Table of Content

15 December 2016, Volume 36 Issue 6

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The Measuring Technique for Spatial Virtual Axis

ZHANG Zhi-yong；LIU Li-hui；ZHAO Tian-cheng；GAO Li-qin；ZHOU Jun；WANG Zhan-tao

2016, 36(6):  1-4.  doi:10.12060/j.issn.1000-7202.2016.36.6.1

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Because the spatial virtual axis does not exist as a direct substantiality, the traditional technique of contact measurement can not be adopted for it. Therefore, the research on the measurement instance of virtual boresight of satelliteborne camera was carried out by using normal instrument to derive it according to its optical characteristics. Every object for transfering attitude relations was modeled based on measurable data. According to the internal relevance between every object, the precise formula of spatial virtual axis is deduced. Because of the considerate design for the existing conditions, the technique can be applied to the engineering practices.


Thermal Design and Analysis for Missile borne Infrared Thermograph

CHANG Hong；LIU Yong；WEI Xiao-lin；LIN Sen

2016, 36(6):  5-8.  doi:10.12060/j.issn.1000-7202.2016.36.6.5

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Be restricted within the narrow space, missileborne infrared thermograph integrates the electrical，optical and mechanical components in limited space． The imaging quality of thermograph and detector capability will be affected by the heat dissipation of internal components and the external heat flux conducted by mechanical parts． Thermal design is needed to guarantee its normal work and high imaging quality in outer space． In this paper thermal design was taken according to the thermal environment and the structure characteristic of the thermograph. Passive control methods were used to extend the thermal time constant. The heat transfer model was built, and the simulation was taken based on the thermal control methods and the work condition. The analysis results showed that the temperature of thermograph was between 10℃~60℃, which met the thermal control index. Through the analysis, a warrant for reliability of thermograph and optimization of thermal design was provided.


Research on Video Observation System of Anti-ship Missile and Target Encounter Based on Seaborne Buoy

DING Li-jun； XU Yi-qun；CONG Shu-quan

2016, 36(6):  9-12.  doi:10.12060/j.issn.1000-7202.2016.36.6.9

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According to the problems in area of video observation of antiship missile and target encounter, a kind of video observation system of missile and target encounter is put forward. The general scheme was designed, and the operating mode was depicted. The observation capability of the system was analyzed, and the key technologies were studyed.
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The Compensation Method for the Effect of the Reference Point′s Jitter in Non-contact Displacement Measurement

 

LU Song；LI Tao；LIN Zhi-jun；CAI Ping；JI Xiao-jun

2016, 36(6):  13-19.  doi:10.12060/j.issn.1000-7202.2016.36.6.13

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During threedimensional vibration displacement measurement based on optical devices, the reference point of the optical measurement system must remain stationary. It is difficult to satisfy this condition in field tests. To solve this problem, a compensation method was presented to amend the influence of small vibrations of the reference point. The displacement of the reference point can be obtained from its acceleration signal at first, and the correction matrixes for target displacement are derived for compensating the measurement errors caused by the shaking of the reference point. The data processing algorithm to convert acceleration signal to displacement signal is presented, and the effectiveness of this algorithm is verified by simulation of composite sinusoidal signals and damped decaying vibration signals with random white noise. The theory and calculation procedure for correction matrixes derived from displacement of the reference point are comprehensively discussed. The experimental measurement system was built using two sets of NDI Optotrak Certus System and one 3D capacitive accelerometer, which is used to verify the theory and method proposed in the paper. Measurement results with data processing show that this method can effectively compensate and correct the measurement errors due to vibrations of the reference point, thus improved measurement accuracy is expected.


 

Research on the Application of Virtual Digital Process Equipment Measuring Platform Based on Large Scale Manufacture

WANG Zhi-hua；ZHOU Xiao-qing；LIU Ying

2016, 36(6):  20-24.  doi:10.12060/j.issn.1000-7202.2016.36.6.20

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Difficulties of a largescale special parts in the manufacturing process were analyzed. The design principle of virtual digital Process Equipment measuring platform was discussed, which based on the laser tracking digital measuring and positioning technology. Combined with an example, the application of measuring platform in the manufacturing process of largescale special parts was explained in detail, and the coordinate array control method was adopted to solve the difficulties in manufacturing process. By the verification in practice, the measuring platform can effectively assist the manufacture of largescale special parts and effectively control the quality

Research on Auto Home Control Method of  Incremented MultiReference Mark Encoder

MAI Ji；HU Rui；CHEN Shan-zhi；WANG Yu-feng；ZHANG Xin-lei

2016, 36(6):  25-28.  doi:10.12060/j.issn.1000-7202.2016.36.6.25

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The multi-reference mark encoder is used widely in metrology measurement and autocontrol as angle measuring device.The principle and coding mode of multi-reference mark encoder were introduced with an encoder of HEIDENHAIN company as on example. A research on a new auto home control method was taken based on the characteristics of multi-reference marks encoder. This method was used to collect and analyze the test data for a certain rotary table.The control method was proved reliably and accurately in test.


Subdivision Design of Grating Moire Fringes and Simulation by Simulink

YANG Hua-hui；FENG Wei-li；LIU Fu

2016, 36(6):  29-34.  doi:10.12060/j.issn.1000-7202.2016.36.6.29

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According to the high precision subdivision requirements of metrological grating Moiré fringes, a subdivision method of grating based on ADC amplitude sampling and phase resolution was established. And the simulation model of this subdivision method was established to convert the sin & cosine signals into two quadrature encoding signals after positive cotangent transforming, the amplitude sampling phase dividing in fixed step size and other processing method. The results of simulation experiments show that the interpolation of this method is related to accuracy of ADC with the ideal signal inputting and the maximal interpolation can be increased up to 1000 by improving the ADC sampling digit. The simulation experiment also verified that subdivision precision mainly depends on the signal quality by adding noise interference including unequal amplitude error, quadrature phase shift error and high order harmonic components to the dynamic sin & cosine ideal signals.

A Design of the High-precision LVDT Sensor with Large Measuring Range Ratio

LIU Shu-xuan； LI Wen-zhang；REN Hai-yan；YU Fei

2016, 36(6):  35-39.  doi:10.12060/j.issn.1000-7202.2016.36.6.35

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In order to meet the largerange requirements of the feedback measuring units in a feedback system within a limited mounting space, a highprecision linear variable differential transformer(LVDT)sensor with large measuring range ratio was designed. The principle and structure of the LVDT sensor were illustrated and the coil winding method of the existing LVDT sensor which was systematically analyzed. And then, a new method of coil winding was proposed. Compared with the conventional LVDT sensor, this method had a greater measuring range without increasing the geometric size, which enables the effective measuring length to be 70% of the measuring rod. Finally, the test proved that this new product satisfized the measurement of large measuring range ratio with the linearity as high as 0.6%.
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A Relative Spectral Responsibility Auto-Testing System of Infrared Focal Plane Array

JIANG Bin； YING Cheng-ping； LIU Hong-yuan； WANG Hong-chao

2016, 36(6):  40-44.  doi:10.12060/j.issn.1000-7202.2016.36.6.40

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It is necessary to measure the spectral responsibility of every single wavelength manually when measuring the relative spectral responsibility of infrared focal plane array. But the process is very complex and timeconsuming. Based on the different platforms, a relative spectral responsibility autotesting system of infrared focal place array was researched by dynamic linking library technology. It will reduce the complicated operation and meet the needs of various device measurement.

Research on the In-Situ Thrust Calibration Techniques of  Aero-engine Test Bed Based on a Novel Hydraulic Force Source

ZHU Xi-ge; WANG Xiao-san

2016, 36(6):  45-49.  doi:10.12060/j.issn.1000-7202.2016.36.6.45

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A novel hydraulic force source is introduced in this paper with the main features of high accuracy, refined dividing of differential flow, adaptation to the motor′s speed characteristics and constant leakage. The application of this hydraulic force source on in-situ calibration of the aero-engine test bed was carried out, and the result was compared with that from the calibration in the laboratory. Finally, some applicable conclusions were summarized on the thrust calibration of the aero engine test bed.
 

Development of Thrust Measurement Device on Hydrogen Oxygen Rocket Engines in the High Altitude Simulation test for Orbit and Attitude Engine

ZHU Zi-huan；CAI Rui

2016, 36(6):  50-55.  doi:10.12060/j.issn.1000-7202.2016.36.6.50

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To ensure accurate thrust measurement of hydrogen oxygen rocket engines under high altitude environment，according to the characteristics of high altitude simulation test on hydrogen oxygen rocket engine, the theory of thrust measurement and the actual layout requirements，the thrust measurement device design of cryogenic and vacuum environment was researched. The spring design technology of small elastic resistance was developed. A control technology to keep the calibration force and the thrust axis consistency was realized. The implementation technology on moving to static of the calibration mechanism for the seal about the vacuum cabin，and the control technology of pipeline constraint for thrust measurement influence were solved. A set of thrust measurement device was successful developed，and the application of a model of rocket engine test has achieved good results.

Research on Layout of Pressure Taps in Flush Airdata Sensing System

JIANG Yang；ZHANG Lei；LI Ming

2016, 36(6):  56-60.  doi:10.12060/j.issn.1000-7202.2016.36.6.56

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Flush airdata sensing system is an advanced airdata sensing system，in which airdata are inferred from nonintrusive surface pressure measurements using a nonlinear pressure model and a nonlinear solution algorithm．The layout of pressure taps in flush airdata sensing system was researched by analyzing the convergence of data calculation under different layouts with ripples algorithm and demonstrated with calculation precision under different layouts with white noise influence.


The Research of the on-site Calibration Method to High Pressure Gas

WANG Ping；XIAN Bao-jin；DU Guang-yu；HUANG qi-gang；JIAO Xiin-xin

2016, 36(6):  61-65.  doi:10.12060/j.issn.1000-7202.2016.36.6.61

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According to the requirements of the high pressure gas equipment′s on-site Calibration, the method of the high pressure gas on-site Calibration is introduced. The investigation of the high pressure gas on-site Calibration technology is introduced, including the technology demand of the standard  equipments, environment, items of calibration, and the choice of calibration points. Using the method, the pressure equipments can be calibrated in its measurement rang without disassembly. It will be convenient to the pressure equipment′s calibration. At last, the uncertainty of the on-site high pressure gas equipments′s calibration was analyzed. 


The Research of PD Controll Method Based on the Tracking Differentiator for Course of a Target Ship

LI Shuang-ming；PAN Yu-chun

2016, 36(6):  66-69.  doi:10.12060/j.issn.1000-7202.2016.36.6.66

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In order to solve the overshoot of the target ship′s course under the PD controller and noise disturbance to sensors used in the sea, a PD controller for the target ship′s course based on the tracking differentiator was proposed. The kinematics model of the target ship was established. The disturbance torque model of wind and Ocean current were buitt. The principle of tracking differentiator was elaborated, and the PD controller based on tracking differentiator was designed. Adding Gauss white noise to the measurement of course signal, simulations were carried out for PD controller and TD controller respectively.


Restraining o f Instantaneous Velocity Fluctuation on the Turntable

WANG Yu-feng, ZHANG Xin-lei, FAN Xiao-dong, ZHANG Gong

2016, 36(6):  70-73.  doi:10.12060/j.issn.1000-7202.2016.36.6.70

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The porrameter of rate is very important to evaluate the rate turntable and other inertial navigation test devices with rate function. In view of the inertial testing equipment, the rate test method can't reflect the instantaneous angular rate in the operation of turntable.Based on the analysis of the turn­ table rate fluctuation, butterworth low-pass filter was used in the turntable rate ring. The effectiveness of the filter was demonstrated through MATLAB simulation analysis and table velocity curve drawing.

Design of Intellectualized Power Distribution System Based on VPX Bus

JIANG Shuang;ZHANG Xiang;PAN Jiang-jiang;ZHAO Yan

2016, 36(6):  74-76.  doi:10.12060/j.issn.1000-7202.2016.36.6.74

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Technical standard and technique characteristics of VPX bus were introduced. The composition and function of power supply and distribution system using VPX bus were presented. And then, based on VPX bus architecture, the power supply, control and instruction of VPX board was analyzed, and the technical proposal was finished. Some experiments which optimized board configure were carried out, and the result proved that the power supply and distribution system using VPX bus architecture has a superior stability. Then the system had applied foreground.


A Design of Automatic Explosive Tester

2016, 36(6):  77-81.  doi:10.12060/j.issn.1000-7202.2016.36.6.77

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A kind of automatic explosive tester used in aerosystem was designed. The main function, technical index, test principle and system composing of the tester was introduced. The resistance test and insulation test of the explosive device were carried out by the tester. The realtime test data was compared with the corresponding data in the eligible certificate, and the data was judged whether it is eligible or not. The last register was stored in the USB flash disc. The testtime registering function and failure informing function were provided in the tester. Through debugging and testing, the tester runs reliably and stably in a long time, and the user′s requirement was completely satisfied.


Research on Development Status of Pulse Current Shunts

CUI Shao-ying；WANG Shu-qiang；MA Zhi-yi

2016, 36(6):  82-88.  doi:10.12060/j.issn.1000-7202.2016.36.6.82

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Accurate and reliable measurement of pulse current has great scientific value and wide applications. In the pulse current measurement system, pulse current shunts are the common devices for signal conversion. Based on the principle of shunts, the status of the pulse current shunts was investigated. The structures of the pulse shunts were focused. The pulse shunts were classified, and furthermore, the measurement range, accuracy and other characteristics of shunts with different structure and material were summarized. The research provides reference to the development direction and the promotion of measurement accuracy of the pulse current shunts.


Research on Positioning Control Technology of Stepping Motor Based on AVR MCU

YANG Ying-hui

2016, 36(6):  89-95.  doi:10.12060/j.issn.1000-7202.2016.36.6.89

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A stepper motor control system based on AVR microcontrollers was introduced, which can realize the control of acceleration, deceleration and deceleration of the stepper motor. It can also realize the control of the running time when the precise positioning operation was realized. The position measurement error was measured and the traditional openloop position control method was changed to improve the position control precision.