High-accuracy electrohydraulic control system for the position and orientation of the primary mirror for a large telescope

2021 ◽  
Vol 79 (7) ◽  
pp. 683-695
Author(s):  
Yu-Xia Li ◽  
Jian-Li Wang ◽  
Peng-Fei Guo ◽  
Hong-Wen Li ◽  
Yu-Yan Cao
Keyword(s):  
Control System ◽  
High Accuracy ◽  
Large Telescope ◽  
Primary Mirror ◽  
Position And Orientation

A Novel Vertical Lift Machine and its Precise Pose Control

2014 ◽  
Vol 989-994 ◽  
pp. 3105-3109
Author(s):  
Xiao Bo Liu ◽  
Xiao Feng Wei ◽  
Xiao Dong Yuan ◽  
Wei Ni
Keyword(s):  
Control System ◽  
Theoretical Analysis ◽  
Control Method ◽  
High Accuracy ◽  
Inverse Kinematic ◽  
Design Model ◽  
Pose Control ◽  
Vertical Lift ◽  
Position And Orientation ◽  
Control Principle

This paper deals with the design and theoretical analysis on a novel vertical lift machine which can vertically lift above 700 kg load up to 3.2 meters above the floor and located the load with high accuracy of position and orientation. Firstly the design model based on the installment demands of line-replaceable units (LRUs) is constructed. Then theoretical analysis including the number of degree of freedom of the lift machine, the inverse kinematic, the control principle, the lift platform pose error and the precise pose control method are conducted in the article. The validity of the design model and the effectiveness of the precise pose control system are confirmed by experiments using a prototype lift machine.

Design of Primary-Mirror Position Control System in Large Telescope

2020 ◽  
Vol 40 (22) ◽  
pp. 2212002
Author(s):  
郭鹏飞 Guo Pengfei ◽  
李玉霞 Li Yuxia ◽  
李剑锋 Li Jianfeng ◽  
张斌 Zhang Bin ◽  
吴小霞 Wu Xiaoxia
Keyword(s):  
Control System ◽  
Position Control ◽  
Large Telescope ◽  
Primary Mirror ◽  
Position Control System

Control for Robots With Braking Actuators in a Uniform Force Field

2015 ◽  
Author(s):  
Erlend Framstad ◽  
Mark D. Bedillion
Keyword(s):  
Force Field ◽  
Control Strategy ◽  
Coulomb Friction ◽  
Energy Equation ◽  
High Accuracy ◽  
Friction Model ◽  
Second Law ◽  
Inclined Plane ◽  
Position And Orientation ◽  
Coulomb Friction Model

This paper concerns the control strategy of a robot with controllable brakes placed in a uniform force field. Without loss of generality this force field is assumed to be gravity, and the robot to be an object resting on an inclined plane. The controller’s objective is then to use the brakes to lead the robot into a desired position and orientation. The system’s dynamics were derived from Newton’s second law with a Coulomb friction model. The controller was derived from geometric properties and the energy equation. The controller was then tested using Matlab and Simulink on the dynamics that were derived. The results of the simulation shows high accuracy even with some disturbances, and uncalibrated parameters.

Overview of AC servo control system for the large telescope

2015 ◽  
Vol 8 (6) ◽  
pp. 895-908
Author(s):  
邓永停 DENG Yong-ting ◽  
李洪文 LI Hong-wen ◽  
王建立 WANG Jian-li
Keyword(s):  
Control System ◽  
Servo Control ◽  
Large Telescope ◽  
Ac Servo ◽  
Servo Control System
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