Saturday, October 29, 2011
Hall 1-2 (San Jose Convention Center)
Today, thousands of scientists observe the night sky to try to better understand the universe. Scientists need high-performance telescopes to collect cutting-edge visible-light data via smaller refection mirror. The University of Hawaii’s Institute for Astronomy (UH IfA) is proposes to build an optical telescope with a primary mirror 1.85-m in diameter. The objective of this project is to design a mechanical support system for telescope mirror that would prevent mirror deflection greater than 100nm during the normal operation. First used GUI-PLOP (finite element analysis software package designed specifically for telescope-mirror analysis) to determine the number of support points that could be needed. Next, we created a realistic 3D computer model of the mirror and use finite element analysis (FEA) software to simulate the mirror’s deformation in its horizontal position. We iterated this model to determine the best location for each support point that minimizes mirror deformation. Once the support structure design is complete, we will test mirror deflection at a variety of tilt angles (from zenith to horizon). Also, to prevent the primary mirror from sliding as it tilts, we will add a “sling” support (a rubber or metal strap around the edge of the mirror) to the model. The final model will be successful if it permits full movement of the primary mirror without exceeding its allowed deformation tolerance. If time permits, we will investigate additional designs that reduce the total number of support points, to minimize both cost and complexity.