Table of Content

25 April 2017, Volume 37 Issue 2

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Design of Ping-pong Buffer Structure for Hyperspectral Infrared Imaging System

ZHOU Yang;YANG Hong-hai;LIU Yong;FU Qiang

2017, 37(2):  1-4.  doi:10.12060/j.issn.1000-7202.2017.02.01

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A ping-pong buffer structure belonging to the hyperspectral imaging system is introduced which can effectively coordinate data transmission and processing speed by comparing with two other common ways of caching. The operation and control principle of ping-pong buffer structure is discussed. Based on the platform which consists of high-speed large-capacity SRAM and high-performance FPGA device，a ping-pong buffer structure to adapt to the hyperspectral imaging data transmission system is designed. Also the RTL simulation and the board-level verification are completed. Experiments show that this structure is efficient at seamless buffering and processing the real-time video data, and effectively improves the efficiency of the system，and proved to be stable and reliable.

Research on Fiber Sensing Measurement for Spacecraft

FENG Zhong-wei；RONG Gang；JIANG Shuang；ZHANG Sheng-yan

2017, 37(2):  5-9.  doi:10.12060/j.issn.1000-7202.2017.02.02

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The application of fiber sensing measurement for spacecraft is explored extensively towards the special requirement and limitation brought by the space environment. The fiber grating is selected from various techniques to transfer the physics such as temperature, pressure into signal. The design and realization of the demodulation for the fiber grating sensing system are analyzed comprehensively. CCSDS recommendations are applied to package and transmit the measuring data. Methods are explored aiming to improve the environmental suitability of the measuring system towards the special requirement of the mechanical and radiation environment. A feasible solution for the measurement of space physical parameter is promoted.

Research on A Type of IR Dynamic Simulation Drone

LIU Sha；WANG Zhan-tao；WANG Tao；LIN Sen；WANG Kai-lei

2017, 37(2):  10-17.  doi:10.12060/j.issn.1000-7202.2017.02.03

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To meet the simulation requirement for the characteristics of the infrared radiation and the motion characteristics of target of a type of seeker, a IR dynamic simulation drone based on extend blackbody is designed, using for simulating setting target and background temperature difference, and the dynamic change of target in the field of view. The basic principle, major component, hardware system design and software realization of the IR drone are introduced, also the radiation characteristics of infrared imaging and  dynamic performance index are verified experimentally.

Design and Implementation of Test System for Gyroscope Platform Based on LabVIEW

JIANG Yang；CHEN Ming-xuan；SHEN Xing

2017, 37(2):  18-21.  doi:10.12060/j.issn.1000-7202.2017.02.04

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Measurement and control of gyroscope platform are problems frequently encountered in the process of modern industrial production and testing. In view of the shortcomings to the traditional testing system of gyro platform, a testing system of gyroscope platform based on LabVIEW is developed. The system takes the PXI-bus computer as the control core, using data acquisition and conversion technology, with multiple signal transformation processing to accomplish the intelligent test system. Testing projects and targets meet gyroscope platform testing requirements.

Research on Data Preprocessing Method of Balance Function Test and Evaluation System

2017, 37(2):  22-25.  doi:10.12060/j.issn.1000-7202.2017.02.05

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In experiment for evaluation of human body balance function, the center of pressure (COP) trajectory measuring method has been widely used. This paper introduces a kind of balance function test system based on FPGA. As the control center of the system, it realizes the measurement of six forces synchronously, calculating the center of pressure (COP) and plotting the trajectory simultaneously. Aimed at the problem that high frequency interference seriously affects accuracy of the measurement, research about reasonable setting of the smooth window in data preprocessing has been carried out. The result shows that using a smooth window which is half the length of the data frame can improve the smoothness of the trajectory effectively. Based on this system, experiment has been carried out using the method of bearing load to evaluate ergonomics. The result shows that this system can evaluate balance function accurately. During measurement, the length of trajectory and the area of envelope curve should be chosen depending on the shaking intensity to evaluate the balance function.

The Evaluating Research on Heat-insulating Property of Thermal Protection Products Used on the Engine′s Gas Cylinders

2017, 37(2):  26-29.  doi:10.12060/j.issn.1000-7202.2017.02.06

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The heat-insulating property of thermal protection products used on the engine′s gas cylinders is evaluated through sampling test under thermal vacuum environment. The product temperature rise which is evaluation requirement is affected seriously by the equipment and engineering process. According to the test method in the heat conductivity coefficient of the insulation material, temperature rising rate as a novel test requirement of evaluating the property of the products is acquired under the same testing process. This method can evaluate heat-insulating property accurately and objectively, and it can eliminate the interference factors in the equipment and engineering process. The heat insulating property of out-of-shape thermal protection products with non-uniform thickness also can be evaluated by the method.

Fault Prediction Method for Liquid Rocket Engine Test Stand Based on ARVM Model

MA Jun-qiang；CHEN Wen-li；YANG Si-feng；SUN Shu-jiang

2017, 37(2):  30-35.  doi:10.12060/j.issn.1000-7202.2017.02.07

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Aiming at the problems of rare faulty samples, low accuracy of fault prediction and difficulty in maintenance and repair of liquid rocket engine test stand，based on the analysis of the advantages and disadvantages of standard RVM, a fault prediction ARVM model with strong adaptive ability is proposed. In order to test this model, the thrust vector of the high-altitude simulation test stand of a certain orbit control engine is predicted using the flow rate and combustor pressure as input parameters. The prediction result shows that, ARVM method can effectively track the trend of the thrust vector parameters, and obtain a higher prediction accuracy and model sparseness. This method has certain theoretical value and engineering application significance for fault prediction and maintenance of complex systems.

Design for a Measurement System of Vibration and Shock Based on Labview

YAN Lei；YANG Xiao-wei；LIU Xin；ZHU Gang；JIAO Xin-xin

2017, 37(2):  36-42.  doi:10.12060/j.issn.1000-7202.2017.02.08

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In order to meet the demands of measuring vibration and shock testing machines, the measurement system is developed. The system is designed by measuring technology of virtual instrument. The system can measure the frequency and amplitude of the acceleration signal, analyse the signal by FFT and realize the measurement. The experimental results demonstrate that the system has several characters, such as perfect testing functions, accurate testing result and simple operation. The system can be used to calibrate all existing vibration and shock testing machines. This system had been used in practice.

Reduction of Dynamic Noise in the Measurement of Shaft Torsional Deformation Based on EMD

YIN Xue-feng；ZHU Yue-qi；JI Xiao-jun

2017, 37(2):  43-48.  doi:10.12060/j.issn.1000-7202.2017.02.09

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A large number of information related to the running state of the rotating shaft is contained in the torsional deformation signal of the shaft. Reasonable method can get more effective signal components, it can help to make correct judgement on the working state of the shaft. Compared with the traditional denoising method, the method based on EMD has a strong adaptability. Effective signal is recovered from the original signals collected from two mutually orthogonal directions, after being filtered outnoise according to the correlation of EMD decomposition. The simulation results show that the method is effective and can be used to the actual rotating shaft to reduce the distortion of the signal.

Discussion on JJG 860-2015 Verification Regulation of  Pressure Transducer (Static)

JIAO Xin-xin；WANG Xiao-san；XIAN Bao-jin；LIU Xin；WANG Hui-long；ZHU Gang

2017, 37(2):  49-53.  doi:10.12060/j.issn.1000-7202.2017.02.10

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Main variations of a new Pressure Transducer (Static) Verification Regulation JJG 860-2015 are introduced. Discussions are carried out on the selection of the test instruments and the verification methods for specific pressure transducers. The necessity of adding two new performance indicators, the zero shift and the cycle stability, is demonstrated according to some test cases. Furthermore, some improvement suggestions for this regulation are proposed.

Study of Material Testing Technology for Space Debris

CHEN Chun-yan；WU Sheng-bao； DONG Xiao-lin；ZHANG Heng-hao；WEI Ming

2017, 37(2):  54-57.  doi:10.12060/j.issn.1000-7202.2017.02.11

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For fast examination of the space debris′composition, the space debris′ source and composition are analyzed, Domestic and international examination technique means aiming at main composition of the space debris are also carried on detailed contrast, a kind of the space debris′examination network project based on the LIBS is adopt. That project has characteristics such as quick analytical speed, high measure accuracy and intelligent degree, diverse vegetable measurable in the meantime, good space adaptability and didn′t need sample to prepare a processing etc. also can carry out full-automation and multi-threading examination process.

Research on Environment Testing System for a Certain Type of Spacecraft Railway Transportation

WEI Xiao-lin；LIU Yong；WU Yue；ZHANG Cong

2017, 37(2):  58-61.  doi:10.12060/j.issn.1000-7202.2017.02.12

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A comprehensive acquisition System of transport environment based on distributed acquisition is introduced. The real-time monitoring measurement of the railway transport environment parameters such as shock, vibration, temperature and humidity is realized. The mass data of the vibration in time domain and frequence domain, temperature, humidity and velocity can be automatic batch managed by the analysis software. Analysis result indicates that the railway transport frame with damping design play a very good damping effect and keep the product safe.

Research on Big-Loop Time Delay in Deep Space Teleoperation

CHEN Yu-kun;RONG Gang;OU Lian-jun;ZHANG Sheng-yan;FENG Zhong-wei

2017, 37(2):  62-67.  doi:10.12060/j.issn.1000-7202.2017.02.13

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Deep space detecting is the important subject for future space development. Teleoperation is the significant domain and indispensably essential technology of deep space detecting. The interactive mode of teleoperation is investigated, and the telecontrol and telemetry interactive process of typical deep space teleoperation closed-loop system is presented. Based on the direct control mode of teleoperation, the parameter of loop time delay is analyzed, and then the engineering calculation methods of loop time delay components are given. A modified way is proposed on dealing with the time of judging telemetry. The theory analysis indicates that the method can greatly improve continuous instruction efficiency, maximize system resource and decrease mission performance time.

Diagnosis of Glow Discharge Plasma by Langmuir Double Probe

GE Meng；ZHANG Li-li；CAI Hui-hua；SUN De-chong；JIA Feng-kai

2017, 37(2):  68-72.  doi:10.12060/j.issn.1000-7202.2017.02.14

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The principle of plasma diagnosis by Langmuir double-probe is described, and the parameters of glow discharge plasma are measured. Electron temperature and electron density are calculated according to the double-probe I-V characteristic curve, and the variations of electron density are analyzed as a function of discharge current. The diagnosed results are compared with results obtained from quasi-optical cavity, and they show good agreement with each other. They have negligible difference and are in agreement of same variation. The reliability and correctness of using Langmuir double-probe to diagnose glow discharge plasma are verified.

The Application of Index Test in Repair and Maintenance for Ship Navigation Radar

HAN Lu；YANG Yang；XION Dong-xu；LI Jian-rong

2017, 37(2):  73-76.  doi:10.12060/j.issn.1000-7202.2017.02.15

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Through the research of marine navigation radar system structure and each function module,the key technical indicators affecting the normal operation of the navigation radar are analyzed in detail.Proposed in the ship navigation radar maintenance work,using the key technical indicators testing of radio measurement equipment,the method is applied in the evaluation of equipment state.Proved by practice,the method is accurate and reliable,and provides a good reference for equipment maintenance.

A Design for Four-terminal-pair Resistor with Calculable AC/DC Difference

TONG Ya-zhen；HUANG Xiao-ding；SONG Jia-yun

2017, 37(2):  77-80.  doi:10.12060/j.issn.1000-7202.2017.02.16

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Now the resistor with calculable AC/DC differemce which is the standard of AC resistor traceability at home and abroad has several types , such as the coaxial type，the quadrifilar type, the octofilar type and the bifilar type. These resistors are usually four-terminal-pair structure. The definition of the four-terminal-pair is the most strictly. Its electromagnetic fields exist in the cylinder body, and do not radiate outside. So the AC resistance measuring meter and the bridge adopt measurement principle of the four-terminal-pair. A four-terminal-pair coaxial resistance with calculable AC/DC difference is introduced. A mathematical model is established, the AC/DC difference and the time constant are calculated. Bg test and comparison, the time constant is verified.

Analysis of D2 Navigation Message and Integrity Performance of BDS

LIU Rui-hua；CHEN Ying-chao；LV Xiao-ping

2017, 37(2):  81-85.  doi:10.12060/j.issn.1000-7202.2017.02.17

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In order to evaluate the effect of BeiDou satellite system(BDS) D2 navigation message to signal in space (SIS) integrity, the BeiDou D2 navigation message was researched in the structure and the content. At first,Through the analysis of basic navigation information, the message and time used in the process for determining satellite position and user position were given. Simultaneously, the user ranging error which influenced by satellite ephemeris and clock was illustrated, the ionosphere and tropospheric error correction model were introduced either. Then, through the analysis of enhanced service information, the calculation method of integrity information (RURA, UDRE) and grid ionospheric delay were discussed. Finally, the calculation method of protection level (PL) for user positioning error that use integrity information and user local error was given.

A Brief Analysis of Three-proof Design Technology for Instrument and Meter Cabinet

FENG Jing-jing；WEI De-lin；WU Chun-yan

2017, 37(2):  86-90.  doi:10.12060/j.issn.1000-7202.2017.02.18

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To develop the instrument and meter served in the marine climate environment ,in addition to consider the performance of conventional design, three-proof design is also one of the important links for the instrumentsand meters structure designerto consider. Through the analysis of the influence of damp, mildew, salt fog to the life of instruments and meters in the sea state, combined with the work in the practical design experience, the three-proof design methods and measures in the instrumentation structural design are summarized and concluded. These methods can effectively improve the protection ability of instrument equipment in Ocean environment.

The Design and Implementation of A Hand-held Calibration Controller

WANG Wu-hua

2017, 37(2):  91-94.  doi:10.12060/j.issn.1000-7202.2017.02.19

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Warship electrical instruments are the main criterion for sailing ships and the shipboard power system, weapon system of state. In view of some disadvantages of the traditional calibration method for electrical instrument, such as low efficiency, the reliable and other aspects of the problems, a hand-held calibration controller has been designed which is lightweight and reliable, and it can control standard source output with the information input, data storage and other functions, to achieve a rapid calibration of the warship electrical instruments in situ. It is proved that the method is feasible, by comparing the test data.

Design of Position Incremental Encoder based on Inductor Sensor

HUANG Jian；ZHAGN Shan-wen

2017, 37(2):  95-98.  doi:10.12060/j.issn.1000-7202.2017.02.20

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In order to solve the problems of easy damage, low reliability and expensive replacement of traditional mechanical contact-based encoders, a design scheme of position encoder using contactless and inductive sensing is proposed. LDC1312 digital inductance sensor is used as the sensing probe to detect the rotating disk with metal. The digital quantity of the sensor is connected with the MSP430F5529 through the IIC interface, and the number of the pulse signal is processed by the MSP430F5529 to achieve the detection of the position of the rotating disc.Compared to the design of mechanical contact-based system, it has the advantages of high reliability, long life and for used in moisture, dust and other harsh environments.