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Proceedings Paper

Optimal structural design of the Airborne Infrared Imager
Author(s): Keith B. Doyle; Vincent J. Cerrati; Steven E. Forman; John A. Sultana
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Paper Abstract

The airborne infrared imager (AIRI) is a dual-band IR sensor designed to study air defense issues while wing mounted in a pod. The sensor consists of an optical bench attached to a two- axis inertially stabilized gimbal structure in elevation and azimuth. The gimbal assembly operates within an 18-inch diameter globe while meeting strict pointing and tracking requirements. Design conditions for the assembly include operational and nonoperational inertial, thermal, and dynamic loads. Primary design efforts centered on limiting the line-of- sight jitter of the optical system to 50 (mu) rad under the operating environment. An MSC/NASTRAN finite element model was developed for structural response predictions and correlated to experimental data. Design changes were aided by MSC/NASTRAN's optimization routine with the goal of maximizing the fundamental frequency of the gimbal assembly. The final structural design resultsed in a first natural frequency of 79 Hz using a titanium azimuthal gimbal, a stainless steel elevation gimbal, and an aluminum optical bench which met the design and performance requirements.

Paper Details

Date Published: 6 September 1995
PDF: 12 pages
Proc. SPIE 2542, Optomechanical and Precision Instrument Design, (6 September 1995); doi: 10.1117/12.218659
Show Author Affiliations
Keith B. Doyle, MIT Lincoln Lab. (United States)
Vincent J. Cerrati, MIT Lincoln Lab. (United States)
Steven E. Forman, MIT Lincoln Lab. (United States)
John A. Sultana, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 2542:
Optomechanical and Precision Instrument Design
Alson E. Hatheway, Editor(s)

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