Research on high accuracy, long life, and high reliability technique of control moment gyroscope

Author(s):  
Li Gang ◽  
Wu Dengyun ◽  
Lu Ming ◽  
Lai Lin ◽  
Tian Xing ◽  
...  
2014 ◽  
Vol 526 ◽  
pp. 99-102
Author(s):  
Xue Li ◽  
Wei Cheng

As an actuator of spacecraft attitude control, the large control moment gyroscope (CMG) produces significant output torque and exhibits excellent linearity features for control, anti-disturbance, and rapid response functions. The large CMG is globally preferred for the execution mechanism of long-life spacecraft. This gyroscope is characterized by massive moving parts and distinct natural frequency between working and halting modes. Based on these features, this study measures the natural frequency of the large CMG by using both hammering and CMG startup testing.


2013 ◽  
Vol 46 (19) ◽  
pp. 476-481
Author(s):  
Zhou Daning ◽  
Zhai Baicheng ◽  
Wei Dazhong ◽  
Zhang Jiyang ◽  
Lei Yongjun ◽  
...  

2021 ◽  
Vol 11 (12) ◽  
pp. 5474
Author(s):  
Tuomo Poutanen

This article addresses the process to optimally select safety factors and characteristic values for the Eurocodes. Five amendments to the present codes are proposed: (1) The load factors are fixed, γG = γQ, by making the characteristic load of the variable load changeable, it simplifies the codes and lessens the calculation work. (2) Currently, the characteristic load of the variable load is the same for all variable loads. It creates excess safety and material waste for the variable loads with low variation. This deficiency can be avoided by applying the same amendment as above. (3) Various materials fit with different accuracy in the reliability model. This article explains two options to reduce this difficulty. (4) A method to avoid rounding errors in the safety factors is explained. (5) The current safety factors are usually set by minimizing the reliability indexes regarding the target when the obtained codes include considerable safe and unsafe design cases with the variability ratio (high reliability/low) of about 1.4. The proposed three code models match the target β50 = 3.2 with high accuracy, no unsafe design cases and insignificant safe design cases with the variability ratio 1.07, 1.03 and 1.04.


2019 ◽  
Author(s):  
Burak Akbulut ◽  
Ozan Tekinalp ◽  
Ferhat Arberkli ◽  
Kivanc Azgin

Author(s):  
R.F. Caristi ◽  
J.B. Roy ◽  
R.L. Brooks ◽  
A.J. Pennell
Keyword(s):  

Author(s):  
Wenhao Deng ◽  
Skyler Moore ◽  
Jonathan Bush ◽  
Miles Mabey ◽  
Wenlong Zhang

In recent years, researchers from both academia and industry have worked on connected and automated vehicles and they have made great progress toward bringing them into reality. Compared to automated cars, bicycles are more affordable to daily commuters, as well as more environmentally friendly. When comparing the risk posed by autonomous vehicles to pedestrians and motorists, automated bicycles are much safer than autonomous cars, which also allows potential applications in smart cities, rehabilitation, and exercise. The biggest challenge in automating bicycles is the inherent problem of staying balanced. This paper presents a modified electric bicycle to allow real-time monitoring of the roll angles and motor-assisted steering. Stable and robust steering controllers for bicycle are designed and implemented to achieve self-balance at different forward speeds. Tests at different speeds have been conducted to verify the effectiveness of hardware development and controller design. The preliminary design using a control moment gyroscope (CMG) to achieve self-balancing at lower speeds are also presented in this work. This work can serve as a solid foundation for future study of human-robot interaction and autonomous driving.


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