Search

Your search keyword '"YU Jian-ding"' showing total 19 results
Start Over Author "YU Jian-ding"
19 results on '"YU Jian-ding"'

1. Control system of electrostatic levitation based on high-speed vision

Author

董文博 Dong Wen-bo, 贺 欢 He Huan, 张东伟 Zhang Dong-wei, 余建定 Yu Jian-ding, 陈东阳 Chen Dong-yang, 梁学锋 Liang Xue-feng, and 郭清远 Guo Qing-yuan

Subjects
Physics, High speed vision, business.industry, Control system, Electrostatic levitation, Aerospace engineering, business, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
Published
2019

3. Analysis of Live Working Safety Distance for 750kV Double Circuit Transmission Line in Different Altitude Areas

Author

Sun Hui, Qing Xie, and Yu Jian Ding

Subjects
Low altitude, Altitude, Correction method, Transmission line, General Engineering, Environmental science, Analysis method, Remote sensing, Test data
Abstract

In order to determine the required live working safety distance for 750kV double circuit transmission line in different altitude areas of China, by using the test data of 750kV double circuit transmission line in the low altitude areas, and combining the common altitude correction methods, the live working safety distances of different altitude correction methods are obtained. By comparing and analyzing the results of different analysis methods, the required minimum approach distances and minimum combined gap distances of live working are recommended under different working conditions in the altitude of 1000m ~ 5000m areas. The results could provide technical reference for 750kV double circuit transmission line in different altitude areas.

Published
2014

4. Acquisition of Time Parameters and Charges in the Streamer Discharge Simulation

Author

Yu Jian Ding, Qing Xie, and Ze Zhang

Subjects
Discharge, General Engineering, Electronic engineering, Environmental science, Mechanics, Streamer discharge, Air gap (plumbing)
Abstract

Because of the dynamic characteristics of the streamer discharge, the acquisition of time parameters is very important to the streamer discharge simulation in the rod-plate air gap. This paper raises a new method to get the time parameters and charge development in the discharge of air gas, and the comparison of our results and the test results shows that the new method is very suitable and correctly to describe the stream discharge process.

Published
2014

5. Lightning Impulse Voltage Correction of Power Transmission and Transformation Project Typical Gap

Author

Fang Cheng Lü, Ying Jie Peng, and Yu Jian Ding

Subjects
Power transmission, Engineering, Correction method, business.industry, Lightning impulse voltage, General Engineering, Electrical engineering, Impulse (physics), business, Air gap (plumbing), Computational physics, Voltage
Abstract

External insulation design of UHV power project is important. The lightning impulse (LI) voltage is one of the main factors that determine the air gap distance. Based on existing LI voltage results of power project typical gap, impact of gap structure and distance on LI discharge correction is analyzed. And from a theoretical aspect, existing LI discharge correction methods are summarized. Furthermore, by the use of common correction methods, LI voltage correction factors of rod - plane were calculated and analyzed. Results show no significant impact of gap type or gap distance on LI voltage correction is found out. Average atmospheric conditions are effective when atmospheric parameters method is used for LI voltage correction. DL/T 620, IEC 60060-1 and IEC 60071-2 can be used for LI voltage correction at areas with altitudes of 1000-5000m. While GB311.3-improvement method can be used for LI voltage correction at areas with altitudes blow 4000m.

Published
2014

11. Control system of brushless DC motor based on neuron PID.

Author

ZHAO Peng-fei, YU Jian-ding, and LUO Guo-qing

Subjects
*AUTOMATIC control of brushless direct current electric motors, *PID controllers, *SERVOMECHANISMS, *BRUSHLESS electric motors, *AUTOMATIC control systems
Abstract

Aiming at servo control of high-performance permanent magnet brushless motor, the physical structure, the mathematical model and the principle of permanent magnet brushless motor were researched. After the introductions of the principle of traditional PID controller and the control system of permanent magnet brushless motor, the defects of brushless motor control system based on traditional PID controller were analyzed and summarized, an intelligent control strategy of permanent magnet brushless motor based on Neuron PID was proposed. Firstly, the characteristics of Neuron PID controller were expounded. Then the algorithm of the Neuron PID control system was designed and implemented, the Neuron PID controller was used in control of speed loop of permanent magnet brushless, utilizing the self-learning ability of Neuron PID, control parameters can be trained and adjusted in real time. At last, simulation of permanent magnet brushless motor control system based on traditional PID and Neuron PID were given with Simulink, both the results of simulation were compared. The results indicate that the system can improve the response of speed and the rotational stability of brushless motor. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

18. Thermal and Optical Properties of High Refractive Index xNb2O5-(1-x)La2O3 Glasses Prepared by Aerodynamic Levitation Method

Author

Cheng, Yu Xing, Xu, Gui Sheng, Yu, Jian Ding, Pan, Xiu Hong, Zhang, Ming Hui, and Liu, Yan

Abstract

Bulk glasses of xNb2O5(1-x)La2O3 (NL) with high refractive index were prepared by aerodynamic levitation method. Only when x ranges from 0.62 to 0.72, NL glasses can be obtained. The effect of compositions on the thermal property and refractive index was investigated. The results indicated that the glass transition temperature ranged from 733 to 767 with the increasing of La2O3 in NL glasses, while the crystallization peak ranged from 811 to 837 . The glasses had high refractive index ranging from 2.26 to 2.31. According to the Drude-Voigt relationship, the Abbe number of the glasses was calculated to be about 20. This type of glass was colorless and transparent in the region from visible to infrared region. Thus, the niobate glass system has promising application in lenses, next-generation optical disk, and endoscopes.

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results