Table of Content

25 April 2019, Volume 39 Issue 2

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Progress and Prospects for the Measurement Research on the Moment of Inertia

WANG Xiao-san；LIU Yun-ping；NI Huai-sheng；ZHANG Ning

2019, 39(2):  1-5.  doi:10.12060/j.issn.1000-7202.2019.02.01

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A review on the measurement research of the moment of inertia is carried out. The principles of some current measurement methods of the moment of inertia, such as the trilinear pendulum method, the torsion pendulum method and the falling body method, are summarized as well as their advantages and disadvantages. A new method aimed at these disadvantages is introduced, which is prospected to be a development direction for the measurement of the moment of inertia.

Application of Electro Leading Edge Measurement Technology in Aerospace Model Service

HUANG Xiao-ding；TONG Ya-zhen；CAI Jian-zhen

2019, 39(2):  6-9.  doi:10.12060/j.issn.1000-7202.2019.02.02

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A series of solution with quantum metrology technique and calculation metrology standard technique have been proposed to solve the problems in space vehicle measurement, such as the aerospace standard stability, linearity of multiform sensor output signal and time delay of electro pulse measurement. The electro quantum measurement accuracy can reach to 10E^-9 magnitude degree of uncertainty. The application of quantum standard can be used to measure resistance standard on space vehicle in short-term, then reckoning longterm behavior, which is important for space vehicle stability controlling. The quantum standard can be used for calibrating sensors in mV level linearity and measuring time delay of pulse measurement in 10^-9s magnitude, which is important for space vehicle electronic propulsion system controlling.

Simulation Analysis of Sine Pressure Generator Based on FLUENT Dynamic Mesh

SU Huai-wei；ZHANG Da-you；MAO Rui-Zhi

2019, 39(2):  10-14.  doi:10.12060/j.issn.1000-7202.2019.02.03

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In order to analyze the variation of the internal flow field during the working process of the sine pressure generator, a simplified three-dimensional model of the internal flow channel of the sine pressure generator was established using UG software, which takes a sine pressure generator with filtering characteristics as the prototype. Dynamic numerical simulation of internal flow field of sinusoidal pressure generator by FLUENT dynamic mesh technology and UDF (user-defined function) method. By changing the frequency of simulation analysis, the pressure of the flow field in the main and sub-sine pressure chambers and the variation of the mass flow rate of the outflow gas at the outlet surface of the pressure chamber are analyzed. The numerical simulation result demonstrates that the method is in good agreement with the actual test results and verifies the correctness and feasibility of the numerical simulation, which provides a reference and approach for the performance prediction and optimization design of the sine pressure generator.

Study of Measurement for High Temperature Spectral Emissivity

ZHANG Jun-qi；PEI Ya-peng；HUANG Ze；WANG Kuo-chuan；ZHAO Hua-ye；LIU Hao

2019, 39(2):  15-19.  doi:10.12060/j.issn.1000-7202.2019.02.04

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Introduced the present condition and the question for facing carried on introduction, clarifies the significance of establishing the high temperature emissivity measurement standard device, introduced the current research situation, and introduced the technical route and design scheme of the standard device.

Design and Comparison of TailSitter Aircraft Gain Scheduling Controller

YANG Shuo；YANG Liu-qing；ZHANG Yong；GUO Jin

2019, 39(2):  20-26.  doi:10.12060/j.issn.1000-7202.2019.02.05

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Based on the analysis of the dynamics model of the tail-sitter aircraft, considering the control effect of the propeller wake on the aircraft, the mathematical model is established, and a tracking angle based on the track is designed for the longitudinal transition of the tailseat aircraft. The variable gain scheduling controller experiences its gain scheduling controller using two feedback control methods, LQR and H_∞, respectively. The slope and multi-step signal are used as instructions to verify the performance of the longitudinal model by means of track angle tracking. The simulation results show that both controllers can ensure the stable transition flight of the aircraft. And the gain scheduling LQR controller has better performance in terms of stability, and the gain scheduling H_∞ controller has greater advantages in terms of speed and accuracy.

Integrated Modeling and Control of Small Hybrid Wing UAV Transient Process

WANG Bo-hao；ZHANG Yong；XU Wei-cheng；GUO Jin

2019, 39(2):  27-31.  doi:10.12060/j.issn.1000-7202.2019.02.06

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The hybrid wing vertical take-off and landing UAV solves the problem that the fixed wing UAVs can not vertical take-off and landing, and the small flight time of the rotor unmanned aerial vehicle (UAV). A hybrid wing combined with a fixed wing can be used for a vertical take-off and landing unmanned aerial vehicle (UAV) system. A six degree of freedom nonlinear dynamic equation is derived from the integration of the rotor and the fixed wing in the transition process. The stability of the longitudinal aerodynamic model is analyzed, and a gain scheduling tracking controller based on LQR (Linear Quadratic Regulator) is designed. The results show that the designed controller can track the UAV state very well.

Study on the Calibration Technology of Electrostatic Charge sensor

LI Xiao-qing；YUAN Ya-fei；YANG Ming；JI Qi-zheng

2019, 39(2):  36-40.  doi:10.12060/j.issn.1000-7202.2019.02.08

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Electrostatic charge sensors are widely used in condition monitoring, fault prediction and health management of precision machinery and aero engines.The calibration technology of electrostatic charge sensor is introduced. Based on the oil droplet charging principle, combined with DC high voltage source, supporting fixture and charge measurement unit, the electrostatic charge sensor calibration system is developed.Through the oil dropping experiment, the relationship between oil charge and applied voltage, oil droplet size, temperature and humidity was obtained. The factors affecting the calibration equipment were analyzed.

The Research of Electricity Visualization Auto-calibrating  Equipment

HAO Zhi-kun；NIE Ji-xin；YANG Jin；ZHANG Zheng-long

2019, 39(2):  41-44.  doi:10.12060/j.issn.1000-7202.2019.02.09

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The principle and devise of the electricity visualization auto-calibrating equipment are introduced.The set is used for calibrating the portable digital multimeter and analog pointer meter without program control interface. The data of measurement is collected by industrial camera. The software is edited by labview. The result shows that the electricity visualization auto-calibrating equipment in this article can meet the demands of the portable digital multimeter and analog pointer meter.

Application of All Phase FFT Frequency Measurement in FMCW Laser Ranging Technology

GUO Tian-mao；LIU Ke；MIAO Yin-xiao；SONG Jin-cheng；GUO Li-zhen；WANG Xiao-guang

2019, 39(2):  45-50.  doi:10.12060/j.issn.1000-7202.2019.02.10

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The Frequency-Modulated-Continuous-Wave laser ranging technology has the highest measurement accuracy in the common non-cooperative target laser ranging technology. The principle is to linearly modulate the optical frequency of the emitted laser. Calculate the distance of the target by measuring the frequency difference between the transmitted signal and the echo signal. Therefore, the accuracy of frequency measurement has a decisive influence on the accuracy of distance measurement. Due to the spectral leakage of the conventional FFT, the measurement accuracy is low, and the spectrum refinement method is fundamentally limited by the accuracy of the FFT. The all-phase FFT solves the problem of spectrum leakage and has the property of phase invariance. In this paper, the all-phase FFT method is applied to the frequency measurement of FMCW laser ranging. The frequency is measured by the time-shift phase difference method. The actual measured data is solved the MATLAB environment to calculate the target distance. Experiment shows that when the full-phase FFT is applied to the frequency modulation laser ranging digital signal processing, the ranging error is less than 0.3mm at a distance greater than 50 m, which achieves a good application effect.

Effects of the Self-stabilization Platform on Azimuth Angle Measurement in Condition of Moving Base

LI Yong-gang；ZHOU Yu-tang；ZHANG Zhong-wu；WANG Zhen；ZHAN Gong-wei

2019, 39(2):  51-56.  doi:10.12060/j.issn.1000-7202.2019.02.11

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The platform is remained horizontal by self-stabilization platform，which the angle variation on the base is sensed by optical electrical sensors. The horizontal benchmark is offered by self-stabilization platform for the measurement instrument. The instrument, which needs the horizontal benchmark, can be used in the moving base surroundings. For example，the theodolite can be used in a ship. But，in the moving base surroundings，using selfstabilization platform as the horizontal benchmark，the theodolite is used to measuring azimuth angle. But, through the analysis of the self-stabilizaing processing, there is a turn angle in azimuth direction between the measuring aim and the stabilized platform. It influences the measuring precision of azimuth angle. Based on the theories of selfstabilization platform，the calculation formula is derived.The main factors, which influence the azimuth angle, are analyzed.The influencing degree of the parameters are respectively expounded. Finally,based on these analysis results, the considerations of measuring the azimuth angle are performed,when self-stabilization platform is used. The methods of avoiding measuring error and the methods of error compensation are discussed.

Research on Measurement Technology Based on Datum Bridging Method for Overrange Position Error

LI Nan；WANG Zhi-hua；WANG Ting

2019, 39(2):  57-61.  doi:10.12060/j.issn.1000-7202.2019.02.12

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A special checking device is chosen as an example to show a method for position error based on CMM using datum bridging principle. Mathematical model for parallelism and perpendicularity is calculated and deduced, and the measurement procedure is introduced. The measurement range and ability are improved. Meanwhile, the uncertainty of measurement results is evaluated, and the bridging method is proved feasible.

Research of Roadmatching Location Method

WANG Chun-xi；WU Yue；JIANG Su-yang；WANG Qiang；JIANG Yun-xiang

2019, 39(2):  62-66.  doi:10.12060/j.issn.1000-7202.2019.02.13

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A new road-matching location method is proposed, to improve the positioning accuracy of vehicle inertial navigation system and solve the problem of positioning accuracy gradually deteriorated due to the error caused by inertia components precision changed with time. The method based on vision measurement theory and is assisted-positioned  by roads surrounding environment which acquisitioned by two cameras. Environmental matching-position theory and key technology are presented, and the method’s correctness and feasibility are verified by long way road position testing.

Research on the Testing Method of Mechanical Properties of Thin Strip with δ0.05mm

XU Qiu-fa；LI Dong-dong；YANG Qing-gong；LI A-ni；LIU Zong-jie；ZHAN Xiao-yan

2019, 39(2):  67-70.  doi:10.12060/j.issn.1000-7202.2019.02.14

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The effect of tensile rate，sample type and surface state on the mechanical properties test of thin strip with δ0.05mm ie studied. The results show that the tensile rate has little influence on the mechanical properties of the thin strip，and sample type and surface state had significant influence on the mechanical properties. Dumbbellshaped sample without defects on the surface could meet the requirements for testing and improved primary the qualification rate of thin strip.

Research on Filter Algorithm for Continuous Liquid Level Measurement of Propellant Utilization System

LI Qiang；HU Yuan-wei；DONG Yu-hong；MA Xiao-long

2019, 39(2):  71-75.  doi:10.12060/j.issn.1000-7202.2019.02.15

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Aiming at the problem of continuous liquid level measurement in cryogenic propellant utilization system, a filtering algorithm based on flow level measurement is proposed. The basic principle of the algorithm is introduced, and mathematical modeling and digital simulation are carried out. Through the analysis of the simulation results, it is proved that the algorithm can effectively solve the measurement error caused by the liquid sloshing in the rocket flight and has certain engineering application value.

Design and Research of Massive Data Storage for the Autonomous Logistics System of Aerocraft

ZENG Fa；MA Yu-xin；LIANG Jun；ZENG Gui-ming；RONG Gang

2019, 39(2):  76-82.  doi:10.12060/j.issn.1000-7202.2019.02.16

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With the expansion of data scale of aerocraft, data storage becomes the core technology. In order to meet the requirement of massive data storage for the Autonomous Logistics System of a certain aerocraft, one data storage system using a fully symmetrical architecture and an improved Hash algorithm is designed by defining virtualized storage through software. Without a single point of failure in the system, the security of data storage can be enhanced extremely, and with symmetrical storage architecture, the capacity can be expanded indefinitely. After the algorithm is improved, the performance of read-write speed and load balancing is also improved significantly.

Discussion on the Development of Aerospace Manufacturing with Advanced Measurement Technology Supporting

PEI Ya-peng；Gao Ya；FENG Zhi-jun

2019, 39(2):  83-86.  doi:10.12060/j.issn.1000-7202.2019.02.17

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Measurement technology is the foundation of supporting the development of aerospace manufacturing. The level of measurement technology is directly related to the quality of aerospace equipment manufacturing. It mainly introduces the significance of measurement technology to the aerospace manufacturing, analyzing the actuality and problem of measurement technology in aerospace equipment manufacturing, advise on development needs combined with aerospace development, exert the effect of measurement technology.