Table of Content

15 August 2016, Volume 36 Issue 4

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A Method for Perpendicularity Measurement and It′s International Comparison

LIU Yong；YIN Kun；JIANG Xin；YUN Peng；ZHOU Cai-hong

2016, 36(4):  1-5.  doi:10.12060/j.issn.1000-7202.2016.04.01

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The progress is introduced that Beijing aerospace institute for metrology and measurement technology participated in the international comparison on perpendicularity measurement, which was held by Asia Pacific Laboratory Accreditation Cooperation (APLAC). The perpendicularity of inner and outer angle on the square was measured with the dial indicator of perpendicularity standard device. The error separation technology was used in the measurement by turning the square sample to 180° in order to eliminates the influence of the perpendicularity error. The measuring uncertainty was also analysed. The result of comparison shows that the E_n score of all the measuring points are less than 1 perfectly.

Study of the Equivalent Test Method for the Grid Fin Deployment

WANG Chen；WANG Xiao-jun；TONG Wen-min；LI Han-hua；ZHANG Hong-jian；ZHANG Zhi-guo

2016, 36(4):  6-10.  doi:10.12060/j.issn.1000-7202.2016.04.02

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Before the vehicle flight test，the grid fin deployment and mechanical properties should be examined. The current ground simulation test method was not able to simulate the deployment process and the impact action to the shell and grid fins effectively. A new feasible ground equivalent test method based on elastic rope was founded to simulate the process of grid fin′s deployment. The method could provide valuable reference to other similar tests.

Damping Design for the Infrared Imaging Device on Aircrafts

WEI Xiao-lin；CHANG Hong；LIN Sen

2016, 36(4):  11-14.  doi:10.12060/j.issn.1000-7202.2016.04.03

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The infrared imaging device on an aircraft is subjected to severe shock, impact and other dynamic loads during its working process. In order to avoid the irreversible damage of precision components caused by the big dynamic response,the device should install the damping system. An optimized vibration absorbing structure of the imaging optical system based on Finite Element Method was introduced. Experiment results show that the damping efficiency of the infrared imaging device with the damping design is over 70%.The working environment of the device is improved effectively.

An Algorithm of Track Refined Correlation within Formation Targets Based on Systematic Error Automatic Compensation

WANG Hai-peng；JIA Shu-yi；PAN Xin-long；TANG Tian-tian

2016, 36(4):  15-22.  doi:10.12060/j.issn.1000-7202.2016.04.04

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Aiming to solve the track refined correlation problem of the formation targets with systematic errors, an algorithm of track refined correlation for formation targets based on systematic error automatic compensation and the characteristics of the formation tracks was proposed with the error estimation technique and the track correlation technique. In this algorithm, the formations are identified by the tracks of the sensors based on the circulatory threshold model firstly. Secondly, the preparatory correlation formations with the nearest resolving state are searched or established based on the formation track state identification model. Thirdly, the final systematic errors are estimated with formation track systematic error estimation model and error validation model. Furthermore, the error compensation is completed. Finally, formation track refined correlation is done by use of the traditional track correlation algorithms. The analysis results of the simulation data show that the general performance of this algorithm can meet the engineering requirement of the track refined correlation for the formation targets very well. It is much better than that of fuzzy track alignment-correlation algorithm based on target topological information, track alignment-correlation algorithm based on iterative closest track and modified weighted track correlation algorithm.

Sensitivity Enhancement by Combined Magnetization in the Pulsed Eddy Current Testing for Ferromagnetic Materials

LEI Hua-ming；JI Xiao-jun；MAO Yi-mei

2016, 36(4):  23-26.  doi:10.12060/j.issn.1000-7202.2016.04.05

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Pulsed eddy current (PEC) testing is a new type of nondestructive testing techniques emerging in recent years. For ferromagnetic materials pulsed eddy current testing, a combined magnetization method was presented.A DC magnetic field is added to the specimen to change the magnetic permeability of the material inspected, to achieve higher detection sensitivity when loading pulsed excitation. Theoretical analysis and experimental results show the effect of the combined magnetization on detection sensitivity.

Research on Joint Measurement Method of iGPS System and Theodolite System

YANG Zhen；YI Wang-ming；FAN Bai-xing；YANG Zai-hua；RUAN Guo-wei

2016, 36(4):  27-31.  doi:10.12060/j.issn.1000-7202.2016.04.06

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iGPS measurement system has a wide range of applications in the field of aerospace manufacturing, the installation and the test of the largesized industrial equipment because of its convenience and efficiency when establishing a coordinate and surveying points. But in many tasks of collimating cubic prism in spacecraft measurement, the only facility we can use is theodolite system. However, the theodolite system is inefficient when surveying a lot of points. The coordinates of these points need to be transfered from iGPS system to theodolite system in order to achieve joint measurement. Based on the above situation, two methods of coordinate transformation were studied. A calibration board method was proposed, and its principle and transformation process were analyzed. Finally, an experiment was carried out to prove its reliability and accuracy.

Movement Parameters Design of an Underwater  Vehicle Testing System

ZHAO Gong-wei；WANG Zhen；SHANG Qiu-fang；ZHOU Yu-tang；LI Yong-gang

2016, 36(4):  32-37.  doi:10.12060/j.issn.1000-7202.2016.04.07

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The movement parameters of the underwater vehicle testing system based on Motion tracker instrument （MTi）were designed for the requirement of underwater experiment. The principle and arithmetic of the system, the hardware design and the software design were introduced . In the system , the MTi based on MEMS sensor technology was used as IMU. Navigation computer acquires the sensor data from accelerometers, gyroscopes and magnetometers of MTi, and then calculates and stores the attitude, speed and position of the underwater vehicle by updating rotation matrix with the SINS quaternion arithmetic. In the end, the data was read and stored by the navigation computer. The movement parameters of underwater vehicle have been acquired in underwater vehicle experiment by the testing system for many times. The testing system is reliable and meet the need of the movement parameter testing of underwater vehicle.

A Core Control System Design of Energy Dispersive X-ray Fluorescence Spectrometer

YANG Jie；LE Jun；GUO xiao-bo

2016, 36(4):  38-43.  doi:10.12060/j.issn.1000-7202.2016.04.08

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Aiming at the special requirements of the energy dispersive X fluorescence spectrometer for communication, control and measurement, the core control system of the energy dispersive X fluorescence spectrometer based on STM32F103RBT6 processor ARM was designed. The hardware platform combined with the upper computer in the core control system.The hardware platform is integrated with the USB-HUB function, and the circuit design is simplified by using the special stepping motor driver chip, which saves the development cycle.It is improved the ability to resist surge from lightning strokes by increasing the transient diode protection circuit. A safe interlock function is contained in the system. Experiments show that the system is safe and reliable, and has good application prospect.

Design of the Multi-point Trailer Falling Weight Deflectometer

YIN Zhao-hui；WANG Bing；LIANG Wei-wei；LIU Xiao-xu；GAO Yi-chun

2016, 36(4):  44-50.  doi:10.12060/j.issn.1000-7202.2016.04.09

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A type of multi-point trailer falling weight deflectometer(FWD) was introduced. The system structure, operational principles and key technologies was described. The performance test results show that the load and deflection measurement repeatability is less than 2%. It has stable and reliable performance to meet the technical requirements. The deflection test data of FWD and Beckman Beam have good linear dependence relation under the same test conditions, and the formula for deflection test data conversion can be found. A foundation for spread application of FWD pavement test technique was provided in highway engineering.

Research on the Multipoint Real-time Measurement of Large Truss

YI Li；TAO Wei；GAO Wen-jun；ZHAO Hui

2016, 36(4):  51-54.  doi:10.12060/j.issn.1000-7202.2016.04.10

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Large deployable truss is widely applied in various fields. It is important to measure the large deployable truss. The current measurement methods were compared and their disadvantages were pointed out. A new large deployable distortion measurement method   based on laser collimation was proposed. The new method carries out multipoint real-time measurement based on collimated laser beam split. By analyzing its principal, an experiment system is designed. The results show the measurement system can measure twodimensional deformation of large deployable truss with good stability.The repeatability error is within 1.1% and the nonlinear error is within 0.6%. The new method can carry out multipoint real-time measurement without guide rail or moving device. With good environmental applicability, high measurement precision and good expansibility, the new measurement method has great prospect.

Random Response Analysis of a Three-axis Turntable Based on ABAQUS

HU Yong-xiang；LIU Jun-song；ZHAN Hong-wei；TIAN Ming-rong；KOU Shu-hui；YUAN Zi-wen

2016, 36(4):  55-59.  doi:10.12060/j.issn.1000-7202.2016.04.11

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By using finite element analysis software ABAQUS, a model analysis of a three-axis turntable was carried out, and the model′s inherent frequency and vibration type was obtained. By improving the structure of the threeaxis turntable, model′s inherent frequency is increased. In the end, by carrying out random response analysis of the model, the acceleration curves of a node in the model are output. These data and curves can support vibration experiment of threeaxis turntable.

Conceptual Design and Reserch of Supersonic Target Drone

LIU Jing；LIU Zhi-qiang

2016, 36(4):  60-63.  doi:10.12060/j.issn.1000-7202.2016.04.12

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According to the requirements of test and evaluation of weapon system, the general technology requirements were put forward. The conceptual design of supersonic target drone on the aircraft design procedure was finished. The dynamic system, aerodynamic configuration and aerodynamic characteristics were designed in detail. The main flight performance was calculated. The foundation of engineering implementation for the supersonic target drone has laid by the conceptual design. 

Application of the Sneak Circuit Analysis in Aircraft Design

ZHANG Xiang；ZHAO Yan；YANG You-chao；JIANG Shuang；LI Hai-wei

2016, 36(4):  64-67.  doi:10.12060/j.issn.1000-7202.2016.04.13

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The concept and development of the sneak circuit analysis are introduced. The relations of sneak circuit analysis and others reliability methods are analyzed. The case analysis of the potential path, potential timing, potential sign and potential indication are provided. Further in-depth researches on the application and outlook of the sneak circuit analysis in aircraft design are proposed.

Analysis and Studies on the Multi-channel Crosstalk of Aerocraft Acquisition Systems

CHEN Yu-kun；OU Lian-jun；FENG Zhong-wei；ZHANG Sheng-yan；LIU Dong

2016, 36(4):  68-72.  doi:10.12060/j.issn.1000-7202.2016.04.14

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The data acquisition system is the key subject for the aerocraft telemetry system. Multi-channel crosstalk is the significant subject under high bit-rate transmission. Aiming at the multi-parameter rapid switch of acquisition system, equivalent circuit prototype was introduced. The mechanism of multi-channel crosstalk is theoretically investigated and analyzed. The methods to avoid multichannel crosstalk were proposed. The hardware platform were established to test and verify performance. Test results show that the mechanism of multi-channel crosstalk is correct and the engineering application methods are effective. The methods can decrease crosstalk from different channels, and improve acquisition precision of telemetry parameters.

Characteristics Analysis for the Radar of Helicopter

YANG Zai-qing；XUE Peng

2016, 36(4):  73-76.  doi:10.12060/j.issn.1000-7202.2016.04.15

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In order to study the target of helicopter radar characteristics, the methods of the theoretical analysis, statistical analysis and performance index system analysis method were used. The helicopter and fixed-wing aircraft, target between the helicopter radar characteristics were analyzed. Statistical model of helicopter radar characteristics was established. The statistical results were analyzed. Adopting the method of index system of performance analysis for rotor modulation characteristics was analyzed. The radar characteristic affecting factors and distribution regularity of the helicopter target were acquired. The method and result could be used as design reference to the helicopter, air defense weapon system and helicopter target.

A Time Transmission System Based on Compass Satellite Navigation System

ZHU Jiang-miao；ZHENG Min；HUANG Yan；QIN Hui-jun

2016, 36(4):  77-82.  doi:10.12060/j.issn.1000-7202.2016.04.16

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The time transmission system based on Compass satellite navigation test platform was studied. It regards the satellite common view method as data comparison. The correction value prediction technology and phase compensation technology were used to improve the accuracy and stability of Rubidium clock.This system can be used in the comparison between the local atomic time scale and UTC(NIM) to carry on the comparison to the source on time.It can make the time value of the Compass satellite navigation detection platform be reliable and keep the difference between the local atomic time scale and UTC(NIM) within 10ns to meet the needs of research, development and application of the Compass navigation products .

Design of Angular Displacement Transducer Based on Embedded Assembly Language

MA Ya-jun〓LIU Shu-xuan；REN Hai-yan；WANG Wei；YANG Ming；WANG Yan-kui

2016, 36(4):  83-88.  doi:10.12060/j.issn.1000-7202.2016.04.17

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To satisfy the angular displacement signal measurement and digital transmission of vehicle steering gear shaft, an embedded assembly angular displacement transducer is designed. This transducer receives the center program instruction, then starting the single chip micro controller for acquisition of angular displacement sensor output signal which can be transerred after signal processing. The linearity of the transducer is improved through the development which making the important performance index of 0.05% better than 0.14% of the aircraft system requirement.

Research on Analog Distortion of Signal in Space for Beidou Satellite Navigation System

LIU Rui-hua；ZHAO Qing-tian；CHEN Ying-chao；KONG Yue-ming

2016, 36(4):  89-94.  doi:10.12060/j.issn.1000-7202.2016.04.18

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The failure for signal generated payload of satellite navigation will cause signal distortion. When signal of satellite navigation is distortional, the performance of navigation will be influenced. Therefore, the threat model for analog distortional signal of Beidou is researched and analyzed. The mathematical model for threat model B of Beidou is established and is analyzed theoretically. The formulas of cross-correlation function, power spectrum density and correlation loss are derived, and they are simulated and analyzed. In accordance with the mathematical model for Scurve and Scurve locking point bias of threat model B, S-curve and S-curve locking point bias are simulated and the impact on measurement performance is analyzed. The results demonstrate that the anomaly signal for Beidou will cause pseudorange measurement error. Furthermore, with the greater degree of distortion, the accuracies of Beidou including ranging accuracy and positioning accuracy are reduced, so does the integrity for augmentation system.

Research on Key Techniques of the Beidou RDSS Receiver Test System

PANG Jing；ZHANG Yong-hu；ZHAN Jian-wei；OU Gang

2016, 36(4):  95-100.  doi:10.12060/j.issn.1000-7202.2016.04.19

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The BeiDou RDSS receiver test system was designed in order to satisfy the test requirement of the receiver. The basic components and working principle of the test system were introduced, and some key technologies were analyzed, including the system modeling and simulation, RDSS outbound signal simulation, RDSS inbound signal receiving, signal quality analysis, etc. Finally, the main performance of the test system was listed.

Design of Signal Transmitter Test System Based on Labwindows/CVI

WANG Xu；YAO Lan；WEN Shi-ren；ZHANG Zheng-long；WEI Zhi-qiang

2016, 36(4):  101-104.  doi:10.12060/j.issn.1000-7202.2016.04.20

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According to the test requirement of signal transmitter test system，a software has been designed including the design of UI, measurement program and report generation . The test results show that the software can test the transmitter automatically and meet the demand of industrial test.