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Your search keyword '"Ding, Yanwei"' showing total 4 results
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4 results on '"Ding, Yanwei"'

1. Application of inter-laboratory comparison method in thermal analysis techniques.

Author

LIU Lyudan, BAI Yuxia, and DING Yanwei

Subjects
THERMAL analysis, FACTOR analysis, THERMOGRAVIMETRY, CHEMICAL industry
Abstract

Thermal analysis techniques are increasingly widely used in the fields of minerals, metals, petroleum, food, medicine, chemical industry and other materials related fields. Due to the many influencing factors of thermal analysis technology, there is no unified standard material to calibrate the instrument, which makes it difficult for the laboratory to establish the traceability mechanism of measurement results, so that the accuracy of the results can not be grasped. Through inter-laboratory comparison, the detection ability of the laboratory can be effectively determined to ensure the accuracy of the experimental data. In this paper, the implementation of the interlaboratory comparison project of the Chinese Academy of Sciences 'Determination of the thermal decomposition percentage of unknown substances by thermogravimetric method' is taken as an example. By analyzing the statistical results of the comparison data, it is found that the comparison results are in good agreement, and the deviation of the measurement results of each reference laboratory is within the acceptable range, which verifies the applicability and reliability of the inter-laboratory comparison method in thermal analysis techniques. [ABSTRACT FROM AUTHOR]

Published
2023
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3. An On-orbit Calibration Method of KBR Phase Center.

Author

XIN Ning, QIU Lede, ZHANG Lihua, and DING Yanwei

Subjects
*ORBITS (Astronomy), *CALIBRATION, *ARTIFICIAL satellite tracking, *GLOBAL Positioning System, *TECHNOLOGY convergence, *ALGORITHMS
Abstract

An algorithm for on-orbit calibration of K band ranging (KBR) system phase center of the low-low satellite-to-satellite tracking (SST-LL) gravity satellite was proposed. Firstly, the attitude control algorithm was designed according to the calibration maneuver design, and the satellite control procedure was divided into thruster maneuver control procedure and stabilization control procedure. Secondly, the observation of KBR, GPS and star sensor were used to estimate the phase center of KBR based on extended Kalman filter. The pitch and yaw attitude control error are better than 1mrad, and the roll error is better than 3mard which indicates that the calibration attitude stabilization control can be realized. The calibration accuracy of three axises are all better than 1mm, which verify the fast convergence rate and the steady accuracy of the algorithm. [ABSTRACT FROM AUTHOR]

Published
2014
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4. Study on On-orbit Calibration of Center of Mass for Gravity Satellite.

Author

Xin Ning, Qiu Lede, Zhang Lihua, Ding Yanwei, and Wang Dalei

Subjects
*CENTER of mass, *CALIBRATION, *ORBITAL assembly of space vehicles, *KALMAN filtering, *ELECTROSTATIC accelerators, *MAGNETIC torque
Abstract

A method for on-orbit calibration of center of mass for gravity satellite was proposed, based on a predictive filter fusing extended Kalman filter estimation algorithm. Firstly, a periodic magnetic torque which was more larger than other external torques was applied to the satellite. Secondly, the observation of gyro was used to estimate angular acceleration based on the predictive filter. Finally, an extended Kalman filter was used to estimate the satellite's center of mass. The numerical results indicate that the angular acceleration and center of mass can be real time estimated. The calibration accuracy of three axes is [0.0628 0.0324 0.0414]mm, which demonstrates the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]

Published
2013
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