W.M. Keck II Telescope

Overview

Dynamic Structures was responsible for detailing, designing, manufacturing, and constructing the world's largest optical telescope.

For more information on KECK-II see http://www2.keck.hawaii.edu/

Challenge

The twin Keck 10-meter telescopes are presently the largest ground-based telescopes in the world. The telescope structure, optical modules and segmented mirrors demanded design solutions and manufacturing precision that pushed many frontiers. Our challenge was to work with astronomers, scientists and engineers to find the best-engineered solution. In addition, due to the high elevation at the summit of Mauna Kea , workers powers of reasoning and physical ability are seriously affected when working at this high altitude.

Solution

Working with an existing structural solution, we developed new detail solutions for structural connections aimed at minimizing joint eccentricity. One of the most critical telescope components is the mirror cell, a space frame structure made up of over 500 individual members. This structure was manufactured in modules and assembled in the inverted position. Superposition of the nodes during assembly ensured that once the structure was mounted, with all actuators and mirrors in place within the telescope, structural deflection was within one millimetre. Before shipment to site, the entire telescope was assembled and tested for compliance. The azimuth journal, the precision steel rail that the telescope rotates on, was manufactured in segments and shipped to the site for final welding. Special joints were designed to minimize welding distortion and control surface accuracy. With welding completion, custom designed grinding equipment feathered the joints to micron accuracy. To deal with construction at this high altitude, unique erection aids coupled with a detailed operational plan were fundamental to allowing this project to be on time and within budget.

Outcome

The Keck telescopes continue to be the world's leading edge telescopes. Many incredible astronomical discoveries have been made possible through the use of these twin telescopes. They are high precision instruments that demanded the very best in creative thinking in all aspects of design and construction. Attention to detail and the development of the overall plan proved to be invaluable.

Why Dynamic Structures

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Taking Challenges Head On

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