was conducted on RRT roundness,centering robustness,consistency of scale-bar length calibration,and standard length testing.The results showed that the roundness and centering robustness of the die-cutting coated RRT were much higher than other types of RRT.The repeatability of length calibration of the die-cutting coated RRT scale-bar was 1μm,which was better than the repeatability of length calibration of the printed RRT scale-bar.The measurement error of the standard length using the die-cutting coated RRT scale-bar was about 33% smaller than that of the printed RRT scale-bar.Therefore,selecting die-cutting coated RRT as the benchmark target for the scale-bar has important reference significance for improving the measurement accuracy of industrial photogrammetric systems.

Comparative Study on Spectral Classification Methods and Properties of Aluminum Alloy Samples

ZHANG Yu-gang

2023, 43(4):  31-40.  doi:10.12060/j.issn.1000-7202.2023.04.06

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Aluminum alloy is widely used in industrial manufacturing by virtue of its excellent characteristics,for which a lot of waste aluminum alloy is produced.In addition,the new production of aluminum alloy would consume a lot of energy and cause environmental pollution.Therefore,recycling waste aluminum alloy play a very important role,which requires to find an efficient classification method to recycle aluminum alloy.Based on laser-induced breakdown spectroscopy(LIBS),a surface component detection technology,the spectral information of aluminum alloy surface components was collected.Then,combined with ELMAN neural network,artificial neural network(ANN) and random forest(RF) model,the series classification and brand classification of aluminum alloy were carried out for the full spectral data and characteristic spectral line data.The results show that 6 series and 11 brands of aluminum alloy can be classified more quickly and accurately by LIBS combined with RF model.The results provide a reference method for the rapid classification of waste aluminum alloy series and brands.

Analysis for Impact of Motor Control Algorithms on Navigation Accuracy in Rotating Inertial System

LIANG Hong-tao, WANG Yi-bing, ZHU Yan-ping, REN Hui, HE Xu-long

2023, 43(4):  41-47.  doi:10.12060/j.issn.1000-7202.2023.04.07

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With higher requirements for accuracy,rapidity and endurance on navigation system used in stationary and marine plant,rotating inertial navigation has become one of the most important technical strategies that can fulfill these requirements.Indexing accuracy,acceleration and deceleration smoothness,and launch speed of the indexing mechanism in rotating inertial navigation are the key factors which will affect the precision of posture demodulation.According to the characteristics of initial alignment,index modulation and posture demodulation,analysis indicates that rotating inertial navigation demands for smoothness of speed and controllability of acceleration.The influence of the segmented speed control method and S-curve method on the navigation accuracy is analyzed.Simulation and experiments show that the smoothness of speed and controllability of acceleration and deceleration during rotation procedure,improvement of rotation precision and symmetrical process of acceleration and deceleration is achieved,and the adverse effect on the reliability of motor brought by excessive speed overshoot is avoided.

Characteristics Optimization and Numerical Simulation of Pendulous Capacitive Tilt Sensor

WANG Fu-qian, YIN Yong

2023, 43(4):  48-53.  doi:10.12060/j.issn.1000-7202.2023.04.08

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In order to study the output characteristics of the pendulous capacitive tilt sensor taking into account the transverse edge effect of the sensor electrode,by combing theoretical analysis with computer numerical simulation,the electric field of the tilting capacitance inclination sensor is discussed by using conformal transformation method,Green function method and software MATLAB,the distribution of the static electric field is obtained in the sensor,and the relationship between its capacitance and angular displacement is given.The variation curve between the capacitance of the sensor and its angular displacement is drawn,and the factors affecting the linearity and sensitivity of the sensor are analyzed.The numerical simulation results show that increasing the area of the sensor electrode,reducing the distance from the upper end of the electrode to the suspension point or fixed point,and moderately increasing the angle between the two fixed electrodes can improve its linearity and sensitivity,and optimize the output characteristics of the sensor.

Research on Detection Technology of Carbon Fiber Ring Frame

LIU Jia, YU Zhu, MENG Fan-bo, YANG Wu-bing, LI Ying

2023, 43(4):  54-58.  doi:10.12060/j.issn.1000-7202.2023.04.09

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The excellent material properties of toughened epoxy carbon fiber increase its proportion in the main load-bearing structure in the aerospace field continuously.At present,in the aerospace field,composite processing capability has become one of the important indicators of progressiveness of aerospace manufacturing enterprises.In order to meet the development situation of aerospace,the inspection technology methods and results are summarized and analyzed in the macro and micro fields of parts.The research results can provide technical data and reference for the manufacturing of China’s aerospace carbon fiber load-bearing parts.

Design and Application of Muti-thread Architecture for Fast Test Data Post-processing

JIANG Yue, CHU Hou-bin, ZHANG Li-ye, CAI Fei-hua, LI Zhi

2023, 43(4):  59-65.  doi:10.12060/j.issn.1000-7202.2023.04.10

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In the test data post-processing,the single-thread data post-processing parsing method easily causes to the main thread block,with a low efficiency.In order to improve the parsing efficiency,a muti-thread processing method based on data decomposition is proposed.The data to be processed is divided into multiple independent data blocks,and then each core processes different data blocks for format processing and file writing respectively.The full potential of multi-core computer can be realized to complete data post-processing,which can shorten the post-processing time and improve the utilization rate of computer resources.In this way,the detailed data results can be given as soon as possible after test,to support the data interpretation.

Review of Dynamic Data Processing Methods for Engine Test

LIU Zi-xing, Gao Jun, SONG Jiong-liang, LIN Meng, YANG Yi

2023, 43(4):  66-74.  doi:10.12060/j.issn.1000-7202.2023.04.11

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Engine test dynamic data usually contains important information such as vibration and pulsating pressure of key parts,which is an important reference index for evaluating engine performance,component characteristics and optimal design.The advantages and disadvantages of several methods suitable for dynamic data processing are summarized,such as fast Fourier transform,wavelet analysis,wavelet packet analysis,Hilbert-Huang transform,and the application of these methods and their combination in dynamic data analysis and processing are introduced.

Design of Portable Telecontrol Telemetry and Data Transmission Test Equipment Based on ADRV9009

ZHANG De-zhi, LI Jin-long, SONG Zhao-han

2023, 43(4):  75-80.  doi:10.12060/j.issn.1000-7202.2023.04.12

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The commonly used TT&C test equipment adopts a standardized case with a shelf structure,which has problems such as large size,heavy weight,difficult disassembly,and inconvenient to field test.To solve these problems,a portable telecontrol telemetry and data transmission test equipment based on Zynq7100+ADRV9009 is designed.The design architecture,hardware scheme and software configuration flow of the equipment are given,and the wireless transmission link is reviewed.The results of system test show that the portable TT&C equipment has the characteristics of small volume,light weight and stable operation,and can meet the requirements of aircraft telecontrol telemetry and data transmission links field test.

Design of Dynamic Characteristics Test System for Air Rudder Transmission Mechanism

CHEN Hua-wei, WANG Chen, ZHOU Tian-song, GUO Jia, YANG Shun-bo, ZHANG Hong-jian, GAI Yu-xian

2023, 43(4):  81-85.  doi:10.12060/j.issn.1000-7202.2023.04.13

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Air rudder is widely used in all kinds of aircraft to control the aerodynamic characteristics during flight.The air rudder transmission mechanism is a kind of mechanism that connects the steering gear and the rudder surface and transmits the movement,which is the key point of the rudder surface control.In order to explore the dynamic characteristics of air rudder transmission mechanism,a new test system and test method for dynamic characteristics of air rudder transmission mechanism are proposed,which provide support for the research of dynamic characteristics of air rudder transmission mechanism.

Discussion on Construction of Aerospace Model Metrologist System

FENG Zhi-jun, MIAO Chun-lin, LIU Dan-ning, DU Jun-peng, ZHOU Kai, LIU Kai

2023, 43(4):  86-89.  doi:10.12060/j.issn.1000-7202.2023.04.14

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Aerospace model engineering is a large-scale，comprehensive and complex system engineering，as the technical basis of model development，the level and efficiency of model development is improved by metrology.Combined with the content of metrology in the aerospace model development workflow,the necessity of model metrologist system construction is analyzed,the idea of building the model metrologist system is put forward，the specific composition and main responsibilities of the model metrologist system is studied，the significance of establishing a model metrologist system is analyzed.The construction method of the aerospace model metrologist system will be referenced for all military industries.

Thinking on Promoting Transformation of Space Metrology Technology Achievements

ZONG Lei, HE Suo-chun, LIU Dan-ning, WANG Jing-ru, YANG Fan, SONG Jing-qi, CUI Jun

2023, 43(4):  90-94.  doi:10.12060/j.issn.1000-7202.2023.04.15

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As an important part of scientific and technological innovation,the transformation of scientific and technological achievements is a key link to combine basic and applied research of science and technology with market demand,and it is also an important engine for innovation-driven development in the new era.On the basis of grasping the current status of the transformation of scientific and technological achievements,the challenges and opportunities faced by the transformation of technological achievements in space measurement are analyzed.In terms of tackling key problems in core technologies,exploring modes of transformation,establishing innovative operation mechanisms,building demonstration platforms,and assessing and evaluating transformation,countermeasures and suggestions were put forward to accelerate the transformation of space metrology technology achievements,thus providing strong support for the development of the space industry and national economic construction.