Table of Content

25 December 2019, Volume 39 Issue 6

Previous Issue    Next Issue

Study on Three-dimensional Pose Measurement Method with Monocular Vision

YUAN Yuan, LIU Ke, SUN Zeng-yu, GAO Yue, LIU Hua

2019, 39(6):  1-6.  doi:10.12060/j.issn.1000-7202.2019.06.01

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Aiming at the pose measurement of monocular vision based on the point characteristics, the algorithm which uses non-coplanar five coded targets is studied. The system uses the high resolution camera with large target surface which can record the pose images of a moving object, then, using the geometric constraint relations of the encoded targets in target object and the orthogonal iteration algorithm, it can realize the pose measurement of the object. The experiment result shows that the displacement uncertainty of measurement is less than 0.5mm and the pose angle uncertainty of measurement is less than 0.05°, and it can meet the measuring demands in aeronautic and aerospace engineering.

Stereo Matching Algorithm Based on Angle Check for Large Scene Depth Range

WANG He-ying；ZHANG Ming-zhi；GUO Jing；ZHOU Jing；LI Peng；ZHANG Yu；WANG Shun

2019, 39(6):  7-13.  doi:10.12060/j.issn.1000-7202.2019.06.02

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Aiming at the problem of marker mismatching increasing in large scene depth range during the development of three-dimensional scanning system, the stereo matching algorithm based on homography constraint is studied. The mathematical relationship between matching error and the ratio of scene depth to working distance is deduced theoretically, and the applicable conditions of the algorithm are clarified. In order to improve the matching accuracy when the ratio of scene depth to working distance is large, a stereo matching algorithm based on angle checking is proposed. First, the initial matching point pairs are obtained by epipolar constraint, and then the correct final matching point pairs are obtained by angle difference checking. Experiments show that the proposed method can achieve better matching effect.

Research on Life Prediction Model of Spacecraft Wire and Cable

PAN Jiang-jiang；JIANG Shuang；LI Hai-wei

2019, 39(6):  14-18.  doi:10.12060/j.issn.1000-7202.2019.06.03

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

With the rapid development of complex large-scale spacecraft systems and the wide application of electronic products on spacecraft, wires and cables are widely used in power transmission and signal control between different systems. In order to solve the problem of cable aging and other electrical faults caused by space layout restriction, overlapping, vibration, temperature, space radiation and other external environmental effects during spacecraft operation, the method of establishing life model based on measurable characteristic parameters is introduced, the prediction model of cable residual life has been obtained, the research on the aging mechanism and life prediction model of spacecraft cable are carried out , and finally the ability of cable life prediction of spacecraft equipment is realized.

Uncertainty Evaluation of Positive-pressure pVTt Gas Flow Standard Facility

SUN Feng-ju；WANG Hui-long；WANG Guang-ming；BAI Tian；Li Tie-peng

2019, 39(6):  19-25.  doi:10.12060/j.issn.1000-7202.2019.06.04

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Based on the design principle of the positive-pressure pVTtgas flow standard facility, the uncertainty source, evaluation method and process of each standard uncertainty are analyzed. Meanwhile, the evaluation result of the expanded uncertainty is compared and analyzed.

Simulation Study on Flow Coefficient of Orifice Used in Pressurizationtank

WANG Hui-long；ZHANG Yu；SUN Feng-ju；JIAO Xin-xin；LIU Xin

2019, 39(6):  26-30.  doi:10.12060/j.issn.1000-7202.2019.06.05

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Numerical simulation simulation method is one of the effective methods of studying the characteristics of fluid flow field, the means of fluid simulation is used, according to the simulation data, the suitable turbulence model is found out to calculate the orifice discharge coefficient, through the simulation of equivalent diameter, combined working conditions is the same orifice flow field distribution, the experimental data is analysed and the curves of flow coefficient are fitted,it has the certain reference value for the actual flow test.

Research on the Calibration Technology of Temperature #br# Sensor Based on Uniform Rise and Drop Excitation Method

CHEN Yi-qing；CUI Wen-de；PEI Ya-peng；WANG Kuo-chuan；LIU Hao

2019, 39(6):  31-36.  doi:10.12060/j.issn.1000-7202.2019.06.06

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

For quick and convenient temperature calibration of the temperature sensor, a new calibration technique of temperature sensor is introduced, the calibration device is designed based on this calibration technique, the design structure of calibration device is optimized by numerical thermal analysis, the influence of the uncertain component of the calibration furnace on the calibration results is analyzed. The results meet the current needs of temperature sensor calibration. The method of uniform rising and cooling excitation for rapid calibration is novel and innovative in measurement, the maturity and application of this technology provided a new and efficient calibration method technical approach for temperature measurement.

Development of a Kind of Liquid Level Sensor Based on #br# Resistance Method and the Calibration Device

LIU Yi；WU Jia-ling；WU Dong-jian；REN Da-cheng

2019, 39(6):  37-42.  doi:10.12060/j.issn.1000-7202.2019.06.07

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

A kind of liquid level sensor measurement system based on resistance method is designed, which includes the fothputting level sensors, point level sensors, depleted shutdown level sensors, residual level sensors and the corresponding transmitters. The corresponding semi-automatic calibration system is designed to calibrate the accuracy of the sensors. And the uncertainty of the measurement results is analyzed. Test results show that all the indicators of the sensors meet the design requirements. The development of the measurement system solves the problem that the volume and height of different parts of the tank can’t be detected in the current volume measurement and hydraulic test system.

Research on Generator Voltage Control Technology Based on AD736 True RMS Measurement

LIN Yang；FENG Jing-jing；LI Chao；SONG Sheng-zhuang

2019, 39(6):  43-47.  doi:10.12060/j.issn.1000-7202.2019.06.08

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

The voltage control technology of electric excitation synchronous generator has some shortcoming such as parameter drift, unstable workflow and voltage distortion. Which lead to the over-tolerance of control parameters, etc. In order to solve the above-mentioned problems, a digital voltage control technology for electric excitation synchronous generator is introduced. Which measures the True RMS Measurement through AD736 high precision chip, and develops the Generator Voltage Digital Controller through the voltage control technology based on double closed-loop digital PI algorithm. Finally the performance index of the controller has meeted the design requirements, and the anticipated design goal has been achieved after test and verification by experiments.

Design and Simulation of Wideband and Dual-polarized Antenna Measurement Probe

XIE Wen-jia；ZHOU Tian；HONG Tao；SONG Xiao-feng

2019, 39(6):  48-51.  doi:10.12060/j.issn.1000-7202.2019.06.09

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

The performance of the antenna measurement probe is of great significance for improving the efficiency of Planar Near-Field measurements and the accuracy of the final measurement result. Need for Planar Near-Field measurements, a wideband dual-polarized antenna measuring probe was designed using reverse quadrilateral and differential feed techniques. The measurement probe was studied by simulation. The performance of the probes such as bandwidth, pattern, isolation and cross-polarization identification was analyzed, and the optimal design of wideband dual-polarized antenna measuring probe with high isolation and polarization purity was determined. The higher antenna efficiency measurement was provided.

Research on the Multipath Interference Suppression Method and Experiment Based on MARS

HONG Tao；GAO Yu-chen；JIANG Wen；GONG Shu-xi

2019, 39(6):  52-56.  doi:10.12060/j.issn.1000-7202.2019.06.10

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Multipath interference is a common environmental interference in antenna measurement. It is usually caused by the reflection of the test signal from the equipment near the antenna under test (AUT).To solve the problem of multipath interference in antenna calibration, mathematical absorber reflection suppression (MARS) technique is proposed to filter the antenna received signal, separate and filter the multipath interference components in the signal, and then reduce the multipath effect in the measurement environment.Relevant formulas are derived and the effect of the technique is verified in the antenna planar nearfield measurement system. In the experiment, corner reflectors distributed around the AUT is used as the reflection resources.The results show that this method can effectively reduce the influence of multipath effect in the measurement environment, and the average gain error in the maximum radiation direction of the AUT is less than 0.1dB, which improves the measurement accuracy of the antenna.

Analysis of Influence of Induction Synchronizer Pre-Processing #br# Analog Circuit Error on System Measurement Accuracy

LI Tai-ping；QI Xiao-jun；XIA Zhen-tao

2019, 39(6):  57-61.  doi:10.12060/j.issn.1000-7202.2019.06.11

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Based on the working principle of the induction synchronizer, the stability of the tracking angle measurement system is analyzed and verified. According to the simulation, the influence of the amplitude, phase and reference signal phase shift of the induction synchronizer on the measurement accuracy of the system is analyzed, and the theoretical error model is verified. The pre-processing circuit error formula is obtained.

Research of the Measurement Guarantee of Ship Instrument On-site

SONG Jian-bo；LIU Fang

2019, 39(6):  62-66.  doi:10.12060/j.issn.1000-7202.2019.06.12

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

The importance of measurement work and the problems faced by the on-site measurement support work of the ship instrument are analyzed. The design thoughts and the accordance of the measuring works on the installation site in the development stage of ship demonstration are discussed. Especially, on the main measurement factor, the environment temperature fluctuation of those harbors along the Chinese coast is explored. The feasibility of measuring the pressure gauges on the installation site , the measuring program and the measuring effects are all described.

Design and Key Process of Integration System of Engine Assembly and Inspection

LI Di；ZHAO Yuan；FANG Jian-guo；HAN Hai-tao；LIU Yong；XU Chang-yu

2019, 39(6):  67-72.  doi:10.12060/j.issn.1000-7202.2019.06.13

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

The integration system of engine assembly and inspection is introduced. A new technology of aerostatic bearing, which is the core part of the system, is developed. By using a large-scale optical processing machine tool, an optical aerostatic working surface is obtained, and a high-precision aerostatic rotary table is manufactured. On this basis, the integration system of engine assembly and inspection with high precision, high reliability, high usability and high customizable characteristics is developed, which breaks through the bottleneck of domestic aeroengine assembly process and equipment manufacturing technique. According to the assembly experiment of the compressor rotor, the accumulative radial runout error of the multi-stage assembly body is reduced by 46%, and the accumulative coaxiality error is reduced by 30%, which verifies the effectiveness of the assembly system and the assembly process.

Research on Satellite Rapid Test Technology Based on Built-in Self-testing

YANG Tong-zhi；YAN Jun；LIU Ting-yu；DANG Jian-cheng

2019, 39(6):  73-76.  doi:10.12060/j.issn.1000-7202.2019.06.14

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

Traditional satellite design focuses on function implementation and lacks the consideration of testability. Satellite integrated test relies on telemetry and command. The test cycle is long, the test efficiency is low and the cost is high. The traditional test mode can′t adapt well to the needs of satellite batch manufacture. Based on satellite testability and built-in self-test which refers to the technology of rapid electrical test for civilian vehicles, the satellite rapid test system is designed to meet the needs of the low cost and efficient manufacture based on bus scheduling, which can upgrade satellite rapid maintenance and rapid launch capability.

Experimental Study on Focusing Evaluation Functions of Images of Film Cooling Hole

BI Chao；HAO Xue；LI Jian-fei；FANG Jian-guo

2019, 39(6):  77-83.  doi:10.12060/j.issn.1000-7202.2019.06.15

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

 functions is executed. Firstly, characteristics and requirements which are necessary for a well qualified focusing evaluation function are analyzed, as well as the advantages and disadvantages of typical functions. In this procedure, the gray gradient functions are selected to evaluate the sharpness of image sequence. Afterwards, 5 representative gray gradient functions such as Brenner gradient function, Tenengrad gradient function and Laplacian gradient function etc are investigated by experiments, in which their function curves are derived and then normalized to carry on comparisons and analysis. Finally, Laplacian gradient function is chosen as the focusing evaluation function of the system, whose repeatability is verified by experiments. As the experimental results show, Laplacian gradient function could be utilized to determine the focusing position of the target film cooling hole and the focusing repeatability is smaller than 0.005mm, which could satisfy the inspecting requirements of the film cooling holes.

Design of the Image Compression System

WANG Bing；BAI Zhi-fu；ZHANG Xiu-jian；YIN Zhao-hui；ZHANG Tie-li

2019, 39(6):  84-89.  doi:10.12060/j.issn.1000-7202.2019.06.16

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

The image compression system based on FPGA+DSP architecture is introduced, and its system structure, principle and implementation are described. The system uses FPGA+DSP architecture to establish a high-performance image real-time compression device. The terms of system hardware, software and mechanical structure are optimized design, the functions of the multi-channel video image capture, compression, transmission, and time series conversion are realized to meet the flight test environmental conditions. The system has the advantages of small delay, low power consumption, good environment adaptability. The system passed some environmental test including high and low temperature test, vibration and shock test, electromagnetic compatibility test, and has a high application value.

Research on Assisted Navigation Test Method Based on Simulator

PENG Ming；WANG Tian；XUE Ren-kui；YANG Wen-bin；WU Xin-bo；HUANG Zi-tao

2019, 39(6):  90-93.  doi:10.12060/j.issn.1000-7202.2019.06.17

Asbtract ( )   PDF (19381KB) ( )  

Related Articles | Metrics

With the rapid development of the satellite navigation industry, assisted navigation technology is getting more and more widely used. This technology can improve the capture probability of the navigation terminal to the satellite navigation signal, shorten the first positioning time, improve the sensitivity, and improve the user experience. It builds an assisted navigation test system based on the navigation signal simulator and the method of transmitting auxiliary data (ephemeris information and time information) by the base receiver. A new assisted navigation test method is proposed, which fully verifies the navigation chip's use of auxiliary information to achieve fast capture and positioning performance. This method is feasible and has some value in engineering application.