Table of Content

25 April 2022, Volume 42 Issue 2

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A Method of Inertial Attitude Measuring Device Calibration

XIAOXiao-ping, LIYong-gang, HEXu-long, ZHAOGong-wei, DONGYao-guo, ZHANGJun-jie

2022, 42(2):  1.  doi:10.12060/j.issn.1000-7202.2022.02.01

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Based on the principle and composition of inertial attitude measuring device，the attitude angles of the device are transferred to the working face of the cubic mirror. The calibration methods, which are used to calibrate three-dimensional attitude angles, are brought forward. The working faces of the cubic mirror are measured by the electronic theodolites. Base on the definition of the attitude angles, the angles are converted. The calibration of inertial attitude measuring device is realized. The experimentation, which aim at the inertial attitude measuring device, is put forward. The feasibility of these calibration methods is demonstrated by experimental cases. Finally, the measurement uncertainties are evaluated in the calibration methods.

Present Situation Analysis of Dynamic Pressure Calibration

TIANJun-hong, ZHANGDa-you, DAIYi-lin, ZHAOYun-tao, HUORui-dong

2022, 42(2):  9-14.  doi:10.12060/j.issn.1000-7202.2022.02.02

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Dynamic pressure calibration technology is the key to ensure the accuracy, reliability and uniformity of the pressure test data of aerospace models. The necessity and particularity of dynamic pressure calibration are expounded. The research status of dynamic pressure calibration technology at home and abroad is summarized systematically from three aspects: step pressure calibration method, periodic pressure calibration method and pulse pressure calibration method. The existing problems at present are pointed out and the improvement measures for the future development of dynamic pressure calibration technology are put forward.The measures suggested that laser interference technology should be applied to dynamic pressure calibration，and the nation standard of dynamic pressure should be established，which consists of step pressure calibration device，sinusoidal pressure calibration device and pulse pressure calibration device.

Effect of Calibration Pulse Width on Calibration Result of ImpactSensor

FANGYuan-yong, WUJian, YANGKe-xin, LUODan, DAIYi-lin

2022, 42(2):  15.  doi:10.12060/j.issn.1000-7202.2022.02.03

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Different pulse widths produce different results in the process of calibrating the piezoelectric shock sensor. The main reason is that the pulse width impact frequency is in the amplification area of the frequency response of the sensor installation. Different pulse widths have different amplification effects after acting on the sensor, resulting in different calibration results. The shock sensor is calibrated separately by air gun and Hopkins rod, and the difference between the calibration results is analyzed. The qualitative analysis of the progressivity of the frequency response curve of the sensor installation is consistent with the fact that the difference of impulse pulse width leads to different calibration results. The specific measures for the fixed pulse width control in the calibration process are put forward, which has guiding significance for the correct calibration of the shock sensor.

Airborne Spectrometer Stripping Coefficient Correction Method Research on Movable Radioactivity Pads

GAOGuo-lin, GUANShao-bin, TANGXiao-chuan, HUMing-kao

2022, 42(2):  21.  doi:10.12060/j.issn.1000-7202.2022.02.04

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In order to solve the key problem of unifying the calibration results between the movable pads and the existing large-scale aviation pads, firstly, based on the existing calibration methods, the calibration method of airborne / vehicle γ ray spectrometer by movable pads is established; Then, the a set of tests are carried out to calibrate varieties of γ ray spectrometers carried by helicopter, fixed wing or vehicle by the specially developed movable pads, which proved the movable pads calibration results meet the basic requirements of the national measurement standard, and it calibrate airborne / vehicle γ ray spectrometer is feasible. On the basis of further summarizing the variation law of stripping coefficient with the placement distance of the pad, the stripping coefficient of the calibration results should be corrected is proposed when airborne γ ray spectrometer is being calibrated by movable pads, the indication error of the obtained results are smaller than which on large fixed pads, and the corrected stripping coefficient is closer to the calibration results of the existing fixed pad. The correction method and correction factor of the calibration results of the movable pads are given.

Research on Movement Pose Measurement Technology in the Process of Fairing Separation

YUAN Yuan, GAO Yue, SUN Zeng-yu, WANG Xing, LIU Ke

2022, 42(2):  28.  doi:10.12060/j.issn.1000-7202.2022.02.05

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From the research on the three-dimensional pose tracking measurement of the space target during the separation process of the fairing, a binocular vision system is designed to complete the three-dimensional coordinate measurement of the key points of the fairing. Based on the image processing, recognition and tracking algorithms of each feature point combined with epipolar constraint matching, the precise stereo matching of target points can be realized, and the three-dimensional coordinate calculation of different target feature points can be completed, and the key information such as speed and acceleration of different moving positions can be obtained. The algorithms can provide necessary reference for the mechanical design and dynamics design of the fairing.

Measurement System of Surface Topography Based on Laser Displacement Sensor

WANG Ming-hua, WANG Yong-jun, LV Jia-yang, HUANG Xia, WANG Ming-tao, ZENG Yuan-song

2022, 42(2):  33.  doi:10.12060/j.issn.1000-7202.2022.02.06

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In order to achieve accurate and non-destructive measurement of the surface topography of an object, a surface topography measurement system using a laser displacement sensor is designed. The system consists of a hardware part and a software part. The hardware part includes a laser displacement sensor, a grating displacement platform, and a PCL833 3-axis quadrature encoder and counter card, the software part includes data acquisition software and MATLAB data processing program. The measured object moves according to a certain path on the grating displacement platform. The data acquisition software stores the coordinate data of the discrete points in the X，Y，Z direction. Finally, the three-dimensional morphology of the measured object is achieved by gaussian filtering using the MATLAB program.

A Method for Measuring Mirror Normal Direction Based on Oblique Observation

YANG Zai-hua, WANG Zi-wen, PAN Lu-lu, SUN Wei

2022, 42(2):  39.  doi:10.12060/j.issn.1000-7202.2022.02.07

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Aiming at the situation that the collimating light path is blocked when measuring the normal direction of plane mirror and cubic mirror on spacecraft, an oblique observation method is proposed. This method is to set two theodolites at symmetrical positions on both sides of the mirror normal, so that the two theodolites can observe each other’s light, so as to finally obtain the mirror normal direction. Firstly, the measurement object is described, and then the measurement method based on mirror normal collimation and oblique observation are described in detail. Finally, the measurement comparison test is carried out according to the two measurement methods, and the observation data of theodolites and calculation results are given. Through several experimental data statistics, the difference between oblique observation results and collimation measurement results is in the order of angular seconds, which meets the requirements of Spacecraft test requirements, and can effectively solve the problem of mirror normal direction measurement when the collimation direction of reference mirror on spacecraft is blocked.

Measurement Error Analysis of Horizontal Angle for Photoelectric Autocollimatic Theodolite

LI Yong-gang, JIANG Su-yang, FENG Wei-li, LIU Yan, WANG Zhan-tao, WANG Lei

2022, 42(2):  43.  doi:10.12060/j.issn.1000-7202.2022.02.08

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Aiming at the horizontal angle measuring principle and system composition of photoelectric autocollimatic theodolite. The measuring error components，which effect measurement accuracy of the horizontal angle, are analyzed comprehensively and calculated quantitatively. The compensation methods are put forward for system errors. By the analyzing and compensating these errors, the measurement accuracy of the photoelectric autocollimatic theodolite horizontal angle is improved to 0.5″, which meet the accuracy requirements of level Ⅰelectronic theodolite.

Research on DC compensation demodulation technology for optical fiber F-P sound pressure sensor

HUANG Le-ran, WANG Wei , WANG Zhen , DONG Xi-lai , LIU Bin

2022, 42(2):  50.  doi:10.12060/j.issn.1000-7202.2022.02.09

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A modified dual-cavity DC compensation technique is proposed to demodulate the Extrinsic Fabry-Perot interference (EFPI) fiber sensors, in order to eliminate the requirement of matching between the cavities’ difference and the light’s wavelength. Two quadrature phase-shifted signals could be obtained from the original signals with arbitrary phase difference by eliminating the direct-current component and calibrating the signals’ phases. Detailed theoretical simulation is carried out. EFPI sensors with different cavity length differences are fabricated, and the proposed method is verified by experiments. The results show that this method does not need to keep the initial phase difference constant when demodulating the dual F-P cavity EFPI sensor, is insensitive to the cavity length drift, and has good stability and practical value.

A Structure Design and Strength Analysis for Integrated Bracket of Missile Cabins

LIU Peng, FANG Ze-ping, YU He, WANG Xiao-peng, CHENG Lei

2022, 42(2):  55.  doi:10.12060/j.issn.1000-7202.2022.02.10

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In order to satisfy the demand of the quick replacement of instruments , an integrated structure of replaceable bracket in the missile cabins is proposed, considering the interface design、lightweight design、safety design、man-machine engineering techniques. The experimental results are basically consistent with the simulation data. Consequently, the difficulties of narrow operating space and weakened strength of large windows is overcomed through the integrated bracket, and the efficiency of instrument replacement is improved, which has a good guidance for subsequent missile structure design.

Research on Optimal Layout Method of Complex Separate Measurement Point

WANG Jing-long , QIANG Wei , PAN Zhao-yi , ZHANG Quan-ming , XU Yi-fan

2022, 42(2):  61.  doi:10.12060/j.issn.1000-7202.2022.02.11

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With ever-increasing demands for the development of modern industries, it also takes higher requirement for processing accuracy detection in large and medium sized industrial components. When a certain type of engine is measured, which has been relatively sophisticated in structures and larger in size, due to the special working environment, it is necessary to avoid laying cooperation marks on to-be-measured objects as much as possible. Thus practical researches need to be undertook upon this requirement, like return light test is carried out for cooperation marks and various types of setting complex distribution measuring points are designed. It is suggested in the test that measurement accuracy could be enormously improved by the way of adding measuring auxiliary surfaces, as the accuracy is not affected by decreasing half of the measuring points on measured objects. Lastly, the researches of the setting angles of measuring auxiliary surfaces and columnar-like measured objects are taken.

Application of Temperature Measurement Technology in Health Management of Aero Engine Test Bed

ZHENG Zhi-qing, YU Peng, PANG Li, DUAN Wen-ling

2022, 42(2):  72.  doi:10.12060/j.issn.1000-7202.2022.02.13

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The traditional off-line calibration method of temperature configuration parameters of aero-engine test stand was analyzed. In view of its shortcomings such as time-consuming and frequent disassembly, failure and lack of judgment method of system comprehensive error, the online calibration method of engine test stand under static state was studied. By providing standard heat source for calibrated parameter sensor, the on-line calibration of temperature sensor and temperature channel (temperature instrument) is carried out. By comparing the results of simulation instrument of engine test stand system with the readings of standard, the effectiveness of on-line calibration is confirmed, and the comprehensive error calibration of test stand system is realized, which provides support for the health management of test stand.

An Underwater Gravity-aided Navigation Method Considering the Eötvös Effect

Guang-jun Zhang , Meng-de Zhang , Zhong-xia Zhang , Duan-yang Gao

2022, 42(2):  77.  doi:10.12060/j.issn.1000-7202.2022.02.14

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Compared with the surface of the water, it is more difficult to accurately estimate the E?tv?s effect in underwater, which affects the accuracy of gravity measurement. The traditional gravity matching algorithm does not consider the impact of E?tv?s estimation error on the performance of gravity aided navigation. According to investigating the degree of influence of different navigation parameters on E?tv?s estimation error, establishes inertial navigation system (INS), Doppler velocity log (DVL) and gravimeter underwater navigation framework based on unscented Kalman filtering (UKF). The performance of gravity aided navigation with or without E?tv?s estimation error is evaluated. Semi-physical simulation results show that the DVL underwater aided navigation method can restrain the accumulation of INS errors to a certain extent. The positioning performance of the INS/DVL/Gravimeter navigation mode is further improved. Even when the E?tv?s estimation error is considered, the horizontal radial positioning accuracy is still improved by 17.02% compared with only using DVL as the aided information.

Study of Working Mode and Control Strategy of Buck-Boost Converter

ZHANG-Ting, LIU Ya-qiang, WANG Zu-liang, ZHANG Shan-wen

2022, 42(2):  85.  doi:10.12060/j.issn.1000-7202.2022.02.15

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DC-DC converter is an important equipment to realize electric energy conversion and transmission in electrical system. It has the performance of smooth acceleration and fast response. However, in the specific application environment, the load change of converter will have a great impact on its performance. Taking Buck-Boost DC-DC converter as an example, the working process and modes are analyzed, and the corresponding control strategies for complete inductance supply mode (CISM) and incomplete inductance supply mode (IISM) are put forward. The system can automatically judge the load change, realize the rapid adjustment of the output voltage, and make it always stable at the expected voltage. The control strategies under different modes are simulated. The simulation results show that the proposed control strategy can improve the overshoot and regulation time of Buck-Boost DC-DC converter.

Application of Network Community Division Algorithm Based on Laplace Matrix in Cable Network Test

WANG Bing , WEI Zhi-qiang , CAI Wen-jie , YAN Jia-hui , ZHANG li-li , ZHAO Kai

2022, 42(2):  90.  doi:10.12060/j.issn.1000-7202.2022.02.16

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In the low-frequency cable network conduction and insulation test, the division of the connection nodes of the cable network is the basis of the low-frequency cable network test. By dividing the connection nodes of the cable network, the design of the transfer cable and the test plan can be completed efficiently and at low cost, which will greatly save the cycle and cost of the performance test of the cable network, and lay the foundation for the fast, efficient and accurate test of the cable network in the engineering project task. Generally, the test of the cable network directly carries out the design of the transfer cable through the connection relation table. This method has low test efficiency due to the core point distribution of the adapter cable connector. Aiming at the above problems, a network community division algorithm based on Laplacian matrix is proposed to complete the division of sub-networks with high correlation in the cable network. This method solves the problem of dividing the sub-network of the cable network with many nodes and strong correlation. After the simulation verification, the cable network test is performed with the transfer cable designed after the division, and the test efficiency is improved.