Control algorithm for the petal-shape segmented-mirror telescope with 18 mirrors

2012 ◽  
Author(s):  
Atsushi Shimono ◽  
Fumihide Iwamuro ◽  
Mikio Kurita ◽  
Yuki Moritani ◽  
Masaru Kino ◽  
...  
Keyword(s):  
Control Algorithm ◽  
Petal Shape ◽  
Segmented Mirror ◽  
Mirror Telescope

Industrial Verification of Piezo Motors on a CubeSat Based Verification Platform

2006 ◽  
Author(s):  
Manuel Czech ◽  
Ulrich Walter
Keyword(s):  
Complex Systems ◽  
Low Complexity ◽  
Micro Electro Mechanical System ◽  
Mission Design ◽  
Technology Readiness ◽  
Key Technology ◽  
Mems Technology ◽  
Segmented Mirror ◽  
Mirror Telescope

Due to the classification of technologies in NASA’s and ESA’s technology readiness levels, newly developed components have to be space proven before they can be utilized in space missions. This space prove can be adduced by sending these technologies to orbit either as experiment on a piggyback flight or a dedicated mission. Over the last years the size of technologies and satellites has shifted to much smaller sizes. In this paper, the possibility of industrial verification of MEMS (Micro Electro Mechanical System) applications using dedicated pico-satellite missions is examined. Based on the CubeSat concept, a technology verification platform can be realized for verification of not only pico-satellite components, but also of components of complex systems and missions. Therefore a platform fulfilling the requirements for such industrial verification of components named MOVE (Munich Orbital Verification Experiment) is developed at the Institute of Astronautics (LRT). This platform enables professional verification of MEMS technology and techniques at overall mission costs of less than 100k€. As a first application of this approach, a mission called π-MOVE (π for piezo) will verify piezo motors on the developed platform. These piezo motors are representative for components of complex systems, as this motor concept is considered to be key technology for future segmented mirror telescope missions. In the mission design process for this platform, strong emphasis is put on the robustness of the design, low complexity and realizability within the institute’s environment. The advantages through access to both university and industry resources will be taken. The feasibility of professional technology verification is highly dependent on the test plans, which are developed in cooperation with the experienced industrial partners.

Design, development, and validation of a segment support actuator for the prototype segmented mirror telescope

2018 ◽  
Vol 4 (01) ◽  
pp. 1
Author(s):  
Prasanna Gajanan Deshmukh ◽  
Amaresh Mandal ◽  
Padmakar S. Parihar ◽  
Dayananda Nayak ◽  
Deepta Sundar Mishra
Keyword(s):  
Design Development ◽  
Segmented Mirror ◽  
Development And Validation ◽  
Mirror Telescope

The Seimei telescope project and technical developments

2020 ◽  
Vol 72 (3) ◽  
Author(s):  
Mikio Kurita ◽  
Masaru Kino ◽  
Fumihide Iwamuro ◽  
Kouji Ohta ◽  
Daisaku Nogami ◽  
...  
Keyword(s):  
Astronomical Observatory ◽  
Light Weight ◽  
Primary Mirror ◽  
Infrared Telescope ◽  
Technical Developments ◽  
Homologous Structure ◽  
Segmented Mirror ◽  
Okayama Prefecture ◽  
Remaining Time ◽  
Mirror Telescope

ABSTRACT An overview of the Seimei telescope, a 3.8 m optical infrared telescope located on Mt. Chikurinji in the Okayama prefecture of Japan, is presented. Seimei is a segmented-mirror telescope whose primary mirror consists of 18 petal-shaped segments. The telescope tube supporting the thin segmented mirrors is structurally incorporated within large arc-rails providing the elevation axis. The tube has a light-weight homologous structure designed with a genetic algorithm. The total weight of the telescope tube, including 1.4-ton optics, is only 8 tons. By virtue of its light weight, the telescope is able to point at an object anywhere in the observable sky within one minute. The telescope is operated by Kyoto University in collaboration with the National Astronomical Observatory of Japan (NAOJ). Half of the telescope time is used by Kyoto University. The remaining time is open to the Japanese astronomical community. NAOJ is responsible for the management of the open-use time, including handling of the observation proposals. The telescope is now regularly performing scientific observations on the basis of a variety of proposals.

Active disturbance rejection control of position actuator system for segmented mirror telescope

2019 ◽  
Vol 48 (2) ◽  
pp. 218005
Author(s):  
李 浩 Li Hao ◽  
张振超 Zhang Zhenchao ◽  
李国平 Li Guoping ◽  
杜福嘉 Du Fujia ◽  
张 惠 Zhang Hui
Keyword(s):  
Disturbance Rejection ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Actuator System ◽  
Segmented Mirror ◽  
Mirror Telescope
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