Table of Content

25 December 2017, Volume 37 Issue 6

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Precision Measurement Technology Research and Application of Higher Curved Surface Shape for Large Structure

CUI Shen-shan； WAN Shuang；ZHANG Tao

2017, 37(6):  1-5.  doi:10.12060/j.issn.1000-7202.2017.06.01

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In order to complete the high-precision measurement of the high-profile surface of large-scale structure, the method of laser scanning and visual hand-held measurement was used to extract the full contour point cloud data. The data fusion scheme is given and the measurement system is completed. Contrasting the theoretical surface of the aircraft as the datum plane with the measurement results, the measurement results show that this technique can be applied to the measurement of large space structure′s high-profile surfaces.

Study of the Hudrostatic Gasbearing Shafting Rotary Precision Measurement Method

JIANG Yun-xiang；FENG Wei-li；WANG Chun-xi；HUANG Shi-jun；ZHAO Tian-cheng

2017, 37(6):  6-10.  doi:10.12060/j.issn.1000-7202.2017.06.02

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Based on the analysis of the working principle of aerostatic shaft and the analysis of the accuracy of the gas bearing shafting, a method for measuring the static pressure of the drostatic gasbearing shafting was presented. A measuring device was designed, and the measuring software was developed. The uncertainty of the measurement result was analyzed. Finally the rotation accuracy of the static pressure gasbearing shafting with space turning motion was measured. The experimental results show that the rotary precision measurement of hydrostatic gasbearing shafting is simple and feasible, measurement results is accuracy and stability is high, which can meet the measuring requirements for rotaion accuray of hudrostatic gasbearing shafting under space turning movement aerostatic shaft rotary accuracy.

Technology of Positional Detection and Control on Two-dimensional Moving Mechanism Base on DSP

HE Suo-chun；CAI Wen-lin；FU Qiang；LIU Han；DONG Fei；ZHOU Yang

2017, 37(6):  11-15.  doi:10.12060/j.issn.1000-7202.2017.06.03

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The position detection of electric machine is the key technologys of servo control. On the basis of the analysis of the detection of the grating encoder signals, it finds a solution to the receiving and disposal of the signals, and confirms the sampling period, At the same time, the scheme used to control the electric machine of Two-dimensional Moving Mechanism is determined based on PID, through which the control of the electric machine with high response and high precision can be realized.

Application of Digital Industrial Photogrammetry to Realize Antenna Reflector Pose Recovery

ZANG Xin-pan

2017, 37(6):  16-21.  doi:10.12060/j.issn.1000-7202.2017.06.04

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A method to calibrate the antenna without installation at the installation site is introduced. According to the principle of public coordinate conversion, by means of digital industrial photogrammetry (referred to as photogrammetry) technology, which makes the attitude restoration of antenna reflector (including main reflector、subreflector and feed) come true.Through the antenna reflector after pose recovery test Ka/S band diagram and test Ka/S band original pattern indicates the electrical properties of the antenna recovery meet the use requirements.

Attitude Calibration Method of Cubic Mirror Based on Laser Tracker

LIU Liu；HOU Mao-sheng；LIN Xue-zhu；WANG Qiang；LI Li-juan

2017, 37(6):  22-27.  doi:10.12060/j.issn.1000-7202.2017.06.05

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The method of cubic mirror attitude measurement by laser tracker is proposed. Normal measurement of cubic mirror is based on reflection principle and the principle of optical imagery, an angle coordinate system is established, and conversion matrix between two cubic mirrors is calibrated. The experiments of a cubic mirror attitude measurement and calibration of the conversion matrix between two cubic mirrors is presented. The measuring results from experiments show that the method is feasible and the maximum calibration error is better than 5″ and satisfy the precision requirement of the measurement.

Evaluation on Accuracy Influence Factor of Dual Camera Industrial Photogrammetric System

MA Tong-tong；XUAN Ya-bing；WANG Wei-feng；HUANG Gui-ping

2017, 37(6):  28-34.  doi:10.12060/j.issn.1000-7202.2017.06.06

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Introduced the geometric factors which influenced the measurement accuracy of the dual camera industrial photogrammetric system and conducted an experimental test on them, further optimized the precision of the dualcamera industrial photographic system; by using the high accuracy single camera system as the reference, from the respect such as the photography distance, the baseline length and the baseline deviation from the axis position of the test field, the geometric structure of the dual camera measurement system is changed, then analysed and compared with the results of their data. In conclusion, the change of the baseline length and the photography distance has a great influence on position accuracy, and the contrast between the baseline is up to 0.3mm. The change of the angle between the optical axis is less affected, only 0.04mm.

Study of the Digital Speckle Correlation Method in Launch Vehicle Shell Structures

WANG Qun；LI Xiong-kui；LU Zhi-feng；LI Han-hua；ZHOU Jiang-fan

2017, 37(6):  35-37.  doi:10.12060/j.issn.1000-7202.2017.06.07

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Because of the limitation of the measure points′ counts and space by strain electrical measuring method in the static experiments of complex large launch vehicle shell structures, the digital speckle correlation method was presented. The fullfield strain could be obtained effectively, and the method would guide and modify the design of shell structures.


Study on the Record and Playback Test Methods of Navigation Signal Simulator

WANG Tian；YANG Wen-bin；LIU Ying-qian；XIA Tian

2017, 37(6):  38-42.  doi:10.12060/j.issn.1000-7202.2017.06.08

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Navigation terminal testing technology has been getting more and more attention with the rapid development of satellite navigation industry. Traditional laboratory simulation test and actual signal test have advantages and disadvantages. Thus record and playback test has been created. It can effectively complete the actual use test of satellite navigation terminal through acquisition and storage of actual satellite navigation signal and playback under laboratory environment. The record and playback system is described based on the navigation signal simulator. Domestic multimode receiver is selectd as the reference standard receiver. Taking the static scene as an example, the terminal′s accuracy of record and playback is analyzed from the terminal test results perspective. The record and playback test method has been studied based on the navigation signal simulator.

A Camera Operator Detection System Based on PC104

ZHAO Yu-liang；ZHAO Hong-qiang；WANG Shu-juan

2017, 37(6):  43-47. 

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According to the characteristics of the new airborne camera operator, an integrated detection system based on PC104 single board computer is presented, the general design of the detection system is introduced, the interface data simulation design of the ARINC429, ARINC407 and serial differential signals is described. Real-time detection of the bus data interface state is realized by the simulation of bus data sending and receiving, the system state is monitored by serial interface. The experiment proved that the bus data simulated by the detection equipment is accurate, the equipment can be used to collect information and monitor the status of the operator by serial communication, completes inspection of the operator performance according to the maintenance procedure, and meets design requirements.

Test and Analysis on the Response Time of Thermocouple Temperature Sensor

LIU Hao；ZHAO Hua-ye；WANG Wen-ge；HUANG Ze；ZHANG Qi

2017, 37(6):  48-52.  doi:10.12060/j.issn.1000-7202.2017.06.10

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Research on dynamic performance of temperature sensor is relevant to the measurement accuracy of transient process and real time monitoring of control system, which has major engineering value and factual significance in the field of national defense and aerospace. A testing system of dynamic performance of temperature sensor was designed to calibrate the 7 kinds of thermocouple temperature sensors with different structures. By the contrast analysis of the test results on time constant and response time, it will provide a reference in selection and application of thermocouple for temperature dynamic measurement.

Plume-smoke Region Recognition Based On Multi Feature Fusion Analysis

SUN Mei；WEI Zhi-gang；WANG Chang-jian；ZHU Chuan-shuai；LIU Ke-xiang；ZHAO Lu

2017, 37(6):  53-57.  doi:10.12060/j.issn.1000-7202.2017.06.11

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Focus  on accurate measurement of optical signals from the plume in solid rocket motor flight test, digital image processing technology is applied to extract plume static and dynamic characteristics, therefore, the plumesmoke can be identified. In order to filter out the interference of complex environment on smoke measurement, black and white striped background plate with equal spacing was designed. In the black stripe region, adaptive gray threshold is used to extract the smoke feature and the method of RGB and HIS color-space information synthesis is used in white stripe region. The diffusion boundary of smoke region in video sequences is extracted by the method of frame difference. The smoke processing software is compiled based on the algorithm for combining static and dynamic characteristics of smoke. Through a large number of smoke video data validation test, it is proved that plumesmoke recognition can improve the accuracy of optical signal measurement.

Design of Guidance and Control System of Networked Measurement of Exterior Trajectory

WANG Zu-liang；FAN Ling-yan；HUANG Shi-qi；ZHANG Ting；WANG Li-bin

2017, 37(6):  58-62.  doi:10.12060/j.issn.1000-7202.2017.06.12

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Networked measurement technology is researched. A guidance and control system based on networked measurement of exterior trajectory is designed.The guidance and control system optimizes the trajectory from the results measured by radar, electro-optical equipment and telemetry equipment, and broadcasts the trajectory to all test equipments. When the target tracking is lost, the test equipment uses the received data to guide it to capture the target quickly . Trajectory optimization algorithm based on least squares + Letts′ Criterion is proposed. The experimental results show that, compared with the traditional measurement, the tracking rate of the networked measurement is significantly improved, especially the tracking rate of photoelectric device is increased from 75% to about 96%.

Langmuir Probe Diagnosis of High Temperature and High Density Plasma Generated by shock tube

GE Meng；SUN Gang；ZHANG Li-li；XIE Yang

2017, 37(6):  63-66.  doi:10.12060/j.issn.1000-7202.2017.06.13

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The principle of plasma diagnosis by Langmuir probe was described, and the parameters of high temperature plasma produced by shock tube was diagnosed. The plasma density and electron temperature were acquired by calculated according to the volt-ampere characteristic curve. The Langmuir probe results were also compared with ion collector results and they are in agreement of same variation with the mach number ranging from 9Ms～24Ms. The reliability and correctness of using this test system to measure parameters of plasma is conformed. And it also offers an effective way to plasma diagnosis of high temperature and high density.

Application of Limit Control in the Vibration Test

ZHAO Ting；XIANG Jia-jun；MU Xiao-nian；PEI Zhao-bo；LI Chong

2017, 37(6):  67-69.  doi:10.12060/j.issn.1000-7202.2017.06.14

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Introduce vibrancy stress filtration test of one product, insure the product not receive overmuch stress during the test, avoid damaging the sense organ in the product by using limit control and combining virtual reference points(two points), response points(two points). This vibrancy test is different from the general test. Refer to the vibrancy test of the product, state some technical questions about the vibrancy test.

Research on Calibration Method for UPS

WANG Bing；YIN Zhou-hui；ZHANG Peng-cheng；Li Yuan-fang

2017, 37(6):  70-74.  doi:10.12060/j.issn.1000-7202.2017.06.15

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As a kind of device to ensure the stable operation of the power supply, the UPS has been widely used in the field of the national defense force, playing an irreplaceable role in the model test. The working principle and classification of UPS were discussed. And the main calibration items and methods were presented. At present, the methods have become the standard of CALT, directly serving the metrology support in model tasks. Moreover, the methods can also be used to UPS calibration in civilian areas, with a high value to promote the application.

Development of DC Electric Machine Speed Control System Based on PI Control

HUANG Jian

2017, 37(6):  75-78.  doi:10.12060/j.issn.1000-7202.2017.06.16

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In order to solve the problem of speed control of DC electric machine, an incremental PI control method is used to control the speed of Brushless DC motor. The analog regulator is discretized, and the encoder is used to measure the speed of the motor every 10ms，software filtering is used to verify the value. The discrete difference equation is used to replace the continuous differential equation, and the PI control algorithm is realized by software. The experimental platform based on STM32 is built, the P and I parameter tuning method is given, and the appropriate P and I coefficients are obtained through a large number of experiments, which verifies the correctness of the incremental PI control method. The results show that the PI control algorithm can achieve a constant speed control, fast response, strong antiinterference ability.Provided the methods and procedures for PID control.

A Design of Ignition Control System Based on Beckhoff Controller

MENG Xiang-yu；CAI Hui-hua；XU Chao；WU Yong-hong；JIANG Zhu

2017, 37(6):  79-83.  doi:10.12060/j.issn.1000-7202.2017.06.17

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A kind of ignition control system based on Beckhoff controller is designed. The main function of ignition control system is introduced. According to the function requirement, the total design scheme and the main system composing are confirmed. The ignition circuit and basic principle are analyzed and introduced. Every part of the system is introduced particularly. Trigger signal is provided to control system front end, measure system front end and camera system by ignition control system. Ignition signal is provided to ignition device by ignition control system.

Research of Influnce Factors on Oxygen Content of Gas

SHAN Jing；WU Peng；LIU Lin；YIN Jie；WANG Jie

2017, 37(6):  84-87.  doi:10.12060/j.issn.1000-7202.2017.06.18

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The operational principle of 5200 oxygen analysis meter was presented. it was proposed that some differences existed in the oxygen content measured for the same gas sample under different measuring conditions. It was proved through analysis and research that the main influence factor was environment temperature. A set of constant temperature pipeline installation was designed to obtain the accurate control for outlet temperature of gas sample, thus reaching the result of effectively eliminating the measuring error between different environment temperature.