NDLI: Control techniques or a large segmented reflector

Content Provider	IEEE Xplore Digital Library
Author	Li, K. Kosmatopoulos, E.B. Ioannou, P.A. Boussalis, H. Mirmirani, M. Chassiakos, A.
Copyright Year	1998
Description	Author affiliation: Dept. of Electr. Eng. Syst., Univ. of Southern California, Los Angeles, CA, USA (Li, K.)
Abstract	The performance of astronomical systems is directly related to the size of their reflectors. Since it is very difficult to cast mirrors larger than 7 meters in diameter from a single piece of glass, to reach unprecedented performance levels, it is planned to construct future optical systems with diameters in the 7-12 meters range from arrays of mirror segments. The problem with segmented optics is to make them behave like the conventional ones made from a single piece of glass. No support structure can provide the mechanical rigidity needed to maintain the position of the mirror segments to such an accuracy. To compensate for the mechanical imperfections, the deformations due to the gravity and thermal loads and to attenuate the seismic or maneuver induced vibrations, the mirror segments must therefore be actively controlled. To study the complex dynamic behavior of large segmented optical systems, NASA has founded a five year project to design and construct a test-bed in the Controls and Structures Laboratory (CSRL) at the California State University, Los Angeles. The CSRL test-bed will serve as a generic experimental facility capable of performing experiments that simulate the complex dynamic behavior of a large segmented optical system. It will be used as an experimental facility for addressing in an integrated way, problems associated with structural dynamics, control of multi-input multi-output systems, optics, electronics, actuators, and sensor design. We describe our latest results regarding robust control, decentralized control, adaptive control and neural network control of the CSRL structure.
Starting Page	813
Ending Page	818
File Size	596514
Page Count	6
File Format	PDF
ISBN	0780343948
ISSN	01912216
DOI	10.1109/CDC.1998.760789
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-12-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical sensors Optical attenuators Mirrors Glass Optical arrays Optical design System testing Optical control Control systems Optical computing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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