Table of Content

15 December 2015, Volume 35 Issue 6

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Research of Dynamic Test Method of Stage-gap Clearance Sensor

CHEN Xiao-hui；SUN Zeng-yu；ZHENG Ming-zhu；GUO Li-zhen；TAO Yong-ming

2015, 35(6):  1-4.  doi:10.12060/j.issn.1000-7202.2015.06.01

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Aiming at the clearance sensor measurement requirements used in the separating plane of the certain rocket, a new dynamic test method of the clearance sensor is proposed and the measurement system is designed. Through the laser testing method, the output response of the clearance sensor CI1-27 is tested and memorized. The actual application shows that the new method has convenient operation and high reliability, it can also has the reference significance for the dynamic test method of the clearance sensor.

Analysis of the Angle Deviation in Radio Compass Caused by UHV Transmission Line

ZHOU Cheng-lu；WENG Mu-yun

2015, 35(6):  5-9.  doi:10.12060/j.issn.1000-7202.2015.06.02

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Ultra high voltage (UHV) transmission line corona is one of the main interference sources of Airport Non-direction Radio Beacon. According to the working principle of radio compass, the radio relative azimuth angle deviation measured by airborne radio is given theoretically. The angle deviation is simulated on the condition of different frequency, distance between non-directional radio beacon and transmission line. The study shows that with the interference caused by corona discharge, the radio relative azimuth angle deviation measured by airborne radio increases with the increase of distance and changes steep leveled off with the increase of frequency.

A Design for Dual-redundancy LVDT Displacement Sensor

JIANG Xiao-tong；LIU Jun-qin；WANG Shou-hao

2015, 35(6):  10-13.  doi:10.12060/j.issn.1000-7202.2015.06.03

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A kind of dual-redundancy LVDT displacement sensor and its converting circuit are introduced. To achieve dual-redundancy displacement measuring by the structure in series and the function in parallel, the differential transformer with series redundancy structure is designed. To solve the problems of low linearity which is the inherent characteristics of series dual-redundancy LVDT displacement sensor and unable to meet the target requirements of system, the method of digital fitting is used to measuring parameters. Then the linearity of measurement signal and control precision of system are improved; debugging time is shortened; efficiency is enhanced and the requirements of high reliability for the control system of new generation are met.

Orbit Calculation Method of Autonomous Navigation Constellation Parallel Systems

LIU You-hong；HUANG Wen-de；SHENG Li-yuan

2015, 35(6):  14-18.  doi:10.12060/j.issn.1000-7202.2015.06.04

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In order to provide a monitoring and evaluation platform for the navigation constellation autonomous operation, a parallel system consisting with real satellite navigation system is need to be constructed. To solve the orbit calculating problem of high-fidelity simulation system, the theory of parallel systems is introduced, and the high-precision orbit calculation and prediction method is proposed based on the analysis of historical precise orbit.To make the results of orbit calculation keep highly consistent with the actual system,the continuous renewal precise orbit is taken as inputs ,also the time-varying weighting method or PID incremental algorithm is applied to data smoothing. The results show that the satellite orbit calculation results keep an order of decimeter with the actual orbit.

Research of Online Evaluating Method of the Static Heaviness of Airship Based on Laser Rangefinder

HUANG Wan-ning；HE Ze-qing；MIAO Jing-gang

2015, 35(6):  19-24.  doi:10.12060/j.issn.1000-7202.2015.06.05

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Through splitting the model of airship′s ballonet in CATIA, the values of the volume under different height of the ballonet was obtained. The least square method was used to establish the cubic curve fitting formula of ballonet’s center height and volume, and the phase laser rangefinder was used to get the height of the ballonet, so the volume of ballonet was calculating in real time by this formula. Furthermore, the static heaviness of the airship was evaluated and the pressure height of the airship and the ability of taking off and landing were abstained. During a flight test，the values of the height of ballonet was used to calculate the airship′s static heaviness, these results agreed with the weighting data on ground every time before taking off. It validated the feasibility of evaluating the static heft online by laser rangefinder. During a flight test, this method was used to analyze the variation the static heaviness and the pressure height was validated.

Discussions on Angle Quantity as the Basic Quantity

SUN Fang-jin；SHANG Qiu-fang

2015, 35(6):  25-27.  doi:10.12060/j.issn.1000-7202.2015.06.06

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In International System of Units（SI），the plane angle is a derived Quantity，and its unit “Radian” is an auxiliary unit. But the plane angle is neither derived from the length base unit, nor traced to it, so the deriving relationship between the plane angle and the length basic unit could not be established. The plane angle has wide applications, important effects and unique performances, which is accordant with the demands of basic Unit. Therefore the suggestions are proposed for discussions as follows: the plane angle, “angle” for short, is a basic quantity; the unit of the plane angle“degree, angular minute and angular second”, is basic unit.

Development of Dynamic Thrust and Thrust Vector Measurement System for Orbit and Attitude Engine

GENG Wei-guo；ZHU Zi-huan

2015, 35(6):  28-32.  doi:10.12060/j.issn.1000-7202.2015.06.07

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Aiming at the problems of the low measurement accuracy, incomplete test coverage and complex operation of the dynamic thrust and thrust vector measurement system for orbit and attitude engine at present, the track dynamic thrust and thrust vector measurement system based on the piezoelectric force measurement platform is developed.The optimization design technology of structure parameters of the measurement force, the standard signal generator design technology, the interphase interference processing technology and so on five key technical points have been overcome.The measurement of the continuous pulse force and multi direction force has been realized , the system operation is reliable and convenient, the general requirement is met for the test targets ,the means of dynamic thrust and thrust vector test is provided .

Research for the Stability of Fatigue Test Bench Based on A Straight Pipe and A Bend Pipe

ZHANG Ya-kui ；ZHOU Rui-xiang；ZHANG Jin

2015, 35(6):  33-37.  doi:10.12060/j.issn.1000-7202.2015.06.08

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In order to study the pressure of a lifetime-determination experiment bench of a certain type of aircraft engine fan blade and reach the purpose of improving the stability of the test loading force, the method of simulation has been used. First, we established the experiment bench model based on MATLAB/SimHydraulics. Then, on the basis of the system model, we completed the research of the front line of the accumulator: study the different influences of the system pressure pulsation and load stability when the front line are straight tube and bending tube respectively. Last, simulated step by step by changing the curvature of the bend pipe. From the study we found that the simulation of highlow cycle fatigue test rig has reached the expected purpose based on bend pipe. The bend pipe with large curvature radius can increase the stability of the loading effectively under the experiment bench and steady the pressure of the system. In conclusion, this study provided necessary guidance to the design and production of experiment bench,  so that we can get better lifetime determination results.

Research on Build-up Force Calibration Device for Multi-Component Force Sensor Based on Double-force Source

LUO Xiao-ping；Weng Jun；Ni Bo

2015, 35(6):  38-43.  doi:10.12060/j.issn.1000-7202.2015.06.09

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An overview of the design and development of a double-force source calibration device for multi-component force sensors based on build-up force standard machine is presented. The measurement uncertainty of the device is analyzed. The device was submitted to tests on three-component force sensor to demonstrate successfully its ability in calibrating individual components for multi-component force sensors, and the coupling error calibration can also be realized easily.

Scheme Research on Cryogenic Flow Weighting Calibration System

WANG Zhan-lin；ZHOU Lei；WANG Shi-lei

2015, 35(6):  44-47.  doi:10.12060/j.issn.1000-7202.2015.06.10

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It is critical for the measurement accuracy of flow rate in the liquid rocket engine test. Different from the flow rate measurement at normal temperature, there are many special characters in flow rate measurement for cryogenic propellant. The principle and scheme of the calibration for cryogenic flow rate in weighting method are introduced. The formulas of ullage flow rate in inflow and outflow conditions are deducted. In the discussion of thermal stratification of ullage, the heat and mass transfer mechanisms in cryogenic tank are considered. In the end, it draws a conclusion that inflow weighting method leads to higher accuracy to calibrate the cryogenic flow meter, because of the better stability of ullage flow rate in the inflow method.

Application of Improved Wavelet Threshold De-noising Method in Pipeline Leakage Detection

CHEN Cheng-bo；SHI Ming-jiang；LI Wei

2015, 35(6):  48-52.  doi:10.12060/j.issn.1000-7202.2015.06.11

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Negative pressure wave signal denoising is one of the core issues to be solved in pipeline leakage detection method based on negative pressure wave. A comparison among traditional hard and soft threshold function, hyperbolic and exponential algorithm and improved algorithm has been made on the basis of analyzing wavelet transform theory and wavelet threshold denoising. The results of experiment show that improved algorithm used in pipeline leakage detection processing could obtain a larger SNR (signal to noise ratio) and a good denoising ability for negative pressure wave signal, which could effectively improve leakage detection accuracy.

Design of Verifing Scheme for Weight Calibration Capability

LI Tie-peng；WANG Xiao-san

2015, 35(6):  53-58.  doi:10.12060/j.issn.1000-7202.2015.06.12

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Drawing lessons from the principle and method of mass supervision system and combining the rule and characteristics of capability verification，the design process of weight capability verification scheme is elaborated, judging of design scheme, laboratory dividing，sample delivers，result report releasing are concretely analyzed. Through verifing the design scheme is reasonable, Control effect is good.

Technology Reseach on Pressure Sensor Conditioning Circuit Supplied by Single Power

WANG Yan-kui；HU Xiao-ping；WANG Zhen；YANG Ming；ZHU Ting-wei；MA Ya-jun

2015, 35(6):  59-63.  doi:10.12060/j.issn.1000-7202.2015.06.13

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To the Larger zero voltage output and dead zone of the pressure sensor supplied by single power, theoretical analysis is made,the main cause is found and valid measure is used.The foundations for the commercialization & industrialization of the pressure sensors are laid.

Research on Performance Bound Against Narrowband Interference of Satellite Spread Spectrum Signal

WANG Ming；LI Chang-geng

2015, 35(6):  64-67.  doi:10.12060/j.issn.1000-7202.2015.06.14

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The anti jamming performance of transceiver relations security of inter-satellite links system, under high precision ranging and limited spaceborne processing capacity， increasing anti-interference part will increase the complexity of the transceiver and the introducing ranging error, so quantitative analysing natural ability against narrowband interference of spread spectrum ranging can provide decision to not need to take anti-jamming measures, under what conditions. It is important for optimizing system design. The paper takes the performance bound of against interference of inter satellite link transceiver as the research target. Researching on the key technical issues by quantitative calculation, analysis, design experiment test method and system, achieved the desired purpose.

Research on Calibration of Equipment Delay Time and Monitoring Technology

JIANG Han-yuan

2015, 35(6):  68-72.  doi:10.12060/j.issn.1000-7202.2015.06.15

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The calibration error of equipment delay time is an important factor for events recording and intersection positioning in range measurement and control system. The accurate calibration is an important technology to achieve equipment time synchronization. Research on the equipment delay time problem, a clear physical definition of equipment delay time is put forward, which is easy to be measured. The calibration of the equipment time delay in discrete site is realized. Based on the improved B code, the effectiveness of monitoring the calibration of equipment time delay is verified. The test results show that the delay time calibration precision and accuracy reached ten microseconds.

Design and Realization of Unmanned Helicopter Autonomous Take-off and Landing on Ship

LIU Guan-xin；ZHU Wen-lai

2015, 35(6):  73-76.  doi:10.12060/j.issn.1000-7202.2015.06.16

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The process of the unmanned helicopter autonomous take-off and landing on the ship is analyzed. The autonomous take-off and landing control strategies are designed. According to the strategies, an autonomous take-off and landing system of unmanned helicopter on ship is realized, which provides the theoretical basis and technical support for the design, manufacture and use of unmanned helicopter on ship.

Analysis and Countermeasures of the Fault for Feedback Potentionmeters in Servo System

GAN Lin；LI Wen-zhang；CUI Xin-yu

2015, 35(6):  77-81.  doi:10.12060/j.issn.1000-7202.2015.06.17

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Potentiometer with simple structure, stable performance, adapting bad environment characteristics, widely was used in servo system. However, the unusual and interrupt of potentiometer output signal caused the servo system performance degradation or not work, even seriously impacted on the use of servo system. According to the application situation of feedback potentiometer in the servo system over the years, the reason of potentiometer output abnormal mainly were brush fracture, loosen rivets, gasket rupture, wire fracture, join between brush and the center silver belt , having excess or defects on the surface of resistance film and conductive strip etc. The cause of the failure was determined by the failure mode analysis. The suggestions and methods of eliminating faults were presented, and were applied in the production process of feedback potentiometer. Thus the reliability and safety of the servo system have been improved.

A Design of Multi-channel Electronic Loader

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

2015, 35(6):  82-85.  doi:10.12060/j.issn.1000-7202.2015.06.18

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Electronic Loader has been widely used in the Aero System, but the function of every device used to different power equipment is different from each other. A kind of multi-channel electronic loader used in aerosystem is introduced.Three parts of the device are mainly disscussed in detail, inluding the power supply, the loads circuit, the current display and the fan control part.From the testing of the electronic loader, it can be concluded that the user′s demand is satisfied by this device because it can run steadily and safly for a long time.

Application of PSO Neural Network for Fault Diagnosis of Optical-electronic Detection Equipment

DENG Jun；ZHOU Yue-wen；YANG Zhao；LIANG Peng；ZHANG Ming-ming

2015, 35(6):  86-91.  doi:10.12060/j.issn.1000-7202.2015.06.19

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Aiming at the low detection rate and long diagnosis time of the traditional neural network methods, particle swarm optimization (PSO) is used to train neural network and optimize connection weights. It is applied to fault diagnosis of optical-electronic detection equipment. Compared to BP and GA, the experiment results show that PSO neural network can improve the fault detection rate, decrease the false alarm rate of optical-electronic detection equipment and fault diagnosis time, and be realized more easily. Therefore, It gets better effects of fault diagnosis.