Access Restriction

Author Homin Jiang ♦ Ming-Tang Chen ♦ Han, J.C.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2010
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Other branches of engineering
Subject Keyword Mirrors ♦ Field programmable gate arrays ♦ Mathematical model ♦ Switches ♦ Transfer functions ♦ Voltage control
Abstract The control of a 75 centimeter diameter Atacama Large Millimeter/submillimeter Array (ALMA) [1] nutating subreflector, or Nutator, to meet the specifications of 10 millisecond (ms) settle time and 1.3 arc-second pointing error involves tremendous challenges. The ALMA Nutator has been under development since 2003 [2], and we have improved its dynamic characteristics through robust PID control algorithm, increasing the open loop bandwidth to beyond 200Hz and shortening the settle time to 20 ms. A mode switching associate with model following control scheme is also presented, and expected to improve the settle time and pointing error.
Description Author affiliation: Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei, 106, Taiwan (Homin Jiang; Ming-Tang Chen; Han, J.C.)
ISBN 9781424453627
ISSN 10851992
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2010-09-08
Publisher Place Japan
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 341.76 kB
Page Count 5
Starting Page 962
Ending Page 966

Source: IEEE Xplore Digital Library