Advances in Research and Development - Heterojunctions for High-Speed and Infrared Applications

1997 ◽  
Keyword(s):  
Research And Development ◽  
High Speed

scholarly journals Optimization of presser foot and needle bar driving mechanism based on the complex method principle

2021 ◽  
Vol 16 ◽  
pp. 155892502110603
Author(s):  
Lei Zhang ◽  
Zhien Zhang ◽  
Jianneng Chen ◽  
Shouzhi Huang ◽  
Yibin Zhai
Keyword(s):  
Research And Development ◽  
High Speed ◽  
Pause Time ◽  
Complex Method ◽  
Driving Mechanism ◽  
Drive Mechanism

The rod presser foot and needle bar driving mechanism of the embroidery machine cannot achieve accurate parking time and position at high speed, which limits the development of high speed embroidery machine and make the quality of embroidery decline. Aiming at solving this bottleneck problem, the characteristics of the embroidery machine presser foot and needle bar driving mechanism based on analyzing the mechanism kinematics is developed. These characteristics and influences of each linkage parameters on the presser foot parking time and position are analyzed. Six main parameters are selected to optimize by using the complex method. Taking the parking position and linkage parameters as constraints, the parameters of the main linkages was optimized in order to obtain the maximum parking time of the presser foot mechanism. The results show that the optimized parameters is more reasonable and effective, the pause time of the presser foot mechanism is increased by 15.5%, and the parking position of the embroidery machine is at 100° ± 0.5° as required by the technological requirements, which satisfies the requirements of the coordinate movement of the needle bar-presser foot drive mechanism of the high-speed embroidery machine. The study also provides a method reference for the follow-up high-speed embroidery machine research and development.

Research and Development of a Test Platform for Synthetic Performance Parameters of Linear Motors

2011 ◽  
Vol 383-390 ◽  
pp. 4486-4491
Author(s):  
Zhong Quan Luan ◽  
Hu Yan Ji ◽  
Qing Dong Yang
Keyword(s):  
Research And Development ◽  
High Precision ◽  
Virtual Instrument ◽  
High Speed ◽  
Linear Motor ◽  
Cnc Machine Tools ◽  
Performance Parameters ◽  
Cnc Machine ◽  
Linear Motors ◽  
Test Platform

Linear Motors have been used more and more widely in high precision and high-speed linear motion for CNC machine tools, but uniform testing standards and methods for linear motor performance have not been established in China. Based on the virtual instrument software platform by means of computer technology, research and development of the test platform for synthetic performance parameters of linear motors can realize the rapid and accurate measurement, automatic storage and processing of linear-motor output, currents, positions, temperatures and other performance parameters. , Meanwhile, the platform can also provide the technical direction for design or improvement of linear motors, and technically support the formulation of related standards. Experiments showed that the test platform for synthetic performance parameters of linear motors can achieve high precision and automatic measurement to meet the testing requirements for synthetic performance of linear motors.

scholarly journals CuBr-усилитель яркости с частотой следования импульсов сверхизлучения/усиления до 200 kHz

2021 ◽  
Vol 47 (17) ◽  
pp. 18
Author(s):  
И.С. Мусоров ◽  
С.Н. Торгаев ◽  
Г.С. Евтушенко
Keyword(s):  
Research And Development ◽  
Active Medium ◽  
High Voltage ◽  
High Speed ◽  
Pulse Repetition Frequency ◽  
Leading Edge ◽  
Input Energy ◽  
Discharge Mode ◽  
Copper Bromide ◽  
Half Height

The paper presents the results of research and development of a high-speed brightness amplifier based on copper bromide vapor active medium, with a pulse repetition frequency of up to 200 kHz. This became possible due to the use of the reduced input energy into the discharge mode (less than 60 µJ / cm3 per pulse), by shortening the leading edge of the high-voltage pump pulse to 20 ns and the duration (at half-height) to 30 ns.

Recent Patents on the Structure of High-Speed Motorized Spindle

2019 ◽  
Vol 12 (2) ◽  
pp. 125-137
Author(s):  
Ye Dai ◽  
Wen-Qiang Wei ◽  
Xue-Liang Zhang ◽  
Yun-Shan Qi
Keyword(s):  
Research And Development ◽  
Machine Tool ◽  
High Precision ◽  
High Speed ◽  
Numerical Control ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Motorized Spindle ◽  
The Core ◽  
Spindle Structure

Background: As one of the core components of high-speed CNC machine tool, high-speed motorized spindle is the core functional component of high precision CNC machine tool, which has become the key research and development object of the world. Objective: By comparing and discussing the patents of high-speed motorized spindle, some valuable conclusions have been drawn to predict the future research and development of high-speed motorized spindle. Methods: By analyzing the characteristics of high-speed motorized spindle structure, the influence of high-speed motorized spindle on high-speed machining technology was explicated. Combining with the key technology of high-speed motorized spindle, the patents related to high-speed motorized spindle structure were used for investigation. Results: With the rapid development of high-speed cutting and numerical control technology and the need of practical application, the requirement for high-speed spindle performance has increased. Motorized spindle technology has the characteristics of high speed, high strength, high power, high torque and low speed, high precision, high reliability and long life, offering diversified bearing and lubrication cooling methods and serving as an intelligent system. Conclusion: The different levels of improvement and renovation of the structure with high-speed motorized spindle, by adding lubrication and cooling device to the spindle have improve the performance of spindle, addressing the loopholes in the technology and making it more practical.

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