Table of Content

15 August 2013, Volume 33 Issue 4

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The Design and Utilization of Inductosyn Angular Testing System Based on RDC

LIU Li-yan；ZHANG Xin-lei；KOU Shu-hui；TANG Sheng-quan

2013, 33(4):  1-3.  doi:10.12060/j.issn.1000-7202.2013.04.01

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The scheme of inductosyn angular measurement system based on RDC（Resolver-to-Digital Converter） is designed and utilized. By utilizing the complete monolithic resolver-to-digital converter,the structure of angular measurement system is simplified, its reliability is improved, and the cost of table is reduced.

Design of A Displacement Sensor Based on Linear Variable Differential Transformer in High Temperature and High Pressure

GAN Lin；JIANG Xiao-tong；LI Wen-zhang；ZHU Ting-wei；WANG Yan-kui

2013, 33(4):  4-9.  doi:10.12060/j.issn.1000-7202.2013.04.02

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To satisfying the requirements of accurate measurement displacement in the complex environment of high temperature and high pressure, a displacement sensor with high accuracy and low shift is designed. Compared with the traditional LVDT, new structure, new technology, new materials and 7JHB0187 are used in the process of sensor development to adapt high temperature and high pressure environment. The sensor parameters meet the application requirements. Also, the applications of the sensor is expanded.

Reseach on the Arithmetic of Circular Inductosyn Signal Based on the AD2S1210

ZHANG Xin-lei；TANG Sheng-quan；LIU li-yan；GAO Yang

2013, 33(4):  10-12.  doi:10.12060/j.issn.1000-7202.2013.04.03

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An Arithmetic of Angular measurement systerm of Inductosyn signal is designed，and it be detailed. When goniometric systerm began to work ,the method gived a software solution to get the integer angle value ，which just parsed the data that converted form inductosyn signal by AD2S1210. As a result ,the method predigested the hardware circuit of goniometric systerm and enhanced the  goniometric realtime ability.

A Measurement of Smooth Ring Gauge Based on the Mahr PLM1000 Measurement Machine

LIANG Hai-long；YANG Lei；YU Le

2013, 33(4):  13-16.  doi:10.12060/j.issn.1000-7202.2013.04.04

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The principle and operation method of measurement of smooth ring gauge based on the Mahr PLM1000 are introduced. This approach is compared with traditional measurement methods, and the advantages of the proposed method are justified-simple , convenient, efficient,and low in error .Results demonstrate that it is superiority compared to the traditional methods.

Attitude Calibration on Three-line Array CCD Camera of Space Stereo Mapping

HUANG Gui-ping；Qin Gui-qin；MA Kai-feng

2013, 33(4):  17-20.  doi:10.12060/j.issn.1000-7202.2013.04.05

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One method for calibrating the transformation matrix of cubic prism coordinate system between stereo mapping camera and star sensor was adopted. Autocollimation on two cubic prisms was finished using 4 theodolites. After that, the cubic prism coordinate system was set up. And the detailed equations of rotation matrix were deduced too. The attitude between two cubic prisms was calibrated by azimuth transmission. Tests indicate that the calibration error of angle between two cubic prism coordinate system axes is less than 1.5″(1δ）. The error of final attitude calibration of the stereo mapping camera is less than 5″（1δ）.

Measurement Method of An Ultra-Low-Speed Turntable′s Rate Index

WANG Ming-yuan；YU Hai-sheng；YANG Lian-chun；ZHANG Xin

2013, 33(4):  21-23.  doi:10.12060/j.issn.1000-7202.2013.04.06

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The measurement method of the rate error,rate steady and the rate resolution for an ultra-low-speed turntable(0.000 01 ° / s ~ 0.000 1 ° / s) is introduced.The measurement method using the triangulation method, rate index is measured by measuring the displacement of a line within the predetermined time, the angular rate′s measurement results are calculated by corresponding formula.By actual measurement and measurement uncertainty analysis,the measurement method meets the measurement requirements of the ultra-low-speed turntable′s rate error, steady and rate resolution. This measuring method can not only solve the problem of detection in the actual work, and also helps to improve the development level of the ultralow speed turntable, in particular the speed of 0.000 01 ° / s rate table.

Study on A New Type of Hydraulic Control System and Its Application

2013, 33(4):  24-27.  doi:10.12060/j.issn.1000-7202.2013.04.07

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A new type of hydraulic control system and its application are introduced. Based on analyses of the disadvantages of the normal hydraulic control system, some peculiarities are presented such as the differential flow, servo motor working at adequate speed and constant leak. A repeatability of 0.015% is achieved in the buildup force standard machine with the hydraulic control system. It has great consultant significance for study of build-up force standard machine with it.

Optimization Design of Aerodynamic Shape for the Low Level Height Keeping Tow Target

CHEN Feng

2013, 33(4):  28-32.  doi:10.12060/j.issn.1000-7202.2013.04.08

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First, the primary aerodynamic configuration layout of the low level height keeping towed target is defined according to practical method and using requirements.Then, mathematical model of the optimization issue is established,and the parameters pertinent to lift-drag characteristics of the tow target are selected as design variables to determine the sample space,and the sample points are produced by Latin hypercube method, then the surrogate model is constructed and the aerodynamic shape is optimized by the application of the surrogate model optimization method based on the platform of iSight.In the end,the optimized results are taken as the basis for aerodynamic configuration,and the aerodynamic analysis is carried out with the three dimensional CFD software using the results of the optimization.

The Effect of Environment Factors on Unmanned Helicopter Landing Warship Control

YANG Zai-qing；WEI Xiao-heng

2013, 33(4):  33-38.  doi:10.12060/j.issn.1000-7202.2013.04.09

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The air flow and ocean wave are the key environment factors of the unmanned helicopter landing warship control.From the view of engineering practice,the main effects of air flow and ocean wave characteristics to the landing warship control are researched.The main measures of the unmanned helicopter landing in the warship control to overcome the adverse effects are proposed.It is available for study and reference.

Application of Generalized Regression Neural Network in Short-time Prediction for Satellite Clock Error

LEI Yu；ZHAO Dan-ning

2013, 33(4):  39-44.  doi:10.12060/j.issn.1000-7202.2013.04.10

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Neural Network(NN) has been widely used in forecast of nonlinear systems over the past years. Generalized Regression Neural Network(GRNN), which is a new kind of NN, is proposed to predict satellite clock error because of its nonlinear characteristic. An slip window pattern is used organize sample data, which can raise utilization rate of data. In order to improve forecast ability of GRNN, the method called K-fold Cross-Validation is employed to train network. Furthermore, the optimal smoothing factor is determined in terms of Root Mean Square Error(RMSE). An experiment is carried out to verify GRNN effectiveness. Real satellite clock error data from International GNSS Service(IGS) is trained to construct the GRNN model, then this model is used to predict clock error. And also Clock error is forecasted using quadratic polynomial. Results show that GRNN model can reach ns-level prediction accuracy within 24 hour. Moreover, GNRR is more stable in comparison with quadratic polynomial. GRNN is worse than quadratic polynomial when predicting linear clock error, however, the former is obviously better than the latter when nonlinear clock error.

Research on A High-Power LED Driver Circuit Based on APFC

ZHANG Chang-qian；LI Hong-jian；XU Ren-bo

2013, 33(4):  45-49.  doi:10.12060/j.issn.1000-7202.2013.04.11

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A high-power LED driver circuit is investigated based on Boost principle and active power factor correction (APFC) technology.  By using average current control method to control the circuit with a double closed loop control system composed of one current loop and one voltage loop,power factor correction and reducing the input total harmonic distortion through input current tracking input voltage is realized. Simulation results show that this circuit is feasible for a high-power LED driver by PSIM software.

A Method of Measurement Resistance with Small Current

WU Dong-jian；JIANG Zhu；XU Chao；WU Yong-hong；MA Chen

2013, 33(4):  50-53.  doi:10.12060/j.issn.1000-7202.2013.04.12

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The method of measurement resistance with small current is introduced. The method is used in the measurement field which is asked for small current and low voltage，It resolves the problem of fussy, time-consuming, low accuracy, jamming in measurement resistance with small current. It improves the efficiency, security and accuracy in measurement resistance.

Design and Realization of Frequency Calibration for Rubidium Frequency Standard Based on Multi-reference Source

PENG Zheng-qin；ZHAI Hao；LU Fang；WANG Shi-wei；ZHANG Jun；LIANG Yao-ting；WEI Li-xun；ZHAGN Zhao-rui；CUI Jing-zhong

2013, 33(4):  54-57.  doi:10.12060/j.issn.1000-7202.2013.04.13

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The theory of frequency calibration and the error analysis for rubidium frequency standard are introduced. A scheme based on multi-reference Source for frequency calibration is presented, can calibrate frequency from GNSS/BEIDOU receicer’s 1PPS/IRIG-B(DC) code and primary frequency standard’s 10MHz ,can meet users’ demands about calibration time and the accuracy by selecting different calibration time as 100s、1 000s and 10 000s.

Hot Standby System with time Server Based on Embedded Linux

YANG Ying；GUO Wei；DONG Dao-peng

2013, 33(4):  58-61.  doi:10.12060/j.issn.1000-7202.2013.04.14

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Providing incessant time services for time server system, the current solution is the hot standby technique. With embedded Linux and hot standby technology, an time server hot standby system is designed, in which the AT91SAM9X25 embedded micro-processor is used as the key part to build the hardware platform. This function promotes the availability of the system. The experimental results indicate that the system is stable, and Hot-Standby is realized.

Optimization Design of Horizontal Stabilizer for Mini-UVA

AN Jia-ning；CHEN Xiao-kun

2013, 33(4):  62-64.  doi:10.12060/j.issn.1000-7202.2013.04.15

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A multi-objective optimization method was advanced to make the drag and structure mass minimum of horizontal stabilizer based the precondition of meeting flying qualities. After the optimization，the longitudinal stability reduced，the longitudinal control performance increased. This method has referential meaning for the design of horizontal stabilizer for Mini-UVA.

Development of Unattended Hand α and β Pollution Monitor

WU Li-gang；LI Bin；LI Meng-rui

2013, 33(4):  65-66.  doi:10.12060/j.issn.1000-7202.2013.04.16

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A new type of unattended α and β pollution monitor is introduced.The monitor is easy to carry and install, able to monitor α and β automatically and simultaneously. The secondary pollution problem in the monitoring process is avoided on the structural design. It has a very important significance to prevent the proliferation of nuclear pollution and the safety of field staff.

Research on Frequency Conversion Loss Measurement Based on Mismatch Correction

SANG Zhi-yong；GAO Shen-xiang；HUO Ying；HAN Lu

2013, 33(4):  67-70.  doi:10.12060/j.issn.1000-7202.2013.04.17

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As a main measurement parameter of mixers’ transfer characteristic, a new frequency conversion Loss measurement method by VNA with a frequency conversion option is proposed. Conclude from measurement result and analysis, the mismatch error is a large contribution to the whole measurement error. An algorithm correction model is proposed to correct the measurement result. Power calibration is adopted to improve the measurement accuracy of VNA. Along with simplifying the measurement mechanism and measurement process, the new measurement method improves the measurement accuracy and repeatability as well.

The Method Analysis of Traditional Precision Recovery of UAV

CONG Shu-quan；JIANG yang

2013, 33(4):  71-74.  doi:10.12060/j.issn.1000-7202.2013.04.18

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It is often caused to fails by the confinement factors such as wind speed,wind direction and geographic condition for the traditional recovery of UAV. The algorithms of the UAV flight control are improved using the wind direction and the floating distance during the recovery and enlarging the relative recovery area to solve this problem and to make a precise recovery.

Uncertainty Evaluation of Measurement Oil in Compressed air by Infrared spectrophotometry

BAO Jing；WANG Yu-qin

2013, 33(4):  75-78.  doi:10.12060/j.issn.1000-7202.2013.04.19

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After being collected the oil of compressed air by carbon tetrachloride, oil in the compressed air was determined by infrared spectrophotometry. According to Guide to the Evaluation and Expression of Uncertainty in Measurement(JJF 1059.1-2012),the uncertainty of measurement of the content of oil was evaluated. The influence factors of uncertainty were found out,and the components of uncertainty were calculated and evaluated. As the content of oil in compressed air was 5.52mg/m³, the expanded uncertainty was 0.68mg/m³.