Dynamic characterization of a prototype of the Thirty Meter Telescope primary segment assembly

Martin W. Regehr; Peter M. Thompson; M. Mark Colavita; James D. Moore; Mark Sirota; Eric C. Williams

doi:10.1117/12.858155

5 August 2010 Dynamic characterization of a prototype of the Thirty Meter Telescope primary segment assembly

Martin W. Regehr, Peter M. Thompson, M. Mark Colavita, James D. Moore, Mark Sirota, Eric C. Williams

Proceedings Volume 7733, Ground-based and Airborne Telescopes III; 77332G (2010) https://doi.org/10.1117/12.858155
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Finite element models (FEMs) are being used extensively in the design of the Thirty Meter Telescope (TMT). One such use is in the design and analysis of the Primary Segment Assembly (PSA). Each PSA supports one primary mirror segment on the mirror cell, as well as three actuators, which are used to control three degrees of freedom - tip, tilt, and piston - of the mirror segment. The dynamic response of the PSA is important for two reasons: it affects the response of the mirror to fluctuating wind forces, and high-Q modes limit the bandwidth of the control loops which drive the actuators, and impact vibration transmissivity, thereby degrading image quality. We have completed a series of tests on a prototype PSA, in which the dynamic response was tested. We report on the test methods used to measure the dynamic response of the PSA alone and with candidate actuators installed, and we present comparisons between the measured response and FEM predictions. There is good agreement between FEM predictions and measured response over the frequency range within which the dynamic response is critical to control system design.

Citation Download Citation

Martin W. Regehr, Peter M. Thompson, M. Mark Colavita, James D. Moore, Mark Sirota, and Eric C. Williams "Dynamic characterization of a prototype of the Thirty Meter Telescope primary segment assembly", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332G (5 August 2010); https://doi.org/10.1117/12.858155

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available