Table of Content

25 April 2020, Volume 40 Issue 2

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Development Status and Analysis of Time Constant Testing Techniques for Thermal Sensors

LI Cheng-hao, LIU Xian-ming, ZHANG Peng, LEI Xiao-hua, CHEN Wei-min

2020, 40(2):  1-7.  doi:10.12060/j.issn.1000-7202.2020.02.01

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The development of time constant testing technology of temperature sensor in recent years has been summarized,including working principles,structures of system and research results.According to the characteristics of heat source and testing device,the existing testing methods are classified,and the advantages and applicability of different testing methods are pointed out.Based on the development trend of miniaturization and high-speed of temperature sensor,the attention and development direction of dynamic response testing technology are proposed combined with the development needs of the industry.

Review on Developments of Microwave Medium-power Measurement

WEN Shi-ren, HAO Zhi-kun, ZHANG Zheng-long, WANG Li-juan, YANG Jing

2020, 40(2):  8-13.  doi:10.12060/j.issn.1000-7202.2020.02.02

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The principle and developments of two typical methods for microwave medium-power measurement,couplers & attenuators method and calorimetry method are introduced，and their respective characteristics are summarized.It is pointed out that calorimetry method has more advantages in high accuracy measurement and can be one of the research directions in establishing microwave medium-power measurement standard.

Research on Calibration Technology for Thermal Protection Material Special High Temperature Sensor

ZHAO Hua-ye, PEI Ya-peng, ZHANG Jun-qi, LIU Hao

2020, 40(2):  14-19.  doi:10.12060/j.issn.1000-7202.2020.02.03

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Special high temperature sensor is widely used in the field of thermal protection materials.Because the temperature measurement part is shorter than the general temperature sensor,the established calibration devices cannot meet the calibration requirements.For the problem that the special high temperature sensor cannot be calibrated,a calibration method based on comparison and the special high temperature furnace is put forward,and the calibration device of special high temperature sensor is developed.The traceability of the temperature sensor is realized and the uncertainty analysis is carried out.

Design and Realization of Sweeping Frequency Absolute Pressure Calibration Device

ZHANG Da-you, WEN Shi-ren, SUN Feng-ju, WU Dong-jian, JIAO Xin-xin

2020, 40(2):  20-24.  doi:10.12060/j.issn.1000-7202.2020.02.04

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A new sweeping frequency absolute pressure calibration system for dynamic pressure calibration of under atmosphere is described.This system can generate not only sine absolute pressure wave,but also sweeping frequency absolute pressure wave.It can be used to calibrate the amplitude and phase of absolute pressure sensor at giving frequency or at giving frequency range.The working frequency range of this system is(1～5000)Hz,and working pressure range is(1～200)kPa.

Evaluation of Uncertainty in Measurement for the Firing Dispersion Extent Test with the Vertical Target Test System

QIAO Yong-sheng, LI Yun-ling, REN Shao-qing, ZHANG Li-ping, QIAO Hui-ying, GAO Jun-wen, BAN Yue

2020, 40(2):  25-29.  doi:10.12060/j.issn.1000-7202.2020.02.05

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The digital vertical target test system based on CCD is a non-contact test method.A method of using visual calibration to analyze coordinate results is proposed.The synchronous radar trigger and CCD imaging are introduced,and a kind of test system of vertical target test results is obtained through image analysis.In order to improve the measurement results of the digital vertical target test system based on CCD,the measurement model is established,and the uncertainty components is analyzed according to the visual calibration method and system structure etc.

Identification of Sealed Relay PIND Signal Based on Multilayer Perceptron

2020, 40(2):  30-35.  doi:10.12060/j.issn.1000-7202.2020.02.06

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A set of aerospace sealed relay signal detection method is designed based on the Particle Impact Noise Detection(PIND) method and several representative features are selected by analyzing the time domain and frequency domain of the signal.By applying the machine learning method and using multi-layer perceptron as well as super-parameter optimization,the optimal hyper-parameter combination is found.The signal is processed and analyzed to determine if there is any excess in the sealed relay.The accuracy of the classification is improved,and the overall performance of the model is also improved.

Improvement of Bundle Adjustment Orientation Model based on Theodolite

WANG Wei-Yao, YOU Zhi-Wei, HUANG Jian

2020, 40(2):  36-42.  doi:10.12060/j.issn.1000-7202.2020.02.07

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To improve accuracy of bundle adjustment model used in theodolite industrial measurement system,a new orientation method is devised based on mutual collimation model and bundle adjustment model.In this method,new constraints are established to reduce accumulated datum point measurement errors.After a simulation experiment,our finding indicates that this method has maintained the orientation accuracy of 0.1 millimeter with sighting error smaller than 3 arc seconds within 10 meters under intervisibility difficult condition.

Synchronous Trigger Measurement and Control System of NC XY Worktable Based on DSP

YANG Hong-tao, GU Jia-hui, JIANG Lei, LI Li

2020, 40(2):  43-49.  doi:10.12060/j.issn.1000-7202.2020.02.08

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In order to verify the error compensation effect of NC(numerical control) XY worktable under the influencing multiple factors,it is necessary to design a measurement and control system that can realize real-time acquisition and synchronous trigger of temperature,motion speed,X/Y coordinate position and standard quantity for compensation experiment verification.The measurement and control system that can realize the synchronous triggering and real-time acquisition of the worktable motion speed,temperature,grating scale and inductance micrometer is introduced.The numerical control XY worktable is taken as the research object,the inductance micrometer is used as the displacement standard of the worktable,DSP is used as the main control chip,and the experimental device is built for real-time acquisition,synchronous trigger and comparison experiments，measurement error and measuring repeatability error experiments.The experimental results show that the designed measurement and control system can achieve the preset target,which can realize the comparison between the displacement of the numerical control XY worktable and the standard quantity under different influencing factors,and verifying the error compensation effect of XY worktable.The researched results can be lay a foundation for the future error compensator researching of the CNC on-machine measurement systems.

Study on the Influences of Transmission Ratio and Rotating Speed on Transmission Characteristics of Permanent Magnetic Gear

XIAO Lei, ZHANG Hai, XU Bao-yu

2020, 40(2):  50-56.  doi:10.12060/j.issn.1000-7202.2020.02.09

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A radial modulating Permanent Magnetic Gear(PMG) is introduced.In order to obtain the influences of the transmission ratio and the rotating speed on the output torque and the efficiency of the PMG,Finite Element Analysis(FEA)was applied by changing the simulation conditions of the transmission ratio and the rotating speed,as well as by analyzing the simulation results of the output torque and the efficiency.The results showed that the output torque varied with the transmission ratio in a quadratic manner,the efficiency decreased with increase of the transmission ratio.Under the same transmission ratio,both the output torque and the efficiency decreased with increase of the input rotating speed.The concept of equi-efficiency curve with transmission ratio(i) versus input rotating speed(n₁)is proposed,the curve of the efficiency(η=90%)is given,if the crosspoint of n₁ and i locates below the curve,efficiency(η>90%) could be obtained.

Multi-Cycle Error of the Interference Rolling Shafting

SUN Fang-jin, WANG Lei, ZHANG Zhong-wu, WANG Zhen

2020, 40(2):  57-60.  doi:10.12060/j.issn.1000-7202.2020.02.10

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The forming mechanism of the“multi-cycle error”of the interference rolling shafting is analyzed by explaining the law of the revolution of the rolling body.The calculation method of the multiple-cycle error is analyzed,and the correctness of the method is verified by experiments.The cycle of the multiple-cycle error is determined by the geometrical dimension of the component of the interference rolling shafting.Improved the roundness of the shaft,the hole and the rolling body,especially the roundness of the rolling body,the shafting rotation error can be reduced.

High Fidelity System Design for Satellite Power and Load Scene Reappearance

YANG Tong-zhi, LIU Ting-yu, ZENG Qi, DANG Jian-cheng

2020, 40(2):  61-65.  doi:10.12060/j.issn.1000-7202.2020.02.11

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The satellite power and load fluctuate greatly on-period.The power and load scene reappearance is helpful for satellite power supply and distribution system performance test and fault debugging.But the method of using reality batteries and loads has the problems of safety and difficulty in rapid reconstruction.The system of the satellite power and load scene reappearance is designed,the high fidelity scene of external power source and internal power source and load can be recorded and reproduced,the satellite power supply and distribution scene is rapidly reconstructed,assists the satellite is tested and debugged.

Research on Parallel Transmission of Signal and Power Based on Secondary Impedance Modulation in CCPT System

LIU Chao, DAI Ming, ZHAO Yong, CAI Ping, JI Xiao-jun

2020, 40(2):  66-72.  doi:10.12060/j.issn.1000-7202.2020.02.12

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In order to solve the wireless power supply and signal transmission requirements in the metal environment，a wireless energy and signal parallel transmission scheme based on capacitively coupled power transfer is proposed.By establishing the mathematical model of the class E amplifier，analyzing the transmission characteristics and the impedance mechanism of the capacitive coupling system，a modulation and demodulation circuit suitable for the E-class amplifier structure is designed，and the feasibility of the circuit is verified by simulation，which provides theoretical guidance to energy transmission and signal return of CCPT system.

Discussion on Metrological Assurance of Aerospace Model

FENG Zhi-jun, PEI Ya-peng, YANG Rui-ya, MIAO Chun-lin, HOU Xiong

2020, 40(2):  73-76.  doi:10.12060/j.issn.1000-7202.2020.02.13

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Metrological guarantee is the basis of the quality of aerospace model missions，is related to the success or failure of model missions.The status quo and shortcomings of mission measurement for aerospace models is mainly introduced.The whole process of aerospace model missions is combined,the measurement suggestions in each link of the model tasks are be put forward.

Consideration on the Independent and Controllable Work of Metrological Equipment

CAI Ying

2020, 40(2):  77-80.  doi:10.12060/j.issn.1000-7202.2020.02.14

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The low localization rate of military measuring equipment restricts the independent and controllable work of military measuring equipment.For this reason, in view of the actual problems existing in the autonomous and controllable work of the localization of military measuring equipment, the ways to promote the autonomous and controllable work of military measuring equipment are discussed through the establishment of the autonomous and controllable demand docking mechanism of military measuring equipment.The technical standards of the system specifications are improved and the joint research mode is constructed.

Research on Structure Improvement Method for a Towing Length Measurement

LI Hong-quan

2020, 40(2):  81-84.  doi:10.12060/j.issn.1000-7202.2020.02.15

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Towing released length is an important parameter for a certain towing flight, if a failure occurs in measuring procedure, it will cause serious consequences. Aiming at the length counting loss phenomenon, the reasons of counting error are analyzed, from the structure principle, air force and flight process of the length measuring device. The structural improvement method and flight maneuvering route requirements are proposed. The effectiveness of the resolutions is verified by the actual flight.

A New Method for Determining Vibration Load of Aircraft Transportation

TONG Xiang-peng, HE Xu-long

2020, 40(2):  85-87.  doi:10.12060/j.issn.1000-7202.2020.02.16

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The problems in the physical transport test of aircraft were pointed out,a method using equal proportion model was also given.By explaining the basic principle and key points and using the test data fully,some suggestions for improving the aircraft anti vibration and shock ability were also given.

Analysis Method of Metrological Characteristics of Special Test Equipment

WEN Hai, ZHAI Qiao-li, QIN Xiang-qian

2020, 40(2):  88-92.  doi:10.12060/j.issn.1000-7202.2020.02.17

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In order to solve the problem of analyzing the metering characteristics of special test equipment and improve the effectiveness of metrological traceability,from the perspective of equipment users,based on the test ability,the system analysis method is applied to form the analysis method of metrological characteristics,including method train of thought,identification range,“metrological” principle,analysis steps and result expression,etc.Finally,taking the muzzle shock wave test system as an example,the application of the analysis method is described.The results show that this method is simple and feasible,which can not only provide support for the re-evaluation of metering characteristics of in-service equipment,but also provide a reference for the demonstration of new(or in-research) equipment.