Table of Content

25 December 2020, Volume 40 Issue 6

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Review of Digital Processing Techniques for Phase Signal in Absolute Distance Measurement

Xu Yongyao, Zhang Tieli, Gao Xiaoqiang, Zhu Yanni

2020, 40(6):  1-6.  doi:10.12060/j.issn.1000-7202.2020.06.01

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With the advent of the Industry 4.0, it's more and more significant to develop techniques of precision measurement. As an important part of precision measurement, absolute distance measurement is inseparable from the analysis for phase information. The phase information can be obtained by digital method. The principle and application of digital processing method of phase signal involved in absolute distance measurement of laser are introduced.

Inversion of Acoustic Source Level of Underwater Target Radiated Noise in Shallow Waters Based on Inverse Frequency Response Function Method

LIU Yucai, CHEN Yi , YI Wensheng, YANG Liuqing

2020, 40(6):  7-14.  doi:10.12060/j.issn.1000-7202.2020.06.02

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In order to solve the problem of high error in the measurement of underwater acoustic radiation of shallow water targets by traditional single hydrophone method or beamforming method, an inverse frequency response function(IFRF)based inversion of underwater sound source level method in shallow water is introduced.Based on the virtual source method, a calculation model sound field in shallow water is constructed and the basic principle of the inversion algorithm is described in detail. The feasibility and effectiveness of the algorithm are simulated and analyzed, and the verification experiments are carried out in the waveguide pool and the lake respectively. The results show that it is accurate and feasible to use IFRF method to invert the target underwater radiated noise source level in shallow water environment, and it has high inversion accuracy.

Study of Calibration Method on Heat Flux Sensor of the Thermal Resistance Mode

ZHANG Xiao-fei, MENG Xiang-jun, WANG Kuo-chuan, ZHANG Yu-chang, WU Chun-chan

2020, 40(6):  15-19.  doi:10.12060/j.issn.1000-7202.2020.06.03

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The application of heat flux sensors are introduced.The important significance of establishing calibration device of thermal resistance heat flow sensor is explained.The measurement principle and calibration method of heat flow sensor are discussed.The research status of protection hot plate method is summarized.The calibration device is designed, and realizes the accurate traceability of the value of the thermal resistance heat flow sensor.

Portable Low–frequency Vibration Calibration System for Field Service

ZHU Gang, YANG Xiao-wei, DAI Yi-lin, TIAN Jun-hong, CUI Zhong-liang

2020, 40(6):  20-24.  doi:10.12060/j.issn.1000-7202.2020.06.04

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For large Structure, the resonance frequency is very low and the model test system is complex with more test channels. A portable low frequency vibration calibration system for field service is introduced， the system has a frequency range from 0.1Hz to 20Hz and it was used in field calibration service for the model test system of large structures such as launch vehicle etc. Using this calibration system, the testing efficiency and measurement accuracy were significantly improved.

Research on Field Calibration Device of Gelled Propellant Viscometer

DOUShuangqing, JIAWanli, ZHANGHuijun, LIUYang, LILiang

2020, 40(6):  25-30.  doi:10.12060/j.issn.1000-7202.2020.06.05

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The field calibration of gelled propellant viscometer device for the liquid rocket engine is studied. The mechanical design and installation method of the gelled soakings filling device based on the vibration method is also described. The field calibration process flow of the online viscometer used for liquid rocket engine gelled propellant is emphasized. The pressure/temperature -viscosity data and regulation of gelled propellant were obtained by the test. The uncertainty degree of field calibration system is determined.

Stress Measurement Technology Based on 3D Digital Image Correlation Method

Yuan Yuan, Sun Zeng-yu, Wang Xing, Gao Yue , Liu Ke

2020, 40(6):  31-36.  doi:10.12060/j.issn.1000-7202.2020.06.06

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A model of the surface stress measurement system based on the three-dimensional digital image correlation method is introduced.Two high-speed cameras to synchronously collect the surface image of the tested model and the speckle on the model surface as the carrier is used, the tested model through the image sub-region stereo matching algorithm is matched.Different image sub-regions in the two speckle images before and after the model deformation are solved to obtain the three-dimensional coordinate values of different points on the model, and the three-dimensional deformation information of the model surface is obtained, and the non-contact, dynamic real-time stress measurement of the model surface is realized.

Measurement and Control System of Single Carrier Band TargetMachine based on TDD Protocol

YANG Liu-qing, ZHANG Yong, SUN Li-hui, XIAO Qian-gui,

2020, 40(6):  37-42.  doi:10.12060/j.issn.1000-7202.2020.06.07

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A single carrier frequency band target drone measurement and control system based on Time Division Duplex(TDD) protocol is designed to realize full Duplex communication when only one digital transmission station is equipped on both airborne and ground stations.The frame structure, frame synchronization, and communication realization of TDD protocol are described in detail.The requirement and performance of drone aircraft are analyzed and calculated.,the results show that the communication protocol is scientific and feasible.

Research on Data Analysis Method of Fluctuating Pressure in Liquid Rocket Engine Test

YANG Yi , JIAN Yue, JIA Zhi-jie, WANG Yong-peng, GUO Ya-nan

2020, 40(6):  43-50.  doi:10.12060/j.issn.1000-7202.2020.06.08

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According to the characteristics of fluctuating pressure data of liquid rocket engine test, fast Fourier transform(FFT) and wavelet transform are introduced in this paper. Through the fast Fourier transform(FFT)of the fluctuating pressure data and the related vibration data, the acoustic vibration type of the engine unstable combustion is effectively determined by the spectrum analysis results.Based on the wavelet transform singularity detection method, the abnormal fluctuating pressure data in the start-up and shutdown stages are analyzed.Combined with the frequency spectrum information of relevant vibration measurement points, the singular point position can be accurately located in the time domain, and the information in the frequency domain can be extracted to effectively judge the burning condition and acoustic vibration type of propellant.The analysis results show that the above methods can be widely used in the analysis of fluctuating pressure data of other type tests of engines and assemblies.

Research on Data Collection System of Aircraft Telemetry Parameters Based on Master-Slave Redundant Nodes Architecture

Chen Yukun, Liang Jun, Rong Gang, Zeng Fa, Li Kai

2020, 40(6):  51-56.  doi:10.12060/j.issn.1000-7202.2020.06.09

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A special data collection system for aircraft was developed based on master-slave redundant nodes architecture. Dual hot standby redundant architecture was adopted in the central node, and control right can be switched rapidly when fault happens, the reliability and reconfiguration can be achieved. Power modules and signal collection modules of acquisition and coding unit were integrated, and then the complexity and weight of electric cables can be decreased. The experimental results indicate that the collection system can meet the demands of isolated acquisition and transmission and fault isolation. The data collection system has engineering application value for data acquisition and transmission with high reliability and accuracy.

Stereo Vision Dynamic Measurement Technology of the Deploying Process of Spaceborne Antenna

GAO Yue, SUN Zeng-yu, YUAN Yuan, CUI Zhong-liang

2020, 40(6):  57-63.  doi:10.12060/j.issn.1000-7202.2020.06.10

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A method for monitoring the dynamic deployment process of a spaceborne antenna based on the principle of stereo vision is introduced. Through the research of key technologies such as the calibration method based on standard length, the calculation of binocular stereo vision intersection coordinates and dynamic multi-target recognition and tracking, the measurement of the three-dimensional motion trajectory of each joint point of the deployable antenna during the unfolding process was realized, and experimental verification was obtained. The three-dimensional point coordinates of each joint point at different times, and surface shape at the unfolding movement of the spaceborne antenna can be obtained by this method, also the motion speed and acceleration, and surface ship of deployment can be calculated. Necessary references for the design, dynamic analysis and deployment reliability analysis of the flexible mechanism of the large-scale deployable antenna are provided.

Launch Vehicle Docking Assembly Measurement and Adjustment Technology Based on Laser Scanning

Wang Jin, ZHU Yanni, Wu Huayang, Chen Baoyou, Zhang Xuewei , Cui Yun

2020, 40(6):  64-68.  doi:10.12060/j.issn.1000-7202.2020.06.11

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Aiming at the high precision and high efficiency assembly requirements of a particular launch vehicle for horizontal and vertical docking, a method of using large-size non-cooperative target 3D morphological measuring instrument to assist docking is propsosed. The measurement of point cloud data in the segment of the launch vehicle segment by laser scanning is carried out, the shape of the launch vehicle’s butt surface is calculated, the position parameters are adjusted by feedback to the docking actuator. Theoretical analysis and experimental verification show that this method can effectively improve the accuracy and efficiency of docking assembly.

Research on Calibration Method of the Cross Structured Light Sensor

Bi Chao, Hao Xu, Zhou Peng

2020, 40(6):  69-75.  doi:10.12060/j.issn.1000-7202.2020.06.12

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According to the principle of 3D vision measurement based on structured light, a non-contact cross structured light sensor was established. In order to derive the 3D coordinates of the sample points on the projection strips, the mathematical model of the sensor was set up and the calibration method of its structural parameters was studied. Using a checkerboard and the camera calibration method proposed by Zhang Zhengyou, the structural parameters of the sensor were calibrated and then verified by measuring experiments, in which the mapping relationship between the 2D image coordinates and the 3D world coordinates of the measured target was determined. As the experimental results showed, the calibration results derived by the method proposed could ensure the realization of the intended 3D measurement function of the sensor and the repeatability accuracy of the normal vector at the drilling position of aircraft surface could meet the inspecting requirements.

Research on Electromagnetic Force Measurement System

GE rei, WANG Xiaosan, SUN Fengju, CUI Zhongliang

2020, 40(6):  76-81.  doi:10.12060/j.issn.1000-7202.2020.06.13

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The analysis and optimization of static magnetic field in the electromagnetic force measuring system, the position control method of electrified coil and the calibration method with improved linearity are introduced. The Maxwell 3Dis used to do simulation, a relatively optimized magnetic density and magnetic uniformity are obtained. And the accuracy of electro magnetic force measurement is improved by controlling the position of the electrified coil in the magnetic field as well as using the piecewise linear differential technology. A test device is constructed, and the comparison with the test data shows that good results have been achieved in improving the accuracy of electromagnetic force measurement.

Discussion on Standardized Management in Metrological Work under New Situations

WU Chunchan, ZHU Yanni, YANG Jing, REN Hui, CUI Zhongliang

2020, 40(6):  82-85.  doi:10.12060/j.issn.1000-7202.2020.06.14

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The development status of domestic metrological verification work is analyzed, the shortcomings of standardization work is depth analyzed.the relevant excellent cases and future market development trend is consulted, more targeted improvement suggestions are formulated.