Table of Content

25 August 2019, Volume 39 Issue 4

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Development Survey of Space Power System Life Prediction

YANG You-chao；LI Hai-wei

2019, 39(4):  1-5.  doi:10.12060/j.issn.1000-7202.2019.04.01

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During spacecraft working on orbit, the performance of power system will be suffered degradation as the issue of space environment and power system’s working characteristics. The reliability and working life of space power system can be affected directly. Based on the working theory of space power system, the main factors which lead to the degradation of power were confirmed. In combination with the research progress in power life prediction, the difficulty and the subsequent main study direction in life prediction were bring forward. The studies can contribute to the engineering application of life prediction.

Study on Impact of Thermal Deformation of Collimation Optical System on the performance of Solar Simulator

LIU Yan；HUANG Chao；WANG Tao；WANG Chun-xi

2019, 39(4):  6-12.  doi:10.12060/j.issn.1000-7202.2019.04.02

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In order to provide a reliable technical basis for the thermal management of solar simulator system, the impact of the thermal deformation of collimation optical system on the performance of solar simulator is researched. A typical collimation optical system of the solar simulator is taken as the object of study. The finite element analysis software is applied to simulate the temperature and thermal deformation of the lens in actually working condition. Then, the Zernike coefficients fitted by deformation date of each lens are imported in the optical software to analysis the influence of the thermal deformation. The results show that the thermal deformation of collimation optical system causes ±1′ collimation angle error and 41.3% irradiance nonuniformity without temperature control, which beyond the reasonable range and need temperature control. Finally, the relationships between the convection and the collimation angle error and the irradiance nonuniformity caused by thermal deformation are analyzed for guiding the design of air cooling radiator, which will direct the design of air cooling system more explicitly.

Laser Scanning and Measurement of Thrust Chamber Based on Reflectance Method Technical Research

WANG Xin-yong；GUO Li-zhen；CHEN Xu-hui；XU Liang；HAN Jun；SONG Nan

2019, 39(4):  13-15.  doi:10.12060/j.issn.1000-7202.2019.04.03

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According to the special thin-walled rotating body structure of the thrust chamber parts, the laser scanning measurement method is applied to the non-contact measurement to avoid the measurement error caused by the contact deformation caused by the contact force in the conventional contact measurement. The cavity structure or parts' blocked can be measured by using reflection method. The inaccuracy that was generated in the coordinates exchanging can be avoided due to single station mode. In this paper, analyzes the process methods. And this method can be certificated though actual parts measurement experiments. The measurement problem of thrust chamber parts is solved effectively. Reflection laser scanning  measurement method can be extended to other similar large-size thin-wall parts.

Research on Spatial Position Measurement Technology Based on Monocular Vision Theory

WANG Kai-lei；WU Yue；SHA Chun-zhe；LIU Sha；WANG Chun-xi；WANG Zhan-tao

2019, 39(4):  16-21.  doi:10.12060/j.issn.1000-7202.2019.04.04

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Space position measurement is widely used in Geodesy and attitude measurement. In order to improve the automation of space position measurement, the spatial imaging equipment is established by using the monocular vision principle, and the spatial coordinates of the three dimensional space are converted into two dimensional image coordinates, thus the spatial location of the monocular vision is measured. The basic imaging equation of monocular vision positioning is deduced, the positioning device is established, and the actual positioning experiment is carried out, and the expected measurement results are achieved，and has good popularization and application value.

Calibration Technology of the Passive Wireless SAW Pressure Sensor

BAI Tian；YAN Lei；SUN Feng-ju；FENG Hui；WANG Xiao-san；CHENG Li-na；LI Hong-lang

2019, 39(4):  22-27.  doi:10.12060/j.issn.1000-7202.2019.04.05

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Surface acoustic wave (SAW) pressure sensors have been got more attention by both domestic and foreign research institutions recent years as a new kind of sensor which have the benefits of wireless and powerless transmission features and could break through the limitation of wire connections for the traditional sensors. The calibration technology of SAW pressure sensors was discussed and the calibration of a kind of commercial sensor was carried out. The calibration results were processed by the least square method and the uncertainty was evaluated. The results showed that the sensor can meet certain accuracy requirements on the index such as error, linear and repeatability. This sensor is quite hopeful to get practical application in the aerospace engineering after further development.

Research on Wireless Transmission Technology of Power and Information Integration for Cableless Spacecraft

LIU Fei；LIU Wen-wen；ZHANG Sheng-yan；WANG Jian-kang；ZENG Gui-ming

2019, 39(4):  28-32.  doi:10.12060/j.issn.1000-7202.2019.04.06

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Aiming at the complex and heavy problem of connecting cable network between electrical equipments of spacecraft, a wireless transmission technology scheme of power and information integration for cable-less spacecraft is proposed, which can realize wireless interconnection between equipments in spacecraft and between spacecraft and ground. The key technologies faced in the application engineering are analyzed, and its application is expounded. The prospects provide new ideas and solutions for the fast integrated design of spacecraft electrical system in the future.

Establishment of Impact Acceleration Calibration Device by Pneumatic Piston

NI Bo；TIAN Fang-yi；SHA Jiang；MAO Zhi-yong；WENG Jun；LUO Xiao-ping

2019, 39(4):  33-37.  doi:10.12060/j.issn.1000-7202.2019.04.07

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According to the method of comparison to a reference transducer, the approach for the calibration of impact acceleration is studied. Based on technology of impact excitation by pneumatic piston and technology of data acquisition by PXI bus, impact acceleration calibration device is established. The calibration software is programmed on LabVIEW, and the measurement uncertainty of device is evaluated. The calibration device can be used for national defense products shock test traceability of impact acceleration.

Research on the Split and Open Type High and Low Temperature Test Chamber

GAO Bing-tao；YANG Xiao-wei；LIU Yun-ping；MEI Hong-wei；ZHONG Shan；WANG Hui-long

2019, 39(4):  38-40.  doi:10.12060/j.issn.1000-7202.2019.04.08

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The split and open type high and low temperature test chamber is introduced. And the composition of its structure is described in detail. The test results show that the temperature range of the high and low temperature test chamber is -80℃~400℃, the temperature deviation is ±2℃, and the temperature uniformity is 2℃. The device can be used as a special device for the calibration of the force sensors at high and low temperature conditions, providing the required high or low temperature test environment for the force sensor.

Experimental and Simulation Study of WindInduced Based Piezoelectric Generator

LU You-song；ZHANG Da-you；ZHAO Qiao-ran；SUI Li

2019, 39(4):  41-46.  doi:10.12060/j.issn.1000-7202.2019.04.09

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With the development of low-power MEMS device, more and more micro-generators have emerged, of which piezoelectric generators are typical representatives. This paper intends to conduct experimental and simulation study on WindInduced Based Piezoelectric Cantilevers. The main contents include two parts. First, establishing fluid-structureinteraction simulation model and analyzing mechanical environment and flutter mechanism of flexible beam submerged in axial flow. Second, investigating the voltage output characteristics of piezoelectric cantilever under the conditions of subcritical flutter velocity and supercritical flutter velocity. The output voltage and the charging performance under the conditions of subcritical and supercritical flutter velocity are explored.
The results show that the peak output voltage is approximately 20V under the conditions of supercritical flutter velocity and close to zero under the conditions of subcritical flutter velocity. A single piezoelectric cantilever can charge a 10μF capacitor up to 22V in 10s. This paper illustrates the possibility of charging low-power MEMS devices with Micro-piezoelectric generators.

Design and Simulation of the Calibration System of Electrostatic Field Tester

YUAN Ya-fei；FENG Na；ZHANG Yu；MA Shan-shan；JI Qi-zheng

2019, 39(4):  47-51.  doi:10.12060/j.issn.1000-7202.2019.04.10

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The accurate calibration of the electrostatic field tester is of great significance for improving the detection precision of the space plasma field, ensuring the safe launch of the satellite, and accurately predicting the lightning and so on. Based on parallel plate capacitor, a calibration device was designed for the calibration of the electric field instrument. The standard electrostatic field generator was simulated by three-dimensional electromagnetic simulation software CST, the field distribution of inside and edge of calibration box was studied and the influence of the standard plate diameter and spacing on the edge effect was analyzed. Based on influence of the plate parallelism on the electric field uniformity, the best location of the electric field probe was determined, and the optimal design of calibration device was realized.

A Quantitative Control Method for Screw Tightening Torque of Liquid Rocket Engine Test-stand

MA Jun-qiang；LI Zhi-gang；SONG Zhen-long；JIANG Yu

2019, 39(4):  52-57.  doi:10.12060/j.issn.1000-7202.2019.04.11

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In order to improve the reliability of liquid rocket engine test-bed, a quantitative control method of screw tightening moments is proposed. Based on the statistics and analysis of moment values in non-test and test environment, the tightening torque range is determined and the rationality of the range is verified by the theoretical calculation of tightening moment strength. Combining with the specific characteristics of the space position of the test bench, the method and process of torque quantitative control for different space positions are determined and have been applied in actual test. The results show that the method proposed can effectively improve the reliability of engine test process.

The Testing Method of Releasing Parameter for Microsatellite

CHEN You-mei；FU Bi-hong；YU Cheng-feng；JI Yan-chao

2019, 39(4):  58-61.  doi:10.12060/j.issn.1000-7202.2019.04.12

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The releasing progress of microsatellite on orbit is simulated by the free-fall method. The releasing speed is tested by high-speed photography，realeasing attitude and shock response are tested by the testing system assembled in the satellite . By this testing method can test the releasing speed、the releasing attitude and the releasing shock response simultaneously.

Design of an Integrated Test System for Satellite PCM TM/TC and Time Synchronization

YANG Tong-zhi；ZHOU Ru-zhi；SHENG Kai-ming

2019, 39(4):  62-66.  doi:10.12060/j.issn.1000-7202.2019.04.13

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Remote control telemetry and time synchronization are the basic function of satellite platform electronic system, whose performance is related to the safety and utility of satellite. In the past, the joint debugging of the platform electronic system used disordered and inconvenient single test equipments, so an integrated test system for PCM TM/TC and time synchronization performance verification is designed. The PCM test equipment can be adapted to the TM/TC requirement of different bit rate and format, and seamlessly integrate comprehensive test software of various functions to perform data processing. Based in the principle of trigger time latch, the high-precision validation method and test equipment for time synchronization are designed.

Design of Precision Measuring Method and System for Swirl Slots of Fuel Nozzles

BI Chao；E Ma-lan；HAO Xue；LIU Yong

2019, 39(4):  67-72.  doi:10.12060/j.issn.1000-7202.2019.04.14

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In order to achieve the goal of rapid and accurate inspection of the swirl slots of fuel nozzles in aero engine, measuring and calculating methods of the depth, width and swirl angle of the swirl slot are proposed which guide the design and establishment of a non-contact precision measuring system for swirl slots. In the measuring system, the horizontal boring structure with mobile column is adopted and its motion mechanism is composed of three linear axes denoted as X, Yand Z, as well as a rotatory axis denoted as A. As for the electrical control module, it is realized by the master-slave control mode of two levels, which is based on the combination of industrial computer and special programmable multi-axis controller. Also, a new optical conoscopic holography sensor is used as the front detector and a calibrationfree fixture of high precision is applied to realize the installation and location of the measured nozzles. Finally, a fuel nozzle is selected as the target and its swirl slot features are measured several times on the system, in which the depth, width and swirl angle are all derived through calculation. As the experimental results show, the repeatability accuracy of the system could meet the inspecting requirements of this kind of fuel nozzles.

A Design of Image Telemetry System based on Tethered Drone

WANG Yang；SHEN Li；ZHOU Shu-yong

2019, 39(4):  73-78.  doi:10.12060/j.issn.1000-7202.2019.04.15

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For the monitoring needs of marine ship decks,This paper proposes a design of image telemetry system based on tethered drone.The image is collected,compressed,encoded,modulated and amplified in real time by the telemetry device on the drone,and then radiated by the antenna.The telemetry receivers,which are tens of kilometers away,finally receive,demodulate,decode,and display images in real time.The article describes the software and hardware components of the system,Key equipment design method,Comprehensive performance analysis.It has certain reference value for the application of related technologies.

Research on Gas Detection Technology Based on TDLAS

LI Wei；JIA Jun-wei；CHAI Hao；ZHANG Shu-feng；ZHANG Ming-zhi；CUI Hong-fei；LIU Jing-min；LIU Zhan

2019, 39(4):  79-84.  doi:10.12060/j.issn.1000-7202.2019.04.16

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TDLAS technology has become one of the important development directions of gas concentration on-line detection technology because of its noncontact, high sensitivity and fast on-line response. Determining the molecular absorption line shape function is the prerequisite for applying this technology. However, there is no effective method for on-line measurement of molecular absorption line shape function, which seriously affects the measurement accuracy of TDLAS technology and limits its application. Therefore, studies the relationship between the characteristic parameters and the molecular absorption line shape function in TDLAS technology through the theory of absorption spectrum and wavelength modulation, and deduces the expression of harmonic terms containing molecular absorption information, eliminating the effects of the background signal, laser intensity, and modulation index according to the relationships between the harmonic signals, and finally establishing the measurement algorithm of absolute absorption intensity based on harmonic signal. The absorption spectral lines of CO₂ molecule and H₂O molecule near 6982cm^-1 is taken as an example for numerical analysis and experimental research, and the simulation and experimental results show that the relative error between the theoretical absorption spectrum and the measured molecular absorption spectrum according to the algorithm is less than 5%, which further improves the measurement accuracy of TDLAS technology and broadens its application range.

Pipeline Defect Method for Oil and Gas Gathering Pipeline Based on RFFC Testing

SHI Ming-jiang；WEN Hao

2019, 39(4):  85-88.  doi:10.12060/j.issn.1000-7202.2019.04.17

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As oil and natural gas contain a lot of corrosive components during gathering process, they will cause corrosion, such as perforation and grooves, etc., so as to ensure the safety of gathering pipelines, it is necessary to detect corrosion defects. Based on the remote-field eddy current detection principle, the remote-field eddy current simulation model based on the gathering pipeline is established. Through the analysis of the influence of the pipeline defect on the amplitude and phase of the magnetic induction axial component, the ralationship of the depth of the inner wall defect and the corresponding detection signal is obtained. The relationship solves the quantitative measurement of the depth of the defect.

Method About Measuring Infrared Radiation of UAV

LV Xiao-lin

2019, 39(4):  89-92.  doi:10.12060/j.issn.1000-7202.2019.04.18

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The infrared radiation is affected by many factor and measuring precision is lower than the experiment require.The infrared radiation can be anti-calculated by indoor demarcating and outdoor testing. The infrared radiation of UAV can be got by estimating atmosphere transmission with FasCode software and revising the testing result. The measuring result is in accordance with the reality and the measuring method is effective.

An Error-free Algorithm Analysis on Sinusoidal Pressure Signal Amplitude in Dynamic Calibration

TAI Han-song；ZHANG Da-you

2019, 39(4):  93-98.  doi:10.12060/j.issn.1000-7202.2019.04.19

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The comparison method is usually applied in sinusoidal pressure dynamic calibration, which completes the amplitude calibration by comparing the response of standard sensor with the sensor to be calibrated under the same standard sinusoidal pressure source. By analyzing the data processing of the amplitude of sinusoidal pressure signal, a new algorithm with no systematical error is provided by setting the sampling frequency equal to positive integer times of the signal frequency. With theory analysis and simulation tests，This algorithm has been proved that accuracy of amplitude calibration can be effectively increased.