Table of Content

15 April 2016, Volume 36 Issue 2

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Study of Measurement Method for Separation Device Based on the Laser Doppler Vibrometer

ZHANG Hong-jian；ZHUANG Fang-fang；JI Bao-feng；QU Zhan-long；GUO Yue

2016, 36(2):  1-3.  doi:10.12060/j.issn.1000-7202.2016.02.01

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To reduce the error and operating diffieculty in the current high speed camera measurement method, a new measurement method based on the laser Doppler vibrometer is founded to measure separation device accurately. The new method can improve the measurement accuracy and provide the basis for precision design in separation device.

Design of A New Type of Low Temperature Tolerance Displacement Sensor

JIANG Xiao-tong；XIONG Wei；REN Hai-yan

2016, 36(2):  4-7.  doi:10.12060/j.issn.1000-7202.2016.02.02

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A new type of low temperature tolerance displacement sensor is introduced, linear variable differential transformer principle is used in the displacement sensor. By using series of optimization design and low temperature resistant material selection to meet the system requirements of low-temperature environment, while one end is fixed and the other is hinged, a distal end flange mounting of wearing ring is supported,which overcomed the impact of the sensor caused by cantilever structure under vibration, shock mechanical environment ,the product stability in vibration conditions of work is improved , the problem of system installation compact is solved.

Design of Optical System for Infrared Dynamic Target Simulator

GAO Qiu-juan；SHA Chun-zhe；GUO Yu-rong；WANG Qiang；LIN Sen；JIANG Yun-xiang；LIU Kai

2016, 36(2):  8-11.  doi:10.12060/j.issn.1000-7202.2016.02.03

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A type of dynamic infrared target simulator is designed for performance testing of infrared seeker. In the simulator, a Digital Micromirror Device (DMD) is used to perform reflection modulation blackbody infrared radiation, and an optical collimation system is used to achieve optical coupling of infrared scene generation system and infrared seeker. Optical collimation system has been designed and optimized by using ZEMAX software, and good imaging quality was achieved by optical collimation system, which is close to diffraction limit, i.e., the diameter of spot diagram is smaller than that of the Airy and the distortion is less than 0.1%. Experimental results show that the system has very good environmental adaptability, can be used for calibration of infrared seeker very well.

Discussions on the Classification of Angle Quantity

SUN Fang-jin；SHANG Qiu-fang

2016, 36(2):  12-15.  doi:10.12060/j.issn.1000-7202.2016.02.04

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The frequently used angle was the plane angle in the International System of Units, so the starting point of classification should be the plane performance of the plane angle. Because of the plane was divided into geometric plane and physical plane, so the plane angle could be divided into two parts: geometric angle and physical angle. The geometric angle was divided into arbitrary angle (circle indexing angle), fixed angle and small angle; the physical angle was divided into projection angle on horizontal plane, projection angle on vertical plane and projection angle on specific plane. The new classification method was proposed just as suggestion for discussions.

Calibration Method and Uncertainty Analyses of Pulse Laser Ranging Error

LIU Hong-bo；FEI Feng；SHI Xue-shun；LIU Yu-long；LIU Chang-ming；CHEN Hai-dong

2016, 36(2):  16-21.  doi:10.12060/j.issn.1000-7202.2016.02.05

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Taking the pulse laser rangefinder for ranging error as application background, in this paper, the analytic form of the ranging error was given, and the impact of uncertainty to ranging error were presented according to the formula. Meanwhile, the uncertainty of the signal delay, response of detector and laser diode, crystal oscillator frequency, refractive index of air is calculated. A laser rangefinder was selected as the experimental object and the distance was tested at 500m~20000m. The experimental showed that the max relative standard uncertainty was 0.67m belong to test repeatability. It can meet the uncertainty 5m(k=2) ranging calibration. The performance of ranging error device can be effectively assessed with this formula, and it is of important guiding significance for the laser rangefinder and laser ranging error design.

Research on Measurement Method of Mechanical Environment of Satellite-rocket Separation

WANG Ying；ZHANG Yuan；LU Juan

2016, 36(2):  22-26.  doi:10.12060/j.issn.1000-7202.2016.02.06

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The measuring method on launch vehicle flight′s mechanical environment with real-time, high-precision and low occupancy rate of resources is researched, especially under the complex mechanical environment of satellite-rocket separation, a novel presetting control method is proposed to realize the reuse of measurement resource on shock and noise. The traditional ground processing mode on shock and noise measuring is fully compared with our method and the difference is fully analyzed. The results show this novel method has good performance and provides valuable reference to the engineering application.

Research of A New  Calibration Method for Drivmatic Riveter

AI Zhao-chun；XUE Wen-rui；ZHAO Hui；WANG Chao；HAN Ruo-xi

2016, 36(2):  27-30.  doi:10.12060/j.issn.1000-7202.2016.02.07

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According to Boeing D6-56617 technical specifications and calibration needs of drivmatic riveter proposed by aircraft manufacturing enterprises, a new calibration method has been researched.Increasing the verticality calibration of the shaft axis and the turntable ,there is also the calibration of coaxiality for the lower die,to ensure the accuracy of all parameters.

Pointing Error Analysis of InterSatellite Rapid Variant Narrow Beam Antenna

XIE Ling；HUANG Wen-de；SHENG Li-yuan

2016, 36(2):  31-36.  doi:10.12060/j.issn.1000-7202.2016.02.08

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For the characteristics of rapid variant narrow beam antenna that connection time is short and accuracy requirement is very high, through the establishment of inter-satellite link antenna pointing error model, it is analyzed that the influence of deviation factors such as position of satellite, attitude and antenna installations to antenna pointing error. Meanwhile, STK software is used to simulate the pointing error of the MEO satellite .The experimental result is consistent with the theoretical expectations of the error model.

Error Calibration and Compensation of Threeaxis Accelerometer Based on Nonlinear Transform

LIU Yan-xia；FANG Jian-jun；SONG Yu-qiu；SUN Jian

2016, 36(2):  37-41.  doi:10.12060/j.issn.1000-7202.2016.02.09

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In order to improve the three-axis accelerometer′s measurement accuracy, an error model is established based on its error source and producing mechanism. Nonlinear observation equation is deduced by the error model and constant amplitude of gravity field. Through introduced two unknown parameter vectors, nonlinear observation equation is mathematically converted into a linear form relative to new unknown parameter. Then batch leastsquare method is used to estimate the new unknown parameters. Biases, scale factors and non orthogonal error are solved by inverse analytic arithmetic. The experimental results show that the maximum error of accelerometer can be reduced about 100 times and the accelerometer accuracy can reach 10^-3m/s². Experiments have good repeatability. The method is a high efficiency batch least-square method and the compensation effect is remarkable.

Primary Study on the Feasibility of  Technology to the on-ship Voltage Meters (or Current meters) being Calibrated on Site

ZHANG Xin-qin；ZHANG Yue；SONG Jian-bo

2016, 36(2):  42-44.  doi:10.12060/j.issn.1000-7202.2016.02.10

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The necessity of calibrating those on-ship voltage meters (or current meters) on site is analyzed, and the influence of environmental temperature and humidity variation on the Multi Function Calibration Source which model is XF30A-2 is studied, and the feasibility of using the standard set to carry out the calibration of the on-ship voltage meters (or current meters) on site is discussed.

Design and Implementation of A Novel Temperature Measurement Signal Isolation Transmitter with Strong Interference Signal Rejection Ability

JIANG Zhu；YU Da；ZHANG Meng

2016, 36(2):  45-48.  doi:10.12060/j.issn.1000-7202.2016.02.11

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To deal with the interference signal produced by the tools of the communication in the workplace of the transmitter, a novel temperature measurement signal isolation transmitter has been designed and developed. This novel transmitter can reject the interference signal effectively with the differential amplifier and isolation amplifier. The test results show that the transmitter has high measurement precision, strong interference rejection capability and great engineering values.

A Redundancy Design of Flush Air Data Sensing System

OU Lian-jun；ZENG Gui-ming；LIANG Jun

2016, 36(2):  49-52.  doi:10.12060/j.issn.1000-7202.2016.02.12

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To the flush air data sensing system, the redandancy of system and parameters solution method are studied. First, pressure measurement hole layout method is presented briefly, system redundancy is designed with double redundancy based on computer-in-database for reliability. Then parameters solution model and method are constituted and educed. When these model parameters were got, air data will be computed with optimal linear leastsquare unbiased estimation.

Design and Application of Measurement and Control Software for Cable-Extension Displacement Sensor Testing Instrument

LIU Hua；XU Wei-yi；HUO Xiao-fei；JIANG Xin

2016, 36(2):  53-56.  doi:10.12060/j.issn.1000-7202.2016.02.13

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In order to meet the demands of measuring cable-extension displacement testing instrument, the measurement and control software is developed .The software can control the high speed linear induction motor to drive the testing instrument, record the test data and realize the measurement. With the management of testing as the core task in the software, control servo system and storing data are finished by high level priority thread and timer. The experimental results demonstrate that the software design can meet the expected requirements. This software had been used in practice.

Design of Air Data Computer Based On COTS

JIANG Zhi-hua；TIAN Xin-feng

2016, 36(2):  57-60.  doi:10.12060/j.issn.1000-7202.2016.02.14

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Air data computer is an important part of UAV airborne equipment. In order to enhance the efficiency and reduce costs, a method is given for design of an atmosphere data computer based on COTS(Commercial-off-the-shelf). The type-selected scheme of its hardware platform is presented. The function of system is on the basis of commercial uc/os operating system. This works were verified by experiment. Experiments have been testified that the designed system scheme is reasonable and efficient and it meets the design and appliance requirements of UAV.

Research for Low-frequency Underwater Sound Metrology Based on the Calibration System of Vector Hydrophone

LU Zhi-qiang；LIAO Shu-chang；YU Hong-tao

2016, 36(2):  61-63.  doi:10.12060/j.issn.1000-7202.2016.02.15

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It is expounded the calibration system of vector hydrophones apply to low-frequency underwater sound metrology, and introduced the metrology theory for two class hydrophones of the low-frequency underwater sound. It is proved that the feasibility of calibration system of vector hydrophone apply to the traditional hydrophones throught the suitable object, performance and measurement data of the two system. This is very importance and significance to make full use of the equipment resource.

Flying Speed of Hypersonic Aircraft in the Mesosphere

ZHAO Hui

2016, 36(2):  64-68.  doi:10.12060/j.issn.1000-7202.2016.02.16

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Based on the FLUENT software package, the Sp-A turbulence model and AUSM computational format are used to calculate the maximum Match Number of the highest allowed temperature of the ceramic aluminum oxide at various of heights including 30 km, 45 km, 53 km, 60 km and 75 km by modeling the external filed of the atmosphere at ultrasonic speed. Results show that below 53 km, the maximum Match Number decreases with the height, and then increases. The changes have the same trend with the changes of the ambient temperature. The static temperature has the most significant influences to the stationary point.

A Study on the Method of Improving the Accuracy of Thermal Resistance Temperature Measurement

WANG Shu-jie

2016, 36(2):  69-71.  doi:10.12060/j.issn.1000-7202.2016.02.17

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The resistance-temperature characteristics of industrial platinum, copper thermal resistance and copper resistance are analysed, as an example, the method to improve the accuracy of industrial platinum thermal resistance temperature measurement is listed. Through the several points test of temperature sensor, the measured data curve is fitted by using the least square method, the new resistance-temperature conversion formula and indexing table are received. Comparison of the experimental data shows that this method can improve the accuracy of temperature measurement.

Estimation of UAV Servo Potentiometer Wear Reliability Based on Mechanical Interference Theory

CONG Shu-quan；CHEN Jian-tao

2016, 36(2):  72-75.  doi:10.12060/j.issn.1000-7202.2016.02.18

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Based on the strength and stress interference theory of mechanical product，the position feedback potentiometer wear reliability coefficient of an important component of actuator for UAV flight control system is analyzed and calculated.Also the reliable working life of the steering gear with different reliability is estimated.All above is provided for design of UAV flight control system and use of repair.

Strengthen A Laboratory Capacity Maching Improve Calculate A Guarantee Ability to the Exaltation Military

ZHU Jun；PAN Hai-fei

2016, 36(2):  76-78.  doi:10.12060/j.issn.1000-7202.2016.02.19

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To counter the status quo of military metrology, the importance of developing the Capacity between laboratories is analyzed, and combined with years′ army inter laboratory proficiency, several problems that should pag attention to do the ability ration well are presented. Through the research of quantity value transferring methods applied to the military characteristics, characteristics of methods of value transferring, the calibration standards and devices for comprehensive and flexible, rapid equipment are established. The purpose is to improve the ability of military security measure.